编辑“︁NGC 4631”︁（章节）

== 鄰近的星系和星系群 ==
NGC 4631有一個鄰近的同伴，[[矮橢圓星系]]，[[NGC 4627]]。NGC 4627和NGC 4631 一起都列在''[[特殊星系圖集]]''當成"雙星系"或星系對的例子<ref name="arp1966">{{cite journal
  | author=H. Arp
  | title=Atlas of Peculiar Galaxies
  | journal=Astrophysical Journal Supplement
  | year=1966
  | volume=14
  | pages=1–20
  | url=http://adsabs.harvard.edu/abs/1966ApJS...14....1A
  | doi=10.1086/190147
  | access-date=2011-01-21
  | archive-date=2008-01-20
  | archive-url=https://web.archive.org/web/20080120061334/http://adsabs.harvard.edu/abs/1966ApJS...14....1A
  }}</ref>。

NGC 4631和NGC 4627都是[[NGC 4631群]]的一部分，這個星系群還包括交互作用星系[[NGC 4656]]和[[NGC 4656|NGC 4657]]<ref name="nbg">{{cite book 
  | author=R. B. Tully
  | year=1988
  | title=Nearby Galaxies Catalog
  | edition= 
  | publisher=Cambridge University Press
  | location=Cambridge
  | isbn=0-521-35299-1}}</ref><ref name="fouqueetal1992">{{cite journal
  | author=P. Fouque, E. Gourgoulhon, P. Chamaraux, G. Paturel
  | title=Groups of galaxies within 80 Mpc. II - The catalogue of groups and group members
  | journal=Astronomy and Astrophysics Supplement
  | year=1992
  | volume=93
  | pages=211–233
  | url=http://adsabs.harvard.edu/abs/1992A&AS...93..211F
  | access-date=2020-09-26
  | archive-date=2019-12-13
  | archive-url=https://web.archive.org/web/20191213165816/https://ui.adsabs.harvard.edu/abs/1992A%26AS...93..211F/abstract
  | dead-url=no
  }}</ref><ref name="garcia1993">{{cite journal
  | author=A. M. Garcia
  | title=General study of group membership. II - Determination of nearby groups
  | journal=Astronomy and Astrophysics Supplement
  | year=1993
  | volume=100
  | pages=47–90
  | url=http://adsabs.harvard.edu/abs/1993A&AS..100...47G
  | access-date=2020-09-26
  | archive-date=2019-12-13
  | archive-url=https://web.archive.org/web/20191213165818/http://adsabs.harvard.edu/abs/1993A%26AS..100...47G
  | dead-url=no
  }}</ref><ref name="giuricinetal2002">{{cite journal
  | author=G. Giuricin, C. Marinoni, L. Ceriani, A. Pisani
  | title=Nearby Optical Galaxies: Selection of the Sample and Identification of Groups
  | journal=Astrophysical Journal
  | year=2000
  | volume=543
  | pages=178–194
  | url=http://adsabs.harvard.edu/abs/2000ApJ...543..178G
  | doi=10.1086/317070
  | access-date=2011-01-21
  | archive-date=2019-01-21
  | archive-url=https://web.archive.org/web/20190121025030/http://adsabs.harvard.edu/abs/2000ApJ...543..178G
  | dead-url=no
  }}</ref>。但是，這個群的確認是有問題的，因為這個星系和其它的星系都未在天空中極為擁擠的一區，對這個星系群成員的估計數量從5<ref name="nbg" />到27<ref name="giuricinetal2002" />，所有的研究對這個星系群的成員數量都有不同的認定。

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