compute_eclipse_penumbra#

namespace saltro
namespace orbits

Functions

bool compute_eclipse_penumbra(const Eigen::Matrix<double, 3, saltro::limits::MAX_LENGTH_TRAJ> &R, const int jtime_length, Eigen::Matrix<double, 3, saltro::limits::MAX_LENGTH_TRAJ> &S)#

Compute Earth eclipse shadow using analytical penumbra/umbra model.

Uses an analytical shadow cone model based on apparent angular sizes of Earth and Sun as seen from the spacecraft. The spacecraft is considered in eclipse (penumbra or umbra) if the angular separation between the Earth and Sun centers is smaller than the sum of their apparent angular radii. When in eclipse, the Sun vector is set to zero.

Parameters:

  • R – Spacecraft position vectors (meters). Each column corresponds to one trajectory sample.

  • jtime_length – Number of valid trajectory samples.

  • S – Spacecraft-to-Sun vectors (meters), column-wise. Modified in-place; set to zero where spacecraft is in eclipse.

Returns:

True if the computation succeeds for all samples, false otherwise.