Release 11.12 ("Hergest Ridge")


Selected: NGC 6838

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Parameters
Positional Parameters
clusterNGC 6838
nameM 71
RA19 53 46.49
Declination+18 46 45.1
Galactic longitude56.75
Galactic latitude-4.56
R sun4
R gc6.7
X2.2
Y3.4
Z-0.3
Photometric Parameters
E (B-V)0.25
V HB14.48
(m-M)13.8
Vt8.19
MVt-5.61
(U-B)0.63
(B-V)1.09
(V-R)0.63
(V-I)1.36
S_RR0
HBR-1
hbt7
Structural Parameters
[Fe / H]-0.78
SpT G1
v_r-22.8
err0.2
v_LSR-7.5
c1.15
r_c0.63
r_h1.67
r_t8.96
lg(tc)7.54
lg(th)8.43
mu_V19.75
rho_v2.83
Color-magnitude diagrams
authorHodder, Philip J. C.; Nemec, James M.; Richer, Harvey B.; Fahlman, Gregory G.
titleDeep CCD photometry and variable stars in the metal-rich globular cluster M71
journalAstronomical Journal, vol. 103, Feb. 1992, p. 460
CM diagram
Description of NGC 6838

Messier 71 (also known as M71 or NGC 6838) is a globular cluster in the constellation Sagitta. It was discovered by Philippe Loys de Cheseaux in 1746 and included by Charles Messier in his catalog of comet-like objects in 1780. It was also noted by Koehler at Dresden around 1775.

M71 is at a distance of about 12,000 light years away from Earth and spans some 27 light years across. The irregular variable star Z Sagittae is a member of this cluster.

M71 was long thought (until the 1970s) to be a densely packed open cluster and was classified as such by leading astronomers in the field of star cluster research due to its lacking a dense central compression (..) However, modern photometric photometry has detected a short "horizontal branch" in the H-R diagram of M71, which is characteristic of a globular cluster.

Source: Wikipedia | Notify inaccuracies

Image

Image of the cluster from the Digital Sky Survey

Other Resources
for NGC 6838
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; Carney, Bruce W.; Balachandran, Suchitra C.
Infrared Echelle Spectroscopy of Palomar 6 and M71
2004, The Astronomical Journal, Volume 128, Issue 5, pp. 2388-2401
(Pal 6 NGC 6838 )
Paper n. 2
Grundahl, F.; Stetson, P. B.; Andersen, M. I.
The ages of the globular clusters M 71 and 47 Tuc from Strömgren uvby photometry. Evidence for high ages
2002, Astronomy and Astrophysics, v.395, p.481-497
(NGC 6838 NGC 104 )
Paper n. 3
Hodder, Philip J. C.; Nemec, James M.; Richer, Harvey B.; Fahlman, Gregory G.
Deep CCD photometry and variable stars in the metal-rich globular cluster M71
1992, Astronomical Journal, vol. 103, Feb. 1992, p. 460
(NGC 6838 cmd )
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