Release 11.12 ("Hergest Ridge")


Selected: M 22

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Parameters
Positional Parameters
clusterNGC 6656
nameM 22
RA18 36 23.94
Declination-23 54 17.1
Galactic longitude9.89
Galactic latitude-7.55
R sun3.2
R gc4.9
X3.2
Y0.6
Z-0.4
Photometric Parameters
E (B-V)0.34
V HB14.15
(m-M)13.6
Vt5.1
MVt-8.5
(U-B)0.28
(B-V)0.98
(V-R)0.68
(V-I)1.42
S_RR7.2
HBR0.91
hbt2
Structural Parameters
[Fe / H]-1.7
SpT F5
v_r-146.3
err0.2
v_LSR-136.6
c1.38
r_c1.33
r_h3.36
r_t28.97
lg(tc)8.53
lg(th)9.23
mu_V17.42
rho_v3.63
Color-magnitude diagrams
authorSamus, N.; Kravtsov, V.; Pavlov, M.; Alcaino, G.; Liller, W.
titleA new photographic color-magnitude study of M22 = NGC 6656.
journalAstron. Astrophys. Suppl. 109, 487-499 (1995)
CM diagram
CreditsCMD 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
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 )
Paper n. 2
Samus, N.; Kravtsov, V.; Pavlov, M.; Alcaino, G.; Liller, W.
A new photographic color-magnitude study of M22 = NGC 6656.
1995, Astron. Astrophys. Suppl. 109, 487-499 (1995)
(NGC 6656 cmd )
See all items (2 papers) :: Submit a paper
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