NEBULAE & STAR CLUSTERS
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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



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