David's Astronomy Pages CCD Image Notes - Session 90 (2005-08-05)

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Sky Condition Graph

Sky Condition Graphs for Observing Sessions S90

Notice  1)  2)  3)

See explanation of these graphs

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Temporary Frost Effect in CCD Camera

During cooling of CCD Camera in preparation for taking a series of Flat Frames, a strange sequence of CCD Flat Images were acquired which showed the appearance and then gradual disappearance of Frost, as the CCD Camera was cooled below freezing point (from am ambient temperature of around +20 degC to a planned stablised temperature of -5 degC).  This may indicate the build-up of moisture in the CCD Camera and as a precaution the Desiccator in the camera will be regenerated before the next observing session.

Sequence of 2x2 binned images  (Images at Normal Size)

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