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noChildren firstInLevel"><a href='/hst/observing/scheduling' class="offcanvas__section-link" >Scheduling</a></li><li class="offcanvas__item noChildren"><a href='/hst/observing/activating-your-target-of-opportunity' class="offcanvas__section-link" >Activating Your Target of Opportunity</a></li><li class="offcanvas__item noChildren"><a href='/hst/observing/observing-status' class="offcanvas__section-link" >Observing Status</a></li><li class="offcanvas__item noChildren"><a href='/hst/observing/program-information' class="offcanvas__section-link" >Program Information</a></li><li class="offcanvas__item hasChildren lastInLevel"><a href='/hst/observing/post-observation' class="offcanvas__section-link" >Post-Observation</a><button class="offcanvas__section-toggle" id="Post-Observation_11_control" type="button" aria-label="Post-Observation submenu" aria-controls="Post-Observation_11_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Post-Observation_11_section" class="offcanvas__list" data-level="4" aria-labelledby="Post-Observation_11_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/observing/post-observation/data-analysis-toolbox' class="offcanvas__section-link" >Data Analysis Toolbox</a></li><li class="offcanvas__item hasChildren"><a href='/hst/observing/post-observation/exception-reports' class="offcanvas__section-link" >Exception Reports</a><button class="offcanvas__section-toggle" id="Exception_Reports_12_control" type="button" aria-label="Exception Reports submenu" aria-controls="Exception_Reports_12_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span 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Archive</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation' class="offcanvas__section-link" >Instrumentation</a><button class="offcanvas__section-toggle" id="Instrumentation_13_control" type="button" aria-label="Instrumentation submenu" aria-controls="Instrumentation_13_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Instrumentation_13_section" class="offcanvas__list" data-level="3" aria-labelledby="Instrumentation_13_control"><li class="offcanvas__item hasChildren firstInLevel"><a href='/hst/instrumentation/acs' class="offcanvas__section-link" >Advanced Camera for Surveys</a><button class="offcanvas__section-toggle" id="Advanced_Camera_for_Surveys_14_control" 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Information</a><button class="offcanvas__section-toggle" id="CTE_Information_17_control" type="button" aria-label="CTE Information submenu" aria-controls="CTE_Information_17_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="CTE_Information_17_section" class="offcanvas__list" data-level="6" aria-labelledby="CTE_Information_17_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/hst/instrumentation/acs/performance/cte-information/post-sm4-internal-cte-for-wfc' class="offcanvas__section-link" >Post-SM4 Internal CTE for WFC</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/performance/photometric-cte-corrections' class="offcanvas__section-link" >Photometric CTE Corrections</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/performance/pixel-based-cte-corrections' class="offcanvas__section-link" >Pixel-Based CTE Corrections</a></li><li class="offcanvas__item hasChildren lastInLevel"><a href='/hst/instrumentation/acs/performance/prism--grism' class="offcanvas__section-link" >Prism / Grism</a><button class="offcanvas__section-toggle" id="Prism_-_Grism_18_control" type="button" aria-label="Prism / Grism submenu" aria-controls="Prism_-_Grism_18_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Prism_-_Grism_18_section" class="offcanvas__list" data-level="6" aria-labelledby="Prism_-_Grism_18_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/acs/performance/prism--grism/acs-axe-downloadable-files' class="offcanvas__section-link" >ACS aXe Downloadable files</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/performance/prism--grism/wfc-g800l' class="offcanvas__section-link" >WFC G800L</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/performance/prism--grism/hrc-g800l' class="offcanvas__section-link" >HRC G800L</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/performance/prism--grism/hrc-pr200l' class="offcanvas__section-link" >HRC PR200L</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/acs/performance/prism--grism/sbc-pr110l-and-pr130l' class="offcanvas__section-link" >SBC PR110L and PR130L</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/acs/proposing' class="offcanvas__section-link" 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Transformations</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/acs/calibration' class="offcanvas__section-link" >Calibration</a><button class="offcanvas__section-toggle" id="Calibration_22_control" type="button" aria-label="Calibration submenu" aria-controls="Calibration_22_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Calibration_22_section" class="offcanvas__list" data-level="5" aria-labelledby="Calibration_22_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/acs/calibration/calibration-plans' class="offcanvas__section-link" >Calibration Plans</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools' class="offcanvas__section-link" target='_self' >Reference Files</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/acs/software-tools' class="offcanvas__section-link" >Software Tools</a><button class="offcanvas__section-toggle" id="Software_Tools_23_control" type="button" aria-label="Software Tools submenu" aria-controls="Software_Tools_23_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Software_Tools_23_section" class="offcanvas__list" data-level="5" aria-labelledby="Software_Tools_23_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/acs/software-tools/analysis-tools' class="offcanvas__section-link" >Analysis Tools</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/software-tools/calibration-tools' class="offcanvas__section-link" >Calibration Tools</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='http://drizzlepac.readthedocs.io/en/deployment/index.html' class="offcanvas__section-link" target='_blank' >DrizzlePac</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/acs/documentation' class="offcanvas__section-link" >Documentation</a><button class="offcanvas__section-toggle" id="Documentation_24_control" type="button" aria-label="Documentation submenu" aria-controls="Documentation_24_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Documentation_24_section" class="offcanvas__list" data-level="5" aria-labelledby="Documentation_24_control"><li class="offcanvas__item noChildren firstInLevel"><a href='https://hst-docs.stsci.edu/acsihb' class="offcanvas__section-link" target='_blank' >ACS Instrument Handbook</a></li><li class="offcanvas__item noChildren"><a href='https://hst-docs.stsci.edu/acsdhb' class="offcanvas__section-link" target='_blank' >ACS Data Handbook</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/documentation/instrument-science-reports-isrs' class="offcanvas__section-link" >Instrument Science Reports (ISRs)</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/documentation/stsci-analysis-newsletter-stan' class="offcanvas__section-link" >STScI Analysis Newsletter (STAN)</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/acs/documentation/conference-posters' class="offcanvas__section-link" >Conference Posters</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/acs/shortcuts' class="offcanvas__section-link" >Shortcuts</a><button class="offcanvas__section-toggle" id="Shortcuts_25_control" type="button" aria-label="Shortcuts submenu" aria-controls="Shortcuts_25_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Shortcuts_25_section" class="offcanvas__list" data-level="5" aria-labelledby="Shortcuts_25_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/acs/documentation/instrument-science-reports-isrs' class="offcanvas__section-link" target='_parent' >ACS ISRs</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/documentation/stsci-analysis-newsletter-stan' class="offcanvas__section-link" target='_parent' >ACS STANs</a></li><li class="offcanvas__item noChildren"><a href='http://etc.stsci.edu/etc/input/acs/imaging/' class="offcanvas__section-link" target='_blank' >ACS Imaging ETC</a></li><li class="offcanvas__item noChildren"><a href='http://etc.stsci.edu/etc/input/acs/spectroscopic/' class="offcanvas__section-link" target='_blank' >ACS Spectroscopic ETC</a></li><li class="offcanvas__item noChildren"><a href='http://etc.stsci.edu/etc/input/acs/rampfilter/' class="offcanvas__section-link" target='_blank' >ACS Ramp Filter ETC</a></li><li class="offcanvas__item noChildren"><a href='/hst/proposing' class="offcanvas__section-link" target='_self' >HST Proposing</a></li><li class="offcanvas__item noChildren"><a href='/hst/proposing/phase-i' class="offcanvas__section-link" target='_blank' >Phase I Proposals</a></li><li class="offcanvas__item noChildren"><a href='/hst/proposing/phase-ii' class="offcanvas__section-link" target='_self' >Phase II Proposal</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='https://hst-docs.stsci.edu/display/HSP/The+Hubble+Space+Telescope+Primer+for+Cycle+32' class="offcanvas__section-link" target='_blank' >HST Cycle 32 Primer</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/cos' class="offcanvas__section-link" >Cosmic Origins Spectrograph</a><button class="offcanvas__section-toggle" id="Cosmic_Origins_Spectrograph_26_control" type="button" aria-label="Cosmic Origins Spectrograph submenu" aria-controls="Cosmic_Origins_Spectrograph_26_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Cosmic_Origins_Spectrograph_26_section" class="offcanvas__list" data-level="4" aria-labelledby="Cosmic_Origins_Spectrograph_26_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/cos/instrument-design' class="offcanvas__section-link" >Instrument Design</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/cos/performance' class="offcanvas__section-link" >Performance</a><button class="offcanvas__section-toggle" id="Performance_27_control" type="button" aria-label="Performance submenu" aria-controls="Performance_27_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Performance_27_section" class="offcanvas__list" data-level="5" aria-labelledby="Performance_27_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/cos/performance/monitoring' class="offcanvas__section-link" >Monitoring</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/performance/sensitivity' class="offcanvas__section-link" >Sensitivity</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/cos/performance/spectral-resolution' class="offcanvas__section-link" >Spectral Resolution and Line Spread Functions</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/cos/proposing' class="offcanvas__section-link" >Proposing</a><button class="offcanvas__section-toggle" id="Proposing_28_control" type="button" aria-label="Proposing submenu" aria-controls="Proposing_28_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Proposing_28_section" class="offcanvas__list" data-level="5" aria-labelledby="Proposing_28_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/cos/proposing/cos2025-policies' class="offcanvas__section-link" >COS2025 Policies</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/proposing/observing-strategies' class="offcanvas__section-link" >Observing Strategies</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/cos/proposing/wavelength-tool' class="offcanvas__section-link" >Wavelength Tool</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/data-analysis--software-tools' class="offcanvas__section-link" >Data Analysis & Software Tools</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/cos/calibration' class="offcanvas__section-link" >Calibration</a><button class="offcanvas__section-toggle" id="Calibration_29_control" type="button" aria-label="Calibration submenu" aria-controls="Calibration_29_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Calibration_29_section" class="offcanvas__list" data-level="5" aria-labelledby="Calibration_29_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/cos/calibration/airglow' class="offcanvas__section-link" >Airglow</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-31-calibration-plan' class="offcanvas__section-link" >Cycle 31 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-30-calibration-plan' class="offcanvas__section-link" >Cycle 30 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-29-calibration-plan' class="offcanvas__section-link" >Cycle 29 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-28-calibration-plan' class="offcanvas__section-link" >Cycle 28 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-27-calibration-plan' class="offcanvas__section-link" >Cycle 27 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-26-calibration-plan' class="offcanvas__section-link" >Cycle 26 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-25-calibration-plan' class="offcanvas__section-link" >Cycle 25 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-24-calibration-plan' class="offcanvas__section-link" >Cycle 24 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-23-calibration-plan' class="offcanvas__section-link" >Cycle 23 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-22-calibration-plan' class="offcanvas__section-link" >Cycle 22 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-21-calibration-plan' class="offcanvas__section-link" >Cycle 21 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-20-calibration-plan' class="offcanvas__section-link" >Cycle 20 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-19-calibration-plan' class="offcanvas__section-link" >Cycle 19 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-18-calibration-plan' class="offcanvas__section-link" >Cycle 18 Calibration Plan</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/cos/calibration/cycle-17-calibration-plan' class="offcanvas__section-link" >Cycle 17 Calibration Plan</a></li></ul></li><li class="offcanvas__item hasChildren lastInLevel"><a href='/hst/instrumentation/cos/documentation' class="offcanvas__section-link" >Documentation</a><button class="offcanvas__section-toggle" id="Documentation_30_control" type="button" aria-label="Documentation submenu" aria-controls="Documentation_30_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite 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id="Space_Telescope_Imaging_Spectrograph_33_section" class="offcanvas__list" data-level="4" aria-labelledby="Space_Telescope_Imaging_Spectrograph_33_control"><li class="offcanvas__item hasChildren firstInLevel"><a href='/hst/instrumentation/stis/instrument-design' class="offcanvas__section-link" >Instrument Design</a><button class="offcanvas__section-toggle" id="Instrument_Design_34_control" type="button" aria-label="Instrument Design submenu" aria-controls="Instrument_Design_34_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Instrument_Design_34_section" class="offcanvas__list" data-level="5" aria-labelledby="Instrument_Design_34_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/stis/instrument-design/apertures' class="offcanvas__section-link" >Apertures</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/instrument-design/detectors' class="offcanvas__section-link" >Detectors</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/instrument-design/filters' class="offcanvas__section-link" >Filters</a></li><li class="offcanvas__item hasChildren lastInLevel"><a href='/hst/instrumentation/stis/instrument-design/gratings--prism' class="offcanvas__section-link" >Gratings / Prism</a><button class="offcanvas__section-toggle" id="Gratings_-_Prism_35_control" type="button" aria-label="Gratings / Prism submenu" aria-controls="Gratings_-_Prism_35_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Gratings_-_Prism_35_section" class="offcanvas__list" data-level="6" aria-labelledby="Gratings_-_Prism_35_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/hst/instrumentation/stis/instrument-design/gratings--prism/spectral-format-plots' class="offcanvas__section-link" >Spectral Format Plots</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/stis/performance' class="offcanvas__section-link" >Performance</a><button class="offcanvas__section-toggle" id="Performance_36_control" type="button" aria-label="Performance submenu" aria-controls="Performance_36_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Performance_36_section" class="offcanvas__list" data-level="5" aria-labelledby="Performance_36_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/stis/performance/anomalies' class="offcanvas__section-link" >Anomalies</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/performance/image-quality' class="offcanvas__section-link" >Image Quality</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/performance/monitoring' class="offcanvas__section-link" >Monitoring</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/performance/sensitivity' class="offcanvas__section-link" >Sensitivity</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/performance/spectral-resolution' class="offcanvas__section-link" >Spectral Resolution</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/performance/throughput' class="offcanvas__section-link" >Throughput</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/stis/performance/background-noise' class="offcanvas__section-link" >Background Noise</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/stis/proposing' class="offcanvas__section-link" >Proposing</a><button class="offcanvas__section-toggle" id="Proposing_37_control" type="button" aria-label="Proposing submenu" aria-controls="Proposing_37_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Proposing_37_section" class="offcanvas__list" data-level="5" aria-labelledby="Proposing_37_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/stis/proposing/go-wavecal-aperture-selection' class="offcanvas__section-link" >GO Wavecal Aperture Selection</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/stis/proposing/exception-reports' class="offcanvas__section-link" >Exception Reports</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/stis/observing-strategies' class="offcanvas__section-link" >Observing Strategies</a><button class="offcanvas__section-toggle" id="Observing_Strategies_38_control" type="button" aria-label="Observing Strategies submenu" aria-controls="Observing_Strategies_38_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Observing_Strategies_38_section" class="offcanvas__list" data-level="5" aria-labelledby="Observing_Strategies_38_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/stis/observing-strategies/target-acquisition' class="offcanvas__section-link" >Target Acquisition</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/observing-strategies/spectroscopy' class="offcanvas__section-link" >Spectroscopy</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/observing-strategies/imaging' class="offcanvas__section-link" >Imaging</a></li><li class="offcanvas__item hasChildren lastInLevel"><a href='/hst/instrumentation/stis/observing-strategies/available-modes' class="offcanvas__section-link" >Available Modes</a><button class="offcanvas__section-toggle" id="Available_Modes_39_control" type="button" aria-label="Available Modes submenu" aria-controls="Available_Modes_39_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Available_Modes_39_section" class="offcanvas__list" data-level="6" aria-labelledby="Available_Modes_39_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/stis/observing-strategies/available-modes/high-contrast-coronagraphy-at-small-inner-working-angles-with-bar5' class="offcanvas__section-link" >High Contrast Coronagraphy at Small Inner Working Angles with BAR5</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/stis/observing-strategies/available-modes/stis-bar5' class="offcanvas__section-link" >STIS BAR5</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/stis/data-analysis-and-software-tools' class="offcanvas__section-link" >Data Analysis and Software Tools</a><button class="offcanvas__section-toggle" id="Data_Analysis_and_Software_Tools_40_control" type="button" aria-label="Data Analysis and Software Tools submenu" aria-controls="Data_Analysis_and_Software_Tools_40_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Data_Analysis_and_Software_Tools_40_section" class="offcanvas__list" data-level="5" aria-labelledby="Data_Analysis_and_Software_Tools_40_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/hst/instrumentation/stis/data-analysis-and-software-tools/pixel-based-cti' class="offcanvas__section-link" >Pixel Based CTI</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/calibration' class="offcanvas__section-link" >Calibration</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/stis/documentation' class="offcanvas__section-link" >Documentation</a><button class="offcanvas__section-toggle" id="Documentation_41_control" type="button" aria-label="Documentation submenu" aria-controls="Documentation_41_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Documentation_41_section" class="offcanvas__list" data-level="5" aria-labelledby="Documentation_41_control"><li class="offcanvas__item noChildren firstInLevel"><a 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section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Data_Analysis_46_section" class="offcanvas__list" data-level="5" aria-labelledby="Data_Analysis_46_control"><li class="offcanvas__item noChildren firstInLevel"><a href='https://github.com/spacetelescope/WFC3Library/tree/master/notebooks/filter_transformations' class="offcanvas__section-link" target='_blank' >Color Conversion Notebook</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/data-analysis/full-well-depth' class="offcanvas__section-link" >Full Well Depth</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/documentation/grism-resources' class="offcanvas__section-link" >Grism Spectroscopy</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/wfc3/data-analysis/ir-flats' class="offcanvas__section-link" >IR Flats</a><button class="offcanvas__section-toggle" id="IR_Flats_47_control" type="button" aria-label="IR Flats submenu" aria-controls="IR_Flats_47_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="IR_Flats_47_section" class="offcanvas__list" data-level="6" aria-labelledby="IR_Flats_47_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/hst/instrumentation/wfc3/data-analysis/ir-flats/blob-delta-flats-from-earth-flat-calibration-images' class="offcanvas__section-link" >Blob Delta-flats from Earth Flat Calibration Images</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/data-analysis/ir-persistence' class="offcanvas__section-link" >IR Persistence</a></li><li class="offcanvas__item hasChildren"><a 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Photometric Calibration submenu" aria-controls="IR_Photometric_Calibration_50_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="IR_Photometric_Calibration_50_section" class="offcanvas__list" data-level="7" aria-labelledby="IR_Photometric_Calibration_50_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/hst/instrumentation/wfc3/data-analysis/photometric-calibration/ir-photometric-calibration/previous-ir-photometric-calibrations' class="offcanvas__section-link" >Previous IR Photometric Calibrations</a></li></ul></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/wfc3/data-analysis/photometric-calibration/ir-encircled-energy' class="offcanvas__section-link" 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href='/hst/instrumentation/wfc3/calibration-plan' class="offcanvas__section-link" >Calibration Plan</a><button class="offcanvas__section-toggle" id="Calibration_Plan_52_control" type="button" aria-label="Calibration Plan submenu" aria-controls="Calibration_Plan_52_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Calibration_Plan_52_section" class="offcanvas__list" data-level="5" aria-labelledby="Calibration_Plan_52_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/wfc3/calibration-plan/tv3-results' class="offcanvas__section-link" >TV3 Results</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/calibration-plan/tv2-results' 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href='/hst/instrumentation/wfc3/documentation/grism-resources/wfc3-ir-grism-data-reduction-cookbook' class="offcanvas__section-link" >WFC3 IR Grism Data Reduction Cookbook</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/documentation/grism-resources/grism-frequently-asked-questions' class="offcanvas__section-link" >Grism Frequently Asked Questions</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/documentation/grism-resources/ir-grism-sky-images' class="offcanvas__section-link" >IR Grism Sky Images</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/documentation/grism-resources/wfc3-g141-calibrations' class="offcanvas__section-link" >WFC3 G141 Calibrations</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/documentation/grism-resources/wfc3-g280-calibrations' class="offcanvas__section-link" >WFC3 G280 Calibrations</a></li><li class="offcanvas__item 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section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Focus_57_section" class="offcanvas__list" data-level="5" aria-labelledby="Focus_57_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/focus-and-pointing/focus/secondary-mirror-moves' class="offcanvas__section-link" >Secondary Mirror Moves</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/focus-and-pointing/focus/hst-focus-model' class="offcanvas__section-link" >HST Focus Model</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/focus-and-pointing/focus/tiny-tim-hst-psf-modeling' class="offcanvas__section-link" >Tiny Tim HST PSF Modeling</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/focus-and-pointing/pointing' class="offcanvas__section-link" >Pointing</a><button class="offcanvas__section-toggle" id="Pointing_58_control" type="button" aria-label="Pointing 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href='/hst/instrumentation/focus-and-pointing/fov-geometry' class="offcanvas__section-link" >FoV Geometry</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/focus-and-pointing/documentation' class="offcanvas__section-link" >Documentation</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/legacy' class="offcanvas__section-link" >Legacy Instruments</a><button class="offcanvas__section-toggle" id="Legacy_Instruments_59_control" type="button" aria-label="Legacy Instruments submenu" aria-controls="Legacy_Instruments_59_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Legacy_Instruments_59_section" class="offcanvas__list" data-level="4" aria-labelledby="Legacy_Instruments_59_control"><li class="offcanvas__item hasChildren firstInLevel"><a href='/hst/instrumentation/legacy/nicmos' class="offcanvas__section-link" >NICMOS</a><button class="offcanvas__section-toggle" id="NICMOS_60_control" type="button" aria-label="NICMOS submenu" aria-controls="NICMOS_60_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="NICMOS_60_section" class="offcanvas__list" data-level="5" aria-labelledby="NICMOS_60_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/hst/instrumentation/legacy/nicmos/instrument-science-reports-isrs' class="offcanvas__section-link" >Instrument Science Reports (ISRs)</a></li></ul></li><li class="offcanvas__item 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class="offcanvas__section-link" >Reference Data for Calibration and Tools</a><button class="offcanvas__section-toggle" id="Reference_Data_for_Calibration_and_Tools_62_control" type="button" aria-label="Reference Data for Calibration and Tools submenu" aria-controls="Reference_Data_for_Calibration_and_Tools_62_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Reference_Data_for_Calibration_and_Tools_62_section" class="offcanvas__list" data-level="4" aria-labelledby="Reference_Data_for_Calibration_and_Tools_62_control"><li class="offcanvas__item noChildren firstInLevel"><a href='https://hst-crds.stsci.edu/' class="offcanvas__section-link" target='_blank' >Calibration Reference Data System (CRDS)</a></li><li 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class="offcanvas__section-link" >Astronomical Catalogs</a><button class="offcanvas__section-toggle" id="Astronomical_Catalogs_63_control" type="button" aria-label="Astronomical Catalogs submenu" aria-controls="Astronomical_Catalogs_63_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Astronomical_Catalogs_63_section" class="offcanvas__list" data-level="5" aria-labelledby="Astronomical_Catalogs_63_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/the-agn-atlas' class="offcanvas__section-link" >The AGN Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/atmo-2020-atmosphere-models' class="offcanvas__section-link" >ATMO 2020 Atmosphere Models</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/brown-dwarfs-and-substellar-objects' class="offcanvas__section-link" >Brown Dwarfs and Substellar Objects</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/bruzual-atlas' class="offcanvas__section-link" >Bruzual Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/the-bruzual-charlot-atlas' class="offcanvas__section-link" >The Bruzual-Charlot Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/bruzual-and-charlot-2003' class="offcanvas__section-link" >Bruzual and Charlot 2003</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/bruzual-persson-gunn-stryker-atlas-list' class="offcanvas__section-link" >Bruzual-Persson-Gunn-Stryker Atlas list</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/buser-kurucz-atlas' class="offcanvas__section-link" >Buser-Kurucz Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/calobs' class="offcanvas__section-link" >CALOBS</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/calspec' class="offcanvas__section-link" >CALSPEC</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/castelli-and-kurucz-atlas' class="offcanvas__section-link" >Castelli and Kurucz Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/composite-qso-spectra-for-nir' class="offcanvas__section-link" >Composite QSO Spectra for NIR</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/the-galactic-emission-line-object-atlas' class="offcanvas__section-link" >The Galactic Emission Line Object Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/gunn-stryker-atlas-list' class="offcanvas__section-link" >Gunn-Stryker Atlas list</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/interstellar-extinction-curves' class="offcanvas__section-link" >Interstellar Extinction Curves</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/jacoby-hunter-christian-atlas' class="offcanvas__section-link" >Jacoby-Hunter-Christian Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/the-kinney-calzetti-spetral-atlas' class="offcanvas__section-link" >The Kinney-Calzetti Spectral Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/kinney-models' class="offcanvas__section-link" >Kinney Models</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/kurucz-1993-models' class="offcanvas__section-link" >Kurucz 1993 Models</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/non-stellar-spectra' class="offcanvas__section-link" >Non-Stellar Spectra</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/novae-models' class="offcanvas__section-link" >Novae Models</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/phoenix-models-available-in-synphot' class="offcanvas__section-link" >Phoenix Models available in Synphot</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/planetary-nebula-spectra' class="offcanvas__section-link" >Planetary Nebula Spectra</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/pickles-atlas' class="offcanvas__section-link" >Pickles Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/simple-stellar-population-atlas' class="offcanvas__section-link" >Simple Stellar Population Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/solar-system-objects-spectra' class="offcanvas__section-link" >Solar System Objects Spectra</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/swire-galaxies' class="offcanvas__section-link" >SWIRE Galaxies</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/the-trds-brown-atlas' class="offcanvas__section-link" >The TRDS Brown Atlas</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/trds-brown19-spectra-of-agns' class="offcanvas__section-link" >TRDS Brown19 Spectra of AGNs</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/modewave-data' class="offcanvas__section-link" >Modewave Data</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/documentation' class="offcanvas__section-link" >Documentation</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/documentation' class="offcanvas__section-link" >Documentation</a><button class="offcanvas__section-toggle" 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</li> </ul> </div> </nav> </div><main id="main-content" > <section id="section-6b4a7b4f-4bb1-4099-9e80-0b207a46032f" data-name="section-introduction-to-the-hubble-space-telescope" class="section-row none" > <h2 id="h2-sr-only-9a85fdde-44cb-44d6-b0d1-6e1030a2cd62" data-name="h2-sr-only-introduction-to-the-hubble-space-telescope" class="sr-only" data-include-in-navigation="true"> Introduction to the Hubble Space Telescope</h2> <div class="component-block container-fluid"> <div class="row"> <div class="page-intro__header section-separate col-sm-12 col-md-9 col-center text-center"> <p>The Hubble Space Telescope (HST) is a space-based observatory orbiting Earth. Hubble observes the universe in multiple wavelengths of light, from ultraviolet to visible to near-infrared.</p> </div> <div class="page-intro__main col-sm-12"> <div aria-label="part of the Hubble Space Telescope's Legacy ExtraGalactic UV Survey (LEGUS) image widget" class="centered" contenteditable="false" role="region" tabindex="-1"> </div> <p>The Hubble Space Telescope’s launch in 1990 marked the beginning of a new era in humanity’s exploration of the universe. From above Earth’s obscuring atmosphere, Hubble can obtain extremely high-resolution images and detailed spectroscopic data of the cosmos, from our solar system to the distant, early universe. Scientists submit proposals to use Hubble through an open, peer-reviewed, anonymous competition.</p> <p>Through the middle of the next decade, HST will remain the only space-based telescope providing spectroscopy and high-resolution imaging at ultraviolet, visible, and near-infrared wavelengths. Since the James Webb Space Telescope launched in 2021, the two observatories have been working in tandem to push astronomy forward and pursue the boldest scientific questions of our time.</p> <div contenteditable="false" tabindex="-1"> <figure class="captioned-img image no-lightbox" data-widget="image"><img alt="part of HST's Legacy ExtraGalactic UV Survey (LEGUS)" class="embedded-img lazyload" data-img-title="NGC 3627" data-lazy-srcset="" height="1000" src="/files/live/sites/www/files/home/hst/_images/Image-LEGUS-001.jpg" width="2400" /> <figcaption>NGC 3627, part of the Hubble Space Telescope's Legacy ExtraGalactic UV Survey (LEGUS), the sharpest, most comprehensive ultraviolet-light survey of star-forming galaxies in the nearby universe. The images are a blend of ultraviolet light and visible light from Hubble's Wide Field Camera 3 and Advanced Camera for Surveys.</figcaption> </figure> </div> <p data-index="0" style="text-align: center;"><a class="btn" href="http://hubblesite.org/" target="_blank" title="hubblesite.org/">HST For the Public</a></p> <h2 data-index="0" data-name="h2-using-the-hubble-telescope" id="h2-0-c6bf9316-0cfe-4bc2-9443-14ca83478df4" style="text-align: center;"><br /> Using the Hubble Telescope</h2> </div> </div> </div><div class="component-block container-fluid small-bleed related-links-block"> <div class="stylized-grid "> <div class="grid-single-wrapper"> <div class="grid-single-buffer" tabindex="-1"> <a href='/hst/proposing/phase-i' class='has-icon grid-single has-icon no-file-icon btn' target="_self" > <span class='grid-icon'> <span class='svg-sprite -none'> <svg role='img' focusable='false' aria-hidden='true'> <use xlink:href='&num;none'></use> </svg> </span> </span> <div class='grid-text-container'> <span class='grid-single-title'>Phase I Proposing</span> </div> </a></div> </div><div class="grid-single-wrapper"> <div class="grid-single-buffer" tabindex="-1"> <a href='/hst/proposing/phase-ii' class='has-icon grid-single has-icon 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<div class="preheader__item">December 16, 2024</div> </div> <div class="content-prev__image"> <img alt="Twisted pink and orange filaments lie against a black background speckled with white and pink stars. Five small, yellow circles overlaid on the left side of the image and one small, yellow circle at the top right corner indicate the positions of six of the ten stars surveyed in this study." class="lazyload" loading="lazy" src='//stsci-opo.org/STScI-01JC435G12EKFSEDH0MNJN81F7.jpg?t=tn370' sizes='(max-width: 370px) 370px,(max-width: 768px) 768px,(max-width: 992px) 992px,(max-width: 1200px) 1200px,(max-width: 1600px) 1600px,(max-width: 2400px) 2400px, 2400px' srcset='//stsci-opo.org/STScI-01JC435G12EKFSEDH0MNJN81F7.jpg?t=tn370 370w,//stsci-opo.org/STScI-01JC435G12EKFSEDH0MNJN81F7.jpg?t=tn768 768w,//stsci-opo.org/STScI-01JC435G12EKFSEDH0MNJN81F7.jpg?t=tn992 992w,//stsci-opo.org/STScI-01JC435G12EKFSEDH0MNJN81F7.jpg?t=tn1200 1200w,//stsci-opo.org/STScI-01JC435G12EKFSEDH0MNJN81F7.jpg?t=tn1600 1600w,//stsci-opo.org/STScI-01JC435G12EKFSEDH0MNJN81F7.jpg?t=tn2400 2400w ' /></div> <span id="card-read-more-3a8018ef-e1aa-43a0-9ffd-2024472c5f44" class="btn" aria-hidden="true">Read More</span> </div></li> <li class="content-prev-wrapper text-center latest-news"> <div class="content-prev flex-col content-prev--news-promo card flex-col" data-module-dynamic="card"> <h3 id="h3-news-item-7986bea5-dd33-4d0a-b3a4-eb9c1ea6aa39" class="content-prev__head"> <a href="https://hubblesite.org/contents/news-releases/2024/news-2024-010.html?" class="card-link" target="_blank"> NASA's Hubble Celebrates Decade of Tracking Outer Planets</a></h3> <div class="preheader preheader--news-promo-header"> <div class="preheader__item">December 09, 2024</div> </div> <div class="content-prev__image"> <img alt="A montage of Hubble Space Telescope images of our solar system's four giant outer planets: Jupiter, Saturn, Uranus, and Neptune, taken under the OPAL (Outer Planet Atmospheres Legacy) program over 10 years, from 2014 to 2024." class="lazyload" loading="lazy" src='//stsci-opo.org/STScI-01JE3XMES9TH3WPDCG1BTTRRPN.jpg?t=tn370' sizes='(max-width: 370px) 370px,(max-width: 768px) 768px,(max-width: 992px) 992px,(max-width: 1200px) 1200px,(max-width: 1600px) 1600px,(max-width: 2400px) 2400px, 2400px' srcset='//stsci-opo.org/STScI-01JE3XMES9TH3WPDCG1BTTRRPN.jpg?t=tn370 370w,//stsci-opo.org/STScI-01JE3XMES9TH3WPDCG1BTTRRPN.jpg?t=tn768 768w,//stsci-opo.org/STScI-01JE3XMES9TH3WPDCG1BTTRRPN.jpg?t=tn992 992w,//stsci-opo.org/STScI-01JE3XMES9TH3WPDCG1BTTRRPN.jpg?t=tn1200 1200w,//stsci-opo.org/STScI-01JE3XMES9TH3WPDCG1BTTRRPN.jpg?t=tn1600 1600w,//stsci-opo.org/STScI-01JE3XMES9TH3WPDCG1BTTRRPN.jpg?t=tn2400 2400w ' /></div> <span id="card-read-more-7986bea5-dd33-4d0a-b3a4-eb9c1ea6aa39" class="btn" aria-hidden="true">Read More</span> </div></li> <li class="content-prev-wrapper text-center latest-news"> <div class="content-prev flex-col content-prev--news-promo card flex-col" data-module-dynamic="card"> <h3 id="h3-news-item-a5b15a20-75fe-493a-9123-3ce0115320b6" class="content-prev__head"> <a href="https://hubblesite.org/contents/news-releases/2024/news-2024-024.html?" class="card-link" target="_blank"> NASA's Hubble Takes the Closest-Ever Look at a Quasar</a></h3> <div class="preheader preheader--news-promo-header"> <div class="preheader__item">December 05, 2024</div> </div> <div class="content-prev__image"> <img alt="This is a close-up look at the environment around quasar 3C 273 using Hubble's Space Telescope Imaging Spectrograph (STIS) coronagraph. A black circle blocks the glare of the quasar. Blue-colored filamentary material can be seen near the black hole at the center of its host galaxy. There's a blue-white smoke-like feature stretching to the 4 o'clock position, an extragalactic jet launched from the quasar." class="lazyload" loading="lazy" src='//stsci-opo.org/STScI-01JD56DW9WRH7W6PRBYVZGFK60.jpg?t=tn370' sizes='(max-width: 370px) 370px,(max-width: 768px) 768px,(max-width: 992px) 992px,(max-width: 1200px) 1200px,(max-width: 1600px) 1600px,(max-width: 2400px) 2400px, 2400px' srcset='//stsci-opo.org/STScI-01JD56DW9WRH7W6PRBYVZGFK60.jpg?t=tn370 370w,//stsci-opo.org/STScI-01JD56DW9WRH7W6PRBYVZGFK60.jpg?t=tn768 768w,//stsci-opo.org/STScI-01JD56DW9WRH7W6PRBYVZGFK60.jpg?t=tn992 992w,//stsci-opo.org/STScI-01JD56DW9WRH7W6PRBYVZGFK60.jpg?t=tn1200 1200w,//stsci-opo.org/STScI-01JD56DW9WRH7W6PRBYVZGFK60.jpg?t=tn1600 1600w,//stsci-opo.org/STScI-01JD56DW9WRH7W6PRBYVZGFK60.jpg?t=tn2400 2400w ' /></div> <span id="card-read-more-a5b15a20-75fe-493a-9123-3ce0115320b6" class="btn" aria-hidden="true">Read More</span> </div></li> </ul> </div></section><section id="section-fa6a9570-68cd-41e3-8dae-8c965669b7ac" data-name="section-upcoming-stsci-events" class="section-row none" > <div class="component-block container-fluid"> <div class="row"> <div class="section-header col-xs-12 text-center"> <h2 id="h2-6a357a94-a091-49a9-a0b7-a66cf228fd6e" data-name="h2-upcoming-stsci-events" class="section-header__title" data-include-in-navigation="true"> Upcoming STScI Events</h2> <p><a href="/events">View All Events</a></p> </div> </div> </div> <div class="component-block container-fluid"> <ul role="list" class="row-flex-sm content-prev-slider justify-content-center"> <li class="content-prev-wrapper text-center"> <div class="content-prev flex-col content-prev--border event-preview card" data-module-dynamic="card"> <h3 id="h3-event-preview-d600411f-f84a-4567-8576-7a8835fab983" class="content-prev__head" aria-describedby="card-read-more-d600411f-f84a-4567-8576-7a8835fab983"> <a href="/contents/events/jwst/2025/january/webb-office-hours" class="card-link" > Webb Office Hours</a></h3> <div class="text-overlay"> <picture class="dummy"> <img alt="Promotional image for Webb Office Hours" class="lazyload" loading="lazy" src='/modules/stsci-www-assets/assets/img/www/event-1.jpg?t=tn370' sizes='(max-width: 370px) 370px,(max-width: 768px) 768px,(max-width: 992px) 992px,(max-width: 1200px) 1200px,(max-width: 1600px) 1600px,(max-width: 2400px) 2400px, 2400px' srcset='/modules/stsci-www-assets/assets/img/www/event-1.jpg?t=tn370 370w,/modules/stsci-www-assets/assets/img/www/event-1.jpg?t=tn768 768w,/modules/stsci-www-assets/assets/img/www/event-1.jpg?t=tn992 992w,/modules/stsci-www-assets/assets/img/www/event-1.jpg?t=tn1200 1200w,/modules/stsci-www-assets/assets/img/www/event-1.jpg?t=tn1600 1600w,/modules/stsci-www-assets/assets/img/www/event-1.jpg?t=tn2400 2400w ' /></picture> <div class="text-overlay__head display-date"> <div class="display-date__content-wrapper"> <div class="display-date__content"> <span class="display-date__day"><span>9</span></span> <span class="display-date__break"> <span class="display-date__month"> Jan</span> <span class="display-date__year"> 2025</span> </span> </div> </div></div> </div> <p class="content-prev__sum">The JWST User Community is invited to call into Webb Office Hours to ask questions and directly interact with a team of STScI JWST experts via WebEx. We welcome questions about the...</p> <div class="content-prev__footer"> <span id="card-read-more-d600411f-f84a-4567-8576-7a8835fab983" class="btn" aria-hidden="true"> Read More </span> </div> </div></li> <li class="content-prev-wrapper text-center"> <div class="content-prev flex-col content-prev--border event-preview card" data-module-dynamic="card"> <h3 id="h3-event-preview-9be8812e-5dce-4ee1-aa14-6b3e83183f02" class="content-prev__head" aria-describedby="card-read-more-9be8812e-5dce-4ee1-aa14-6b3e83183f02"> <a href="/contents/events/stsci/2025/january/hst-at-the-245th-american-astronomical-society-meeting" class="card-link" > HST at the 245th American Astronomical Society Meeting</a></h3> <div class="text-overlay"> <picture class="dummy"> <img alt="HST at the 245th American Astronomical Society Meeting" class="lazyload" loading="lazy" src='/modules/stsci-www-assets/assets/img/www/event-2.jpg?t=tn370' sizes='(max-width: 370px) 370px,(max-width: 768px) 768px,(max-width: 992px) 992px,(max-width: 1200px) 1200px,(max-width: 1600px) 1600px,(max-width: 2400px) 2400px, 2400px' srcset='/modules/stsci-www-assets/assets/img/www/event-2.jpg?t=tn370 370w,/modules/stsci-www-assets/assets/img/www/event-2.jpg?t=tn768 768w,/modules/stsci-www-assets/assets/img/www/event-2.jpg?t=tn992 992w,/modules/stsci-www-assets/assets/img/www/event-2.jpg?t=tn1200 1200w,/modules/stsci-www-assets/assets/img/www/event-2.jpg?t=tn1600 1600w,/modules/stsci-www-assets/assets/img/www/event-2.jpg?t=tn2400 2400w ' /></picture> <div class="text-overlay__head display-date"> <div class="display-date__content-wrapper"> <div class="display-date__content"> <span class="display-date__day display-date__span-in-month"><span>12<span class="display-date__day-separator">-</span>16</span></span> <span class="display-date__break"> <span class="display-date__month"> Jan</span> <span class="display-date__year"> 2025</span> </span> </div> </div></div> </div> <p class="content-prev__sum">The 245th American Astronomical Society (AAS) meeting will include updates on the status of the HST observatory, an exhibit booth, press releases, and numerous science and technical...</p> <div class="content-prev__footer"> <span id="card-read-more-9be8812e-5dce-4ee1-aa14-6b3e83183f02" class="btn" aria-hidden="true"> Read More </span> </div> </div></li> <li class="content-prev-wrapper text-center"> <div class="content-prev flex-col content-prev--border event-preview card" data-module-dynamic="card"> <h3 id="h3-event-preview-dca198a8-4a67-48a1-b7c7-78d42c42a322" class="content-prev__head" aria-describedby="card-read-more-dca198a8-4a67-48a1-b7c7-78d42c42a322"> <a href="/contents/events/jwst/2025/january/jwst-at-the-245th-american-astronomical-society-meeting" class="card-link" > JWST at the 245th American Astronomical Society Meeting</a></h3> <div class="text-overlay"> <picture class="dummy"> <img alt="JWST at the 245th American Astronomical Society Meeting" class="lazyload" loading="lazy" src='/modules/stsci-www-assets/assets/img/www/event-3.jpg?t=tn370' sizes='(max-width: 370px) 370px,(max-width: 768px) 768px,(max-width: 992px) 992px,(max-width: 1200px) 1200px,(max-width: 1600px) 1600px,(max-width: 2400px) 2400px, 2400px' srcset='/modules/stsci-www-assets/assets/img/www/event-3.jpg?t=tn370 370w,/modules/stsci-www-assets/assets/img/www/event-3.jpg?t=tn768 768w,/modules/stsci-www-assets/assets/img/www/event-3.jpg?t=tn992 992w,/modules/stsci-www-assets/assets/img/www/event-3.jpg?t=tn1200 1200w,/modules/stsci-www-assets/assets/img/www/event-3.jpg?t=tn1600 1600w,/modules/stsci-www-assets/assets/img/www/event-3.jpg?t=tn2400 2400w ' /></picture> <div class="text-overlay__head display-date"> <div class="display-date__content-wrapper"> <div class="display-date__content"> <span class="display-date__day display-date__span-in-month"><span>12<span class="display-date__day-separator">-</span>16</span></span> <span class="display-date__break"> <span class="display-date__month"> Jan</span> <span class="display-date__year"> 2025</span> </span> </div> </div></div> </div> <p class="content-prev__sum">The 245th American Astronomical Society (AAS) meeting will include a variety of events focused on science with the James Webb Space Telescope (JWST) as we prepare for Cycle 4. The...</p> <div class="content-prev__footer"> <span id="card-read-more-dca198a8-4a67-48a1-b7c7-78d42c42a322" class="btn" aria-hidden="true"> Read More </span> </div> </div></li> </ul> </div></section><div class="credits dark-background-stsci-dark-blue"> <div class="container-fluid"> <div class="row"> <div class="col-xs-12"> <h2 id="h2-sr-only-pre-footer" class="sr-only">Pre-footer</h2> <div class="component-block container-fluid"> <div class="column-layout column-layout--with-dividers"> <div class="column-layout__column col-xs-12"> <div class="component-block container-fluid"> <h3 data-index="0" data-name="h4-please-contact-the-hst-help-desk-with-any-question" id="h4-CK-e73fba0b-54db-4c8d-8d8b-f894fb48f65a">HST Help Desk </h3> <p>Please contact the <a href="https://stsci.service-now.com/hst" target="_blank">HST Help Desk</a> with any questions. </p> <p> </p> <script>hljs.initHighlightingOnLoad();</script> </div></div> </div> </div><div class="social-media"> <p>Follow HST on:</p> <ul 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