Arp 221 (Gary Imm)

Celestial hemisphere: Southern · Constellation: Hydra (Hya)

Arp 221

This Astrobin Debut Object is a small triple galaxy system, all located 250 million light years away in the constellation of Hydra at a declination of -11 degrees. It was classified by Dr. Arp into the category of Galaxies with Amorphous Spiral Arms.

The large disturbed lenticular galaxy at center is MCG-02-25-006. Its bright section is 45 arc-seconds wide in our apparent view, which corresponds to a diameter of 60,000 light years. Including the extended star streams doubles its size. The structure of this galaxy is fascinating – bright yellow core and inner section, a star stream outer disk which extends towards both companions, and 2 distinct blue star streams in the mid-region.

The elliptical companion to the right is 2MASX J09362516-1119441. The lenticular companion below is LEDA 3098245.

No distance is available for the two galaxies to the right in the image. I believe that these latter 2 spiral galaxies are larger in size and much further 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	4416405
PixInsight job	6BZ314ETJIQ4JTYA72AFA6943ROEPNIY
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	09h36m26s.675
RA (top/left)	09h36m50s.347
RA (top/right)	09h36m10s.140
RA (bottom/right)	09h36m03s.500
RA (bottom/left)	09h36m43s.341

Dec (center)	-11°20′00″.20
Dec (top/left)	-11°18′29″.95
Dec (top/right)	-11°15′37″.40
Dec (bottom/right)	-11°21′30″.37
Dec (bottom/left)	-11°24′23″.27

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Arp 221

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