This attribute defines the spacecraft's Initial State by using Cartesian or Spherical coordinate types (orbital elements) if the coordinate system is fixed, or by these or several other coordinate types if the coordinate system is inertial.
Astrogator <Satellite Object Path> SetValue <Astrogator Object Path>.CoordinateType <Value>
Specify the desired element. All of the coordinate types available to the Initial State segment are described in the following table.
Note: When using a coordinate type name consisting of two or more words in a Connect command, the spaces in the name must be replaced with underscores or the entire name must be enclosed in quotes (see the example below).
| Value | Description |
|---|---|
| Cartesian | Specifies an orbit by three position elements and three velocity elements in a rectangular coordinate system. |
| Delaunay | Specifies an orbit by a set of canonical action-angle variables that is commonly used in general perturbation theories. |
| Equinoctial | Specifies an orbit using the center of the central body as the origin and the plane of the vehicle's orbit as the reference plane. |
| Keplerian | The classical system. Specifies an orbit by six elements describing its size, shape and three-dimensional orientation in space. |
| Mixed Spherical | A variation of the spherical elements that combines central body fixed position parameters with inertial velocity parameters |
| Spherical | A system in which positions are specified as a radial distance from the origin and two angles relative to a fundamental plane. |
| Geodetic | Available when using a Fixed coordinate system. |
| Target
Vector Incoming Asymptote |
Used for hyperbolic arrival trajectories. |
| Target
Vector Outgoing Asymptote |
Used for hyperbolic departure trajectories. |
Astrogator */Satellite/Satellite1 SetValue "MainSequence.SegmentList.Initial State.CoordinateType" "Modified Keplerian"
STK Programming Interface 11.0.1