Arp 166 (Gary Imm)

Celestial hemisphere: Northern · Constellation: Triangulum (Tri) · Contains: NGC 733 · NGC 736 · NGC 738 · NGC 739 · NGC 740 · NGC 750 · NGC 751 · NGC 761

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Arp 166

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Arp 166

This object is a pair of elliptical galaxies connected by a star stream bridge, located 220 million light years away in the constellation of Triangulum at a declination of +33 degrees. Not including the long star stream to the upper left, this object spans 2 arc-minutes in our apparent view, which corresponds to an actual width of 125,000 light years.

The upper galaxy of Arp 166 is NGC 750, the lower is NGC 751. I don't recall ever seeing a barbell structure connecting two galaxies quite like this before. It is so clean, symmetric and well defined that it looks fake to me. Several faint star stream shells are seen in the outer regions, which is characteristic of an elliptical galaxy post merger. Many small galaxies are seen in the background in the immediate vicinity of Arp 166, all significantly further away than Arp 166.

Although Arp 166 is the main attraction here, there are a number of other interesting objects. The spiral galaxy at far left is NGC 761, the spiral galaxy at far right is NGC 740, and the elliptical galaxy at far right is NGC 736. Note the faint star stream (reminiscent of the Umbrella Galaxy) extending up and to the left of the elliptical galaxy.

Many other tiny but beautiful galaxies are visible in the background.

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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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Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Status	Advanced success
Started	...
Astrometry.net job	3271767
PixInsight job	3SIST5CQLFBW0UGNJTMGOMK0TD5AREUE
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	01h57m25s.732
RA (top/left)	01h57m04s.110
RA (top/right)	01h55m48s.332
RA (bottom/right)	01h57m47s.261
RA (bottom/left)	01h59m03s.430

Dec (center)	+33°13′04″.61
Dec (top/left)	+33°34′46″.82
Dec (top/right)	+33°04′21″.00
Dec (bottom/right)	+32°51′22″.00
Dec (bottom/left)	+33°21′43″.51

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Arp 166

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