Astronomy:NGC 6642

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NGC 6642
File:250px
Image of NGC 6642 was created from visible and infrared images taken with the Wide Field Channel of the Advanced Camera for Surveys.
Observation data (J2000 epoch)
ClassV?
ConstellationSagittarius
Right ascension 18h 31m 54.23s[1]
Declination−23° 28′ 34.1″
Distance26.7 ± 2.3 kly (8.2 ± 0.7 kpc)[2]
Apparent dimensions (V)48"
Physical characteristics
Mass1.09×105[3] M☉
Metallicity[Fe/H] = –1.26[3] dex
Other designationsCr 381, C 1828-235, ESO 522-32, GCl 97, Mel 203
See also: Globular cluster, List of globular clusters

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. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=NGC+6642. 
  2. ↑ 2.0 2.1 Oliveira, R. A. P.; Ortolani, S.; Barbuy, B.; Kerber, L. O.; Maia, F. F. S.; Bica, E.; Cassisi, S.; Souza, S. O. et al. (2022). "Precise distances from OGLE-IV member RR Lyrae stars in six bulge globular clusters". Astronomy & Astrophysics 657: A123. doi:10.1051/0004-6361/202141596. Bibcode: 2022A&A...657A.123O. 
  3. ↑ 3.0 3.1 Boyles, J. et al. (November 2011), "Young Radio Pulsars in Galactic Globular Clusters", The Astrophysical Journal 742 (1): 51, doi:10.1088/0004-637X/742/1/51, Bibcode: 2011ApJ...742...51B. 
  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. doi:10.1111/j.1365-2966.2009.14819.x. Bibcode: 2009MNRAS.396.1596B. 
  5. ↑ Meeus, Jan (2002). "Occultations of deep-sky objects during a total lunar eclipse". More Mathematical Astronomy Morsels. pp. 157-162. ISBN 0943396743. https://falakmu.id/khgt/dokumen/More%20mathematical%20astronomy%20morsels%20(Jean%20Meeus)%20(Z-Library).pdf. 

Coordinates: Sky map 18h 31m 54.23s, −23° 28′ 34.1″




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