On February 25, 2009 Ceres will be the closest to the Earth for the next 1000 years. Reason the more to try to image the dwarf planet. With its 0.83" it has the size of the theoretical resolution of an 11 inch telescope. As a comparison I used Denebola. Despite the fact that collimation was not perfect, the disk of Ceres is clearly visible.
Atmospheric conditions: Seeing 7/10, Transparancy 8/10
Telescope :Celestron C11 with Televue 3x Barlow and Astronomik RGB filters
Camera:DMK21AU4.AS
Exposure time: 1/5 sec; gain 100%; gamma 40%; per color 2x 2 min exposures total of 980 frames
Processing:Registax 4.0 and finally per color 500 best frames stacked
The resulting three images (R, G and B) were combined with Astroart and the final result polish with Photoshop CS2
[スセンバッハ:オランダ]
[John Sussenbach:Houten,Netherlands]
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