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Messier 70

Coordinates: Sky map 18h 43m 12.64s, −32° 17′ 30.8″
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Messier 70
M70 from Hubble Space Telescope; 3.32′ view
Credit: NASA/STScI/WikiSky
Observation data (J2000 epoch)
ClassV[1]
ConstellationSagittarius
Right ascension18h 43m 12.76s[2]
Declination–32° 17′ 31.6″[3]
Distance29.4 kly (9.0 kpc)[4]
Apparent magnitude (V)+9.06[3]
Apparent dimensions (V)8′.0
Physical characteristics
Mass1.79×105[4] M☉
Radius34 ly[5]
Metallicity = –1.35[6] dex
Estimated age12.80 Gyr[6]
Other designationsM70, NGC 6681, GCl 101[3]
See also: Globular cluster, List of globular clusters

Messier 70 (also known as M70 or NGC 6681) is a globular cluster in the constellation Sagittarius. It was discovered by Charles Messier in 1780.

M70 is at a distance of about 29,300 light years away from Earth and close to the Galactic Center. It is roughly the same size and luminosity as its neighbour in space, M69. Only two variable stars are known within this cluster.

  • Picture obtained with the Wide Field Camera of Hubble’s Advanced Camera for Surveys. The field of view is around 3.3 by 3.3 arcminutes.[7]
    Picture obtained with the Wide Field Camera of Hubble’s Advanced Camera for Surveys. The field of view is around 3.3 by 3.3 arcminutes.[7]
  • Map showing location of M70 (Roberto Mura)
    Map showing location of M70 (Roberto Mura)

References

  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. ^ 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. ^ a b c "SIMBAD Astronomical Object Database". Results for NGC 6681. Retrieved 17 November 2006.
  4. ^ a b 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. ^ distance × sin( diameter_angle / 2 ) = 34 ly. radius
  6. ^ 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.{{citation}}: CS1 maint: unflagged free DOI (link)
  7. ^ "Tight and Bright". ESA/Hubble Picture of the Week. Retrieved 13 April 2012.
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