Reply To: Software for photometry (image calibration)

[Grant Privett]

I’m no expert, but I don’t recall seeing A_ORDER, AP_ORDER, CTYPE1/2 or CRPIX1/2 in any FITS file that I had not plate solved. I think they all relate to parameters defining how the x/y pixel location is related to the RA/Dec value associated.

Its a polynomial, usually, so the comments about polynomial order are suggestive. 🙂

• This reply was modified 8 months, 2 weeks ago by Grant Privett.