M81 22 April 2004

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Subject	M81
Date	22nd April 2004
Telescope or Lens	TEC APO 140
Mount	G11
Camera	ST2000XM
Filters	TT LRGB and Hutech LPR
Total Exposures	L	150 min	R	60 min	G	40 min	B	40 min
Sub exposure	6 x 10 min 12 x 5 min 10 x 3 min		12 x 5 min		8 x 5 min		8 x 5 min
Binning	Luminance 1x1 RGB 2x2
Field of view and resolution	Approx 41x 31 Arcminute. 1.56 Arcsec / Pixel

Comments

Comments.
A variety of exposure lengths were taken in luminance to allow the fainter detail to be captured and to ensure the core was not burned out. Seperate processed images could then be produced so that the core and outer regions could be blended together. Camera temperature was set to -31 deg C and guided using the ST2000XM guide chip.