GGCs database: globular cluster NGC 6637

Release 11.12 ("Hergest Ridge")

Selected: NGC 6637

Parameters
Positional Parameters
cluster	NGC 6637
name	M 69
RA	18 31 23.10
Declination	-32 20 53.1
Galactic longitude	1.72
Galactic latitude	-10.27
R sun	8.8
R gc	1.7
X	8.6
Y	0.3
Z	-1.6
Photometric Parameters
E (B-V)	0.18
V HB	15.98
(m-M)	15.28
Vt	7.64
MVt	-7.64
(U-B)	0.48
(B-V)	1.01
(V-R)	0.62
(V-I)	1.28
S_RR	0
HBR	-1
hbt	7
Structural Parameters
[Fe / H]	-0.64
SpT	G2/3
v_r	39.9
err	2.8
v_LSR	47.5
c	1.38
r_c	0.33
r_h	0.84
r_t	8.35
lg(tc)	8.15
lg(th)	8.82
mu_V	16.82
rho_v	3.84
Color-magnitude diagrams
author	Heasley, J. N.; Janes, K. A.; Zinn, Robert; Demarque, Pierre; Da Costa, Gary S.; Christian, Carol A.
title	Hubble Space Telescope Photometry of the Metal-rich Globular Clusters NGC 6624 and NGC 6637
journal	The Astronomical Journal, Volume 120, Issue 2, pp. 879-893 (2000)
CM diagram
Credits	CMD 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 (0 comments in the database at the moment)
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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Query processed at 21:10, 19th April
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