M51a/b (Whirlpool Galaxy)
A reminder of how it used to be …
Equipment:
Refractor, 132 mm aperture, 928 mm focal length
TMB Flattener 68
Starlight Xpress SXVR-H18 (Kodak KAF8300 sensor)
Starlight Xpress 2” Filter Wheel (Baader filters)
Starlight Xpress Lodestar off-axis guider
Skywatcher NEQ6 mount
Software: (Windows 7)
Maxim DL 5.24, ASCOM drivers
EQMOD
PixInsight (Mac OSX), Photoshop CS6
Exposure: (LRGB)
L bin 1; 23 × 300 seconds, RGB bin 2; 20 × 200 seconds each
The Whirlpool Galaxy is a popular target for astronomers. It is a perfect jewel in the sky; measuring only about 10 arc minutes square, it is especially intriguing ...
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