Messier 7

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Messier 7
Messier7.jpg
Observation data (J2000.0 epoch)
ConstellationScorpius
Richt ascension17h 53m 51.2s[1]
Declination–34° 47′ 34″[1]
Distance980 ± 33 ly (300 ± 10 pc)[2]
Apparent magnitude (V)3.3
Apparent dimensions (V)80.0′
Pheesical chairactereestics
Mass735[3] M
Radius25 ly
Estimatit age200 Myr[2]
Ither designationsM7, NGC 6475, Ptolemy Cluster
See an aw: Appen cluster, Leet o appen clusters

Messier 7 or M7, an aw designatit NGC 6475 an whiles kent as the Ptolemy Cluster,[4] is an appen cluster o starns in the constellation o Scorpius.

References[eedit | eedit soorce]

  1. 1.0 1.1 "MESSIER 007", NASA/IPAC Extragalactic Database, NASA, retrieved 2012-04-19 
  2. 2.0 2.1 Villanova, S.; Carraro, G.; Saviane, I. (September 2009), "A spectroscopic study of the open cluster NGC 6475 (M 7). Chemical abundances from stars in the range Teff = 4500-10 000 K", Astronomy and Astrophysics, 504 (3): 845–852, arXiv:0906.4330Freely accessible, Bibcode:2009A&A...504..845V, doi:10.1051/0004-6361/200811507 
  3. Piskunov, A. E.; et al. (January 2008), "Tidal radii and masses of open clusters", Astronomy and Astrophysics, 477 (1): 165–172, Bibcode:2008A&A...477..165P, doi:10.1051/0004-6361:20078525 
  4. Gendler, Robert; Christensen, Lars Lindberg; Malin, David (2011), Treasures of the Southern Sky: A Photographic Anthology, Springer, p. 139, ISBN 978-1461406273 

Coordinates: Sky map 17h 53.9m 00s, −34° 49′ 00″