Arp 103 - Zwicky’s Triplet (Gary Imm)

Celestial hemisphere: Northern · Constellation: Hercules (Her) · Contains: NGC 6241 · PGC 2264555 · PGC 2265308 · PGC 2265793 · PGC 2265865 · PGC 2265943 · PGC 2265994 · PGC 59061 · PGC 59062 · PGC 59065

Arp 103 - Zwicky’s Triplet

This object is a trio of interacting galaxies located 0.5 billion light years away in the constellation of Hercules at a declination of +45 degrees. As seen in the Astrobin mouseover, the trio consists of the large central galaxy (PGC 59061), its companion immediately to the right (PGC 59062), and the galaxy above which is connected by a faint star stream (PGC59065). The largest of these, PGC 59061, has a diameter of 0.7 arc-minutes in our apparent view, which corresponds to an actual diameter of 90,000 light years.

In addition to these 3 galaxies, there are 7 additional ones shown in the Astrobin mouseover which also seem to be part of the same galaxy group. The prettiest of these is the disturbed spiral NGC 6241.

This object is often referred to as Zwicky’s Triplet. It is very interesting to me that I could find no discussion of the origin of this nickname. I assume that this triplet was discovered by the famed Dr. Fritz Zwicky. The late Dr. Zwicky was a renowned Swiss astronomer. Among many other things, he discovered neutron stars and the concept of dark matter in our universe. He holds over 50 patents and was awarded the Medal of Freedom by Truman for his work on rocket propulsion.

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Status	Advanced success
Started	...
Astrometry.net job	3565587
PixInsight job	4G9AF95RX8Y9NBPUCIRFS4032PERQVA6
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	16h49m30s.977
RA (top/left)	16h50m27s.508
RA (top/right)	16h48m32s.972
RA (bottom/right)	16h48m34s.688
RA (bottom/left)	16h50m28s.733

Dec (center)	+45°28′32″.19
Dec (top/left)	+45°36′10″.69
Dec (top/right)	+45°35′49″.54
Dec (bottom/right)	+45°20′52″.11
Dec (bottom/left)	+45°21′13″.30

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Arp 103 - Zwicky’s Triplet

Arp 103 - Zwicky’s Triplet

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