Hayabusa amica Ephemeris Fix (#592)

* Fixed hayabusa ephemeris times

* Updated function doc string

* Added test for new property

* added changelog entry

CHANGELOG.md

@@ -40,6 +40,7 @@ release.
 ### Fixed
 
 - Fixed landed sensors to correctly project locally [#590](https://github.com/DOI-USGS/ale/pull/590)
+- Fixed Hayabusa amica center time computation to match ISIS [#592](https://github.com/DOI-USGS/ale/pull/592)
 
 ## [0.10.0] - 2024-01-08 
 

ale/drivers/hayabusa_drivers.py

@@ -20,6 +20,18 @@ class HayabusaAmicaIsisLabelNaifSpiceDriver(Framer, IsisLabel, NaifSpice, Radial
         lookup_table = {'AMICA': 'HAYABUSA_AMICA'}
         return lookup_table[super().instrument_id]
     
+    @property
+    def center_ephemeris_time(self):
+        """
+        Returns the start ephemeris time plus half the exposure duration.
+
+        Returns
+        -------
+        : double
+          Center ephemeris time for an image
+        """
+        return self.ephemeris_start_time + self.exposure_duration / 2
+
     @property
     def sensor_model_version(self):
         """

tests/pytests/test_hayabusa_drivers.py

@@ -38,6 +38,11 @@ class test_amica_isis_naif(unittest.TestCase):
     def test_instrument_id(self):
         assert self.driver.instrument_id == "HAYABUSA_AMICA"
 
+    def test_center_ephemeris_time(self):
+        with patch('ale.drivers.hayabusa_drivers.spice.scs2e', return_value=12345) as scs2e:
+            assert self.driver.center_ephemeris_time == 12345 + 0.0109
+            scs2e.assert_called_with(-130, '2457499394')
+    
     def test_sensor_model_version(self):
         assert self.driver.sensor_model_version == 1