Astronomy:NGC 6304

NGC 6304
Observation data (J2000.0 epoch)
Class	VI
Constellation	Ophiuchus
Right ascension	17h 14m 32.25s
Declination	−29° 27′ 43.3″
Distance	19.2 kly
Apparent magnitude (V)	9.03
Apparent dimensions (V)	3.8'
Physical characteristics
VHB	16.25
Metallicity	[math]\displaystyle{ \begin{smallmatrix}\left[\ce{Fe}/\ce{H}\right]\end{smallmatrix} }[/math] = -0.45 dex
Estimated age	~12.3 Gyr
Other designations	Bennett 90,; C 1711-294,; ESO 454-2,; ESO 454-SC 002,; GC 4275,; GCl 56,; h 3670,; I 147,; NGC 6304,; VDBH 216
	See also: Globular cluster, List of globular clusters

Short description: Globular cluster in the constellation Ophiuchus

NGC 6304 is a globular cluster in the constellation Ophiuchus. William Herschel discovered this star cluster using an 18.5-inch (47 cm) f/13 speculum reflector telescope in 1786.^[3] It is about 19,000 light-years away, near the Milky Way's central bulge.^[7]

Globular cluster NGC 6304, by HST (WFC3).

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NGC 6304

Observation data (J2000.0^[1] epoch)
Class	VI ^[2]
Constellation	Ophiuchus^[3]
Right ascension	17^h 14^m 32.25^s ^[1]
Declination	−29° 27′ 43.3″ ^[1]
Distance	19.2 kly ^[2]
Apparent magnitude (V)	9.03 ^[1]
Apparent dimensions (V)	3.8'
Physical characteristics
V_HB	16.25 ^[4]
Metallicity	[math]\displaystyle{ \begin{smallmatrix}\left[\ce{Fe}/\ce{H}\right]\end{smallmatrix} }[/math] = -0.45 ^[4] dex
Estimated age	~12.3 Gyr^[5]
Other designations	Bennett 90,^[3] C 1711-294,^[1] ESO 454-2,^[1] ESO 454-SC 002,^[6] GC 4275,^[3] GCl 56,^[1] h 3670,^[3] I 147,^[3] NGC 6304,^[1] VDBH 216^[1]
See also: Globular cluster, List of globular clusters