Orbit – Calculation Positions

Orbit Segment
Segment Type	Controls the orbit segment to be simulated.Full OrbitLets you simulate one or more full orbits. To simulate more than one full orbit, define the number of orbits on the Transient Setup page in the Solution dialog box.Partial OrbitLets you simulate any orbit segment that is not a full orbit. This may be a partial orbital simulation, or an orbit segment that is strung together with other segments to simulate spacecraft maneuvers.
Start Angle Referenced from	Appears when you select Full Orbit from the Segment Type list. Lets you reference the satellite start position from either Local Noon, or Local Midnight.
Angle from Reference	Appears when you select Full Orbit from the Segment Type list. Sets the reference angle for full orbits.
Match Start Time with End of a Parent Orbit	Appears when you select Partial Orbit from the Segment Type list. Lets you match the start time of the child orbit you are defining with the end time of the parent orbit.
Parent Orbit	Available when the Match Start Time with End of a Parent Orbit checkbox is selected. Lets you select a previously defined Orbit modeling object from the Parent Orbit list or click Create Modeling Object to define a new modeling object.Note: Parent Orbits must be:Classical, Sun-Synchronous, Shuttle, or Molniya.Partial orbits.Caution: Simcenter 3D Space Systems Thermal verifies that the end time of a parent orbit matches the start time of a child orbit. However because you must verify these orbits match physically, it is best to avoid referencing parent and child orbits using the Local Noon, Local Midnight, Periapsis, and Apoapsis options.
Start Time	Appears when you select Partial Orbit from the Segment Type list. Sets the time at which the orbit segment begins. For child orbits that continue from a previous orbit, the Start Angle must correspond to the End Angle of the selected orbit.The start time for the orbit segment is equal to the solver-calculated end time of the selected orbit. Only orbits that are not defined with reference to local noon or local midnight appear in the list.
Angles Referenced from	Appears when you select Partial Orbit from the Segment Type list. Ascending Node is the point on the equatorial plane where the satellite passes from the Southern hemisphere to the Northern hemisphere.Descending Node is the point on the equatorial plane where the satellite passes from the Northern hemisphere to the Southern hemisphere.Local Noon is the point where the orbit crosses local noon.Local Midnight is the point where the orbit crosses local midnight.Periapsis is the closest point of the orbit.Apoapsis is the furthest point of the orbit.
Start Angle/End Angle	Appears when you select Partial Orbit from the Segment Type list. Lets you specify the angular values for the locations of the model at the beginning and the end of the analysis.
Intermediate Calculation Positions
Angular Interval Method	Controls how the intermediate calculation positions are set.Number of Intervals sets the number of orbit divisions to the number of equal angular intervals you enter.Angular Positions lets you set the calculation points based on the angles you enter.Note: See Using the Orbit Visualizer for information on display of fixed and intermediate calculation positions in an orbit.
Number of Intervals	Appears only when you select Number of Intervals from the Angular Interval Method list. Sets the number of orbit divisions to the number of equal angular intervals you enter, and creates a calculation point between each interval.
Angular Positions from Start Angle	Appears when you select Angular Positions from the Angular Interval Method list. Controls the units for the calculation points.
Angular Positions from Start Angle text box	Appears only when you select Angular Positions from the Angular Interval Method list. Sets the calculation points to the angles you enter. You can use Cut , Copy , and Paste commands.

Learn more

Orbit

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Orbit – Orbit Parameters

Orbit – Spacecraft Attitude

Orbit – Sun Planet Characteristics

Understanding Beta Angle orbit type parameters

Understanding Classical, Sun Synchronous, Shuttle, and Molniya orbit type parameters

Sun Planet Vectors orbit type parameters

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Orbit – Calculation Positions, Simcenter 3D 2021.1 Series

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