[AstroPy] Proper Motions in astropy.coordinates

[gonghang.naoc]

I have a similar question. Is there any other package about PM calculation?
Thank you.
Hang

On Sun, May 10, 2015 at 5:24 PM, Josh Walawender <jmwalawender at gmail.com>
wrote:

> Hi all,
>
> Is there a method do calculations of proper motions in
> astropy.coordinates?  It looks to me as if the SkyCoord has obstime and
> equinox properties but how would I transform from a coordinate defined for
> a particular obstime and equinox to another obstime (e.g. for the same
> equinox)?
>
> I just did this calculation in a brute force way (multiplying the proper
> motion in mas/yr by number of years and adding that angle to the ra and dec
> independently), but it felt like there should be a better way.
>
> thanks!
> Josh
>
>
> _______________________________________________
> AstroPy mailing list
> AstroPy at scipy.org
> http://mail.scipy.org/mailman/listinfo/astropy
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/astropy/attachments/20150512/b70597a2/attachment.html>