Description
The J2 Mean propagator is a first-order propagator that accounts only for the Earth's J2 geopotential model (Earth oblateness). No other effects, such as the Sun, Moon, or atmospheric drag, are modeled. The J2Mean propagator only takes Right Ascension of the Ascending Node and Argument of Perigee rates into account. A comparison between a J2Mean propagation and a numeric integration using, for example, an RK89, depends largely on whether the initial integration state is close to the mean orbit.
Inheritance Hierarchy: Object->Propagator->J2Mean
Available In Editions:
Engineer
Mission
Timing Precision Mode
This page describes functionality in millisecond timing precision mode. Millisecond timing precision mode is deprecated and will be removed in a future release. We recommend that you migrate your Mission Plans to nanosecond timing precision mode.
Click here to see the documentation for this object in nanosecond timing precision mode.
Signatures
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Description
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J2Mean()
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Creates a default J2Mean object.
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J2Mean(ForceModel forceModel)
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Create a propagator with the specified ForceModel. Note: On analytical propagators the ForceModel is not used. In this situation, the default constructor with no arguments should be used.
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Name
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Description
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Attributes
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DeclaredName
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The name of the object as declared.
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Type: String
Access: Read-Only
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Name
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The name displayed for this object in output windows such as views, plots, and reports.
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Type: String
Access: Read/Write
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ObjectId
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The unique identifier for the object.
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Type: Variable
Access: Read-Only
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ObjectType
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The type of the object.
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Type: String
Access: Read-Only
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StepSize
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The number of seconds the propagated object is advanced when the Step command is executed.
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Type: Variable
Access: Read/Write
Units: s
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Name
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Description
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ClearSavedStates
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Clears previous saved states for this object.
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GetFromFile
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Load the object state from the specified FreeFlyer object file.
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GetFromString
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Load the object state from the specified string.
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PutToFile
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Convert the object state to FreeFlyer object xml and write to a file.
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PutToString
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Convert the object state to FreeFlyer object xml and return as a string.
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ReferenceEquals
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Returns 1 if the argument refers to the calling object and 0 otherwise.
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Restore
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Restore an object's state from a previously saved state.
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Save
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Save the object's state so that it can be restored later.
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See also
Spacecraft Propagators
Setting up an Integrator
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