NGC 6712

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NGC 6712
NGC 6712 439 555 675 814 Wiki.jpg
NGC 6712, by HST
Observation data (J2000 epoch)
Class IX:[1]
Constellation Scutum
Right ascension 18h 53m 04.32s[2]
Declination –08° 42′ 21.5″[2]
Distance 22.5 kly (6.9 kpc)[3]
Apparent magnitude (V) +8.69[2]
Apparent dimensions (V) 7.2'
Physical characteristics
Mass 9.4×104[4] M
Metallicity  = –0.94[5] dex
Estimated age 10.4 Gyr[5]
Other designations GCl 103,[2] GC 4441
See also: Globular cluster, List of globular clusters

NGC 6712 is a globular cluster that was probably discovered by Le Gentil on July 9, 1749 when investigating the Milky Way star cloud in Aquila. He described it as a "true nebula," in contrast to the open star cluster M11. Independently discovered by William Herschel on June 16, 1784 and cataloged as H I.47; he also first classified it as a round nebula. John Herschel was the first to describe it as a globular star cluster during his observations in the 1830s.

References[edit]

  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 c d "SIMBAD Astronomical Database". Results for NGC 6712. Retrieved 2006-11-16.
  3. ^ 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.
  4. ^ Marks, Michael; Kroupa, Pavel (August 2010), "Initial conditions for globular clusters and assembly of the old globular cluster population of the Milky Way", Monthly Notices of the Royal Astronomical Society, 406 (3): 2000–2012, arXiv:1004.2255, Bibcode:2010MNRAS.406.2000M, doi:10.1111/j.1365-2966.2010.16813.x. Mass is from MPD on Table 1.
  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.

External links[edit]

Coordinates: Sky map 18h 53m 04.32s, −08° 42′ 21.5″