Details
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Type:
Story
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Status: Done
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Resolution: Done
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Fix Version/s: None
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Component/s: astro_metadata_translator
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Labels:
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Story Points:2
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Epic Link:
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Sprint:AP F19-1
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Team: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.
Based on suggestions from Lauren MacArthur, it does appear that CFHT MegaPrime uses +Y=N, +X=E, per an image in the document linked above and a line on this table:
https://www.cfht.hawaii.edu/Instruments/Imaging/Megacam/generalinformation.html
This does mean it has a handedness flip from DECam. Joy.