NGC 6440

NGC 6440
	The globular cluster NGC 6440 ; Credit: HST
Observation data (J2000 epoch)
Class	V
Constellation	Sagittarius
Right ascension	15h 28m 00.69s[1]
Declination	−20° 21′ 34.5″[1]
Distance	27.7 kly; (8.5 kpc)[1]
Apparent magnitude (V)	10.10[1]
Physical characteristics
Radius	3.15' x 3.15'[2]
Metallicity	= -0.36[3] dex
Other designations	GCl 77, 1FGL J1748.7-2020, MXB 1746-20[1]

NGC 6440 is a globular cluster in the constellation Sagittarius and was discovered by William Herschel on 28 May 1786. It has an apparent magnitude of about 10, with a diameter of about 6 arcminutes, and its Shapley–Sawyer Concentration Class is V.^[2]

References

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NGC 6440
The globular cluster NGC 6440 Credit: HST
Observation data (J2000 epoch)
Class	V
Constellation	Sagittarius
Right ascension	15^h 28^m 00.69^s^[1]
Declination	−20° 21′ 34.5″^[1]
Distance	27.7 kly (8.5 kpc)^[1]
Apparent magnitude (V)	10.10^[1]
Physical characteristics
Radius	3.15' x 3.15'^[2]
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^[1]