[AstroPy] Proper Motions in astropy.coordinates

[Josh Walawender]

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

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