| 词条 | Arp 87 |
| 释义 |
| name = NGC 3808A | image = Arp87full.jpg | image_size = 300px | caption=A visible light image of NGC 3808A (right) and 3808B (left). | credit= NASA/HST. | constellation name = Leo | epoch = J2000 | type = NGC 3808A: SAB(rs)c? pec[1] I0? pec[2] | ra = {{RA|11|40|44.4}}[1] | dec = {{DEC|+22|26|16}}[1] | dist_ly = | h_radial_v = 7113 km/s[1] | z = 0.023726[1] | appmag_v = 14.1[1] | size_v = 2.5′ × 0.8′[1] | notes = | names = {{odlist|NGC=3808|UGC=6643}}[1] NGC 3808A: {{odlist|MCG=+04-28-021|PGC=36227}}[2] NGC 3808B: {{odlist|MCG=+04-28-020|PGC=36228}}[3] }}Arp 87 (also known as NGC 3808) is a pair of two interacting galaxies, NGC 3808A and NGC 3808B. They are situated in the Leo constellation. NGC 3808A, the brighter, is a peculiar spiral galaxy,[2] while NGC 3808B is an irregular galaxy.[3] The two galaxies were discovered on 10 April 1785 by William Herschel. The two are located about 330 million light-years (100 megaparsecs) away from the Earth.[4] Arp 87 was observed by the Hubble Telescope in 2007, which revealed massive clouds of gas and dust flowing from one galaxy to another. Additionally, both galaxies appear to have been distorted.[5] See also
References1. ^1 2 3 4 5 6 {{cite web|url=http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=APG+187&extend=no&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES|title=NED results for object ARP 187|publisher=National Aeronautics and Space Administration / Infrared Processing and Analysis Center|work=NASA/IPAC Extragalactic Database|accessdate=21 April 2018}} 2. ^1 2 {{cite web|url=http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+3808A&extend=no&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES|title=NED results for object NGC 3808A|publisher=National Aeronautics and Space Administration / Infrared Processing and Analysis Center|work=NASA/IPAC Extragalactic Database|accessdate=21 April 2018}} 3. ^1 2 {{cite web|url=http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+3808B&extend=no&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES|title=NED results for object NGC 3808B|publisher=National Aeronautics and Space Administration / Infrared Processing and Analysis Center|work=NASA/IPAC Extragalactic Database|accessdate=21 April 2018}} 4. ^{{cite web|url=http://cseligman.com/text/atlas/ngc38.htm#3808|title=New General Catalogue objects: NGC 3800 - 3849|author=Seligman, Courtney|website=cseligman.com|accessdate=21 March 2018}} 5. ^{{cite web|url=https://www.spacetelescope.org/images/heic0717a/|title=Arp 87 | ESA/Hubble|website=www.spacetelescope.org|date=2007|accessdate=21 March 2018}} External links
6 : Arp objects|NGC objects|UGC objects|Interacting galaxies|Intermediate spiral galaxies|Irregular galaxies |
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