Release 11.12 ("Hergest Ridge")


Selected: NGC 6637

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Parameters
Positional Parameters
clusterNGC 6637
nameM 69
RA18 31 23.10
Declination-32 20 53.1
Galactic longitude1.72
Galactic latitude-10.27
R sun8.8
R gc1.7
X8.6
Y0.3
Z-1.6
Photometric Parameters
E (B-V)0.18
V HB15.98
(m-M)15.28
Vt7.64
MVt-7.64
(U-B)0.48
(B-V)1.01
(V-R)0.62
(V-I)1.28
S_RR0
HBR-1
hbt7
Structural Parameters
[Fe / H]-0.64
SpTG2/3
v_r39.9
err2.8
v_LSR47.5
c1.38
r_c0.33
r_h0.84
r_t8.35
lg(tc)8.15
lg(th)8.82
mu_V16.82
rho_v3.84
Color-magnitude diagrams
authorHeasley, J. N.; Janes, K. A.; Zinn, Robert; Demarque, Pierre; Da Costa, Gary S.; Christian, Carol A.
titleHubble Space Telescope Photometry of the Metal-rich Globular Clusters NGC 6624 and NGC 6637
journalThe Astronomical Journal, Volume 120, Issue 2, pp. 879-893 (2000)
CM diagram
CreditsCMD from Padova database
Description of NGC 6637

Messier 69 (also known as M69 or NGC 6637) is a globular cluster in the constellation Sagittarius. It was discovered by Charles Messier in August 31, 1780, the same night he discovered M70. At the time, he was searching for an object described by LaCaille in 1751-2 and thought he had rediscovered it, but it is unclear if LaCaille actually described M69.

M69 is at a distance of about 29,700 light-years away from Earth and has a spatial radius of 42 light-years. It is a close neighbor of Globular Cluster M70, 1,800 light-years separating the two objects, and both these clusters lie close to the Galactic Center.

Source: Wikipedia | Notify inaccuracies

Image

Image of the cluster from the Digital Sky Survey

Other Resources
for NGC 6637
ADS "Object Search"
SEDS data
Web Links for this cluster
(1 link in the database at the moment)
Users comments for this cluster
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Selected biblio
Paper n. 1
Heasley, J. N.; Janes, K. A.; Zinn, Robert; Demarque, Pierre; Da Costa, Gary S.; Christian, Carol A.
Hubble Space Telescope Photometry of the Metal-rich Globular Clusters NGC 6624 and NGC 6637
2000, The Astronomical Journal, Volume 120, Issue 2, pp. 879-893 (2000)
(NGC 6637 cmd )
Paper n. 2
Hartwick, F. D. A.; Sandage, A.
The Color-Magnitude Diagram for the Abnormally Strong-Line Globular Cluster M69
1968, Astrophysical Journal, vol. 153, p.715
(NGC 6637 )
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