Palomar 6

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Palomar 6
Palomar 6.jpg
Observation data (J2000 epoch)
Class XI
Constellation Ophiuchus
Right ascension 17h 43m 42.20s [1]
Declination −26° 13′ 21.0″ [1]
Distance 25.02 ± 0.62  kly (7.67 ± 0.19  kpc) [2]
Physical characteristics
Mass2.28×105 [3]   M☉
Metallicity  = –0.91 [3] dex
Estimated age12.4 ± 0.9 Gyr [2]
Other designationsESO 520-21, GCl 75, 1740-262 [1]
See also: Globular cluster, List of globular clusters

Palomar 6 is a loose globular cluster in the constellation Ophiuchus that belongs to the Milky Way galaxy. It is a member of the Palomar Globular Clusters group and is located about 25,000 light-years (7,700 parsecs) away from the Sun. [2] It formed in what would become the bulge of the Milky Way and is similar to other old-bulge globular clusters such as Messier 62, NGC 6522, NGC 6558, and Haute-Provence 1. [2]

First discovered on the National Geographic Society – Palomar Observatory Sky Survey plates by Robert G. Harrington and Fritz Zwicky, [4] it was catalogued as a globular cluster, and was thought to be one of four globulars known to contain a planetary nebula. A paper published in 2024, however, showed that the proper motion of the central star of the nebula JaFu 1 differs from that of the cluster with high statistical significance, thus confirming that the nebula is not located within the cluster. [5]

References

  1. 1 2 3 "SIMBAD Astronomical Database". Results for Palomar 6. Retrieved 2009-10-04.
  2. 1 2 3 4 Souza, S. O.; Valentini, M.; Barbuy, B.; Pérez-Villegas, A.; Chiappini, C.; Ortolani, S.; Nardiello, D.; Dias, B.; Anders, F.; Bica, E. (2021). "Photo-chemo-dynamical analysis and the origin of the bulge globular cluster Palomar 6". Astronomy & Astrophysics. 656: A78. arXiv: 2109.04483 . Bibcode:2021A&A...656A..78S. doi:10.1051/0004-6361/202141768. S2CID   237485386.
  3. 1 2 Boyles, J.; et al. (November 2011), "Young Radio Pulsars in Galactic Globular Clusters", The Astrophysical Journal, 742 (1): 51, arXiv: 1108.4402 , Bibcode:2011ApJ...742...51B, doi:10.1088/0004-637X/742/1/51, S2CID   118649860.
  4. ↑ 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 .
  5. ↑ Bond, Howard E.; Bellini, Andrea; Sahu, Kailash C. (2024-09-17). "Testing Cluster Membership of Planetary Nebulae with High-precision Proper Motions. I. HST Observations of JaFu 1 Near the Globular Cluster Palomar 6". The Astronomical Journal. 168 (4): 160. arXiv: 2407.18135 . Bibcode:2024AJ....168..160B. doi: 10.3847/1538-3881/ad67d4 . ISSN   1538-3881.
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