LLR State Variants | Data Provider Groups | Data Provider Elements

LLR State

The ephemeris of the object with respect to the scenario's central body, as observed from the requested coordinate system, expressed in LLR elements as a function of time.

Data Provider Variant: Planet

Available for these objects: Planet

Type: Time-varying data.

Availability: Reports | Graphs | Dynamic Displays | Strip Charts

Data Provider Groups

Data can be requested in a variety of coordinate systems, where the origin of the coordinate system is the scenario's central body. The available coordinate systems depend on the scenario's central body. Nominally, the systems Fixed, Inertial, J2000, TrueOfDate, and MeanOfDate are supported, although some central bodies (notably the Earth and Sun) have more.

The following lists the systems available for Earth.

Name	Description
TrueOfDateRotating	A variation of the Fixed system where pole wander is ignored. The equator is the same as the TrueOfDate equator and the frame spins about the TrueOfDate z-axis.
Fixed	A coordinate system attached to the central body and rotating with it. The z-axis is nominally along the rotation axis.
ICRF	International Celestial Reference Frame. The ICRF axes are defined as the inertial (i.e., kinematically non-rotating) axes associated with a general relativity frame centered at the solar system barycenter (often called the BCRF).
MeanOfDate	The mean equator mean equinox coordinate system evaluated at the requested time.
MeanOfEpoch	The mean equator mean equinox coordinate system evaluated at the epoch of the object.
TrueOfDate	The true equator true equinox coordinate system evaluated at the requested time.
TrueOfEpoch	The true equator true equinox coordinate system evaluated at the epoch of the object.
B1950	The mean equator mean equinox coordinate system evaluated at the beginning of the Besselian year 1950 (31 December 1949 22:09:46.866 = JD 2433282.4234591).
TEMEOfEpoch	The true equator mean equinox coordinate system evaluated at the epoch of the object.
TEMEOfDate	The true equator mean equinox coordinate system evaluated at the requested time.
AlignmentAtEpoch	The nonrotating coordinate system coincident with the Fixed system evaluated at the object's coordinate reference epoch.
J2000	The mean equator mean equinox coordinate system evaluated at the J2000.0 epoch (2000 January 1.5 TDB = JD 2451545.0 TDB).

Data Provider Elements

Name	Dimension	Type	Description
Time	Date	Real Number or Text	Time.
Lat	Angle	Real Number or Text	The centric latitude, i.e. the angle between position vector and the xy plane of the requested coordinate system.
Lon	Longitude	Real Number or Text	The centric longitude, i.e. the angle from the x-axis locating the projection of the position vector onto the xy plane of the requested coordinate system. Longitude increases in the direction found using the right-hand rule about the z-axis.
Rad	Distance	Real Number	The radius value (i.e. magnitude of the position vector).
Lat Rate	AngleRate	Real Number	The rate of change of the centric latitude.
Lon Rate	AngleRate	Real Number	The rate of change of the centric longitude.
Rad Rate	Rate	Real Number	The rate of change of the radius value.