GGCs database: globular cluster NGC 6656

Release 11.12 ("Hergest Ridge")

Selected: NGC 6656

Parameters
Positional Parameters
cluster	NGC 6656
name	M 22
RA	18 36 23.94
Declination	-23 54 17.1
Galactic longitude	9.89
Galactic latitude	-7.55
R sun	3.2
R gc	4.9
X	3.2
Y	0.6
Z	-0.4
Photometric Parameters
E (B-V)	0.34
V HB	14.15
(m-M)	13.6
Vt	5.1
MVt	-8.5
(U-B)	0.28
(B-V)	0.98
(V-R)	0.68
(V-I)	1.42
S_RR	7.2
HBR	0.91
hbt	2
Structural Parameters
[Fe / H]	-1.7
SpT	F5
v_r	-146.3
err	0.2
v_LSR	-136.6
c	1.38
r_c	1.33
r_h	3.36
r_t	28.97
lg(tc)	8.53
lg(th)	9.23
mu_V	17.42
rho_v	3.63
Color-magnitude diagrams
author
title
journal
CM diagram
Credits	CMD from Padova database

Description of NGC 6656
Messier 22 (also known as M22 or NGC 6656) is an elliptical globular cluster in the constellation Sagittarius near the Galactic bulge region. It is one of the brightest globulars that is visible in the night sky. M22 was one of the first globulars to be discovered in 1665 by Abraham Ihle and it was included in Charles Messier's catalog of comet-like objects on June 5, 1764. Source: Wikipedia \| Notify inaccuracies
Image
Image of the cluster from the Digital Sky Survey
Other Resources for NGC 6656

ADS "Object Search"
SEDS data
Web Links for this cluster (2 links in the database at the moment)
Users comments for this cluster (0 comments in the database at the moment)
Selected biblio
Paper n. 1
Lee, Jae-Woo Multiple Stellar Populations of Globular Clusters from Homogeneous Ca by Photometry. I. M22 (NGC 6656) 2015, The Astrophysical Journal Supplement Series, Volume 219, Issue 1, 36 pp. (NGC 6656 )
Paper n. 2
Kunder, Andrea et al. The RR Lyrae Variables and Horizontal Branch of NGC 6656 (M22) 2013, The Astronomical Journal, Volume 146, Issue 5, 15 pp. (NGC 6656 )
Paper n. 3
Lynch, Ryan S. et al. Six New Recycled Globular Cluster Pulsars Discovered with the Green Bank Telescope 2011, The Astrophysical Journal, Volume 734, Issue 2, article id. 89, 8 pp. (NGC 6517 NGC 6656 )
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Query processed at 00:39, 17th April
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