NGC 3201 information

NGC 3201
NGC 3201
	NGC 3201 by Hubble Space Telescope; 3.5′ view
Observation data (J2000 epoch)
Class	X
Constellation	Vela
Right ascension	10h 17m 36.82s
Declination	–46° 24′ 44.9″
Distance	16.3 kly (5.0 kpc)
Apparent magnitude (V)	+8.24
Apparent dimensions (V)	18.2′
Physical characteristics
Mass	1.57×105 M☉
Radius	40 ly
VHB	14.77
Metallicity	= –1.24 dex
Estimated age	12.2±0.5 Gyr
Other designations	GCl 15, GC 2068, h 3238, Dun 445, Bennett 44, Caldwell 79, Melotte 99
	See also: Globular cluster, List of globular clusters

NGC 3201 (also known as Caldwell 79) is a low galactic latitude globular cluster in the southern constellation of Vela. It has a very low central concentration of stars.^[10] This cluster was discovered by James Dunlop on May 28, 1826 and listed in his 1827 catalogue. He described it as "a pretty large pretty bright round nebula, 4′ or 5′ diameter, very gradually condensed towards the centre, easily resolved into stars; the figure is rather irregular, and the stars are considerably scattered on the south".^[11]

The radial velocity of this cluster is unusually high at 490 km/s, larger than any other cluster known. This corresponds to a peculiar velocity of 240 km/s. While high, this is lower than the escape velocity of the Milky Way galaxy.^[11] It is located at a distance of 16,300 light years from the Sun and has an estimated 157,000 times the mass of the Sun.^[5] This cluster is about 10.24 billion years old.^[7]

The stellar population of this cluster is inhomogeneous, varying with distance from the core. The effective temperature of the stars shows an increase with greater distance, with the redder and cooler stars tending to be located closer to the core. As of 2010, this is one of only two clusters (including Messier 4) that shows a definite inhomogeneous population.^[12]

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^ distance × sin( diameter_angle / 2 ) = 40 ly. radius
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^ Monty, Stephanie; Puzia, Thomas H.; Miller, Bryan W.; Carrasco, Eleazar R.; Simunovic, Mirko; Schirmer, Mischa; Stetson, Peter B.; Cassisi, Santi; Venn, Kim A.; Dotter, Aaron; Goudfrooij, Paul; Perina, Sibilla; Pessev, Peter; Sarajedini, Ata; Taylor, Matthew A. (2018), "The GeMS/GSAOI Galactic Globular Cluster Survey (G4CS). I. A Pilot Study of the Stellar Populations in NGC 2298 and NGC 3201", The Astrophysical Journal, 865 (2): 160, arXiv:1808.05271, Bibcode:2018ApJ...865..160M, doi:10.3847/1538-4357/aadb43, S2CID 119089142
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[6] stance × sin( diameter_angle / 2 ) = 40 ly. radius

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[8] Monty, Stephanie; Puzia, Thomas H.; Miller, Bryan W.; Carrasco, Eleazar R.; Simunovic, Mirko; Schirmer, Mischa; Stetson, Peter B.; Cassisi, Santi; Venn, Kim A.; Dotter, Aaron; Goudfrooij, Paul; Perina, Sibilla; Pessev, Peter; Sarajedini, Ata; Taylor, Matthew A. (2018), "The GeMS/GSAOI Galactic Globular Cluster Survey (G4CS). I. A Pilot Study of the Stellar Populations in NGC 2298 and NGC 3201", The Astrophysical Journal, 865 (2): 160, arXiv:1808.05271, Bibcode:2018ApJ...865..160M, doi:10.3847/1538-4357/aadb43, S2CID 119089142

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NGC 3201 information

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