SolRadAndGravityDynamics.compute_dynamics

giant.ufo.dynamics:

SolRadAndGravityDynamics.compute_dynamics(time, state)[source]

This method computes the dynamics for the state vector

The dynamics are returned as a 1d array of length 56. It gives the time derivative of the state vector.

The first 6 elements of the dynamics array are the position and velocity components of the state vector respectively. The next element is cram. The last 49 elements are the dynamics of the covariance matrix raveled in c-order.

Parameters:

  • time (float) – the time at which the dynamics are to be computed in ephemeris seconds since J2000

  • state (ndarray) – The state vector to compute the dynamics for

Returns:

The time derivative of the state vector

Return type:

ndarray