Hello all,
I have noticed something unusual that has me confused about the output of the solve-field command. When I run the command in my Ubuntu terminal, I get my expected output which includes the RA and Dec of the field center, like so:
Field center: (RA, Dec) = (187.178070, 56.716414) deg.
(this is for apod4 in the demo files btw)
But when I open the WCS header file generated by the solve, apod4.wcs, I don't see these values anywhere. Instead, I see:
CRVAL1 = 174.256985357 / RA of reference point
I originally assumed that the reference point was the field center-- but it looks like the coordinates of the reference point are given in the WCS header as:
CRPIX1 = 304.683069865 / X reference pixel
CRPIX2 = 102.908372879 / Y reference pixel
Is there a reason why this is chosen as the reference point and why the RA and Dec are given for this point instead? And is there a simple way to find the RA and Dec of the field center from these values? (The image height and width are IMAGEH= 507 pixels and IMAGEW= 719 pixels).
Thanks in advance for your help understanding this.
-Aaron