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{{Infobox Galaxy
| image = [[Image:NGC2976 3.6 5.8 8.0 microns spitzer.png|150px]]
| name = [[星云和星团新总表|NGC]] 2976
| type = SAc pec<ref name="ned">{{cite web
| title=NASA/IPAC Extragalactic Database
| work=Results for NGC 2976
| url=http://nedwww.ipac.caltech.edu/
| accessdate=2006-11-25
| archive-date=2011-05-14
| archive-url=https://web.archive.org/web/20110514100451/http://nedwww.ipac.caltech.edu/
| dead-url=no
}}</ref>
| ra = {{RA|09|47|15.4}}<ref name="ned" />
| dec = {{DEC|+67|54|59}}<ref name="ned" />
| dist_ly = (11.6 ± 1.2)×10<sup>6</sup> [[光年]]<ref name="karachentsevetal2004">{{cite journal
| author=I. D. Karachentsev, V. E. Karachentseva, W. K. Hutchmeier, D. I. Makarov
| title=A Catalog of Neighboring Galaxies
| journal=Astronomical Journal
| year=2004
| volume=127
| pages=2031–2068
| url=http://adsabs.harvard.edu/abs/2004AJ....127.2031K
| doi=10.1086/382905
| access-date=2010-08-26
| archive-date=2007-10-12
| archive-url=https://web.archive.org/web/20071012005906/http://adsabs.harvard.edu/abs/2004AJ....127.2031K
| dead-url=no
}}</ref><ref name="Karachentsevetal2006">{{cite journal
| author=Karachentsev, I. D.; Kashibadze, O. G.
| title=Masses of the local group and of the M81 group estimated from distortions in the local velocity field
| journal=Astrophysics
| year=2006
| volume=49
| issue=1
| pages=3–18
| url=http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2006Ap.....49....3K
| doi=10.1007/s10511-006-0002-6 }}</ref>
| z = 3 ± 5 km/[[second|s]]<ref name="ned" />
| appmag_v = 10.8<ref name="ned" />
| size_v = 5′.9 × 2′.7<ref name="ned" />
| constellation name = [[大熊座]]
| notes =
| names = H I.285, UGC 5221,<ref name="ned" /> PGC 28120<ref name="ned" />
}}
'''NGC 2976''' 是位于[[大熊座]]的一个[[螺旋星系]]，属于[[M81星系團]]<ref>{{cite web |title= NGC 2976 from Students for the Exploration and Development of Space |url= http://seds.org/messier/xtra/ngc/n2976.html |deadurl= yes |archiveurl= https://web.archive.org/web/20110805080306/http://www.seds.org/messier/xtra/ngc/n2976.html |archivedate= 2011-08-05 |accessdate= 2010-08-26 }}</ref>，位于[[波德星系|M81]]西南部1° 20′处。它是在1801年11月8日由[[英国]][[天文学家]][[威廉·赫歇尔]]首先发现，并在H I.星表中编号为285。

==特征==
NGC 2976的[[星系盘]]有明显的暗带结构，但并没有明显的螺旋状结构。[[哈勃太空望远镜]]的观测数据显示，NGC 2976外侧气体已脱离星系，而剩余气体则向星系内部倒塌。在星系外部的外侧恒星形成活跃区因此已经停止[[恒星]]形成，仅在星系内部区域有少数恒星诞生<ref>{{Cite web |url=http://astronomy.uua.cn/news/show-1617-1.html |title=独特的NGC 2976星系 |accessdate=2010-08-26 |archive-date=2012-07-08 |archive-url=https://archive.today/20120708124544/http://astronomy.uua.cn/news/show-1617-1.html |dead-url=no }}</ref>。

美国天文学家认为这种特征是因为NGC 2976在10亿年前曾与M81星系团发生交互反应，结果使得星系边缘的气体脱离，而剩下的气体则快速进入星系中心，因此也没有明显的螺旋状结构。

==图集==
<gallery>
Image:NGC 2976 Hubble WikiSky.jpg|[[哈勃太空望远镜]]拍摄的NGC 2976
Image:The Outer Regions of NGC 2976.jpg|NGC 2976的外部区域
</gallery>

== 参见 ==
* [[NGC天体列表 (2000-2999)]]

==参考资料==
{{reflist}}

{{Catalogs|NGC=2976}}

[[Category:螺旋星系]]
[[Category:大熊座]]
[[Category:NGC天体|2976]]
[[Category:M81星系团]]

NGC 2976 - 版本历史

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