Terzan 12

Globular Cluster Terzan 12, in Sagittarius

RA:
18:12:15.8
Dec:
-22:44:31
Distance from Sun:
15.6 kly
Distance from Galactic Center:
11.1 kly
Apparent Diameter:
3.1 arc min
Brightness:
15.63 mag vis
Radial Velocity:
+94.1 +/- 1.5 km/s
Diameter:
ly
Abs. Mag:
-4.14 Mag vis
Discovered by Terzan in 1971.

This globular is sometimes listed as Terzan 11 (e.g., in Barbara Wilson's webpage), as the original Terzan 11 turned out to be identical to Terzan 5. However, as W.E. Harris pointed out in his notes to the 1996 edition of his Catalog of Parameters for Milky Way Globular Clusters (and already in his earlier, 1994 version), it is just this ambiguity which might cause confusion. Unfortunately, the designation "Terzan 12" had been wrongly applied to a totally innocent and different cluster, NGC 6256. Therefore, the original designation Terzan 12 should be kept for this globular.

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References


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