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DM-39169: Correct non-numeric ROTPA values. #450

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May 16, 2023
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DM-39169: Correct non-numeric ROTPA values. #450

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5 changes: 4 additions & 1 deletion python/lsst/obs/lsst/translators/comCam.py
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@
__all__ = ("LsstComCamTranslator", )

import logging
from numbers import Number

from astropy.time import Time
from .lsstCam import LsstCamTranslator
Expand Down Expand Up @@ -91,8 +92,10 @@ def fix_header(cls, header, instrument, obsid, filename=None):
-----
Fixes the following issues:

* If ComCam was in Chile, the FILTER is always empty (or unknown).
* If LSST_NUM is missing it is filled in by looking at the CCDSLOT
value and assuming that the ComCam detectors are fixed.
* If ROTPA is missing or non-numeric, it is set to 0.0.

Corrections are reported as debug level log messages.

Expand Down Expand Up @@ -131,7 +134,7 @@ def fix_header(cls, header, instrument, obsid, filename=None):
modified = True
log.debug("%s: Set LSST_NUM to %s", log_label, header["LSST_NUM"])

if "ROTPA" not in header:
if "ROTPA" not in header or not isinstance(header["ROTPA"], Number):
header["ROTPA"] = 0.0
log.warning("Missing ROTPA in header - replacing with 0.0")
modified = True
Expand Down