NGC 6539 information

NGC 6539
NGC 6539
	Globular cluster NGC 6539
Observation data (J2000 epoch)
Class	X:
Constellation	Serpens
Right ascension	18h 04m 49.74s
Declination	–07° 35′ 09.1″
Distance	26.63 kly (8.165 kpc)
Apparent magnitude (V)	9.6
Apparent dimensions (V)	6.9′
Physical characteristics
Absolute magnitude	−8.21
Mass	5.36×105 M☉
Metallicity	= −0.66 dex
Other designations	GCL 85
	See also: Globular cluster, List of globular clusters

NGC 6539, or GCL 85, is a globular cluster of stars in the constellation Serpens. It was discovered by Danish astronomer Theodor Brorsen in 1856.^[6]^[7] This cluster is visible with a small amateur telescope, having an apparent visual magnitude of 9.6 and an angular size of 6.9″.^[4] It is located at a distance of 26.63 kly (8.165 kpc) from the Sun,^[3] and 10 kly (3.1 kpc) from the Galactic Center.^[2]

This cluster is located in the outer parts of the Galactic bulge. There is a large dark cloud complex located in the fore of this cluster, causing reddening from extinction.^[8] NGC 6539 has a core radius of 0.54′, a half-mass radius of 1.67′, and a tidal radius of 21.5′. Compared to other globular clusters, NGC 6539 is considered metal rich, indicating that it has a relatively higher abundance of elements more massive than helium. Thirteen variable stars have been detected within 7′ of the core, of which a dozen are long period variables.^[9] A millisecond pulsar was discovered in 1990.^[10]

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NGC 6539 information

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NGC 6539

List of most massive star clusters

Theodor Brorsen

Red Square Nebula

1856 in science

IC 4756

Melotte catalogue

List of globular clusters

Epsilon Serpentis

Mu Serpentis

Xi Serpentis

Omega Serpentis

NGC 6027d

NGC 6027c

Beta Serpentis

NGC 6027a

Nu Serpentis

NGC 6027b

Psi Serpentis

NGC 6027e

Sigma Serpentis

Palomar 5

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Chi Serpentis

Pi Serpentis

NGC 6509

Upsilon Serpentis

NGC 6818

NGC 6539
Globular cluster NGC 6539
Observation data (J2000 epoch)
Class	X:^[1]
Constellation	Serpens
Right ascension	18^h 04^m 49.74^s^[2]
Declination	–07° 35′ 09.1″^[2]
Distance	26.63 kly (8.165 kpc)^[3]
Apparent magnitude (V)	9.6^[4]
Apparent dimensions (V)	6.9′^[4]
Physical characteristics
Absolute magnitude	−8.21^[2]
Mass	5.36×10⁵^[5] `M`_☉
Metallicity	${\begin{smallmatrix}\left[{\ce {Fe}}/{\ce {H}}\right]\end{smallmatrix}}$ = −0.66^[2] dex
Other designations	GCL 85
See also: Globular cluster, List of globular clusters