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Keck-DataReductionPipelines / KPF-Pipeline

KPF-Pipeline
https://kpf-pipeline.readthedocs.io/en/latest/
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Include SKY in final RV for SoCal-Sci exposures #550

Closed rrubenza closed 1 year ago

rrubenza commented 1 year ago

When we're operating SoCal in "Sci" mode, both the SCI and SKY fibers are illuminated with sunlight. So, we actually have four traces of solar spectrum (SCI1, SCI2, SCI3, SKY) that we can use. These exposures should be identifiable as

OBJECT: Sun
SCI-OBJ: Target
SKY-OBJ: Target

and usually (always?) CAL-OBJ = EtalonFiber. I think we can get a bit higher precision RVs if we combine all four traces for the final RV. That is, calculating CCD1RV1 (SCI1), CCD1RV2 (SCI2), CCD1RV3 (SCI3), CCD1RV4 (SKY), and the same for CCD2, and then combining all four in the same way as is done currently for RV1-3 to produce CCD1RV, CCD2RV.

bpholden commented 1 year ago

The OBJECT keyword is set by kpfexpose, so that must be set by whatever script is making the exposures using socal.

kpfconfig should set sci-obj and sky-obj to target.

On Wed, May 10, 2023 at 10:36 AM Ryan Rubenzahl @.***> wrote:

When we're operating SoCal in "Sci" mode, both the SCI and SKY fibers are illuminated with sunlight. So, we actually have four traces of solar spectrum (SCI1, SCI2, SCI3, SKY) that we can use. These exposures should be identifiable as

OBJECT: Sun SCI-OBJ: Target SKY-OBJ: Target

and usually (always?) CAL-OBJ = EtalonFiber. I think we can get a bit higher precision RVs if we combine all four traces for the final RV. That is, calculating CCD1RV1 (SCI1), CCD1RV2 (SCI2), CCD1RV3 (SCI3), CCD1RV4 (SKY), and the same for CCD2, and then combining all four in the same way as is done currently for RV1-3 to produce CCD1RV, CCD2RV.

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awhoward commented 1 year ago

I'll also point out that we want to know the RV even when SKY is recording light from the sky. This will help us assess sky contamination.

awhoward commented 1 year ago

@cwang, is this complete?

cwang2016 commented 1 year ago

yes, it is complete and merged to develop.