| 词条 | NGC 4639 |
| 释义 |
| name = NGC 4639 | image = Elegant spiral hides a hungry monster.jpg | image_size = 300px |caption = A Hubble Space Telescope (HST) image of NGC 4639.[1] |credit= HST/NASA/ESA. | epoch = J2000 | type = SB(rs)bc[2] | ra = {{RA|12|42|52.4}}[2] | dec = {{DEC|+13|15|27}}[2] | dist_ly = 73,202,542 ly[2] | z = 1018 ± 5 km/s[2] | appmag_v = 12.2[2] | group_cluster = Virgo Cluster | size_v = 2′.8 × 1′.9[2] | constellation name = Virgo | notes = | names = UGC 7884, PGC 42741, VCC 1943[2] }}NGC 4639 is a barred spiral galaxy located in the constellation Virgo. It lies over 70 million light-years away from planet Earth. Its core contains a massive black hole.[3] NGC 4639 is also classified as a Seyfert galaxy.[4] NGC 4639 is a member of the Virgo Cluster.[5] References1. ^{{cite web|title=Elegant spiral hides a hungry monster|url=http://www.spacetelescope.org/images/potw1541a/|accessdate=13 October 2015}} {{Ngc50}}{{galaxy-stub}}2. ^1 2 3 4 5 6 7 {{cite web | title=NASA/IPAC Extragalactic Database | work=Results for NGC 4639 | url=http://nedwww.ipac.caltech.edu/ | accessdate=2007-04-01}} 3. ^{{cite news|last1=Botkin-Kowacki|first1=Eva|title=Spectacular Hubble photo: A bright galaxy holds a hidden secret|url=http://www.csmonitor.com/Science/2015/1013/Spectacular-Hubble-photo-A-bright-galaxy-holds-a-hidden-secret|accessdate=14 October 2015|work=The Christian Science Monitor|date=13 October 2015}} 4. ^{{Cite web|url=https://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=NGC%204639&extend=no&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA%20or%20Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES|title=Your NED Search Results|website=ned.ipac.caltech.edu|access-date=2017-08-30}} 5. ^{{Cite web|url=https://ned.ipac.caltech.edu/cgi-bin/NEDatt?objname=NGC+4639|title=Detailed Object Classifications|website=ned.ipac.caltech.edu|access-date=2017-08-29}} 6 : Barred spiral galaxies|Virgo (constellation)|NGC objects|UGC objects|Principal Galaxies Catalogue objects|Virgo Cluster |
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