NGC 6440

Globular cluster in the constellation of Sagittarius

NGC 6440
The globular cluster NGC 6440 imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
Class	V
Constellation	Sagittarius
Right ascension	17^h 48^m 52.7^s^[1]
Declination	−20° 21′ 36.9″^[1]
Distance	27.7 kly (8.5 kpc)^[2]
Apparent magnitude (V)	10.10^[2]
Physical characteristics
Radius	3.15' x 3.15'^[1]
Metallicity	${\begin{smallmatrix}\left[{\ce {Fe}}/{\ce {H}}\right]\end{smallmatrix}}$ = -0.36^[3] dex
Other designations	GCl 77, 1FGL J1748.7-2020, MXB 1746-20^[2]
See also: Globular cluster, List of globular clusters

NGC 6440 is a globular cluster in the constellation Sagittarius discovered by William Herschel on 28 May 1786. It has an apparent magnitude of around 10, with a diameter of about 6 arcminutes, and its Shapley–Sawyer Concentration Class is V.^[1]

References

^ ^a ^b ^c ^d "NGC 6440". Retrieved 19 December 2019.
^ ^a ^b ^c "NGC 6440". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 8 January 2017.
^ "A Galactic Globular Clusters Database: NGC 6440". Retrieved 8 January 2017.