NGC 6231
Open Cluster NGC 6231
= Dunlop 499 = Melotte 153 = Collinder 315), type ‘e’,
in Scorpius
Right Ascension | 16 : 54.0 (h:m) |
---|---|
Declination | -41 : 48 (deg:m) |
Distance | 5.9 (kly) |
Visual Brightness | 2.6 (mag) |
Apparent Dimension | 15 (arc min) |
NGC 6231 has been one of the discoveries of
published in his 1654 catalog in Palermo, but forgotten until its rediscovery in
the early 1980s. It was independently rediscovered by Philippe Loys De
Cheseaux 1745-46 and by Abbe Lacaille in 1751-52.
This cluster is extremely young, and was estimated only about 3.2 million years
old. Its hottest star is of spectral type O8 and magnitude 4.71, according to the
Sky Catalog 2000. It is approaching us at 22 km/sec.
Astronomical League’s Southern Sky Binocular Club List.
Last Modification: 8 Mar 1998, 20:05 MET