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Butterfly Cluster (M6, NGC 6405)





Butterfly Cluster (M6, NGC 6405)
Credit: AURA, NOAO, NSF
An open cluster in the constellation Scorpius, 4° northwest of M7 (Ptolemy's Cluter), that contains about 80 stars roughly in the shape of a butterfly. Visible to the naked eye, it was first noted by Giovanni Hodierna before 1654. Its most conspicuous star is an orange giant K star of magnitude 6.2.


visual magnitude 5.3
angular size 25'
diameter 20 light-years
age about 50 million years
distance 2,000 light-years
position R.A.17h 40.1m, Dec. -32° 13'


Related categories

   • NEBULAE AND STAR CLUSTERS
   • MESSIER CATALOGUE