feat: add ballistic coefficient subset (#538)

* feat: add ballistic coefficient subset

* fix: format

Author: apaletta3

bindings/python/src/OpenSpaceToolkitAstrodynamicsPy/Trajectory/State/CoordinateSubset.cpp

@@ -257,6 +257,16 @@ inline void OpenSpaceToolkitAstrodynamicsPy_Trajectory_State_CoordinateSubset(py
                     CoordinateSubset: The mass flow rate coordinate subset.
             )doc"
         )
+        .def_static(
+            "ballistic_coefficient",
+            &CoordinateSubset::BallisticCoefficient,
+            R"doc(
+                Get the ballistic coefficient coordinate subset.
+
+                Returns:
+                    CoordinateSubset: The ballistic coefficient coordinate subset.
+            )doc"
+        )
 
         ;
 

bindings/python/test/trajectory/state/test_coordinate_subset.py

@@ -53,3 +53,6 @@ def test_drag_coefficient(self):
 
     def test_mass_flow_rate(self):
         assert CoordinateSubset.mass_flow_rate() is not None
+
+    def test_ballistic_coefficient(self):
+        assert CoordinateSubset.ballistic_coefficient() is not None

include/OpenSpaceToolkit/Astrodynamics/Trajectory/State/CoordinateSubset.hpp

@@ -156,6 +156,11 @@ class CoordinateSubset
     /// @return The default Mass Flow Rate shared pointer instance
     static Shared<const CoordinateSubset> MassFlowRate();
 
+    /// @brief Return a default Ballistic Coefficient instance
+    ///
+    /// @return The default Ballistic Coefficient shared pointer instance
+    static Shared<const CoordinateSubset> BallisticCoefficient();
+
    private:
     String name_;
     Size size_;

src/OpenSpaceToolkit/Astrodynamics/Trajectory/State/CoordinateSubset.cpp

@@ -129,6 +129,13 @@ Shared<const CoordinateSubset> CoordinateSubset::MassFlowRate()
     return massFlowRate;
 }
 
+Shared<const CoordinateSubset> CoordinateSubset::BallisticCoefficient()
+{
+    static const Shared<const CoordinateSubset> ballisticCoefficient =
+        std::make_shared<CoordinateSubset>("BALLISTIC_COEFFICIENT", 1);
+    return ballisticCoefficient;
+}
+
 }  // namespace state
 }  // namespace trajectory
 }  // namespace astrodynamics

test/OpenSpaceToolkit/Astrodynamics/Trajectory/State/CoordinateSubset.test.cpp

@@ -203,3 +203,10 @@ TEST_F(OpenSpaceToolkit_Astrodynamics_Trajectory_State_CoordinateSubset, MassFlo
         EXPECT_NO_THROW(CoordinateSubset::MassFlowRate());
     }
 }
+
+TEST_F(OpenSpaceToolkit_Astrodynamics_Trajectory_State_CoordinateSubset, BallisticCoefficient)
+{
+    {
+        EXPECT_NO_THROW(CoordinateSubset::BallisticCoefficient());
+    }
+}