Planet: Apparent LLR State
The apparent position and velocity of the object, expressed in LLR elements,
as a function of time. The apparent position is computed with respect to the
scenario's central body; the rates are computed as observed in the requested
coordinate system from the scenario central body.
The ephemeris can be requested in a variety of coordinate systems.
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.
Type: Time-varying data
Availability: Reports | Graphs | Dynamic Displays | Strip Charts
| Name | Description |
|---|---|
| Fixed | A coordinate system attached to the central body and rotating with it. The z-axis is nominally along the rotation axis. |
| ICRF | Earth's attitude expressed with respect to the ICRF frame. |
| 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 non-rotating 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 = JD 2451545.0 TDB). |
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