Object name: NGC7769
Designation(s): NGC7769, NGC7770, NGC7771, NGC7771A,
this is a group of interacting galaxies, NGC 7769, NGC 7770, NGC 7771 and NGC 7771A. They are about 170 millions light years away. NGC 7769 is the face on spiral to the upper right. The other big galaxy is NGC 7771. It shows more tidal distortions than NGC 7769. These are likely caused by NGC 7770 just below it. It is a double nucleus S0 galaxy. It could be the result of the merger of two such galaxies whose cores haven't yet merged. I found one paper in which radio HI emissions were used to try and determine this but there was too much noise in the data and they couldn't come to a conclusion. Note how the tidal arm of 7770 that goes down, ends very suddenly. The bright arm at the top left of NGC 7771 also ends abruptly. Very odd. The blue galaxy between NGC 7769 and 7771 is NGC 7771A. It appears that the interaction has triggered a lot of star formation in it. There are a few dwarf members of this group but they are only easily seen when I leave the data very noisy so I won't try and point them out. Toward the top is the more distant Seyfert galaxy MCG+03-60-031 which is 550 million light years away. Oddly the rather bright and large galaxy below it and above the NGC 7769-71 group is not in either the SIMBAD or NED database. I've determined it is PGC 214992 but that's all I know about it. The PGC catalog has been replaced with LEDA using the same numbers yet it isn't in the LEDA database that I can find. NGC 7771A is LEDA 214993 but there is no LEDA 214992. It apparently isn't a member of the group. A supernova was seen in NGC 7771 in 2003. Not unusual for tidally interacting galaxies. The interaction triggers star formation which tends to favor massive, short lived stars. Though this galaxy looks old by its reddish color.
Related Designation(s):2MASS J23510397+2009013, 2MASS J23512261+2005484, 2MASS J23512487+2006424, 2MASX J23510396+2009014, 2MASX J23512260+2005485, 2MASX J23512488+2006425, 2MASXi J2351039+200901, 2MASXi J2351226+200548, 2MASXi J2351248+200642, 2XMM J235103.8+200902, 2XMM J235122.6+200548, 2XMM J235124.8+200642, 2XMMp J235103.8+200902, 2XMMp J235122.6+200547, 2XMMp J235124.8+200642, 87GB 234852.3+194951, 87GB[BWE91] 2348+1949, AKARI J2351043+200859, AKARI J2351246+200640, CGCG 2348.5+1952, CGCG 2348.8+1949, CGCG 2348.9+1950, CGCG 455-054, CGCG 455-057, CGCG 455-058, GALEXASC J235103.91+200901.9 , GALEXASC J235113.13+200612.7 , GALEXASC J235124.82+200641.5 , GALEXMSC J235103.89+200901.4 , GALEXMSC J235113.12+200612.3 , GALEXMSC J235124.84+200641.3 , HDCE 1255 NED001, HDCE 1255 NED002, HDCE 1255 NED003, HOLM 820A, HOLM 820B, HOLM 820C, IPC 23488+1950, IRAS 23485+1952, IRAS 23488+1949, IRAS F23485+1952, IRAS F23488+1949, ISOSS J23515+2006, KAZ 346, KAZ 347, KAZ 348, KPG 592A, KPG 592B, KTG 82A, KTG 82B, KTG 82C, KUG 2348+198A, KUG 2348+198B, KUG 2348+198C, LDCE 1598 NED001, LDCE 1598 NED002, LDCE 1598 NED003, LEDA 214993, LGG 483:[G93] 001, LGG 483:[G93] 002, LGG 483:[G93] 004, MCG +03-60-030, MCG +03-60-034, MCG +03-60-035, MG3 J235128+2006, MRK 9005, MRK 9006, NGC 7769, NGC 7770, NGC 7771, NGC 7771 N, NGC 7771 S, NGC 7771 W, NGC 7771:[KCP2006] 1, NGC 7771:[KCP2006] 2, NGC 7771:[KCP2006] 3, NGC 7771A, NGC 7771N, NGC 7771W, NGC7769, NGC7770, NGC7771, NGC7771A, NPM1G +19.0594, NSA 152769, NSA 152776, NSA 152789, NSA 152791, NVSS J235104+200900, NVSS J235124+200641, PGC 072615, PGC 072635, PGC 072638, SDSS J235125.02+200641.9, SSTSL2 J235103.96+200901.5, SSTSL2 J235124.79+200641.4, TXS 2348+198, UGC 12808, UGC 12813, UGC 12815, USGC U857 NED01, USGC U857 NED02, USGC U857 NED04, UVQS J235122.60+200548.3, UZC J235103.9+200900, UZC J235122.6+200547, UZC J235124.6+200642, UZC-BGP 89A, UZC-BGP 89B, UZC-CG 290 NED01, UZC-CG 290 NED02, UZC-CG 290 NED03, VLSS J2351.4+2006, WBL 726-001, WBL 726-003, WBL 726-004, [M98j] 266 NED01, [M98j] 266 NED02, [RHM2006] LIRGs 007, [SLK2004] 1916, [TCW2007] 199, [WB92] 2348+1949, [WGB2006] 234830+19520_d, [WGB2006] 234830+19520_e, [WZX98] 23488+1949A, [WZX98] 23488+1949B, [WZX98] 23488+1949C,