The entire system is called Arp 105 or, colloquially, The Guitar, because of its overall shape. The enormously long tidal tail visible to the left (north) of NGC 3651A in the accompanying photo, Arp 105N, stretches out for 100,000 parsecs (325,000 light-years) from the parent galaxy. Ambartsumian's Knot lies at the end of a shorter tail called Arp 105S.
Arp 150 lies close to the center of the rich cluster Abell 1185, which lies about 400 million light-years away.
Related category• GALAXIES
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