gravity_module Module

Gravity model

See also

geopotential_module

Uses

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Used by

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Subroutines

public subroutine third_body_gravity(r, rb, mu, acc)

Third-body (pointmass) gravitational acceleration.

Arguments

Type	Intent	Optional	Attributes		Name
real(kind=wp),	intent(in),		dimension(3)	::	r	satellite position vector [km]
real(kind=wp),	intent(in),		dimension(3)	::	rb	third-body position vector [km]
real(kind=wp),	intent(in)			::	mu	third-body gravitational parameter [km^3/s^2]
real(kind=wp),	intent(out),		dimension(3)	::	acc	gravity acceleration vector [km/s^2]

public subroutine gravity_j2_j3_j4(r, mu, req, j2, j3, j4, acc)

Gravitational acceleration due to simplified spherical harmonic expansion (only the J2-J4 terms are used).

Arguments

Type	Intent	Optional	Attributes		Name
real(kind=wp),	intent(in),		dimension(3)	::	r	satellite position vector [km]
real(kind=wp),	intent(in)			::	mu	central body gravitational parameter [km^3/s^2]
real(kind=wp),	intent(in)			::	req	body equatorial radius [km]
real(kind=wp),	intent(in)			::	j2	j2 coefficient
real(kind=wp),	intent(in)			::	j3	j3 coefficient
real(kind=wp),	intent(in)			::	j4	j4 coefficient
real(kind=wp),	intent(out),		dimension(3)	::	acc	gravity acceleration vector [km/s^2]