Apparent Heliocentric Classical Elements
Classical osculating orbital elements, sometimes referred to as Keplerian elements, for the apparent position and velocity of a planet, computed with respect to the Sun's inertial coordinate system (i.e., Sun centered ICRF System).Available for these objects: Planet
Type: Time-varying data.
Availability: Reports | Graphs | Dynamic Displays | Strip Charts
Data Provider Elements
| Name | Dimension | Type | Description |
|---|---|---|---|
| Time | Date | Real Number or Text | Time. |
| Semi-major Axis | Distance | Real Number | A measure of the size of the orbit. Orbits with eccentricity <1 are ellipses, with major and minor axes identifying the symmetry axes of the ellipse, the major axis being the longer one. The value is half the length of the major axis. |
| Eccentricity | Unitless | Real Number | A measure of the shape of the orbit. Values <1 indicate an ellipse (where zero is a circular orbit) and values >1 indicate a hyperbola. |
| Inclination | Angle | Real Number or Text | The angle between the orbit plane and the XY plane of the coordinate system. |
| RAAN | Longitude | Real Number or Text | The angle in the XY plane from the X axis to the ascending node, measured in a right-handed sense about the Z axis. in the equatorial plane. For equatorial orbits, the ascending node is defined to be directed along the positive X axis, and thus the value is 0.0. |
| Arg of Perigee | Angle | Real Number or Text | The angle from the ascending node to the periapsis vector measured in the orbit plane in the direction of the object's motion. The periapsis vector locates the closest point of the orbit. For a circular orbit, the value is defined to be zero (i.e., periapsis at the ascending node). |
| True Anomaly | Angle | Real Number or Text | The angle from the periapsis vector, measured in the orbit plane in the direction of motion, to the position vector. |
| Mean Anomaly | Angle | Real Number or Text | A measure of the time past periapsis passing, expressed as an angle. |