NGC 7711 (Gary Imm)

Celestial hemisphere: Northern · Constellation: Pegasus (Peg) · Contains: NGC 7711

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NGC 7711

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NGC 7711

This object is an asymmetric spiral galaxy located 180 million light years away in the constellation of Pegasus at a declination of +15 degrees. The galaxy spans 5 arc-minutes in our apparent view, which corresponds to a diameter of 250,000 light years! I did not believe that a spiral galaxy could be this large!

However, I have now learned that this is not just one galaxy. As described in the 2011 paper "Tidal streams around galaxies" by Miskolczi, Bomans, and Dettmar, the remains of a faint dwarf companion lie to the right and slightly below the main galaxy. The tidal star stream from the interaction with this companion has been gravitationally wound around the main galaxy, which makes the overall size wide and asymmetric. It is interesting to me that the left side of the star stream almost perfectly resembles a galaxy disk, while on the right side the star stream is so faint that it is barely seen.

I believe that this is the first image of this object on Astrobin.

Takahashi Refractors
ZWO ASI183/QHY183
The refractors!
Cloudy Nights

Edge-on Galaxies

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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	3136704
PixInsight job	2I2P61Q0WRMAQ1VYCCZM77SC3F4DEL8O
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	23h35m39s.282
RA (top/left)	23h36m26s.471
RA (top/right)	23h34m53s.914
RA (bottom/right)	23h34m52s.159
RA (bottom/left)	23h36m24s.592

Dec (center)	+15°18′10″.30
Dec (top/left)	+15°27′35″.80
Dec (top/right)	+15°28′05″.85
Dec (bottom/right)	+15°08′43″.62
Dec (bottom/left)	+15°08′13″.63

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NGC 7711

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NGC 7711

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