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The Butterfly

GenitiveHerculis
AbbreviationHer
Right Ascension16h31 to 17h16
Declination+21° 27' to +38° 53'
Area (sq deg)95
Brightest StarKornephoros
Optimum VisibilityJune
NotesAn asterism of northern spring and summer skies, composed of six relatively bright stars within the constellation of Hercules. The Butterfly's northern wing consists of the four stars of the Keystone at the heart of Hercules, while the edge of the southern wing is delineated by Kornephoros and Sarin.

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