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

@@ -19,6 +19,18 @@ def instrument_id(self):
  """
  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

@@ -37,6 +37,11 @@ def setUp(self):
 
  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