NGC 7656 (Gary Imm)

Celestial hemisphere: Southern · Constellation: Aquarius (Aqr) · Contains: NGC 7656

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NGC 7656

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NGC 7656

This image captures two primary galaxies in the constellation of Aquarius at a declination of -19 degrees.

The galaxy in the upper left corner is NGC 7656, located 330 million light years away. The object spans 1.3 arc-minutes in our apparent view, which corresponds to a diameter of 125,000 light years. I am surprised that this object was not included by Arp in his Peculiar Galaxies Catalog. The loop extension is fascinating to me. I could not find a detailed image of this object. SIMBAD identifies 2 tiny galaxies in this area, albeit without distance information - one (LEDA 860406) immediately to the right of NGC 7656, and one further right and down a bit. My best guess is that LEDA 860406 passed close by NGC 7656 and caused the loop structure through gravitational interaction. In addition to the loop, there is a star stream which extends to the right through LEDA 860406.

The galaxy in the lower right corner is ESO 605-4 , located 350 million light years away. The object spans 1.2 arc-minutes in our apparent view, which corresponds to a diameter of 125,000 light years, the same as NGC 7656. This galaxy is a barred spiral and looks a bit disturbed to me. Immediately to the lower left of this galaxy is another galaxy (LEDA 860787). These galaxies could be interacting but I could find no distance information for the 2nd galaxy.

ZWO ASI183/QHY183
Unique or Unusal Deep Sky Targets
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Takahashi Refractors

Astrobin Debuts (670 DSOs)
Galaxy Loops

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Status	Advanced success
Started	...
Astrometry.net job	3035282
PixInsight job	WRD1506WY9V2K4KKLQSVWEGSG5VEMOXD
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	23h24m06s.652
RA (top/left)	23h24m51s.714
RA (top/right)	23h24m03s.278
RA (bottom/right)	23h23m21s.615
RA (bottom/left)	23h24m10s.400

Dec (center)	-19°01′41″.81
Dec (top/left)	-19°03′57″.17
Dec (top/right)	-18°50′50″.36
Dec (bottom/right)	-18°59′25″.81
Dec (bottom/left)	-19°12′33″.49

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