Object name: ARP001
Designation(s): ARP001, ARP285, NGC2854, NGC2856, NGC2857,
Arp 1 is obviously the first entry in his catalog and falls under the classification: Spiral galaxies: Low surface brightness. It is classed as an SC spiral. The other low surface brightness galaxies in his catalog are all small irregular dwarf galaxies of the Magellan class. This is the one exception. It is about 230 million light-years distant and is in the front leg of Ursa Major. Thus nearly twice as distant as Arp 285 and therefore a far larger galaxy. Though Arp has always argued against redshift data as a distance indicator, making him a maverick or crackpot depending on your point of view. While it is of low surface brightness it was still much easier to image than Arp 2 was. In fact, I was imaging Arp 285 not even realizing it would be in the same field of view. If I had, I'd have moved it down a bit to better frame both objects. It appears to be a rather classic two arm spiral except the arms are thinner than normal. Also, it has a very small core only a few seconds of arc across that is far brighter than the rest of the galaxy. I found no detail in the core, just an evenly bright star ball of population 2 stars. Those are stars that have low "metal" content having been formed for the most part about the same time the galaxy was born, likely over 10 billion years ago. Thus only yellow, orange and red stars still survive giving it the typical color of a galaxy core. The arms, like in most spirals, are composed of population 1 stars like our sun that have been formed long after the galaxy was formed. Those giving the arms their blue color are likely only a few 10's of millions of years old, up to a thousand times younger than those in the core. It was discovered by R. J. Mitchel on January 9, 1856.
Related Designation(s):1RXS J092416.8+491454, 2MASS J09240313+4912153, 2MASS J09241603+4914568, 2MASS J09243774+4921254, 2MASX J09240315+4912156, 2MASX J09241600+4914567, 2MASX J09243769+4921256, AKARI J0924028+491211, AKARI J0924163+491454, ARP 001, ARP 285, ARP 285 NED01, ARP 285 NED02, ARP001, ARP285, ASK 193263.0, CGCG 0920.6+4925, CGCG 0920.8+4927, CGCG 0921.2+4934, CGCG 238-046, CGCG 238-047, CGCG 238-049, ECO 03923, ECO 03945, ECO 03988, GALEXASC J092403.06+491214.2 , GALEXMSC J092403.10+491213.0 , HDCE 0528 NED001, HDCE 0528 NED002, IRAS 09206+4925, IRAS 09208+4927, IRAS 09212+4934, IRAS F09206+4925, IRAS F09209+4927, IRAS F09212+4934, KUG 0920+494A, KUG 0920+494B, LDCE 0641 NED001, LDCE 0641 NED002, LGG 168:[G93] 008, MCG +08-17-092, MCG +08-17-093, MCG +08-17-095, Mr18:[BFW2006] 06712 NED04, NGC 2854, NGC 2856, NGC 2856:[KCP2006] 1, NGC 2857, NGC2854, NGC2856, NGC2857, NSA 034016, NSA 034021, NSA 157236, NVSS J092402+491213, NVSS J092416+491456, PGC 026631, PGC 026648, PGC 026666, SDSS J092402.83+491213.7, SDSS J092403.10+491214.9, SDSS J092416.00+491457.0, SDSS J092416.00+491457.1, SDSS J092437.71+492125.7, SDSS J092437.72+492125.4, SDSS J092437.72+492125.7, SDSS J092437.73+492125.4, SDSS-g-fon-0490, SDSS-i-fon-0460, SDSS-r-fon-0484, SIP 0238-1, SSTSL2 J092403.13+491215.4, SSTSL2 J092416.05+491456.7, SSTSL2 J092437.73+492125.6, UGC 04995, UGC 04997, UGC 05000, UZC J092403.1+491215, UZC J092416.0+491457, UZC J092437.8+492126, WBL 221-001, WBL 221-002, WBL 221-003, [BFW2006] J141.15716+49.35714 , [LG2007] 10, [M98j] 066, [M98j] 066 NED01, [M98j] 066 NED02, [RHM2006] SFGs 120, [TTL2012] 544169,