Wednesday, 1 October 2008

The Double Cluster

Object: NGC 884 & 869 (Caldwell 14)
Type: Open clusters
Distance: 7300 light years
Constellation: Perseus
Date: 16 December 2006
Equipment: SXV-H9, 400mm focal length Vixen guidescope
Subframes: 20 x 60s subframes in RGB, 16 darks, 16 flats/flat darks, calibrated and stacked in AIP4Win.

Note: Must refocus between red, green and blue filter changes as 400mm spotting scope is not well-corrected. Hence the bloated redder stars.


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