Release 11.12 ("Hergest Ridge")


Selected: NGC 6717

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Parameters
Positional Parameters
clusterNGC 6717
namePal 9
RA18 55 06.04
Declination-22 42 05.3
Galactic longitude12.88
Galactic latitude-10.9
R sun7.1
R gc2.4
X6.8
Y1.6
Z-1.3
Photometric Parameters
E (B-V)0.22
V HB15.55
(m-M)14.94
Vt9.28
MVt-5.66
(U-B)0.35
(B-V)1
(V-R)0.65
(V-I)1.37
S_RR5.4
HBR0.98
hbt1
Structural Parameters
[Fe / H]-1.26
SpT F6
v_r22.8
err3.4
v_LSR32.7
c2.07
r_c0.08
r_h0.68
r_t9.87
lg(tc)6.52
lg(th)8.22
mu_V16.77
rho_v4.58
Color-magnitude diagrams
author Ortolani, S.; Barbuy, B.; Bica, E.
titleColour-magnitude diagrams of the post-core collapse globular clusters NGC 6256 and NGC 6717 (Palomar 9)
journalAstronomy and Astrophysics Supplement, v.136, p.237-243 (1999)
CM diagram
CreditsCMD from Padova database
Description of NGC 6717

Discovered by William Herschel on August 7, 1784.

William Herschel discovered this cluster and cataloged it as H III.143. He described it as a very faint round nebula and apparently thought it was a cluster with nebulosity. It was first recognized as globular cluster by Per Collinder in 1931. When compiling his catalog of newly discovered globular clusters, George Abell (1955) included this object, apparently unaware of its identity, as it was not previously classified as a globular cluster. Its identification with NGC 6717 was probably done in 1958 by Alter.

It is of historical interest that a stellar lump in this cluster was cataloged separately as IC 4802 on the grounds of its observation by Bigourdan around 1900 (Bigourdan 434).

Source: SEDS.org | Notify inaccuracies

Image

Image of the cluster from the Digital Sky Survey

Other Resources
for NGC 6717
Globular Clusters Blog
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
Ortolani, S.; Barbuy, B.; Bica, E.
Colour-magnitude diagrams of the post-core collapse globular clusters NGC 6256 and NGC 6717 (Palomar 9)
1999, Astronomy and Astrophysics Supplement, v.136, p.237-243 (1999)
(NGC 6717 cmd NGC 6256 )
Paper n. 2
Hazen-Liller, M. L.
Photoelectric sequences near nine galactic globular clusters
1984, Astronomical Journal, vol. 89, p. 1551-1554
(NGC 6139 NGC 6355 NGC 6453 NGC 6496 NGC 6558 NGC 6569 NGC 6642 NGC 6652 NGC 6717 )
See all items (2 papers) :: Submit a paper
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Query processed at 20:42, 28th July
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Page updated: 2013-04-17



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