NGC 6541

NGC 6541 (also known as Caldwell 78) is a globular cluster in the southern constellation of Corona Australis. It is estimated to be around 14 billion years old.[6]

NGC 6541
Caldwell 78 (50291821361).jpg
NGC 6541, imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
ClassIII[1]
ConstellationCorona Australis
Right ascension18h 08m 02.36s[2]
Declination–43° 42′ 53.6″[2]
Distance22.8 kly (7.0 kpc)[3]
Apparent magnitude (V)6.3
Apparent dimensions (V)15′
Physical characteristics
Absolute magnitude-8.52
Mass5.72×105[4] M
Metallicity = –1.53[5] dex
Estimated age12.93 Gyr[5]
Other designationsCaldwell 78
See also: Globular cluster, List of globular clusters

The globular cluster was discovered by Niccolò Cacciatore at the Palermo Astronomical Observatory, Sicily, on March 19, 1826. It was independently found by James Dunlop on July 3, 1826.

The cluster is relatively small, having just 94 blue straggler stars.[7]

NGC 6541

ReferencesEdit

  1. ^ Shapley, Harlow; Sawyer, Helen B. (August 1927), "A Classification of Globular Clusters", Harvard College Observatory Bulletin, 849 (849): 11–14, Bibcode:1927BHarO.849...11S.
  2. ^ a b 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.
  3. ^ Paust, Nathaniel E. Q.; et al. (February 2010), "The ACS Survey of Galactic Globular Clusters. VIII. Effects of Environment on Globular Cluster Global Mass Functions", The Astronomical Journal, 139 (2): 476–491, Bibcode:2010AJ....139..476P, doi:10.1088/0004-6256/139/2/476, hdl:2152/34371.
  4. ^ 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.
  5. ^ a b Forbes, Duncan A.; Bridges, Terry (May 2010), "Accreted versus in situ Milky Way globular clusters", Monthly Notices of the Royal Astronomical Society, 404 (3): 1203–1214, arXiv:1001.4289, Bibcode:2010MNRAS.404.1203F, doi:10.1111/j.1365-2966.2010.16373.x.
  6. ^ O'Meara, Stephen James (2011). Deep-Sky Companions: The Secret Deep. Cambridge, United Kingdom: Cambridge University Press. p. 322. ISBN 978-0521198769.
  7. ^ The "UV-route" to search for blue straggler stars in globular clusters: first results from the HST UV Legacy Survey, 2017, arXiv:1704.01453

External linksEdit

Coordinates:   18h 08m 02s, −43° 53′ 00″