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DM-20201: Add rotator angle definition for decam #25

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Jun 24, 2019
Merged

DM-20201: Add rotator angle definition for decam #25

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6 changes: 4 additions & 2 deletions python/astro_metadata_translator/translators/decam.py
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Original file line number Diff line number Diff line change
Expand Up @@ -38,8 +38,10 @@ class DecamTranslator(FitsTranslator):
default_search_path = os.path.join(CORRECTIONS_DIR, "DECam")
"""Default search path to use to locate header correction files."""

_const_map = {"boresight_rotation_angle": Angle(float("nan")*u.deg),
"boresight_rotation_coord": "unknown",
# DECam has no rotator, and the instrument angle on sky is set to +Y=East,
# +X=South which we define as a 90 degree rotation and an X-flip.
_const_map = {"boresight_rotation_angle": Angle(90*u.deg),
"boresight_rotation_coord": "sky",
}

_trivial_map = {"exposure_time": ("EXPTIME", dict(unit=u.s)),
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11 changes: 7 additions & 4 deletions tests/test_decam.py
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Expand Up @@ -25,7 +25,7 @@ def test_decam_translator(self):
test_data = (("fitsheader-decam.yaml",
dict(telescope="CTIO 4.0-m telescope",
instrument="DECam",
boresight_rotation_coord="unknown",
boresight_rotation_coord="sky",
dark_time=201.15662*u.s,
detector_exposure_id=22938825,
detector_name="1",
Expand All @@ -48,7 +48,8 @@ def test_decam_translator(self):
("fitsheader-decam-0160496.yaml",
dict(telescope="CTIO 4.0-m telescope",
instrument="DECam",
boresight_rotation_coord="unknown",
boresight_rotation_coord="sky",
boresight_rotation_angle=90*u.degree,
dark_time=0.0407898*u.s,
detector_exposure_id=None,
detector_name="1",
Expand All @@ -71,7 +72,8 @@ def test_decam_translator(self):
("fitsheader-decam-calexp-0412037_10.yaml",
dict(telescope="CTIO 4.0-m telescope",
instrument="DECam",
boresight_rotation_coord="unknown",
boresight_rotation_coord="sky",
boresight_rotation_angle=90*u.degree,
dark_time=87.1054702*u.s,
detector_exposure_id=41203701,
detector_name="29",
Expand All @@ -94,7 +96,8 @@ def test_decam_translator(self):
("fitsheader-decam-instcal-c4d_190402_050618_ooi_VR_v1.yaml",
dict(telescope="CTIO 4.0-m telescope",
instrument="DECam",
boresight_rotation_coord="unknown",
boresight_rotation_coord="sky",
boresight_rotation_angle=90*u.degree,
dark_time=120.7646399*u.s,
detector_exposure_id=84529101,
detector_name="29",
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