The Butterfly Cluster (cataloged as Messier 6 or M6, and as NGC 6405) is an open cluster of stars in the constellation of Scorpius. Its name derives from the vague resemblance of its shape to a butterfly.
The first astronomer to record the Butterfly Cluster’s existence was Giovanni Battista Hodierna in 1654. However, Robert Burnham, Jr has proposed that the 1st century astronomer Ptolemy may have seen it with the naked eye while observing its neighbor the Ptolemy Cluster(M7). Charles Messier catalogued the cluster as M6 in 1764. It was not till the 20th century that star counts, distance, and other properties were measured.
Imaging telescopes or lenses: Takahashi TOA 150
Imaging cameras: Canon EOS 5D Mark II MOD
Mounts: Takahashi EM-400 Temma2
Guiding telescopes or lenses: Vixen FL70S
Guiding cameras: Fishcamp Starfish
Focal reducers: Takahashi TOA 67 Flattener
Software: DeepSkyStacker, Adobe Photoshop CS3
Dates: July 1, 2011
Locations: Mt. Ho-Huan (Taiwan)
Integration: 0.8 hours
Autor: Wei-Hao Wang
03 March 2014
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