Sky background calculation using rubin_sim.skyBrightness SEDs should not include atmospheric absorption

LSSTDESC / imSim

GalSim based Rubin Observatory image simulation package

https://lsstdesc.org/imSim

BSD 3-Clause "New" or "Revised" License

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Sky background calculation using rubin_sim.skyBrightness SEDs should not include atmospheric absorption #453

Closed jchiang87 closed 3 months ago

jchiang87 commented 5 months ago

There's a thread in slack where Lynne Jones mentions this and references SMTN-002, particularly footnote 1.

cwwalter commented 3 months ago

I'm just putting this here for future reference in case anyone is confused by why this is an issue or needs a reminder of the issue. As Jim says this is explained in the tech note above.

Fundamentally the sky model comes from a model from ESO which is measured light coming from the sky including airglow etc. So the light is leaving the atmosphere and going into the pupil. Therefore it doesn't make sense to include the extinction going through the atmosphere.

jchiang87 commented 3 months ago

Fixed in #470