Data Provider Groups | Data Provider Elements
Apparent LLR State
The apparent position and velocity 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. The rates are computed as observed in the requested coordinate system from the scenario central body.
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 |
|---|---|
| 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 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 TDB = JD 2451545.0 TDB). |
Data Provider Elements
| Name | Dimension | Type | Description |
|---|---|---|---|
| Time | DateFormat | Real Number | Time. |
| Lat | LatitudeUnit | Real Number | The apparent centric latitude, i.e. the angle between apparent position vector and the xy plane of the requested coordinate system. |
| Lon | LongitudeUnit | Real Number | The apparent centric longitude, i.e. the angle from the x-axis locating the projection of the apparent 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 | DistanceUnit | Real Number | The apparent radius, i.e. the magnitude of the apparent position vector. |
| Lat Rate | AngleRateUnit | Real Number | The rate of change of the apparent centric latitude. |
| Lon Rate | AngleRateUnit | Real Number | The rate of change of the apparent centric longitude. |
| Rad Rate | Rate | Real Number | The rate of change of the apparent radius. |