Subject:
Comet 96P/Machholz 1
Date:
11 April 2007, 04:07 to 04:18 UT
Camera:
Canon 10D DSLR
Equipment:
Televue 85 APO scope
Televue x0.8 field flattener
Losmandy GM8 mount
Losmandy Gemini goto computer
Location:
AstroAdventures, Kimworthy, Devon
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Exposures:
9 x 30 seconds ISO 800
7 x 20 seconds ISO 800
For dark calibration:
11 x 30 seconds ISO 800 min/max excluded averaged,
8 x 20 seconds ISO 800 min/max excluded averaged
For flat field calibration:
8 x 1/180 sec ISO 100 min/max excluded averaged
Daylight sky through two white cotton layers
Images Plus:
Converted to TIFF (Daylight WB)
Calibrated (master dark, master flat)
Aligned
Stacked (min/max excluded average)
Digital Development Processing
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Photoshop:
Levels
Curves
Colour balance and saturation
Focus:
DSLRFocus software
Notes:
Comet was very low in bright twilight. Exposures needed adjusting to
compensate brightening sky. Comet was approx 1 degree above the horizon
close to a hedge/tree line in the distance. Also the effect of atmospheric
refraction caused some stars low to the horizon to appear trailed. Twilight
sky gradient left intact
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