[AstroPy] using astropy.coordinates.angular_separation()

[John ZuHone]

Hi Pierre,

I should note that you are looking at the page for the "stable" version of AstroPy, which is 5.3.1, whereas you are using a very old version of AstroPy, for which the docs are here:

https://docs.astropy.org/en/v2.0.16/coordinates/index.html#module-astropy.coordinates
Based on my casual look, this method is not in this old version. If you can, I highly recommend upgrading to the latest version, which also necessitates upgrading to Python 3. 

Best,

John

> On Aug 10, 2023, at 11:58 AM, Didelon Pierre <pierre.didelon at cea.fr> wrote:
> 
> 
> Hi everyone
> 
> I hope I am not disturbing you with a silly question :-/
> 
> I try to use the astropy.coordinates.angular_separation() utility 
> (https://docs.astropy.org/en/stable/api/astropy.coordinates.angular_separation.html)
> in python2.7 with  astropy 2.0.16 
> but it seems not available :-/
> 
> here is the code
> 
> import astropy.coordinates as ac
> ...
> angsep = ac.angular_separation (pix_c_coord[0]*pi/180.,pix_ra*pi/180.,pix_c_coord[1]*pi/180.,pix_dec*pi/180.) *180./pi 
> 
> and the error 
> 
> angsep = ac.angular_separation (pix_c_coord[0]*pi/180.,pix_ra*pi/180.,pix_c_coord[1]*pi/180.,pix_dec*pi/180.) *180./pi 
> AttributeError: 'module' object has no attribute 'angular_separation'
> 
> Did I miss something?
> 
> Tank's in advance for any advice
> 
> Pierre Didelon
> 
> Astrophysic Department CEA Saclay
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