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danielsf avatar danielsf commented on August 14, 2024

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"

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danielsf avatar danielsf commented on August 14, 2024

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.

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