pm doesn't work

[obscure666]

Routine pm doesn't seem to work. No motion is applied.

Example:
import palpy
In [11]: palpy.pm(0., 0., 5., 5., 0., 0., 2000., 2010.)
Out[11]: (0.0, 0.0)

[danielsf]

It looks like you have set parallax==0.0. Try a non-zero parallax. I have a note in my code that "palpy.pm does not work properly if parallax is below 0.00045 arcseconds"

[danielsf]

The comments in palPm.c (which underlies palpy's pm method) say

*  Notes:
*     - Uses eraStarpm but ignores the status returns from that routine.
*       In particular note that parallax should not be zero when the
*       proper motions are non-zero. SLA/F allows parallax to be zero.
*     - Assumes all epochs are Julian epochs.