Updating RA/DEC fits headers with true location?

[Robert Creager <Robert_Creager@LogicalChaos.org>]

Hey folks,

I need to start updating my fits headers with true RA/DEC location so manually
viewing the images is actually useful.

So, I have a bunch of stars with known astrometric positions (RA/DEC) and known
frame positions (x,y).  I'm sure there is a 'proper' way to calculate the
center of the image, but I'm not much on spherical geometry yet.

I know using a simple interpolation solution would get me close, as would
finding the closes two stars too the center of the x,y positions, provided the
image wasn't rotated much (which could be accounted for).  But, I figure there
is a better way.

Anyone?

Thanks,
Rob

-- 
 08:10:55 up 9 days, 18:33,  3 users,  load average: 2.49, 2.19, 2.05
Linux 2.6.5-02 #8 SMP Mon Jul 12 21:34:44 MDT 2004

PGP signature