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  1. Data Management
  2. DM-20133

VisitInfo uses incorrect calculation of hour angle

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      4
    • Team:
      Architecture

      Description

      The calculations of hour angle and parallactic angle in VisitInfo.cc use getBoresightRaDec(), which returns Ra and Dec in the  International Celestial Reference System (ICRS). However, the correct frame for those calculations is the Celestial Intermediate Origin (CIO, or cirs in Astropy). Using the wrong coordinate frame ignores precession and nutation. It is probably correct to store the boresight RA and Dec coordinates in ICRS, but they need to be transformed to CIO for the hour angle and parallactic angle calculations.

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              • Assignee:
                Unassigned
                Reporter:
                sullivan Ian Sullivan
                Watchers:
                Ian Sullivan, John Parejko, John Swinbank, Tim Jenness
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