David's Astronomy Pages
Notes - Session 512 (2012-08-03)

2012-08-03
Bullet Impact of having an up-to-date flat field on final image (M101)
 
Bullet Images from 2012-08-03 >>

Impact of having an up-to-date flat field on final image quality (M101)

 
Annotated CCD Image  of M101 with with supernova 2011fe  (Ursa Major)
(58% size, cropped)
5 x 60 sec exposure (average combine), 3x3 binning, C Filter 
2012-08-03 22:26 h UT  (#512215-19)
12" LX200R  (at f/9.7) + ST-10XME
 
Left hand image with out of date flat field
(two particular artifact are noticeable due 
to altered or invalid dust motes )
Right hand image with updated flat field
(improvement in image is noticeable)
Image   Image
Image Image
Old Master Flat (50% size)
3x3 binning, C Filter, 17 x 1.5s (Av. Median) , S491
New Master Flat (50% size)
3x3 binning, C Filter, 21 x 1.5s (Av. Median), S515

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