Re: Updating RA/DEC fits headers with true location?

[Michael Koppelman <lolife@bitstream.net>]

There is always WCSTools, too:

http://tdc-www.harvard.edu/software/wcstools/

Michael

On Aug 24, 2004, at 9:50 AM, Arne Henden wrote:

> If you have the transformations to calculate RA,DEC from a given x,y
> then you just use those equations with the center pixel as input.
> It sounds like you are one step earlier, though; having matched
> a set of stars with known RA,DEC and with CCD x,y how do you
> determine the transformation?  I'd suggest looking at the
> astrometry chapter in Berry/Burnell, The Handbook of Astrnomical
> Image Processing, Willmann-Bell.  Good book to own in any case.
> There is a nice set of routines in slalib to do the math.
> Arne