[AstroPy] Bug in wcs_world2pix?

[Thomas Robitaille]

I think the coordinates are exactly 180 degrees off - that is, (31, 26)
is the exact antipode of (211, -26). So it seems that there is still an
issue? If the RA got wrapped, it would be (-149, -26).

Cheers,
Tom

Michael Droettboom wrote:
> The range of ra and dec is (-180, 180) and (-90, 90) respectively.  
> (211, -26) is equivalent to (31, 26).
> 
> Mike
> 
> On 09/18/2014 05:04 PM, Maik Riechert wrote:
>> Hi,
>>
>> I'm having some great trouble currently and am a bit confused too:
>>
>> wcs = WCS(header)
>> x,y = wcs.wcs_world2pix(211, -26, 0)
>> print x,y # 836.316942718 658.26364248
>> ra,dec = wcs.wcs_pix2world(x, y, 0)
>> print ra, dec # 31.0 26.0
>>
>> It seems like world2pix gives me bogus results. I was expecting values
>> way outside my image area (image size is 4256x2832). Am I doing
>> something obvious wrong?
>>
>> The WCS headers can be seen at http://pastebin.com/JrdiL949
>>
>> Thanks for the help,
>> Maik
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> 
>