Object name: ARP305
Designation(s): ARP305, NGC4016, NGC4017,
ARP 305 is a pair of galaxies. That's how Arp classified them as well, "Group Character: Double Galaxies. This is the same classification as Arp 303 though this pair is far more interesting. The northern galaxy is NGC 4016. It looks to me as if it has two sets of spiral arms. One set narrow and looping back to the core like a pretzel while the other pair are broad and set at nearly a right angle to the first pair. Both are obviously due to tidal effects of a close encounter, probably with NGC 4017. But explaining their vast difference would seem to me to be a major headache. Could it be two merged or superimposed galaxies? If so, rotational rates would likely be different but since we see it so face on, likely not enough different to be measurable. NGC 4016 is classed by NED as SBdm:. Train-wreck is likely a better classification. One note at NED says of it: "Distorted, patchy, hints of spiral structure in the outskirts". Odd but I thought those arms were rather obvious. Why it isn't classed as peculiar as well I can't fathom. NGC project though does class it SBc-Irr which makes more sense to me.
Related Designation(s):2MASS J11582907+2731433, 2MASS J11584566+2727087, 2MASX J11582910+2731431, 2MASX J11584562+2727084, 2MASXi J1158291+273143, 2MASXi J1158456+272709, AKARI J1158458+272708, ARP 305, ARP 305 NED01, ARP 305 NED02, ARP305, ASK 572810.0, ASK 574221.0, CGCG 1155.8+2748, CGCG 1156.1+2743, CGCG 157-068, CGCG 157-069, ECO 03221, ECO 03226, HDCE 0686 NED004, IRAS 11561+2743, IRAS F11559+2748, IRAS F11561+2743, KUG 1155+278, KUG 1156+277, LDCE 0855 NED004, LGG 262:[G93] 003, LGG 262:[G93] 004, MAPS-NGP O_320_0538364, MCG +05-28-063, MCG +05-28-065, NGC 4016, NGC 4017, NGC4016, NGC4017, NSA 102193, NSA 102480, NVSS J115828+273144, NVSS J115834+272916, NVSS J115845+272709, PGC 037687, PGC 037705, SDSS J115829.01+273143.6, SDSS J115829.02+273143.6, SDSS J115845.66+272708.7, SDSS J115845.67+272708.7, SDSS J115845.67+272708.8, UGC 06954, UGC 06967, USGC U435 NED01, USGC U435 NED02, UZC J115829.0+273144, UZC J115845.8+272710, VV 424, [KG2002] J115829.00+273144.0 , [KG2002] J115845.83+272709.7 , [M98j] 151 NED03, [TTL2012] 320135, [TTL2012] 332742,