Palomar 1

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Palomar 1
Palomar 1 Hubble WikiSky.jpg
Palomar 1 by Hubble Space Telescope; 3.3′ view
Credit: NASA/STScI/WikiSky
Observation data (J2000 epoch)
Right ascension03h 33m 20.04s[1]
Declination+79° 34′ 51.8″[1]
Distance36.5 ± 4.2 kly (11,200 ± 1,300 pc)[2]
Apparent magnitude (V)+13.18
Apparent dimensions (V)2′.8
Physical characteristics
Radius15 ly[3]
Estimated age6.3 to 8 Gyr[2]
Notable features-
Other designationsLEDA 13165[4]
See also: Globular cluster, List of globular clusters

Palomar 1 is a globular cluster in the constellation Cepheus in the halo possibly in the Outer Arm of the Milky Way galaxy. First discovered by George O. Abell in 1954 on the Palomar Survey Sky plates,[5] it was catalogued as a globular cluster. At 6.3 to 8 Gyr, it is a very young cluster when compared to the other globular clusters in the Milky Way.[2] It is a relatively metal-rich globular with [Fe/H] = -0.60.[6] It is likely that Palomar 1 has a similar evolutionary history to the Sagittarius dwarf companion globular Terzan 7, that is, it may have once been associated with a dwarf spheroidal galaxy that was later destroyed by tidal forces.[6]


  1. 1.0 1.1 Goldsbury, Ryan et al. (December 2010), "The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters", The Astronomical Journal 140 (6): 1830–1837, arXiv:1008.2755, Bibcode 2010AJ....140.1830G, doi:10.1088/0004-6256/140/6/1830.
  2. 2.0 2.1 2.2 Rosenberg, A. et al. (1998), "Palomar 1 - Another young Galactic halo globular cluster", Astronomical Journal 115 (2): 648, arXiv:astro-ph/9710242, Bibcode 1998AJ....115..648R, doi:10.1086/300200.
  3. distance × sin( diameter_angle / 2 ) = 15 ly. radius
  4. "SIMBAD Astronomical Object Database", Results for Palomar 1,, retrieved 2006-11-17.
  5. Abell, George O. (1955). "Globular Clusters and Planetary Nebulae Discovered on the National Geographic Society-Palomar Observatory Sky Survey". Publications of the Astronomical Society of the Pacific 67 (397): 258. Bibcode 1955PASP...67..258A. doi:10.1086/126815.
  6. 6.0 6.1 van den Bergh, Sidney; Mackey, A. D. (2004). "Globular clusters and the formation of the outer Galactic halo". Monthly Notices of the Royal Astronomical Society 354 (3): 713–719. arXiv:astro-ph/0407346. Bibcode 2004MNRAS.354..713V. doi:10.1111/j.1365-2966.2004.08228.x.

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