click image to enlarge
Shot in my backyard in Castro Valley, Ca on December 1, 2004
Compact Collapsible Cassegrain 18" @f/12.60 (F=5760mm)
IMG6303E camera @-42C
AO7 @ 25Hz
RCOS Dichroic beam splitter
ST7E guide camera
FLI CFW1 Filter wheel
Custom Scientific 3nm Halpha filter
5 exposures of 20 minutes through Custom Scientific Ha filter (binned 1x1)
Image scale = 0.32 arc-sec/pixel
Compare with the Faulkes 2M Hawaii Telescope image:
http://www.blackskies.com/pnweek1.htm
December 3, 2004:
[NII] and [OIII] added under poor seeing conditions (FWHM ~3.9-4.1 arc-sec)
3 exposures of 20 minutes through Custom Scientific [NII] filter (binned 1x1)
4 exposures of 20 minutes through Custom Scientific [OIII] filter (binned 1x1)
Ha= Red, [NII] = Green, [OIII] = Blue, click to enlarge
[NII] = Red, Ha = Green, [OIII] = Blue, click to enlarge
Ha = Red, [NII] = Green, [NII] = Blue, click to enlarge
Splitting Ha and [NII] lines (separated by 2nm!)