NGC 6642

NGC 6642
Image of NGC 6642 was created from visible and infrared images taken with the Wide Field Channel of the Advanced Camera for Surveys. Credit: ESA/Hubble & NASA
Observation data (J2000 epoch)
Right ascension	18^h 31^m 54.23^s^[1]
Declination	−23° 28′ 34.1″
Distance	26.4 kly (8.1 kpc)^[2]
Apparent dimensions (V)	48"
Physical characteristics
Mass	7005109000000000000♠1.09×10⁵^[2] M_☉
Metallicity	${\begin{smallmatrix}\left[{\ce {Fe}}/{\ce {H}}\right]\end{smallmatrix}}$ = –1.26^[2] dex
Other designations	C 1828-235, ESO 522-32, GCl 97, Mel 203

NGC 6642 is a globular cluster located 26,400 light years from Earth. 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.^[3]

References

↑ "SIMBAD query results". SIMBAD Astronomical Database. Retrieved 6 February 2012.
1 2 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.
↑ 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.

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Astronomical catalogs

NGC	NGC 6637 NGC 6638 NGC 6639 NGC 6640 NGC 6641 NGC 6642 NGC 6643 NGC 6644 NGC 6645 NGC 6646 NGC 6647

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

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