Messier 70 information

Messier 70
Messier 70
	Globular cluster Messier 70 by Hubble Space Telescope; 3.3′ view
Observation data (J2000 epoch)
Class	V
Constellation	Sagittarius
Right ascension	18h 43m 12.76s
Declination	–32° 17′ 31.6″
Distance	29.4 kly (9.0 kpc)
Apparent magnitude (V)	7.9
Apparent dimensions (V)	8.0′
Physical characteristics
Mass	1.79×105 M☉
Radius	34 ly
Tidal radius	11.2′
Metallicity	= –1.35 dex
Estimated age	12.80 Gyr
Other designations	GCl 101, M70, NGC 6681
	See also: Globular cluster, List of globular clusters

Messier 70 or M70, also known as NGC 6681, is a globular cluster of stars to be found in the south of Sagittarius.^[a] It was discovered by Charles Messier in 1780.^[b]^[6] The famous comet Hale–Bopp was discovered near this cluster in 1995.^[10]^[c]

It is about 29,400^[4] light years away from Earth and around 6,500 light-years^[11] from the Galactic Center. It is roughly the same size and luminosity as its neighbour in space, M69.^[12] M70 has a very small core radius of 0.22 ly (0.068 pc)^[13] and a half-light radius of 182.0 ly (55.80 pc).^[14] This cluster has undergone core collapse, leaving it centrally concentrated^[15] with the luminosity distribution following a power law.^[11]

There are two distinct stellar populations in the cluster, with each displaying unique abundance abundances. These likely represent different generations of stars.^[16] Five known variable stars lie within the broadest radius, the tidal radius, of it, all of which are RR Lyrae variables.^[8]^[17] The cluster may have two blue stragglers near the core.^[11]

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Messier 70 information

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