3C461 Cassiopeia A in [SII], Halpha and [OIII] from Stinger 450 Classical Cassegrain and FLI CM10 Maxcam with Custom Scientific Narrowband Emission Line Filters

22 hours

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17 hours

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Taken on Sept 10, 13, 29 and October 1, 2, 5 and 6, 2007 from my backyard in Castro Valley, California

Red = [SII] 

Green = Halpha

Blue = [OIII]

Stinger 450 Classical Cassegrain (18" f/12.6)  

Lumicon Giant Easy Guider with Focal reducer for final: F= 3366mm, f/7.1

(image scale = 0.42 arc-sec/pixel at capture)

Finger Lakes CM10 MaxCam imaging camera operated at -25C

Robofocus

Finger Lakes CFW1 Filter wheel

SBIG ST7E guide camera

Custom Scientific 4.5nm FWHM Ha filter (50mm diameter)

Custom Scientific 4.5nm FWHM [OIII] filter (50mm diameter)

Custom Scientific 4.5nm FWHM [SII] filter (50mm diameter)

15 exposures of 30 minutes through Halpha filter

14 exposures of 30 minutes through [OIII]

15 exposures of 30 minutes through [SII]

22 hours total exposure time