WCS question
Doug Mink
dmink at cfa.harvard.edu
Thu Nov 5 14:51:11 EST 1998
Greg Hennessy wrote:
>
> I am working on producing a set of images on CDROM that will have
> astrometry according to the Greisen and Calabretta A&A 1996 paper, but
> the four allowed values for RADECSYS are two for FK4, one FK5, and one
> geocentric apparent place. The images I will be working on are
> reduced against the ACT catalog. Are there any conventions to what
> RADECSYS should be for this? I would assume 'HIP' but would like some
> advice.
We talked about this at ADASS, and there was some agreement that the
RADECSYS for Tycho- and ACT- (and Hipparcos-) based images could be
HIPPARCOS (spelled out). Pat Wallace has subroutines which convert
between the Hipparcos system and J2000, and I will be adding them
to my WCSTools package as soon as I get them from him.
-Doug Mink
WCSTools developer ( http://tdc-www.harvard.edu/software/wcstools/ )
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