Update to use -1.0 outside of allowed planning liimits

ska_sun/sun.py

@@ -19,9 +19,7 @@
 
 def load_roll_table():
     """Load the pitch/roll table from the chandra_models repo."""
-    dat = chandra_models.get_data(
-        CHANDRA_MODELS_PITCH_ROLL_FILE, read_func=Table.read
-    )
+    dat = chandra_models.get_data(CHANDRA_MODELS_PITCH_ROLL_FILE, read_func=Table.read)
     # Sanity check that the pitch values are monotonically increasing.
     assert np.all(np.diff(dat["pitch"]) > 0)
 
@@ -37,7 +35,8 @@ def allowed_rolldev(pitch):
     This performs a linear interpolation of the values in the pitch/roll table in
     the chandra_models repo in ``chandra_models/pitch_roll/pitch_roll_constraint.csv``.
 
-    For pitch values outside the range of the table the returned rolldev is 0.
+    For pitch values outside the range of the table the returned rolldev is -1.0,
+    corresonding to a pitch angle outside of the planning limits.
 
     :param pitch: float, ndarray
         Sun pitch angle (deg)
@@ -48,8 +47,8 @@ def allowed_rolldev(pitch):
         x=pitch,
         xp=ROLL_TABLE.val["pitch"],
         fp=ROLL_TABLE.val["off_nom_roll"],
-        left=0,
-        right=0,
+        left=-1.0,
+        right=-1.0,
     )
     return out
 

ska_sun/tests/test_sun.py

@@ -17,19 +17,20 @@
 # Expected pitch, rolldev pairs
 exp_pitch_rolldev = np.array(
     [
-        [0, 0],
-        [40, 0],
-        [56.0, 0],
+        [0, -1.0],
+        [40, -1.0],
+        [56.0, -1.0],
         [85.49229, 4.95597],
         [85.52, 4.9560848],
         [124.99, 12.23652],
         [125, 12.2380],
         [135, 13.979],
         [138, 14.516],
-        [179.9, 18.749],
-        [179.997, 18.749],
-        [180, 0],
-        [181, 0],
+        [177.9, 18.749],
+        [177.997, 18.749],
+        [178.0, -1.0],
+        [180, -1.0],
+        [181, -1.0],
     ]
 )