Release 11.12 ("Hergest Ridge")


Selected: NGC 6681

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Parameters
Positional Parameters
clusterNGC 6681
nameM 70
RA18 43 12.76
Declination-32 17 31.6
Galactic longitude2.85
Galactic latitude-12.51
R sun9
R gc2.2
X8.8
Y0.4
Z-2
Photometric Parameters
E (B-V)0.07
V HB15.55
(m-M)14.99
Vt7.87
MVt-7.12
(U-B)0.12
(B-V)0.72
(V-R)0.47
(V-I)0.99
S_RR2.9
HBR0.96
hbt1
Structural Parameters
[Fe / H]-1.62
SpT F5
v_r220.3
err0.9
v_LSR227.8
c2.5
r_c0.03
r_h0.71
r_t7.91
lg(tc)5.82
lg(th)8.65
mu_V14.25
rho_v5.82
Color-magnitude diagrams
authorMassari, D. et al.
titleHubble Space Telescope Absolute Proper Motions Of NGC 6681 (M70) and the Sagittarius Dwarf Spheroidal Galaxy
journalThe Astrophysical Journal, Volume 779, Issue 1, article id. 81, 9 pp.
CM diagram
CreditsCMD from Padova database
Description of NGC 6681

Messier 70 (also known as M70 or NGC 6681) is a globular cluster in the constellation Sagittarius. It was discovered by Charles Messier in 1780.

M70 is at a distance of about 29,300 light years away from Earth and close to the Galactic Center. It is roughly the same size and luminosity as its neighbour in space, Globular Cluster M69. Only 2 variable stars are known within this cluster.

Source: Wikipedia | Notify inaccuracies

Image

Image of the cluster from the Digital Sky Survey

Other Resources
for NGC 6681
ADS "Object Search"
SEDS data
Web Links for this cluster
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Users comments for this cluster
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Selected biblio
Paper n. 1
Massari, D. et al.
Hubble Space Telescope Absolute Proper Motions Of NGC 6681 (M70) and the Sagittarius Dwarf Spheroidal Galaxy
2013, The Astrophysical Journal, Volume 779, Issue 1, article id. 81, 9 pp.
(NGC 6681 cmd )
Paper n. 2
Watson, Alan M. et al.
Far-ultraviolet imaging of the globular cluster NGC 6681 with WFPC2
1994, Astrophysical Journal, Part 2 - Letters, vol. 435, no. 1, p. L55-L58
(NGC 6681 cmd )
Paper n. 3
Pryor, Carlton; McClure, Robert D.; Fletcher, J. M.; Hesser, James E.
Mass-to-light ratios for globular clusters. I - The centrally concentrated clusters NGC 6624, M28 (NGC 6626), and M70 (NGC 6681)
1989, Astronomical Journal, vol. 98, p. 596-610
(NGC 6626 NGC 6624 NGC 6681 NGC 6584 )
See all items (3 papers) :: Submit a paper
Listen to the sound of this cluster (info)

Tutor(s) for this cluster:
Davide Massari

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Query processed at 20:35, 30th March
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