Purpose: IDL procedure to calculate source coordinates as seen by an observatory correcting for annual parallax and proper motion.
Author: S. Carey (SSC)
Date Contributed 12 Feb 2013 (Revised 25 Oct 2016 to update
ephemerides with dates through 2019)
System Requirements: IDL (tested on IDL 8.1)
Information and Download
Download the source code.
Determine astrometric position in Equatorial (J2000) coodinates for an object given the position at a previous epoch,
the proper motion and the annual parallax. Designed for refining coordinates for Spitzer observations.