NGC 6380, Tonantzintla 1
Globular Cluster NGC 6380 (Tonantzintla 1, Ton 1, Pismis 25),
Discovered by James Dunlop in 1826.
- Distance from Sun:
- 35.5 kly
- Distance from Galactic Center:
- 10.8 kly
- Apparent Diameter:
- 12.1 arc min
- 11.31 mag vis
- Radial Velocity:
- -3.6 +/- 2.5 km/s
- Abs. Mag:
- -7.50 Mag vis
Independently rediscovered by John Herschel on June 29, 1834.
This cluster was discovered by James Dunlop in 1826 from Paramatta,
Australia and cataloged by him as Dun 538. However, due to unknown reason,
Dunlop's discovery could not be verified by John Herschel, who independently
rediscovered this object from the Cape of Good Hope in 1834, and cataloged as
h 3688. Dunlop's discovery was eventually brought to light in the 1990s by
Glen Cozens of Australia.
For a long long time, NGC 6380 was thought to be just an open cluster.
Only in the 1950s, this object was found to be globular by A.D. Thackeray on
photographic plates obtained with the 74-inch telescope at Radcliffe
Observatory in the 1950s (see Sawyer Hogg 1959).
It was independently discovered once more by Paris Pismis, who cataloged it as
Tonantzintla 1 or Ton 1 (Pismis 1959); it was also
referred to as Pismis 25 on that occasion. In the same paper, Pismis also
announced a second new globular, Tonantzintla 2 or
Ton 2 - this was an original discovery.
- Helen B. Sawyer Hogg, 1959.
In: S. Flügge (ed.),
Handbuch der Physik [Encyclopedia of Physics], Vol. LIII (53):
Astrophysik IV: Stersysteme [Astrophysics IV: Stellar Systems],
Here: Appendix B, Catalogue of globular clusters, p. 204-206.
- Paris Pismis, 1959.
Nuevos cumulos estelares en regiones del sur.
Bol. Obs. Tonantzintla Tacub. 2, part no. 18, pp. 37-38
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