JplDE430 Class | DME Component Libraries for .NET 2024 r3

SystemObject
  AGI.Foundation.InfrastructureDefinitionalObject
    AGI.Foundation.CelestialJplDE
      AGI.Foundation.CelestialJplDE430

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public class JplDE430 : JplDE, IJplDEWithMoonLibrationModel

Public Class JplDE430
	Inherits JplDE
	Implements IJplDEWithMoonLibrationModel

public ref class JplDE430 : public JplDE, 
	IJplDEWithMoonLibrationModel

type JplDE430 =  
    class
        inherit JplDE
        interface IJplDEWithMoonLibrationModel
    end

	Name	Description
	JplDE430(JplDEFile)	Initializes an instance using the specified JplDEFile instance.
	JplDE430(StreamFactory)	Initializes a new instance with the specified stream factory.
	JplDE430(String)	Initializes an instance using the specified JPL DE filename.
	JplDE430(JplDE430, CopyContext)	Initializes a new instance as a copy of an existing instance.

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	Name	Description
	EarthMoonMassRatio	Gets the ratio of the mass of the earth to the mass of the moon. (Inherited from JplDE.)
	EarthRadius	Gets the radius of Earth in kilometers.
	File	Gets the raw JPL DE file represented by this instance. (Inherited from JplDE.)
	FinalEpoch	Gets the last epoch for which ephemeris data is available. (Inherited from JplDE.)
	InitialEpoch	Gets the first epoch for which ephemeris data is available. (Inherited from JplDE.)
	IsFrozen	Gets a value indicating whether this object is frozen. A frozen object cannot be modified and an ObjectFrozenException will be thrown if an attempt is made to do so. (Inherited from DefinitionalObject.)
	KilometersPerAstronomicalUnit	Gets the number of kilometers (km) in one astronomical unit (AU). (Inherited from JplDE.)
	LunarEphemerisNumber	Gets the number indicating the source of the data. For example, '405' indicates the DE405 ephemerides. (Inherited from JplDE.)
	PlanetaryEphemerisNumber	Gets the number indicating the source of the data. For example, '405' indicates the DE405 ephemerides. (Inherited from JplDE.)
	Source	Gets the string describing the source of the data.
	SpeedOfLight	Gets the speed of light in km/s. (Inherited from JplDE.)
	Titles	Gets the collection of titles. (Inherited from JplDE.)

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	Name	Description
	CheckForSameDefinition(DefinitionalObject)	Checks to determine if another instance has the same definition as this instance and returns if it does. Derived classes MUST override this method and check all new fields introduced by the derived class for definitional equivalence. It is NOT necessary to check base class fields because the base class will already have done that. When overriding this method, you should NOT call the base implementation because it will return for all derived-class instances. Derived classes should check the type of other to preserve the symmetric nature of IsSameDefinition(Object). (Inherited from JplDE.)
	CheckForSameDefinition(JplDE)	Checks to determine if another instance has the same definition as this instance and returns if it does. Derived classes MUST override this method and check all new fields introduced by the derived class for definitional equivalence. It is NOT necessary to check base class fields because the base class will already have done that. When overriding this method, you should NOT call the base implementation because it will return for all derived-class instances. Derived classes should check the type of other to preserve the symmetric nature of IsSameDefinition(Object). (Overrides JplDECheckForSameDefinition(JplDE).)
	CheckForSameDefinition(JplDE430)	Checks to determine if another instance has the same definition as this instance and returns if it does. Derived classes MUST override this method and check all new fields introduced by the derived class for definitional equivalence. It is NOT necessary to check base class fields because the base class will already have done that. When overriding this method, you should NOT call the base implementation because it will return for all derived-class instances. Derived classes should check the type of other to preserve the symmetric nature of IsSameDefinition(Object).
	Clone	Clones this object using the specified context. (Overrides DefinitionalObjectClone(CopyContext).)
	ComputeCurrentDefinitionHashCode	Computes a hash code based on the current properties of this object. Derived classes MUST override this method and compute a hash code that combines: a unique hash code seed, the base implementation result, and the hash codes of all new fields introduced by the derived class which are used in the CheckForSameDefinition(DefinitionalObject) method. (Overrides JplDEComputeCurrentDefinitionHashCode.)
	CreateEarthMoonBarycenterPoint	Creates a Point that represents the position of the Earth-Moon barycenter calculated from the data in this class. (Inherited from JplDE.)
	EnumerateDependencies	Enumerates the dependencies of this object by calling EnumerateT(T) for each object that this object directly depends upon. Derived classes which contain additional dependencies MUST override this method, call the base implementation, and enumerate dependencies introduced by the derived class. (Inherited from JplDE.)
	Equals	Determines whether the specified object is equal to the current object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	Freeze	Freezes this object. Further attempts to modify it will result in an ObjectFrozenException. (Inherited from DefinitionalObject.)
	FreezeAggregatedObjects	Called by Freeze to also freeze any objects that are considered to be a part of this object. Derived classes which contain additional aggregated objects MUST override this method, call the base implementation, and freeze aggregated objects introduced by the derived class. The objects that need to be frozen in this method are frequently created in this object's constructor and are not settable via properties. (Inherited from JplDE.)
	GetCenterOfMassPoint	Gets a point which represents the center of mass of the given JplDECentralBody. (Inherited from JplDE.)
	GetDefinitionHashCode	Gets a hash code representing the definition of this object. (Inherited from DefinitionalObject.)
	GetEarthNutationModel	Creates a NutationModel which uses this JPL DE data for the nutation of the Earth. (Inherited from JplDE.)
	GetGravitationalParameter	Gets the gravitational parameter of a central body in SI units (m^3/s^2). (Inherited from JplDE.)
	GetGravitationalParameterNative	Gets the gravitational parameter of a central body in AU^3/day^2. (Inherited from JplDE.)
	GetHashCode	Serves as the default hash function. (Inherited from Object.)
	GetMoonFixedFrame	Uses the JplDE430 data to return the orientation and position of the Moon's principal axes of inertia to define a fixed frame. This is useful as a frame in which to describe the gravity of the Moon.
	GetMoonLibrationModel	Gets a libration model for the Moon.
	GetMoonTopographicFixedFrame	Uses the JplDE430 data to return the orientation and position of the Moon's "Mean Earth" axes which define a fixed frame with the z-axis pointing toward the mean axis of rotation, the x-axis pointing toward the mean direction to the Earth, and the y-axis orthogonal. This is useful for describing topographic features on the Moon.
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	IsSameDefinition	Determines if this object has the same definition as another object. (Inherited from DefinitionalObject.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ThrowIfFrozen	Throws ObjectFrozenException if this object IsFrozen. This method should be called from any method or property that modifies this object. (Inherited from DefinitionalObject.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)
	UseForCentralBodyPositions	Uses this JPL DE data for the positions of the centers of mass of the central bodies in the specified CentralBodiesFacet instance. This also sets the positions of all the PlanetarySystemBarycenters. In particular, the EarthMoonBarycenter is calculated using the EarthMoonMassRatio and the updated positions of EarthCentralBody and MoonCentralBody. The other planetary system barycenters are set to exactly the same positions as their respective planets because technically the JPL DE data provides the barycenter positions rather than the physical positions of those planets. (Inherited from JplDE.)

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	Name	Description
	EphemerisNumber	The PlanetaryEphemerisNumber represented by this class.

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JPL Planetary Ephemeris files can be downloaded from https://ftp.agi.com/pub/STKData/Astro/PlanetEphem/lendian/.

The following example shows how to load a JPL DE file and use its data for the positions of the centers of mass of the central bodies in a CentralBodiesFacet:

C#

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// Load a JplDE file using a string that represents the JplDE file
JplDE430 jplde = new JplDE430(Path.Combine(dataPath, "plneph.430"));

// Use the JplDE data in a CentralBodiesFacet
CentralBodiesFacet centralBodies = CentralBodiesFacet.GetFromContext();
jplde.UseForCentralBodyPositions(centralBodies);

// Optional - use the JplDE data for the Lunar fixed frame
MoonCentralBody moon = centralBodies.Moon;
moon.FixedFrame = jplde.GetMoonFixedFrame();

Reference

AGI.Foundation.Celestial Namespace