Object name: ARP171

Designation(s): ARP171, NGC5718, IC1039, IC1041, IC1042, IC1043OLD,

Arp 171 is a pair of galaxies that appear to anchor a large cluster of galaxies located in northeastern Virgo about 375 million light years distant. Arp puts the pair in his class of galaxies with diffuse counter tails. Though I don't think he was aware of the huge plumes coming from this galaxies. In fact, I found no mention of them at all. Only the short "bright" plumes seen in his image. I think if he were aware of the huge plumes seen in my image he'd have included the entire field as it would fit within the usable field of the 200" scope. Not realizing they were there I gave this object my normal 40 minutes of luminance data. I needed several hours worth to really bring out the plumes. Still, they faintly show in my image with the larger convoluted one to the southeast and a shorter one to the northwest. The latter seems to just fade away into the background but the southeastern one ends abruptly in that direction turning back to the north-northeast.

The southeastern galaxy is NGC 5718 and is considered the cD galaxy anchoring the cluster. It is classed as S0 at NED and E-S0 at the NGC Project. It was discovered by William Herschel on April 30, 1786. It isn't in either of the Herschel 400 observing programs. The other galaxy is IC 1042 also an S0 galaxy. It was discovered by Stephane Javelle on May 28, 1891. Their S0 status probably explains why they show up as more white than the redder color of most elliptical galaxies. The only other IC galaxies in the image are IC 1041 and IC 1043 also discovered by Stephane Javelle on May 28, 1891.

In the annotated image cluster members are shown by their most common catalog number with no distance given. Non-members are shown only by distance with "G" denoting a galaxy an "Q" a quasar to the right of the object. A line to the object is used when the label had to be offset or identification would be ambiguous without the line. For purposes of determining which were cluster members I'm going with a paper that put the redshift limit for the cluster at 6824 to 8785 kps at the outside though they ended up using 8494 as the upper limit, I went with their more generous range. If a galaxy was near the limit and had a more known catalog name such as CGCG I did include both the name and distance. Just realize when this happens it may not be a cluster member.

It is likely many galaxies in the image without known redshift data are also members of the group there's no way to tell members from non-members. Some small ones are far behind the group and one is only one-fourth as far away. You need a score sheet to know who the players are it seems.

Arp's image

14" LX200R @ f/10, L=4x10' RGB=2x10'x3, STL-11000XM, Paramount ME

Related Designation(s):

2MASS J14402938+0325579, 2MASS J14403790+0322371, 2MASS J14403900+0328106, 2MASS J14404286+0327553, 2MASS J14404335+0322262, 2MASX J14402938+0325581, 2MASX J14403793+0322375, 2MASX J14403900+0328105, 2MASX J14404287+0327555, 2MASX J14404334+0322265, 2XMM J144029.3+032557, 2XMM J144038.0+032238, 2XMM J144043.0+032757, 2XMM J144043.3+032226, ARP 171, ARP 171 NED01, ARP 171 NED02, ARP171, ASK 100847.0, ASK 100886.0, ASK 101414.0, ASK 101416.0, ASK 101428.0, CGCG 047-133, CGCG 047-134, CGCG 047-135, CGCG 047-137, CGCG 1438.0+0338, CGCG 1438.1+0335, CGCG 1438.1+0340, CGCG 1438.2+0340, ECO 06539, GALEX J144042.8+032755, GALEXASC J144037.98+032237.9 , GALEXASC J144039.14+032813.2 , GALEXASC J144042.91+032754.3 , GALEXASC J144043.42+032227.5 , GALEXMSC J144029.35+032557.2 , GALEXMSC J144038.00+032239.1 , GALEXMSC J144039.15+032812.0 , GALEXMSC J144043.61+032229.6 , GASS 09702, HDCE 0885 NED001, HDCE 0885 NED002, HDCE 0885 NED003, IC 1039, IC 1041, IC 1042, IC 1043, IC1039, IC1041, IC1042, IC1043, IC1043OLD, IRAS F14381+0335, KIG 0638:[VOV2007] 023, KIG 0638:[VOV2007] 024, KIG 0638:[VOV2007] 029, KIG 0638:[VOV2007] 036, KIG 0638:[VOV2007] 037, KPG 431, KPG 431A, KPG 431B, LDCE 1075 NED003, LDCE 1075 NED004, LDCE 1075 NED005, LEDA 2800989, MAPS-NGP O_561_3099118, MAPS-NGP O_561_3229491, MAPS-NGP O_561_3229903, MCG +01-37-045, MCG +01-37-046, MCG +01-37-047, MKW 08:[ZAC2011] BCG, Mr18:[BFW2006] 01968 NED29, Mr18:[BFW2006] 01968 NED32, Mr18:[BFW2006] 01968 NED33, Mr19:[BFW2006] 04360 NED30, Mr19:[BFW2006] 04360 NED32, Mr19:[BFW2006] 04360 NED34, Mr19:[BFW2006] 04360 NED35, Mr20:[BFW2006] 07850 NED04, Mr20:[BFW2006] 07850 NED06, Mr20:[BFW2006] 07850 NED07, Mr20:[BFW2006] 07850 NED08, NFP J144029.4+032558, NFP J144043.4+032227, NGC 5718, NGC5718, NPM1G +03.0443, NPM1G +03.0444, NSA 018111, NSA 018120, NSA 018138, NSA 018274, NVSS J144042+032801, PGC 052428, PGC 052433, PGC 052434, PGC 052441, RX J1440.6+0327:[CAE99] a, RX J1440.6+0327:[CAE99] b, RX J1440.6+0328:[BEV98] 014, RX J1440.6+0328:[ZEH2003] 02 , SAFIRES J144037.89+032238.2, SDSS J144029.40+032557.8, SDSS J144029.40+032557.9, SDSS J144037.89+032237.2, SDSS J144037.89+032237.3, SDSS J144037.90+032237.2, SDSS J144037.90+032237.3, SDSS J144039.01+032810.9, SDSS J144039.01+032811.0, SDSS J144042.83+032755.2, SDSS J144042.83+032755.5, SDSS J144042.83+032756.0, SDSS J144043.35+032226.4, SDSS J144043.35+032226.5, SSTSL2 J144037.90+032237.5, UGC 09457, UGC 09459, USGC U646 NED06, USGC U646 NED07, USGC U646 NED08, USGC U646 NED09, UZC J144037.9+032238, UZC J144039.0+032811, UZC J144042.9+032755, UZC J144043.3+032227, UZC-CG 225 NED01, UZC-CG 225 NED02, UZC-CG 225 NED03, WBL 514:[HIV2012] 0311, WBL 514:[HIV2012] 0337, WBL 514:[HIV2012] 0424, WBL 514:[HIV2012] 0426, WBL 514:[HIV2012] 0433, WBL 518-002, WBL 518-003, WBL 518-004, WBL 518-005, [BFW2006] J220.12251+03.43275 , [BFW2006] J220.15790+03.37703 , [BFW2006] J220.16257+03.46972 , [BFW2006] J220.17848+03.46542 , [BFW2006] J220.18062+03.37402 , [DZ2015] 561-01, [DZ2015] 561-02, [DZ2015] 561-03, [GMM2009] 0225205, [GMM2009] 0349231, [HIV2012] 2817, [HIV2012] 2843, [HIV2012] 2930, [HIV2012] 2932, [HIV2012] 2939, [KG2002] J144029.48+032557.2 , [KG2002] J144037.98+032236.2 , [KG2002] J144039.06+032810.5 , [KG2002] J144042.88+032753.3 , [KG2002] J144043.41+032225.7 , [MGH2008] J144039.0+032811.0 , [MGH2008] J144042.8+032755.5 , [TTL2012] 020083, [TTL2012] 020095, [TTL2012] 033530, [TTL2012] 033925, [TTL2012] 034246,