Vector from the central body center to
the nearest point on the orbit computed based on Brouwer-Lyddane
mean elements with short term perturbations.
| Name |
Dimension |
Type |
Description |
| Time |
DateFormat |
Real Number |
Time. |
| x |
DistanceUnit |
Real Number |
The X component of the position vector. |
| y |
DistanceUnit |
Real Number |
The Y component of the position vector. |
| z |
DistanceUnit |
Real Number |
The Z component of the position vector. |
| Magnitude |
DistanceUnit |
Real Number |
Magnitude of the displacement vector that locates
selected point in the reference coordinate system, i.e. distance of
the selected point from the origin of the reference coordinate
system. |
| x/Magnitude |
Unitless |
Real Number |
First component of the unit vector along the
displacement vector that locates selected point in the reference
coordinate system. Defines projection of the unit vector onto the
x-axis of the reference coordinate system. |
| y/Magnitude |
Unitless |
Real Number |
Second component of the unit vector along the
displacement vector that locates selected point in the reference
coordinate system. Defines projection of the unit vector onto the
y-axis of the reference coordinate system. |
| z/Magnitude |
Unitless |
Real Number |
Third component of the unit vector along the
displacement vector that locates selected point in the reference
coordinate system. Defines projection of the unit vector onto the
z-axis of the reference coordinate system. |
| RightAscension |
LongitudeUnit |
Real Number |
Right ascension of the displacement vector that
locates selected point in the reference coordinate system,
Represents the angle between the x-axis of the reference coordinate
system and projection of the displacement vector onto the xy-plane
of the reference coordinate system. The angle is measured
counterclockwise about the z-axis of the reference coordinate
system. |
| Declination |
LatitudeUnit |
Real Number |
Declination of the displacement vector that locates
selected point in the reference coordinate system, Represents the
angle between the displacement vector and its projection onto the
xy-plane of the reference coordinate system. The angle is positive
when the displacement vector is directed toward positive z-axis of
the reference coordinate system. |
| Co-Declination |
AngleUnit |
Real Number |
Co-Declination of the displacement vector that
locates selected point in the reference coordinate system,
Represents the angle between the displacement vector and z-axis of
the reference coordinate system. |
| NegativeDeclination |
AngleUnit |
Real Number |
Negative declination of the displacement vector
that locates selected point in the reference coordinate system,
Represents the angle between the displacement vector and its
projection onto the xy-plane of the reference coordinate system.
The angle is positive for vectors directed toward negative z-axis
of the reference coordinate system. |
| DirectionAngle x |
AngleUnit |
Real Number |
Angle between the displacement vector that locates
selected point in the reference coordinate system and the x-axis of
the reference coordinate system. |
| DirectionAngle y |
AngleUnit |
Real Number |
Angle between the displacement vector that locates
selected point in the reference coordinate system and the y-axis of
the reference coordinate system. |
| DirectionAngle z |
AngleUnit |
Real Number |
Angle between the displacement vector that locates
selected point in the reference coordinate system and the z-axis of
the reference coordinate system. |
| Derivative x |
Rate |
Real Number |
First component of the derivative vector, where the
vector is defined as the time rate of change of the selected vector
in the reference set of axes. Defines projection of the derivative
vector onto the x-axis of the reference set. |
| Derivative y |
Rate |
Real Number |
Second component of the derivative vector, where
the vector is defined as the time rate of change of the selected
vector in the reference set of axes. Defines projection of the
derivative vector onto the y-axis of the reference set. |
| Derivative z |
Rate |
Real Number |
Third component of the derivative vector, where the
vector is defined as the time rate of change of the selected vector
in the reference set of axes. Defines projection of the derivative
vector onto the z-axis of the reference set. |
| Derivative
Magnitude |
Rate |
Real Number |
Magnitude of the derivative vector, where the
vector is defined as the time rate of change of the selected vector
in the reference set of axes. |