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{{Infobox galaxy
| name = [[New General Catalogue|NGC]] 891
| image = NGC891HunterWilson.jpg
| image_size = 270px
|caption = NGC 891
| epoch = [[J2000]]
| type = SA(s)b?<ref name="ned">{{cite web
| title=NASA/IPAC Extragalactic Database
| work=Results for NGC 891
| url=http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+891&img_stamp=yes&extend=no
| access-date=2006-11-18 }}</ref>
| ra = {{RA|02|22|33.4}}<ref name="ned"/>
| dec = {{DEC|+42|20|57}}<ref name="ned"/>
| dist_ly = 27.3±1.8 [[光年|Mly]]（8.4±0.5[[秒差距|Mpc]]）<ref name="tonryetal2001">{{cite journal
| author=J. L. Tonry
| display-authors=4
| author2=A. Dressler
| author3=J. P. Blakeslee
| author4=E. A. Ajhar
| author5=A. B. Fletcher
| author6=G. A. Luppino
| author7=M. R. Metzger
| author8=C. B. Moore
| title=The SBF Survey of Galaxy Distances. IV. SBF Magnitudes, Colors, and Distances
| url=https://archive.org/details/sim_astrophysical-journal_2001-01-10_546_2/page/680
| journal=Astrophysical Journal
| date=2001
| volume=546
| issue=2
| pages=681–693
| bibcode=2001ApJ...546..681T | doi=10.1086/318301
|arxiv = astro-ph/0011223 | s2cid=17628238
}}</ref>
| z = 528 ± 4 km/[[second|s]]<ref name="ned"/>
| appmag_v = 10.8<ref name="ned"/>
| size_v = 13′.5 × 2′.5<ref name="ned"/>
| constellation name = [[仙女座]]
| names = [[Uppsala General Catalogue|UGC]] 1831, [[Principal Galaxies Catalogue|PGC]] 9031,<ref name="ned"/> [[科德韋爾深空天體表|Caldwell]] 23
}}{{NGCInfoBox|NGCID=NGC 891|發現者=卡羅琳·赫歇爾|發現日期=1783年8月27日|其他編號=UGC 1831,MCG 7-5-46,ZWG 538.52|曆元=J2000.0|赤經=2時22分33秒
|赤緯=42°20'50"|星座=仙女座|星體=星系|星等=10.1|表面亮度=13.1|藍等=10.9}}
[[File:Caldwell 23 - 2.jpg|thumb|200px|[[哈伯太空望遠鏡]]拍攝的NGC 891]]
'''NGC 891''' 是[[仙女座]]的一個無棒[[螺旋星系]]，距離地球约3000万光年。星系宽约10万光年，从地球的角度觀察正好是侧視。

1784年10月6日，[[威廉·赫歇爾]]發現NGC 891星系<ref name="Seligman">{{cite web |last1=Seligman |first1=Courtney |title=NGC 891 |url=http://cseligman.com/text/atlas/ngc8a.htm#891 |website=Celestial Atlas |access-date=8 November 2018}}</ref> 。NGC 891是[[本超星系團]]中[[NGC 1023星系群]]的成員，有一個H II核<ref name="hoetal1997">{{Cite journal
| last1 = Ho | first1 = Luis C.
| last2 = Filippenko | first2 = Alexei V.
| last3 = Sargent | first3 = Wallace L. W.
| date = October 1997
| title = A Search for "Dwarf" Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies
| journal = Astrophysical Journal Supplement
| volume = 112 | pages = 315–390
| bibcode = 1997ApJS..112..315H
| doi = 10.1086/313041
| issue = 2
|arxiv = astro-ph/9704107 | s2cid = 17086638
}}</ref>。

使用小型至中型[[望遠鏡]]可以看到NGC 891，看起來像一道微弱的細長光帶，使用較大口徑的望遠鏡則可以看到一條塵埃帶。

1999年，[[哈伯太空望遠鏡]]拍攝NGC 891[[紅外線]]影像。

2005年，NGC 891被選為[[大雙筒望遠鏡]]的首張光學影像<ref>{{cite web
|title = First Light Information
|publisher = Large Binocular Telescope Observatory
|date = 2008
|url = http://www.lbto.org/first_light_description.htm
|access-date = 10 January 2015
|url-status = dead
|archive-url = https://web.archive.org/web/20130709080751/http://www.lbto.org/first_light_description.htm
|archive-date = 9 July 2013
}}</ref><ref>{{cite web |url=http://www.lbto.org/first_light.htm |title=LBT "First Light" Image of NGC 891 |access-date=2015-02-28 |url-status=dead |archive-url=https://web.archive.org/web/20150228070937/http://www.lbto.org/first_light.htm |archive-date=2015-02-28 }}</ref>。2012年，它再次獲選[[探索頻道望遠鏡]]的首張光學影像<ref>{{cite web|last=Vitron|first=Tom|title=Lowell's NSF-funded Large Monolithic Imager sees first light|url=http://www.lowell.edu/news/2012/09/lowells-nsf-funded-large-monolithic-imager-sees-first-light-on-the-discovery-channel-telescope/|publisher=[[Lowell Observatory]]|access-date=27 September 2012|url-status=dead|archive-url=https://web.archive.org/web/20121102100916/http://www.lowell.edu/news/2012/09/lowells-nsf-funded-large-monolithic-imager-sees-first-light-on-the-discovery-channel-telescope/|archive-date=2 November 2012}}</ref>。

[[超新星]]SN 1986J於1986年8月21日被發現，視星等為14等。

== 參考資料 ==
{{Reflist}}
{{Ngc10}}
{{NGCReference|891}}
{{Catalogs|NGC=891}}
{{科德韦尔天体}}

[[Category:科德韦尔天体|23]]

NGC 891 - 版本历史

imported>Zestbot：​/* 參考資料 */ Bot：標準化Wikitext

imported>Zestbot：/* 參考資料 */ Bot：標準化Wikitext