Arp 257 (Gary Imm)

Celestial hemisphere: Southern · Constellation: Hydra (Hya)

Arp 257

This Astrobin Debut Object is a pair of interacting galaxies located 150 million light years away in the constellation of Hydra at a declination of -2 degrees. This object was classified by Dr. Arp into the category of Galaxies with Irregular Clumps.

The brightest object is UGC 4638, a magnitude 15 galaxy that spans 1 arc-minute in our apparent view and is 50,000 light years in diameter. The small galaxy just above is MCG+00-23-006, a magnitude 17 galaxy that is only 15,000 light years across and is the same distance away from us.

The galaxy structure here is unique – scattered bright blue patches of stars connected with broad star streams. It looks to me like we are catching a merger in progress. My inverted image (Revsion D) show each galaxy being distorted into 2 star stream haloes.

Final
Original
C
D

C

Description: Comparison to Original Arp Image

Uploaded: ...

D

Description: Inverted, showing 2 star stream haloes

Uploaded: ...

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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	4311569
PixInsight job	01GG5Q7HILON9N3COTDYRB55LQBAVWP1
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	08h51m37s.833
RA (top/left)	08h52m03s.523
RA (top/right)	08h51m11s.912
RA (bottom/right)	08h51m12s.139
RA (bottom/left)	08h52m03s.749

Dec (center)	-02°21′31″.76
Dec (top/left)	-02°16′40″.52
Dec (top/right)	-02°16′45″.20
Dec (bottom/right)	-02°26′22″.98
Dec (bottom/left)	-02°26′18″.30

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Arp 257

Arp 257

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Arp 257

Arp 257

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