Photometry in ASTAP version 2023.05.09
Stacking program, astrometric (plate) solver, fits file viewer
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Hello,
Because I had an old version of ASTAP (2021) I downloaded the latest (2023.05.09) today. When I tried to measure some old files for photometry I get the message below, but I don't have any results in the table. I get a questionmark for the magnitude of the variable star.
What do I wrong?
Using star database H18
23:31:04 Photometry calibration for EXTENDED OBJECTS successful. 162 Gaia stars used for flux calibration. Flux aperture diameter: measured star diameter. Coefficient of variation: 8,5%. Annulus inner diameter: 29 pixels. Stars with pixel values of 65532 or higher are ignored.
23:31:04 Photometric calibration is only valid if the filter passband is similar as the passband reference database. This is indicated by the coloured square icons
23:31:04 Limiting magnitude is 16,9 (16,9< m <16,9, SNR=7, aperture ⌀max)
kind regards,
Gunther
I found the answer. I was using DSS polynomial instead of WCS.
Gunther