NGC 6642 information

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.
Observation data (J2000 epoch)
Constellation	Sagittarius
Right ascension	18h 31m 54.23s
Declination	−23° 28′ 34.1″
Distance	26.7 ± 2.3 kly (8.2 ± 0.7 kpc)
Apparent dimensions (V)	48"
Physical characteristics
Mass	1.09×105 M☉
Metallicity	= –1.26 dex
Other designations	Cr 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]

^ "SIMBAD query results". SIMBAD Astronomical Database. Retrieved 6 February 2012.
^ ^a ^b Cite error: The named reference Oliveira was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference apj742_1_51 was invoked but never defined (see the help page).
^ Cite error: The named reference mnras266_257 was invoked but never defined (see the help page).

[simbad-1] "SIMBAD query results". SIMBAD Astronomical Database. Retrieved 6 February 2012.

[Oliveira-2] Cite error: The named reference Oliveira was invoked but never defined (see the help page).

[apj742_1_51-3] Cite error: The named reference apj742_1_51 was invoked but never defined (see the help page).

[mnras266_257-4] Cite error: The named reference mnras266_257 was invoked but never defined (see the help page).

NGC 6642 information

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NGC 6642

Herschel 400 Catalogue

List of globular clusters

Melotte catalogue

Nu1 Sagittarii

Nu Sagittarii

Xi Sagittarii

Collinder catalogue

Beta Sagittarii

Chi1 Sagittarii

Kappa2 Sagittarii

NGC 6509

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Beta1 Sagittarii

HD 165185

Kappa Sagittarii

Theta Sagittarii

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Rho1 Sagittarii

Beta2 Sagittarii

HD 167665

Kappa1 Sagittarii

Theta2 Sagittarii

NGC 6782

Iota Sagittarii

Xi2 Sagittarii

Theta1 Sagittarii

Nu2 Sagittarii

HD 182681