GGCs database: globular cluster NGC 6218

Release 11.12 ("Hergest Ridge")

Selected: NGC 6218

Parameters
Positional Parameters
cluster	NGC 6218
name	M 12
RA	16 47 14.18
Declination	-01 56 54.7
Galactic longitude	15.72
Galactic latitude	26.31
R sun	4.8
R gc	4.5
X	4.2
Y	1.2
Z	2.1
Photometric Parameters
E (B-V)	0.19
V HB	14.6
(m-M)	14.01
Vt	6.7
MVt	-7.31
(U-B)	0.2
(B-V)	0.83
(V-R)	0.56
(V-I)	1.14
S_RR	0
HBR	0.97
hbt	1
Structural Parameters
[Fe / H]	-1.37
SpT	F8
v_r	-41.4
err	0.2
v_LSR	-27.9
c	1.34
r_c	0.79
r_h	1.77
r_t	17.6
lg(tc)	8.19
lg(th)	8.87
mu_V	18.1
rho_v	3.23
Color-magnitude diagrams
author	Sato, Takashi; Richer, Harvey B.; Fahlman, Gregory G.
title	Deep CCD photometry in globular clusters. VIII - M12
journal	Astronomical Journal, vol. 98, Oct. 1989, p. 1335-1353
CM diagram

Description of NGC 6218
Messier 12 (also known as M12, Globular Cluster M12 or NGC 6218) is a globular cluster in the constellation Ophiuchus. It was discovered by Charles Messier on May 30, 1764. Located roughly 3 degrees from the cluster M10, M12 is about 16,000 light-years distant and has a spatial diameter of ~75 light-years. The brightest stars of M12 are of 12th magnitude. It is rather loosely packed for a globular and M12 was once thought to be a tightly concentrated open cluster. Thirteen variable stars have been recorded in this cluster. Source: Wikipedia \| Notify inaccuracies
Image
Image of the cluster from the Digital Sky Survey
Other Resources for NGC 6218
Globular Clusters Blog
ADS "Object Search"
C. Clement variables data
SEDS data
Google Sky
Web Links for this cluster (1 link in the database at the moment)
Users comments for this cluster (0 comments in the database at the moment)
Selected biblio
Paper n. 1
Sollima, A. et al. Searching in the dark: the dark mass content of the Milky Way globular clusters NGC288 and NGC6218 2016, MNRAS, Volume 462, Issue 2, p.1937-1951 (NGC 288 NGC 6218 )
Paper n. 2
Kamann, S.et al. The central dynamics of M3, M13, and M92: stringent limits on the masses of intermediate-mass black holes 2014, Astronomy & Astrophysics, Volume 566, A58, 24 pp. (NGC 5272 NGC 6218 NGC 6341 )
Paper n. 3
Johnson, Christian I.; Pilachowski, Catherine A. A Moderate Sample Size, Multielement Analysis of the Globular Cluster M12 (NGC 6218) 2006, The Astronomical Journal, Volume 132, Issue 6, pp. 2346-2359 (NGC 6218 )
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Query processed at 16:44, 3rd October
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