[daip] JMFIT reported values

[Bill Junor]

OK, that makes more sense.  I am at dec=+12, but with some rotation in 
the image.  I did look at help file but I didn't see this info.  Maybe I 
missed it?

Thanks.

    Bill


Eric Greisen wrote:
> SUSAN BILL WIDER wrote:
>>  
>> Eric, DAIP.
>>  
>>     I was using JMFIT in 31DEC08 AIPS to model a simple 2-d 
>> gaussian.   The component is compact, well-defined and has good SNR 
>> relative to the background.  In the deconvolution section of the 
>> report, the recovered values of the major and minor axes are given in 
>> both pixels and arcseconds, and the position angle (PA) in degrees.  
>> However, the PAs accompanying the pixel-scaled values and the 
>> astronomical angular values are different, and by significant amounts 
>> (e.g 20 degrees in a PA of 131 degrees).  Surely, the deconvolved PA 
>> is independent of whatever units I use to report the major and minor 
>> axes?  Or have I missed something here?
>>  
>>                                                                     
>> Bill Junor
>>
>>      
> The PA in pixels is wrt up in the image.  The PA in coordinate space is 
> wrt North.  If you are near the Noth pole these can be quite different 
> or if the image is rotated.
> 
> ERic Greisen
>