NGC 1261

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NGC 1261
Ngc 1261.jpg
NGC 1261 from Hubble Legacy Archive
Observation data (J2000.0 epoch)
Class II[1]
Constellation Horologium
Right ascension 03h 12m 16.21s[2]
Declination –55° 12′ 58.4″[2]
Distance 53.5 kly (16.4 kpc)[3]
Apparent magnitude (V) 8.3
Apparent dimensions (V) 12.9′
Physical characteristics
Mass 3.41×105[4] M
Metallicity  = –1.08[5] dex
Estimated age 10.24 Gyr[5]
Other designations GCL 5, ESO 155-SC11, Caldwell 87
See also: Globular cluster, List of globular clusters

NGC 1261, also known as Caldwell 87, is a globular cluster in the constellation Horologium, first discovered by James Dunlop in 1826.


  1. ^ Shapley, Harlow; Sawyer, Helen B. (August 1927), "A Classification of Globular Clusters", Harvard College Observatory Bulletin (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, Bibcode:2010AJ....140.1830G, arXiv:1008.2755Freely accessible, 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. 
  4. ^ Boyles, J.; et al. (November 2011), "Young Radio Pulsars in Galactic Globular Clusters", The Astrophysical Journal, 742 (1): 51, Bibcode:2011ApJ...742...51B, arXiv:1108.4402Freely accessible, 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, Bibcode:2010MNRAS.404.1203F, arXiv:1001.4289Freely accessible, doi:10.1111/j.1365-2966.2010.16373.x. 

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