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SDSS Data Release 1
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>SDSS Data Release 1</title> <link rel="stylesheet" type="text/css" href="./includes/sdss.css"> </head> <body topmargin="0" leftmargin="0" marginheight="0" marginwidth="0"> <table cellpadding="0" cellspacing="0" border="0" bgcolor="#ffffff"><tr> <td colspan="5" bgcolor="#6352c7" ><img alt="" src="images/hpHdr.gif" width="760" height="104" border="0"></td> <td width="5" class="colorborder"><img src="./images/spacer.gif" width="5" height="1" border="0" alt=""></td> </tr><tr> <td width="132" bgcolor="#000000" valign="top"> <!--Begin menubar for entry page (no link to "home"; from leftside-top.php)--> <table cellpadding="0" cellspacing="0" border="0" width="132"><tr> <td class="linkcell"><a href="./start/index.php" class="none"><span class="link">Where to Start</span></a></td> </tr><tr> <td class="divider"><img alt="" src="./images/spacer.gif" width="1" height="1" border="0"></td> </tr><tr> <td class="linkcell"><a href="./news/index.php" class="none"><span class="link">News and Updates</span></a></td> </tr><tr> <td class="divider"><img alt="" src="./images/spacer.gif" width="1" height="1" border="0"></td> </tr><tr> <td class="linkcell"><a href="./tutorials/index.php" class="none"><span class="link">Tutorials</span></a></td> </tr><tr> <td class="divider"><img alt="" src="./images/spacer.gif" width="1" height="1" border="0"></td> </tr><tr> <td class="linkcell"><a href="./products/index.php" class="none"><span class="link">Data Products</span></a></td> </tr><tr> <td class="divider"><img alt="" src="./images/spacer.gif" width="1" height="1" border="0"></td> </tr><tr> <td class="linkcell"><a href="./access/index.php" class="none"><span class="link">Data Access</span></a></td> </tr><tr> <td class="divider"><img alt="" src="./images/spacer.gif" width="1" height="1" border="0"></td> </tr><tr> <td class="linkcell"><a href="./coverage/index.php" class="none"><span class="link">Sky Coverage</span></a></td> </tr><tr> <td class="divider"><img alt="" src="./images/spacer.gif" width="1" height="1" border="0"></td> </tr><tr> <td class="linkcell"><a href="./instruments/index.php" class="none"><span class="link">Instruments</span></a></td> </tr><tr> <td class="divider"><img alt="" src="./images/spacer.gif" width="1" height="1" border="0"></td> </tr><tr> <td class="linkcell"><a href="./dataflow/index.php" class="none"><span class="link">Data Flow</span></a></td> </tr><tr> <td class="divider"><img alt="" src="./images/spacer.gif" width="1" height="1" border="0"></td> </tr><tr> <td class="linkcell"><a href="./algorithms/index.php" class="none"><span class="link">Algorithms</span></a></td> </tr><tr> <td class="divider"><img alt="" src="./images/spacer.gif" width="1" height="1" border="0"></td> </tr><tr> <td class="linkcell"><a href="./glossary/index.php" class="none"><span class="link">Glossary</span></a></td> </tr><tr> <td class="divider"><img alt="" src="./images/spacer.gif" width="1" height="1" border="0"></td> </tr><tr> <td class="linkcell"><a href="./help/index.php" class="none"><span class="link">Help and Feedback</span></a></td> </tr><tr> <td class="divider"><img alt="" src="./images/spacer.gif" width="1" height="1" border="0"></td> </tr><tr> <td class="linkcell"><a href="./search/index.php" class="none"><span class="link">Search</span></a></td> </tr><tr> <td><img alt="" src="./images/menuBottom.gif" width="132" height="6" border="0"></td> </tr><tr> <td><img alt="" src="./images/fields.gif" width="132" height="103" border="0"></td> </tr> </table> <!--End menu bar--> </td> <td width="5" class="colorborder"><img alt="" src="images/spacer.gif" width="5" height="1" border="0"></td> <td valign="top"> <table cellpadding="8" cellspacing="0" border="0"><tr> <td class="body"> <p>The Sloan Digital Sky Survey (see <a href="http://www.sdss.org">www.sdss.org</a> for general information) will map one-quarter of the entire sky and perform a redshift survey of galaxies, quasars and stars. The DR1 is the first major data release and provides <a href="./products/general/index.php">images, imaging catalogs, spectra, and redshifts</a> for download.</p> <p>As of September 27 2004, <a href="../dr3/">Data Release 3 (DR3)</a> is available, with more sky coverage and better reductions. We strongly encourage you to use DR3 data. The DR1 site will be kept online for some time for historical reference.</p> <p>We discovered during testing of the DR1 data set that the photometric pipeline suffered from a bug in the computation of model magnitudes and scale radii. <a href="./start/aboutdr1.php">About DR1</a> explains the effect of the bug. DR3 contains a reprocessing of the DR1 data with a new version of the photometric pipeline.</p> <p>Please refer to the <a href="./coverage/credits.php">credits page</a> for our sources of funding, participating institutions, how to acknowledge the use of SDSS data in your publications. Please also note how to refer to SDSS sources in your publications using the proper <a href="./coverage/IAU.php">IAU nomenclature for SDSS sources</a>.</p> <h2>Imaging</h2> <table border="1" width="100%"> <tr> <td>Footprint area</td> <td>2099 sq. deg.</td> </tr><tr> <td>Imaging catalog</td> <td>53 million unique objects</td> </tr><tr> <td>Data volume</td> <td> <table border="1"> <tr> <td>images</td><td>2.338 TB</td> </tr><tr> <td>catalogs</td><td>0.462 TB</td> </tr> </table> </td> </tr><tr> <td>Magnitude limits (95% detection repeatability for point sources)</td> <td> <table border="1"> <tr> <td><var>u</var></td> <td><var>g</var></td> <td><var>r</var></td> <td><var>i</var></td> <td><var>z</var></td> </tr> <tr> <td>22.0</td> <td>22.2</td> <td>22.2</td> <td>21.3</td> <td>20.5</td> </tr> </table> </td> </tr><tr> <td>PSF width</td> <td>1.4" median in <var>r</var></td> </tr><tr> <td>Photometric calibration</td> <td> <table border="1"> <tr> <td><var>r</var></td> <td><var>u-g</var></td> <td><var>g-r</var></td> <td><var>r-i</var></td> <td><var>i-z</var></td> </tr><tr> <td>2%</td> <td>3%</td> <td>2%</td> <td>2%</td> <td>3%</td> </tr> </table> </td> </tr><tr> <td>Astrometry</td> <td>< 0.1" rms absolute per coordinate</td> </tr> </table> <h2>Spectroscopy</h2> <table border="1" width="100%"> <tr> <td>Spectroscopic area</td> <td>1360 sq. deg. (Note: we earlier erroneously reported 1556 sq. deg. as spectroscopic area.)</td> </tr><tr> <td>Resolution</td> <td>1800</td> </tr><tr> <td>Signal-to-noise</td> <td>>4 per pixel at <var>g</var>=20.2</td> </tr><tr> <td>Redshift accuracy</td> <td>30 km/sec rms (from repeat observations)</td> </tr><tr> <td>Target magnitude limits for main samples</td> <td>Galaxies: Petrosian <var>r</var> <17.77<br /> Quasars: PSF <var>i</var> <19.1</td> </tr><tr> <td>Spectroscopic catalog</td> <td>186,250 objects, classified into<br /> <table> <tr> <td >134,000 Galaxies</td> </tr><tr> <td >17,700 Quasars (redshift <2.3)</td> </tr><tr> <td >980 Quasars (redshift >2.3)</td> </tr><tr> <td >17,600 Stars</td> </tr><tr> <td >4500 M stars and later</td> </tr><tr> <td >9700 Sky spectra</td> </tr><tr> <td >1770 Unknown class</td> </tr> </table> </tr><tr> <td>Data volume</td> <td> <table border="1"> <tr> <td>calibrated spectra ("2d")</td><td>0.014 TB</td> </tr><tr> <td>spectra, redshifts, line measurements ("1d")</td><td>0.039 TB</td> </tr> </table> </td> </tr> </table> <hr> <address> <!-- Warning the parse_this is used in bin/dr1webPublish.sh --> This is version <!-- parse_this --> v20041013_1341 . <!-- Done with reporting the version. --> <!-- Created: Tue Jul 30 21:49:21 DST 2002 --> <br> <p>If you are using Netscape 4.x and see oversized fonts, please look at the <a href="./coverage/credits.php#website">workaround on the Credits page</a>.</p></address> <!--Begin rest of page: this could be done by including the standard footer, --> <!--but this one is more complicated than the rest so I leave it here --> <!--for the time being.--> <!--Think about putting the images into the main table frame.--> </td> </tr> </table> <img alt="" src="./images/spacer.gif" width="314" height="1" border="0"></td> <td width="304" valign="top" align="center" bgcolor="#dddddd"> <table cellpadding="8" cellspacing="0" border="0" width="132"> <tr> <td><strong>News:</strong> DR3 is available. <a href="./news/index.php">More...</a> </td> </tr> <tr> <td><a href="./dr1photo_big.gif"> <img src="dr1photo.gif" alt="Imaging Sky Image" border="0"> </a> <table cellpadding="2" cellspacing="0" border="0" width="272"><tr> <td class="infoBoxes">SDSS DR1 Imaging Sky Coverage (Aitoff projection of Equatorial coordinates)</td> </tr></table> <br> <a href="./dr1spectro_big.gif"> <img src="dr1spectro.gif" alt="Spectral Sky Image" border="0"> </a> <table cellpadding="2" cellspacing="0" border="0" width="272"><tr> <td class="infoBoxes">SDSS DR1 Spectral Sky Coverage (Aitoff projection of Equatorial coordinates)</td> </tr></table></td> </tr></table> <img alt="" src="./images/spacer.gif" width="304" height="1" border="0"></td> <td width="5" class="colorborder"><img alt="" src="./images/spacer.gif" width="5" height="1" border="0"></td> </tr><tr> <td class="footer"> </td> <td width="5" class="colorborder"><img alt="" src="./images/spacer.gif" width="5" height="1" border="0"></td> <td colspan="2" class="footer"> Send your questions to <a href="mailto:sdss-helpdesk@fnal.gov" class="mailto">sdss-helpdesk@fnal.gov</a> </td> <td width="5" class="colorborder"><img alt="" src="./images/spacer.gif" width="5" height="1" border="0"></td> </tr></table> </body> </html>