astro_helpers.hpp

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#pragma once

#include <array>   //std::array
#include <utility> // std::pair

namespace pass
{

typedef struct lambert_solution
{
  std::array<double, 3> departure_velocity;
  std::array<double, 3> arrival_velocity;
} lambert_solution;

lambert_solution lambert(std::array<double, 3> r1_in,
                         std::array<double, 3> r2_in, double t, const double mu,
                         const int lw);

std::pair<double, double> pow_swing_by_inv(const double Vin, const double Vout,
                                           const double alpha);

std::pair<std::array<double, 3>, std::array<double, 3>> conversion(
    const std::array<double, 6> &E, const double mu);

double mean_to_eccentric(const double m, const double e);
} // namespace pass