Arp 241 (Gary Imm)

Celestial hemisphere: Northern · Constellation: Boötes (Boo)

Arp 241

This Astrobin Debut Object, also known as UGC 9425, is a tiny pair of interacting spiral galaxies located 0.5 billion light years away in the constellation of Bootes at a declination of +30 degrees. In his Arp catalog, Dr. Arp classified this object into the category of Galaxies with Appearance of Fission. We now believe that such objects are merging, not separating.

Each of these spiral galaxies is about 80,000 light years in diameter. Typical of a close pair of merging spiral galaxies, the pair is connected by a stellar bridge and each galaxy has a long tail extending away from the common center. The two galaxies appear to be different colors – the upper one appearing purple indicating HII regions and star formation, and the lower one orange indicating a dust region just to the right of the galaxy core.

This object has the nickname of Segner's Wheel, which is a water turbine with nozzles invented in the 18th century. Its principle is used in today’s water sprinklers. I am not sure why this object earned this nickname when there are so many other galaxy pairs which also have this appearance.

Below Arp 241 is a portion of the galaxy cluster known as Abell 1944, which is 2 billion light years away.

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Description: Comparison to Original Arp Image

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Status	Advanced success
Started	...
Astrometry.net job	4740507
PixInsight job	E2JT6XDZ01NE7F4ZYHAFMRPFE9S69W9W
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	14h37m50s.368
RA (top/left)	14h38m20s.683
RA (top/right)	14h37m19s.980
RA (bottom/right)	14h37m20s.116
RA (bottom/left)	14h38m20s.706

Dec (center)	+30°28′57″.97
Dec (top/left)	+30°33′46″.55
Dec (top/right)	+30°33′45″.24
Dec (bottom/right)	+30°24′08″.86
Dec (bottom/left)	+30°24′10″.33

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Arp 241

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