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  1. Data Management
  2. DM-20201

Fix DECam rotator type and angle in metadata translator

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    • Sprint:
      AP F19-1
    • Team:
      Alert Production

      Description

      DECam 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).

      The diagram on this page should help figure out the correct on-sky rotation angle.

      http://www.ctio.noao.edu/noao/node/2250

      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, Eric Morganson, Jim Bosch, John Parejko, John Swinbank, Lauren MacArthur, Meredith Rawls, Merlin Fisher-Levine, Russell Owen, Tim Jenness
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