Object name: ARP269
Designation(s): ARP269, NGC4490, NGC4485,
Arp 269 is made up of NGC 4485 and NGC 4490. The big one is NGC 4490 which is sometimes known as the Cocoon Galaxy. They are located in Canes Venatici which is high overhead in the evening this time of year. These two have had a near collision that has ripped stars out of both and started massive star formation in them as shown by the many bright HII regions (pink). NGC 4490 gets the Cocoon name for being embedded in a faint cocoon of stars much as a pupa is in a cocoon. I've posted two versions of this guy. The first as it is more normally seen and then a very deep processing to better show the cocoon of stars that surrounds it. The distance to these two is rather vague. I see published papers giving distances ranging from 25 to 60 million light years. Those citing about 35 million seems better researched so that's what I'll go with. There's very little on the net about these guys other than published papers so I don't have any links that are of much use here. I would have thought it a target for Hubble but it isn't in their database that I can find. But Chandra has looked at it in X-ray light.
Related Designation(s):11HUGS 288, 11HUGS 289, 2MASX J12303111+4142042, 2MASX J12303636+4138370, 2MASXi J1230311+414200, 2MASXi J1230368+413825, 2XMM J123035.9+413840, 2XMMp J123035.9+413840, 87GB 122809.0+415515, 87GB[BWE91] 1228+4155, ARP 269, ARP 269 NED01, ARP 269 NED02, ARP 269:[FHL2008] 27, ARP 269:[LM2005] ULX04, ARP269, B3 1228+419A, CGCG 1228.0+4159, CGCG 1228.1+4155, CGCG 216-007, CGCG 216-008, CXO J123036.2+413838, CXO J123036.26+413837.9, CXOU J123036.2+413837, CXOU J123036.2+413838, CXOU J123036.3+413837, HDCE 0706 NED071, HDCE 0706 NED072, HIJASS J1230+41, HOLM 414, HOLM 414A, HOLM 414B, IRAS 12281+4155, IRAS F12281+4155, ISOSS J12305+4139, IXO 62, KPG 341, KPG 341A, KPG 341B, KUG 1228+419, LCSB L0518O, LDCE 0867 NED116, LDCE 0867 NED117, LGG 290:[G93] 008, LGG 290:[G93] 015, MCG +07-26-013, MCG +07-26-014, NGC 4485, NGC 4485:[RW2000] X-01, NGC 4490, NGC 4490:[FHL2008] ULX-6, NGC 4490:[FK2005] 15, NGC 4490:[L2011a] X0005, NGC 4490:[LB2005] X01, NGC 4490:[MGS2012] 01, NGC 4490:[RPS97] 03, NGC 4490:[RW2000] X-02, NGC 4490:[WMR2006] XMM2, NGC4485, NGC4490, NSA 141527, PGC 041326, PGC 041333, RX J1230.5+4139, SDSS J123030.96+414201.4, UGC 07648, UGC 07651, USGC U480 NED10, USGC U480 NED11, UZC J123031.4+414201, UZC J123036.1+413834, VLSS J1230.5+4138, VV 030, VV 030a, VV 030b, WSRT-CVn [KOV2009] 67A, WSRT-CVn [KOV2009] 67B, [BDT2013] 14, [DMA2007] J123036.33+413837.78, [H92] 25, [M98j] 170 NED59, [M98j] 170 NED60, [SGT2004] J123036.32+413837.8 , [SLK2004] 0716, [SST2011] J123036.32+413837.8 , [STS2009a] J123036.32+413837.8, [TCW2007] 123, [TCW2007] 124, [VHC2007a] ULX5, [WB92] 1228+4155,