The globular cluster Palomar 4, taken by the Hubble Space Telescope
Observation data (J2000 epoch)
Constellation
Ursa Major
Right ascension
11h 29m 16.8s[1]
Declination
+28° 58′ 25″[1]
Distance
326 kly (100 kpc)
Physical characteristics
Other designations
UGCA 237, GCl 17[1]
See also: Globular cluster, List of globular clusters
Palomar 4 is a globular cluster of the Milky Way galaxy belonging to the Palomar Globular Clusters group. It was discovered in 1949 by Edwin Hubble and again in 1955 by A. G. Wilson. It is calculated to be 100,000 parsecs (330,000 light-years) from the Sun.[2]
This star cluster is further away than the SagDEG satellite galaxy.
Initially it was thought to be a dwarf galaxy, and it was given the name Ursa Major Dwarf. However, it was later discovered to be a globular cluster.
^ abc"SIMBAD Astronomical Database". Results for Palomar 4. Retrieved 2006-11-17.
^Zonoozi, Akram Hasani; Haghi, Hosein; Kroupa, Pavel; Küpper, Andreas H.W.; Baumgardt, Holger (19 January 2017). "Direct N-body simulations of globular clusters – III. Palomar 4 on an eccentric orbit". Monthly Notices of the Royal Astronomical Society: stx130. arXiv:1701.06168. doi:10.1093/mnras/stx130.
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