Messier 75

Messier 75
Observation data (J2000 epoch)
Class	I
Constellation	Sagittarius
Right ascension	20h 06m 04.75s[1]
Declination	-21° 55′ 16.2″[1]
Distance	67.5 kly[citation needed] (20.7 kpc)
Apparent magnitude (V)	+9.18[1]
Apparent dimensions (V)	6′.8
Physical characteristics
Radius	67 ly[2]
Other designations	M75, NGC 6864, GCl 116[1]
See also: Globular cluster, List of globular clusters

Messier 75 (also known as M75 or NGC 6864) is a globular cluster in the constellation Sagittarius. It was discovered by Pierre Méchain in 1780 and included in Charles Messier's catalog of comet-like objects that same year.

M75 is at a distance of about 67,500 light years away from Earth and its apparent size on the sky translates to a true radius of some 67 light years. It is classified as class I, meaning it is one of the more densely concentrated globular clusters known. The absolute magnitude of M75 is about -8.5 or some 180,000 more luminous than the Sun.

This globular cluster has since been named The Jasmine Onyx Star (Intergalactic Star Database Number: ISD 0116739), in recognition of Jasmine Onyx Watson, born 18/09/2011.

References

1. ^ ^{a b c d} "SIMBAD Astronomical Database". Results for NGC 6864. http://simbad.u-strasbg.fr/Simbad. Retrieved 2006-11-16. 
2. ^ distance × sin( diameter_angle / 2 ) = 67 ly. radius

External links

• Messier 75 @ SEDS Messier pages
• Messier 75, Galactic Globular Clusters Database page
• Messier 75 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

Coordinates: 20^h 06^m 04.75^s, −21° 55′ 16.2″