Arp 87

{{short description|Pair of interacting galaxies in the constellation Leo}}

{{Infobox Galaxy

| name = NGC 3808A

| image = Arp87full.jpg

| caption=NGC 3808A (right) and 3808B (left) imaged by the Hubble Space Telescope

| constellation name = Leo

| epoch = J2000

| type = NGC 3808A: SAB(rs)c? pec
I0? pec

| ra = {{RA|11|40|44.4}}{{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|access-date=21 April 2018}}

| dec = {{DEC|+22|26|16}}

| dist_ly =

| h_radial_v = 7113 km/s

| z = 0.023726

| appmag_v = 14.1

| size_v = 2.5′ × 0.8′

| notes =

| names = {{odlist|NGC=3808|UGC=6643}}
NGC 3808A: {{odlist|MCG=+04-28-021|PGC=36227}}{{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|access-date=21 April 2018}}
NGC 3808B: {{odlist|MCG=+04-28-020|PGC=36228}}{{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|access-date=21 April 2018}}

}}

Arp 87 (also known as NGC 3808) is a pair of interacting galaxies, NGC 3808A and NGC 3808B. They are situated in the Leo constellation. NGC 3808A, the brighter, is a peculiar spiral galaxy, while NGC 3808B is an irregular galaxy.

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.{{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|access-date=21 March 2018}} Arp 87 was observed by the Hubble Space 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.{{cite web|url=https://www.spacetelescope.org/images/heic0717a/|title=Arp 87 | ESA/Hubble|website=www.spacetelescope.org|date=2007|access-date=21 March 2018}}

Arp 87 is an isolated member of the Coma Supercluster.{{Cite journal |last1=Gregory |first1=S. A. |last2=Thompson |first2=L. A. |date=1978-06-01 |title=The Coma/A1367 supercluster and its environs. |url=https://ui.adsabs.harvard.edu/abs/1978ApJ...222..784G |journal=The Astrophysical Journal |volume=222 |pages=784–799 |doi=10.1086/156198 |bibcode=1978ApJ...222..784G |issn=0004-637X}}

One supernova has been observed in NGC 3808A: SN{{nbsp}}2013db (type II-P, mag. 17.1) was discovered by Robert Gagliano, Jack Newton, and Tim Puckett on 29 May 2013.{{cite journal | bibcode=2013CBET.3550....1G | title = Supernova 2013db in NGC 3808 = Psn J11404399+2225549 | last1= Gagliano | first1= R. | last2= Newton | first2= J. | last3= Puckett | first3= T. | journal = Central Bureau Electronic Telegrams | date = 2013 | volume = 3550 | page = 1}}{{cite web | website=Transient Name Server | title=SN{{nbsp}}2013db | url=https://www.wis-tns.org/object/2013db | publisher = IAU | access-date=30 September 2024}}