Add rotator angle definition for megaprime

lsst · Jun 24, 2019 · 19a9e9c · 19a9e9c
1 parent 2dda32d
commit 19a9e9c
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Showing 2 changed files with 8 additions and 4 deletions.
diff --git a/python/astro_metadata_translator/translators/megaprime.py b/python/astro_metadata_translator/translators/megaprime.py
@@ -49,8 +49,10 @@ class MegaPrimeTranslator(FitsTranslator):
     default_search_path = os.path.join(CORRECTIONS_DIR, "CFHT")
     """Default search path to use to locate header correction files."""
 
-    _const_map = {"boresight_rotation_angle": Angle(float("nan")*u.deg),
-                  "boresight_rotation_coord": "unknown",
+    # CFHT Megacam has no rotator, and the instrument angle on sky is set to
+    # +Y=N, +X=W which we define as a 0 degree rotation.
+    _const_map = {"boresight_rotation_angle": Angle(0*u.deg),
+                  "boresight_rotation_coord": "sky",
                   "detector_group": None}
 
     _trivial_map = {"physical_filter": "FILTER",

diff --git a/tests/test_cfht.py b/tests/test_cfht.py
@@ -26,7 +26,8 @@ def test_megaprime_translator(self):
         test_data = (("fitsheader-megaprime.yaml",
                       dict(telescope="CFHT 3.6m",
                            instrument="MegaPrime",
-                           boresight_rotation_coord="unknown",
+                           boresight_rotation_coord="sky",
+                           boresight_rotation_angle=0*u.degree,
                            dark_time=615.0*u.s,
                            detector_exposure_id=37398350,
                            detector_name="ccd02",
@@ -48,7 +49,8 @@ def test_megaprime_translator(self):
                      ("fitsheader-megaprime-calexp-849375-14.yaml",
                       dict(telescope="CFHT 3.6m",
                            instrument="MegaPrime",
-                           boresight_rotation_coord="unknown",
+                           boresight_rotation_coord="sky",
+                           boresight_rotation_angle=0*u.degree,
                            dark_time=300.0*u.s,
                            detector_exposure_id=30577599,
                            detector_name="ccd99",