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

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

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


Subject:
Comet 2P/Encke

Date:
09 April 2007, 20:24 to 20:54 UT

Camera:
Canon 10D DSLR

Exposures:
10 x 1 minute ISO 800
9 x 2 minutes ISO 800

For dark calibration:
17 x 1 minute ISO 800 min/max excluded averaged,
11 x 2 minutes ISO 800 min/max excluded averaged

For flat field calibration:
16 x 1/250 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

Photoshop:
Levels
Curves
Colour balance and saturation

Equipment:
Televue 85 APO scope
Televue x0.8 field flattener
Losmandy GM8 mount
Losmandy Gemini goto computer

Focus:
DSLRFocus software

Location:
AstroAdventures, Kimworthy, Devon

Notes:
Comet was low in deep twilight. Exposures needed adjusting
to compensate darkening sky and deepening horizon extinction
Twilight sky gradient left intact

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