Arp 224 (Gary Imm)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: NGC 3916 · NGC 3921 · PGC 2486701 · PGC 2487197 · PGC 2488118 · PGC 2488967 · PGC 2489542 · PGC 2489548 · PGC 2489609 · PGC 2490363 · PGC 2490574 · PGC 2491113 · PGC 2491428 · PGC 2491459 · PGC 2491736 · PGC 2492862 · PGC 37013

Arp 224

This small object is located 280 million light years away in the constellation of Ursa Major at a declination of +55 degrees. It spans 2 arc-minutes in our apparent view, which corresponds to an actual span of 190,000 light years.

It is not clear exactly what is happening here. Little has been written on this 12.6 magnitude object to help in this understanding. Arp classified it in the category of "Galaxies with amorphous spiral arms". There appears to be a single bright core and several arcing star streams, so my guess is that this is a merger in progress that started with two galaxies (a spiral and an elliptical).

The background is almost as fascinating as the main object. Most of the background objects are galaxies, not stars. This includes four larger interesting edge-on spirals. The orange elliptical above and slightly left of center is PGC 2491113, the brightest galaxy in a cluster of galaxies known as Zwicky Cluster 1148.6+5523, one billion light years away.

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Status	Advanced success
Started	...
PixInsight job	LJ3W8MTVXT2KVKFTT39JVJLXLTY8IQ2I
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	11h51m06s.896
RA (top/left)	11h52m04s.953
RA (top/right)	11h50m06s.472
RA (bottom/right)	11h50m09s.165
RA (bottom/left)	11h52m07s.700

Dec (center)	+55°04′49″.39
Dec (top/left)	+55°11′18″.44
Dec (top/right)	+55°10′50″.95
Dec (bottom/right)	+54°58′18″.64
Dec (bottom/left)	+54°58′46″.30

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