Night of 20120226 to 20120227
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Sum of images of M42 in H\alpha taken with the FSQ and the 6563/30 filter.

(656.3 nm and 3.0 nm bandwidth)

First exposure of 100 seconds was at 2012-02-27T02:09:17
Last expoosure was at 2012-02-27T03:23:50

Astrometry with astrometry.net

Images coadded in swarp for total equivalent exposure of 4100 seconds

png images with Python PIL and PYFITS