[AstroPy] fits coordinate system keyword

[Perry Greenfield]

That’s somewhat arguable. Say in 1990 I had a header with 

PC1_1 = “BOZO”

That would have been legal. After the WCS standard was accepted, it would have been illegal.

Perry

On Oct 5, 2015, at 3:20 PM, Paul Kuin <npkuin at gmail.com> wrote:

> Actually, one of the basic tenets of FITS is to be completely backward compatible, so any keyword that was valid in the past is valid now. So that warning is also inaccurate. If it was standard, it still is, and ever will be. 
> 
> 
> 
> On Mon, Oct 5, 2015 at 5:25 PM, Erik Bray <embray at stsci.edu> wrote:
> On 10/05/2015 12:17 PM, Paul Kuin wrote:
> 
> 
> I am getting very annoyed of the warning that keeps popping up
> 
> WARNING: FITSFixedWarning: RADECSYS= 'FK5' / default
> RADECSYS is non-standard, use RADESYSa. [astropy.wcs.wcs]
> 
> I'm not sure when the FITS standard changed, but MOST legacy fits files (I use)
> will have the RADECSYS keyword. It works, and I do not see why someone felt the
> need to keep this warning being popped up all the time.
> 
> Probably as a warning to remind authors of new files that they shouldn't be using that keyword.  I don't know that it necessarily needs to be displayed every time reading in a WCS except maybe to head off cases of ambiguity.  But I don't know this particular issue well enough to be sure if the warning is appropriate in all cases or not.
> 
> I think that by default it should be off.
> 
> Since you all probably think it should be there, I would like to know how to
> turn it off ?  any suggestion on how to do that?
> 
> http://docs.astropy.org/en/stable/warnings.html
> 
> 
> Erik
> 
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