Orbit – Spacecraft Attitude

Orientation Options
Specify Vector	Lets you specify the two nonparallel vectors to use to orient the model in relation to the celestial body. With this option, you select two edges from your model, define a vector, and then assign it a direction.The first vector you define always points towards its target in the direction you select from the Aim at list. If the two orientations are not perpendicular, the second vector you select is not parallel to the direction you select from the Align with list, but it remains as aligned as possible.The second vector you define cannot be parallel with the first vector.See Vector dialog box for more information.
Aim at****Align with	Assigns the aim at (1) and align with (2) vectors to orient the spacecraft. Both vectors originate from the spacecraft.The aim at vector is in the direction in which the first vector always aims, for example Nadir, Star, or Velocity Vector. If you specify Star, you must define the right ascension and the declination of the star.For non-rotating spacecraft, the first vector always aims at the selected direction.For rotating spacecraft, the first vector aims at the specified direction at analysis time 0.Note: Aim at and align with vectors must not be parallel in order to orient the spacecraft.
Star Right Ascension	Appears when you select Star from the Aim At or Align with lists.Defines the right ascension of a celestial body. The right ascension is one of the two coordinates of a point in the celestial sphere when using the equatorial coordinate system.This option sets the star direction used with the star Declination to align the vector.
Declination	Appears when you select Star from the Aim At or Align with lists.Defines the declination of a celestial body. The declination is one of the two coordinates of a point in the celestial sphere when using the equatorial coordinate system.This option sets the star direction used with the Star Right Ascension to align the vector.
Rotation Parameters
Rotation	Lets you model rotating on the spacecraft.
Rotation Axis	Specifies the axis of rotation of the spacecraft. Global Cyclic AnalysisAppears if you defined the cyclic symmetry cylindrical coordinate system in the FEM. Rotates the spacecraft around the Z-axis of the cyclic symmetry cylindrical coordinate system. User-DefinedLets you specify the axis of rotation. Use the Specify Vector options to specify the direction of revolution, and use the Specify Point options to specify the location of the axis.
Rotation Rate Type	Specifies how the rotation rate of the spacecraft is defined. You can define either the rotation rate as a constant value or the angular position as a function of time.
Rotation Rate (angle/orbit)	Appears when the Rotation Rate Type is set to Expression.Sets the rotation rate in degrees per orbit, radians per orbit, or revolution per orbit.

These options are available when the magnitude is defined as Field.
Select Existing Field from List	Lets you select an existing field.
Formula Constructor	Lets you use a formula to construct a field. For more information, see Define a boundary condition using a formula field.
Table Constructor	Lets you use a table to construct a field.For more information, see Define a boundary condition using a table field and Define a material property using a table field.
Link Constructor	Lets you reference an existing field. You can override the field's spatial map to use the field in another location.For more information, see Linked Field dialog box.
Plot(XY)	Plots the field as an XY graph.For more information, see: Plot functions, Graph overview, and Edit display properties of graph objects.
Overlay(XY)	Available when a plot is already displayed. Overlays a plot on an existing plot. You can overlay up to 50 plots. For more information, see Overlay plots.

Learn more

Orbit

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Orbit – Orbit Parameters

Orbit – Calculation Positions

Orbit – Sun Planet Characteristics

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

Sun Planet Vectors orbit type parameters

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Orbit – Spacecraft Attitude, Simcenter 3D 2021.1 Series

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