Central Body Gravity

The standard Central Body Gravity force model parameters are listed in the following table:

Option	Description
Use	Select to use this force model. This option is only available when defining a force model vector. The HPOP propagator uses this force model automatically.
Gravity	An ASCII file containing the Central Body geopotential model coefficients. Select one of STK's standard gravity models or import your own user-defined gravity file.
Maximum Degree	The maximum degree of geopotential coefficients to be included for Central Body gravity computations. The range of values is enforced by the central gravity model (.grv).
Maximum Order	The maximum order of geopotential coefficients to be included for Central Body gravity computations. The range of values is enforced by the central gravity model (.grv).
Solid Tides	This option can be used to include the perturbation of the gravity field caused by the effects of solid tides, providing that the Central Body gravity field has a solid-tide model available. None - exclude solid-tide contributions entirely. Permanent tide only - include only the permanent (time-independent) tidal contribution of the solid-tide model. By default, gravity fields that do not specify a separable permanent tide are assumed to have the permanent tide included in the gravity field. Full - include the permanent tide plus all other solid-tide modeling contributions. Additional settings for this parameter are available. If the selected gravity field for the Earth does not contain its own solid-tide model, the IERS model will be the default solid-tide model.
Use Ocean Tides	If this option is checked, then the perturbation of the gravity field caused by the effects of ocean tides is included. Additional settings for this parameter are available. This option is only active for Earth gravity files.
Ignore Two Body	Select to exclude the Two Body gravity force. This option is only available when defining a force model vector. The HPOP propagator uses this force model automatically.