Object name: NGC6166
NGC 6166 anchors the galaxy cluster Abell 2199 in western Hercules at about 410 million light-years. So why did it make my Arp-like list? If you dig into its core you find there are four objects in there. Or are they foreground objects or background ones seen right through the galaxy? Adding to the confusion, three of the four have redshift data which vary rather greatly. While NGC 6166 is listed with a redshift of about 413 million light years, component A has a redshift that puts it 422 million light-years distant, B 369 million and C 446 million. Seems hard to believe objects around the center of the galaxy could have such a wide variation in velocity. How was the 413 figure determined, an average? That is 408 if the pure mean is used. There is a 4th component D is not listed in NED though it is listed at the NGC Project. My image seems to show a 5th member south of B/D and north of C. I think I see it in the Sloan image as well. Likely is just a foreground star. Adding to the confusion, there are 4 galaxies carrying the NGC 6166 name labeled A through D that are unrelated to the core features A through D. These galaxies are identified by name in the annotated image.
Related Designation(s):3C 338, 4C +39.45, 6C B162655.7+393934, 87GB 162654.7+393938, 87GB[BWE91] 1626+3939, ABELL 2199:[ATS88] 12, ABELL 2199:[BO85] 001, ABELL 2199:[CG99] 010, ABELL 2199:[LGC91] 0164, ABELL 2199:[PL95] BCG, ABELL 2199:[RS72] 089, ABELL 2199:[ZBO89] R3, B2 1626+39, B3 1626+396, CGCG 1626.9+3940, CGCG 224-039, CoNFIG 251, CTA 072, DA 413, EF B1626+3939, EUVE J1628+39.5, GB2 1626+396, HOLM 751A, LQAC 247+039 003, MCG +07-34-060, MG4 J162838+3933, NGC 6166, NGC6166, NRAO 0504, NVSS J162838+393300, PGC 058265, RGB J1628+395, SA 2199-010, TXS 1626+396, UGC 10409, USGC U766 NED23, UZC J162838.5+393306, VLSS J1628.6+3933, VV 364, WBL 616-001, WN J1628+3932, [GBW2010] CoNFIG1 248, [JP2001] 162701+3941, [LPP2009] 1626+396, [LVO2003] J162837.7+393255, [M98j] 251 NED04, [MO2001] J162838.5+393304.4, [OWT88] 162655.37+393938.2, [VE75] CL 1627+39, [WB92] 1626+3939,