Release 11.12 ("Hergest Ridge")


Selected: NGC 6218

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Parameters
Positional Parameters
clusterNGC 6218
nameM 12
RA16 47 14.18
Declination-01 56 54.7
Galactic longitude15.72
Galactic latitude26.31
R sun4.8
R gc4.5
X4.2
Y1.2
Z2.1
Photometric Parameters
E (B-V)0.19
V HB14.6
(m-M)14.01
Vt6.7
MVt-7.31
(U-B)0.2
(B-V)0.83
(V-R)0.56
(V-I)1.14
S_RR0
HBR0.97
hbt1
Structural Parameters
[Fe / H]-1.37
SpT F8
v_r-41.4
err0.2
v_LSR-27.9
c1.34
r_c0.79
r_h1.77
r_t17.6
lg(tc)8.19
lg(th)8.87
mu_V18.1
rho_v3.23
Color-magnitude diagrams
authorSato, Takashi; Richer, Harvey B.; Fahlman, Gregory G.
titleDeep CCD photometry in globular clusters. VIII - M12
journalAstronomical 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 11:15, 26th September
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