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The distance to this galaxy remains elusive, with measurements ranging from {{val|6|u=Mpc}}<ref name=Slater2019/> up to {{val|21|u=Mpc}}.<ref name=Elagli2019/> This galaxy forms a member of the NGC 1566 subgroup of the [[Dorado Group]], of which it is dominant and brightest member<ref name="deVaucouleurs1973" /><ref name="Huchraetal1982"/><ref name="Firthetal2006"/> (although [[Virginia Kilborn|Kilborn]] and colleagues (2005) listed it as second brightest member of the NGC 1566 group after NGC 1553). The X-ray emission from the group is dominated by the hot gas halo of this galaxy, which extends out to {{Val|29|u=kpc}} before merging with the background radiation.<ref name="Kilbornetal2005"/> The galaxy appears to be interacting with smaller members of its subgroup.<ref name=Slater2019/> Radio emissions suggest the disk is asymmetrical and the neutral hydrogen gas shows a mild warp.<ref name=Elagli2019/> The [[Galaxy morphological classification|morphological classification]] of NGC 1566 is SAB(rs)bc,<ref name=Elagli2019/> which indicates a spiral galaxy with a weak [[Barred spiral galaxy|bar structure]] around the nucleus (SAB), an incomplete ring around the bar (rs), and showing wound [[spiral arms|arms]] (bc). The spiral arms are strong and symmetrical.<ref name=Slater2019/> The [[galactic plane]] is inclined at an angle of {{val|31|7|u=°}} to the [[Line-of-sight propagation|line of sight]] to the [[Earth]] and the long axis is oriented along a [[position angle]] of {{val|219|4|u=°}}.<ref name=Elagli2019/> The northwest side of the galaxy is more strongly obscured by dust, suggesting it is the near side.<ref name=Slater2019/> The mass ratio of neutral hydrogen gas to the mass of the stars is 0.29, which is on the high side for a galaxy of this mass.<ref name=Elagli2019/> Absolute luminosity is {{Solar luminosity|link=y|3.7{{e|10}}}},<ref name="Kilbornetal2005"/> and is calculated to contain {{Solar mass|link=y|1.4{{e|10}}}} of [[H I region|H&nbsp;I]].<ref name="Kilbornetal2005" /> NGC 1566 is an [[Active galactic nucleus|active galaxy]] with many features of a [[Seyfert galaxy|Seyfert type 1]], although the exact type remains uncertain. It is one of the closest and brightest Seyfert galaxies. The mass of the [[supermassive black hole]] at the center is estimated at {{Val|1.3|0.6|e=7|ul=solar mass}}. The proximity of the galaxy, along with strong spiral arms and an active nucleus, have made it the subject of much scientific study in the astronomy community.<ref name=Slater2019/> It is the nearest known CL AGN galaxy.<ref>{{Cite journal |last1=Xu |first1=D. W. |last2=Komossa |first2=S. |last3=Grupe |first3=D. |last4=Wang |first4=J. |last5=Xin |first5=L. P. |last6=Han |first6=X. H. |last7=Wei |first7=J. Y. |last8=Bai |first8=J. Y. |last9=Bon |first9=E. |last10=Cangemi |first10=F. |last11=Cordier |first11=B. |last12=Dennefeld |first12=M. |last13=Gallo |first13=L. C. |last14=Kollatschny |first14=W. |last15=Kong |first15=De-Feng |year=2024 |title=Changing-Look Narrow-Line Seyfert 1 Galaxies, their Detection with SVOM, and the Case of NGC 1566 |journal=Universe |language=en |volume=10 |issue=2 |pages=61 |doi=10.3390/universe10020061 |doi-access=free |arxiv=2401.10600 |bibcode=2024Univ...10...61X |issn=2218-1997}}</ref> On June 19, 2010, Berto Monard from South Africa detected a [[apparent magnitude|magnitude]] 16 [[supernova]] {{val|13|ul=arcsecond}} west and {{Val|22|u=arcsecond}} south of the center of NGC 1566.<ref name=Monard2010/> It was designated SN 2010el<ref name="supernovae.net"/> and was of type Iax.<ref name=Takaro2020/> A second supernova was discovered on 11 November 2021: [[SN 2021aefx]] ([[Type Ia supernova|Type&nbsp;Ia]], mag 12).<ref>[https://www.wis-tns.org/object/2021aefx Transient Name Server entry for SN 2021aefx.] Retrieved 4 January 2023.</ref> [[File:NGC1566 - Noirlab2208a.jpg|thumb|Spanish Dancer Galaxy Twirls into View from NSF’s NOIRLab in Chile <ref>[https://noirlab.edu/public/news/noirlab2208/ Spanish Dancer Galaxy Twirls into View from NSF’s NOIRLab in Chile] Retrieved 30 January 2023.</ref>]] [[File:NGC 1566 (52523099436).png|thumb|Image of NGC 1566 taken by James Webb's [[Mid-Infrared Instrument]]]] ==References== {{Reflist|refs= <ref name=GaiaDR2>{{Cite Gaia DR2|4779165759875235200}}</ref> <ref name=Sinnott1997>{{cite book | first1=Roger W. | last1=Sinnott | first2=Michael A. C. | last2=Perryman | title=Millennium Star Atlas | volume=1 | year=1997 | isbn=0-933346-84-0 | publisher=Sky Publishing Corporation and the European Space Agency }}</ref> <ref name=seligman>{{cite web | title=NGC 1566 | first=Courney | last=Seligman | website=seligman.com | url=https://cseligman.com/text/atlas/ngc15a.htm#1566 | access-date=2020-08-21 }}</ref> <ref name=Takaro2020>{{cite journal | title=Constraining Type Iax supernova progenitor systems with stellar population age dating | display-authors=1 | last1=Takaro | first1=Tyler | last2=Foley | first2=Ryan J. | last3=McCully | first3=Curtis | last4=Fong | first4=Wen-fai | last5=Jha | first5=Saurabh W. | last6=Narayan | first6=Gautham | last7=Rest | first7=Armin | last8=Stritzinger | first8=Maximilian | last9=McKinnon | first9=Kevin | journal=Monthly Notices of the Royal Astronomical Society | volume=493 | issue=1 | pages=986–1002 | date=March 2020 | doi=10.1093/mnras/staa294 | doi-access=free | arxiv=1901.05461 | bibcode=2020MNRAS.493..986T }}</ref> <ref name=Monard2010>{{cite journal | title=Supernova 2010el in NGC 1566 | last=Monard | first=L. A. G. | journal=Central Bureau Electronic Telegrams | volume=2334 | page=1 | date=June 2010 | editor1-last=Green | editor1-first=D. W. E. | bibcode=2010CBET.2334....1M }}</ref> <ref name=Slater2019>{{cite journal | title=Outflows in the inner kiloparsec of NGC 1566 as revealed by molecular (ALMA) and ionized gas (Gemini-GMOS/IFU) kinematics | last1=Slater | first1=R. | last2=Nagar | first2=N. M. | last3=Schnorr-Müller | first3=A. | last4=Storchi-Bergmann | first4=T. | last5=Finlez= | first5=C. | last6=Lena | first6=D. | last7=Ramakrishnan | first7=V. | last8=Mundell | first8=C. G. | last9=Riffel | first9=R. 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I - Nearby groups | last1=Huchra | first1=John Peter | author-link1=John Peter Huchra | last2=Geller | first2=Margaret J. | author-link2=Margaret J. Geller | volume=257 | pages=423–437 | issue=Part 1 | date=June 15, 1982 | journal=Astrophysical Journal | doi=10.1086/160000 | bibcode=1982ApJ...257..423H }}</ref> <ref name="Firthetal2006">{{citation | last1=Firth | first1=P. | last2=Evstigneeva | first2=E. A. | last3=Jones | first3=J. B. | last4=Drinkwater | first4=M. J. | last5=Phillipps | first5=S. | last6=Gregg | first6=M. D. | title=Kinematics, substructure and luminosity-weighted dynamics of six nearby galaxy groups | display-authors=4 | journal=[[Monthly Notices of the Royal Astronomical Society]] | date=November 2006 | volume=372 | issue=4 | pages=1856–1868 | bibcode=2006MNRAS.372.1856F | arxiv=astro-ph/0608584 | doi=10.1111/j.1365-2966.2006.10993.x | doi-access=free | s2cid=18646500 | postscript=. }}</ref> <ref name="deVaucouleurs1973">{{citation | title=Southern Galaxies.VI. Luminosity Distribution in the Seyfert Galaxy NGC 1566 | last=de Vaucouleurs | first=Gérard | author-link=Gérard de Vaucouleurs | journal=Astrophysical Journal | volume=181 | pages=31–50 | date=April 1, 1973 | bibcode=1973ApJ...181...31D | doi=10.1086/152028 }}</ref> <ref name="Kilbornetal2005">{{citation | first1=Virginia A. | last1=Kilborn | display-authors=4 | first2=Bärbel S. | last2=Koribalski | author2-link = Bärbel Koribalski | first3=Duncan A. | last3=Forbes | first4=David G. | last4=Barnes | first5=Ruth C. | last5=Musgrave | title=A Wide-Field Hi Study of the NGC 1566 Group | journal=Monthly Notices of the Royal Astronomical Society | volume=356 | issue=1 | pages=77–88 | date=January 2005 | bibcode=2005MNRAS.356...77K | arxiv=astro-ph/0409743 | doi=10.1111/j.1365-2966.2004.08450.x | doi-access=free }}</ref> <ref name="supernovae.net">{{cite web | title=Latest Supernovae | publisher=supernovae.net (International Supernovae Network) | author=David Bishop | url=http://www.rochesterastronomy.org/snimages/ | access-date=2010-06-21 }}</ref> }} ==External links== {{commons category}} * [https://web.archive.org/web/20070831165142/http://gallery.spitzer.caltech.edu/Imagegallery/image.php?image_name=sig05-013 Spitzer Space Telescope page on NGC 1566] * Discovery image of [http://www.rochesterastronomy.org/sn2010/n1566s1.jpg SN 2010el] (2010-06-19; The star to the left of the core of the galaxy is magnitude 12.3) * {{WikiSky}} {{Ngc20}} {{Dorado}} {{Sky|04|20|00.4|-|54|56|16|60000000}} {{DEFAULTSORT:Ngc 1566}} [[Category:Intermediate spiral galaxies]] [[Category:Seyfert galaxies]] [[Category:Dorado]] [[Category:Dorado Group]] [[Category:NGC objects|1566]] [[Category:Principal Galaxies Catalogue objects|14897]] [[Category:Discoveries_by_James_Dunlop]] [[Category:Astronomical objects discovered in 1826]] </textarea><div class="templatesUsed"><div class="mw-templatesUsedExplanation"><p><span id="templatesused">Pages transcluded onto the current 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