Fixed issues that were causing the horizons initial conditions genera…

…tor to fail if a valid body could not be identified.

python/swiftest/swiftest/init_cond.py

@@ -225,7 +225,7 @@ def get_altid(errstr,exclude_spacecraft=True):
         altname =[jpl.table['targetname'][0]]
     except Exception as e:
         altid,altname = get_altid(str(e))
-        if altid is not None: # Return the first matching id
+        if altid is not None and len(altid) >0: # Return the first matching id
             id = altid[0]
             jpl = Horizons(id=id, location='@sun',
                         epochs={'start': ephemerides_start_date, 'stop': ephemerides_end_date,
@@ -340,9 +340,12 @@ def solar_system_horizons(name: str,
         print(f"Fetching ephemerides data for {ephemeris_id} from JPL/Horizons")
 
         jpl,altid,altname = horizons_query(ephemeris_id,ephemerides_start_date)
-        print(f"Found ephemerides data for {altname[0]} ({altid[0]}) from JPL/Horizons")
-        if name == None:
-            name = altname[0]
+        if jpl is not None:
+            print(f"Found ephemerides data for {altname[0]} ({altid[0]}) from JPL/Horizons")
+            if name == None:
+                name = altname[0]
+        else:
+            return None
 
         if param['IN_FORM'] == 'XV':
             rx = jpl.vectors()['x'][0] * DCONV
@@ -380,7 +383,7 @@ def solar_system_horizons(name: str,
 
             # Generate planet value vectors
             if (param['RHILL_PRESENT']):
-                rhill = jpl.elements()['a'][0] * DCONV * (3 * MSun_over_Mpl[name]) ** (-THIRDLONG)
+                rhill = jpl.elements()['a'][0] * DCONV * (3 * Gmass / GMcb) ** (-THIRDLONG)
 
             if (param['ROTATION']):
                 rot *= param['TU2S']

python/swiftest/swiftest/simulation_class.py

@@ -2232,10 +2232,15 @@ def add_solar_system_body(self,
 
         body_list = []
         for i,n in enumerate(name):
-            body_list.append(init_cond.solar_system_horizons(n, self.param, date, ephemeris_id=ephemeris_id[i]))
+            body = init_cond.solar_system_horizons(n, self.param, date, ephemeris_id=ephemeris_id[i])
+            if body is not None:
+                body_list.append(body)
 
         #Convert the list receieved from the solar_system_horizons output and turn it into arguments to vec2xr
-        if len(body_list) == 1:
+        if len(body_list) == 0:
+           print("No valid bodies found")
+           return 
+        elif len(body_list) == 1:
             values = list(np.hsplit(np.array(body_list[0],dtype=np.dtype(object)),17))
         else:
             values = list(np.squeeze(np.hsplit(np.array(body_list,np.dtype(object)),17)))