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Selected as NASA's Astronomy Picture of the Day for February 14, 2005
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Halpha only
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Taken on January 19, 2005 from my backyard in Castro Valley, Ca
Pentax Takumar 150mm f/2.8 medium format camera lens (stopped down to f/4)
ST10XME imaging camera (self guided) operated at -30C
Finger Lakes DF2 Digital Focuser
Finger Lakes CFW1 Filter wheel
AstroDon 6nm [OIII] and [SII] filter (50mm unmounted)
Custom Scientific 3nm Ha filter (50mm unmounted)
four exposures of 15 minutes for Halpha
four exposures of 10 minutes for [OIII] and [SII]
two hours 20 minutes total exposure time