Butterfly Cluster
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The Butterfly Cluster is an open cluster of stars in the southern constellation of Scorpius. Its name derives from the vague resemblance of its shape to a butterfly. The Trumpler classification of II 3 r encodes it is rich in stars, ranks II out... Wikipedia
Apparent magnitude (V): 4.2
Apparent dimensions (V): 25′
Constellation: Scorpius
Declination: −32° 13′
Distance: 1.59 kly (0.487 kpc)
Right ascension: 17h 40.1m
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