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 | To find out what the pixel intensity values mean, I compared my exposures to the Palomar Digital Sky Survey plates. Here is a 1-degree view centered on Vega.
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| I overlayed and aligned one of the frames and found that my field of view was approximately 0.6 x 0.4 degrees (36 x 24 arcminutes).
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| I next overlayed a map from my charting software (Starry Night 2). Only a few identified objects were within the frame.
By examining the intensities for the two SAO objects in the full frame from the exposures where it was not saturated and not in the noise, I could estimate the photometric scale. It is very crude however, the peak pixel value from a deblurred image is only roughly related to the photometric energy. Averaging across exposures, it was enough to estimate the magnitudes of the two stars immediately adjacent to Vega. Star "a" (near diffraction axis) is the brighter, at about mag 9. Star "b" is roughly magnitude 10.
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