Arp 77 (Gary Imm)

Arp 77

This object, also known as NGC 1097, is a barred spiral grand design galaxy located 50 million light-years away in the southern constellation of Fornax at a declination of -30 degrees. It spans about 9 arc-minutes in our apparent view, which corresponds to a diameter of 150,000 light years. The galaxy orientation is about 45 degrees to our line of sight, midway between face-on and edge-on.

Immediately surrounding the core is an unusually bright star-forming ring. Spiraling out from the ring are two dark dust lanes, which each transition to the end of the bar and the beginning of a spiral arm. The two long arms stream out from opposite ends of the core for about 180 degrees.

In addition to the bright star-forming ring, the other unique aspect of this object is the small companion galaxy 1097A located just above and to the right of the subject galaxy. Dr. Arp classified this galaxy in the category of “Spiral galaxies with Small High Surface Brightness Companions”. One of the subject galaxy's arms has wrapped around the companion, 40,000 light-years from the main galaxy's core. Gravitational interactions with the companion appear to be distorting the main galaxy arm. It also appears that there could be increased star generation in this vicinity, when comparing it against the same region on the opposite side.

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Status	Advanced success
Started	...
Astrometry.net job	4009669
PixInsight job	C1O5B4P8H0BLWUYG7VPG8LW8XHW597U1
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	02h46m19s.111
RA (top/left)	02h47m04s.378
RA (top/right)	02h45m30s.600
RA (bottom/right)	02h45m33s.719
RA (bottom/left)	02h47m08s.282

Dec (center)	-30°16′22″.61
Dec (top/left)	-30°08′14″.89
Dec (top/right)	-30°09′21″.64
Dec (bottom/right)	-30°24′29″.40
Dec (bottom/left)	-30°23′22″.44

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Arp 77

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