Zwicky's Triplet (Arp 103) is a
group
A group is a number of persons or things that are located, gathered, or classed together.
Groups of people
* Cultural group, a group whose members share the same cultural identity
* Ethnic group, a group whose members share the same ethnic iden ...
of three galaxies visible in the constellation
Hercules
Hercules (, ) is the Roman equivalent of the Greek divine hero Heracles, son of Jupiter and the mortal Alcmena. In classical mythology, Hercules is famous for his strength and for his numerous far-ranging adventures.
The Romans adapted the Gr ...
.
[ None of the galaxies is listed in the New General Catalogue (NGC) or Index Catalogue (IC), but all three are identified in the Catalogue of Principal Galaxies (PGC) published in 1989.
Arp 103’s brightest member is PGC 59061, at magnitude 15. Overlapping it on its southwestern flank is PGC 59062, which is smaller and fainter. Two arcminutes to the north of this pair is PGC 59065, a lenticular galaxy of magnitude 16. A faintly luminous tidal arm of intergalactic matter stretches between PGC 59061 and PGC 59065.
]
The other Zwicky's Triplet
IC 3481 at 12h 32m, +11° 24' (2000.0) in Virgo, which is connected to PGC 41646 ("IC 3481A") as the system Arp 175, but probably not connected to IC 3483, is sometimes called Zwicky's Triplet, but this name is more often applied to the system at 16h 49m, +45° 30' (2000.0) in Hercules.Courtney Seligman, IC 3481
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See also
* Wild's Triplet
* Robert's Quartet
Robert's Quartet is a compact galaxy group approximately 160 million light-years away in the constellation Phoenix (constellation), Phoenix. It is a family of four very different galaxies whose proximity to each other has caused the creation of ...
* Stephan's Quintet
Stephan's Quintet is a visual grouping of five galaxies of which four form the first Galaxy group#Compact Groups, compact galaxy group ever discovered. The group, visible in the constellation Pegasus (constellation), Pegasus, was discovered by É ...
* NGC 7331 Group
NGC 7331 Group is a visual grouping of galaxies in the constellation Pegasus. Spiral galaxy NGC 7331 is a foreground galaxy in the same field as the collection, which is also called the ''Deer Lick Group''. It contains four other members, affe ...
(also known as the Deer Lick Group, about half a degree northeast of Stephan's Quintet)
* Seyfert's Sextet
Seyfert's Sextet is a group of galaxies about 190 million light-years away in the constellation Serpens. The group appears to contain six members, but one of the galaxies, NGC 6027d, is a background object (700 million light years behind the g ...
* Copeland Septet
The Copeland Septet (also Copeland's Septet, Hickson Compact Group 57) is a group of galaxies in the constellation Leo that includes NGC 3748, NGC 3754, NGC 3750, NGC 3751, NGC 3745, NGC 3753 and NGC 3746. The group was discovered by Brit ...
References
Hercules (constellation)
Galaxy clusters
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