NGC 6642 is a globular cluster located 26,700 light-years from Earth,[2] in the constellation Sagittarius. Many "blue stragglers" (stars which seemingly lag behind in their rate of aging) have been spotted in this globular, and it is known to be lacking in low-mass stars.[4]

During the June 2094 lunar eclipse, a total lunar eclipse, it will be occulted by the Moon over New Guinea, Northern Australia and the Pacific Ocean.[5]: 161 

References

  1. ^ "SIMBAD query results". SIMBAD Astronomical Database. Retrieved 6 February 2012.
  2. ^ a b Oliveira, R. A. P.; Ortolani, S.; Barbuy, B.; Kerber, L. O.; Maia, F. F. S.; Bica, E.; Cassisi, S.; Souza, S. O.; Pérez-Villegas, A. (2022). "Precise distances from OGLE-IV member RR Lyrae stars in six bulge globular clusters". Astronomy & Astrophysics. 657: A123. arXiv:2110.13943. Bibcode:2022A&A...657A.123O. doi:10.1051/0004-6361/202141596. S2CID 239998638.
  3. ^ 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, S2CID 118649860.
  4. ^ Balbinot, E.; Santiago, B. X.; Bica, E.; Bonatto, C. (1 July 2009). "The globular cluster NGC 6642: evidence for a depleted mass function in a very old cluster". Monthly Notices of the Royal Astronomical Society. 396 (3): 1596–1602. arXiv:0903.4325. Bibcode:2009MNRAS.396.1596B. doi:10.1111/j.1365-2966.2009.14819.x. S2CID 15354065.
  5. ^ Meeus, Jan (2002). "Occultations of deep-sky objects during a total lunar eclipse". More Mathematical Astronomy Morsels (PDF). pp. 157–162. ISBN 0943396743.
  • Media related to NGC 6642 at Wikimedia Commons



Allikas: http://en.wikipedia.org/wiki/NGC_6642
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