Butterfly Cluster, M 6, NGC 6405

Object: Open Cluster

Constellation: Scorpius

Apparent Magnitude: 4.2

Est. Distance: 1600 ly

Telescope: Celestron CPC 800 (8")

Camera: Nikon D70 unmodified

Exposure: 1x30 sec (0.5 mins)

ISO: 1600

Date: 2nd June 2008

Wikipedia link

Annotated Version