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  1. Data Management
  2. DM-20202

Fix CFHT MegaPrime rotator type and angle in metadata translator

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    • Sprint:
      AP F19-1
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      Alert Production

      Description

      CFHT MegaPrime has its rotator angle set to NaN in astro_metadata_translator, and its rotator type to UNKNOWN. Since it is on an equatorial telescope, we can just pre-compute the correct value, set rotType=SKY and set those in the translator and they will be correct for everything (or at least correct enough to provide an initial guess).

      There are diagrams on this page that may help figure out the correct on-sky rotation angle, though it's not as helpful as the DECam diagrams:

      https://www.cfht.hawaii.edu/Instruments/Imaging/Megacam/specsinformation.html

      One open question is whether we need to set a rotatorHandedness (when +Y is north, is +X is east or west?) value in VisitInfo, or whether we can easily get that from the camera geometry. At present, VisitInfo does not preserve this information, because Russell Owen assumed it would be managed by the camera geometry.

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              • Assignee:
                Parejkoj John Parejko
                Reporter:
                Parejkoj John Parejko
                Reviewers:
                Merlin Fisher-Levine
                Watchers:
                Chris Morrison, Colin Slater, Dominique Boutigny, Jim Bosch, John Parejko, John Swinbank, Lauren MacArthur, Merlin Fisher-Levine, Tim Jenness
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