M 6 – NGC 6405


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The Butterfly Cluster contains about 80 stars distributed unevenly across a 50 arcmin area. Its brightest stars occupy, however, a smaller 20-25 arcmin area. It is seen against a rich starry background in Scorpius (angularly close to the galactic center). Its brightest star, BM Sco, mag +6.0 is a variable red star (5.5-7.0). Most stars are blue (type B4-B5).

Additional Information


Name(s): M6, NGC 6405, The Butterfly Cluster

Type: Open Cluster

RA:  17h 40m 19s

Dec: -32º 14’ 54”

Constellation: Scorpius

Size (arcmin): 25×25

Magnitude: +4.2

Distance: 1,600


Date: 2013-07-29

Location: Corbera de Llobregat, Barcelona, Catalonia

Size (arcmin): 37×27

Telescope: Celestron 11″ HD f/10

Camera: FLI ML6303 (3072x2048pix)

Guiding: Orion SSAG/Nikkor 500mm f/8

Total exposure: 13 min (L: 3 min; RGB: 10min)

Processing: PixInsight

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