state method

  1. @override
StateVector state(
  1. int target,
  2. int center,
  3. double et
)
override

Position and velocity of target relative to center (NAIF codes) at et (TDB seconds past J2000), in the ICRF/J2000 frame, in km and km/s.

Throws ArgumentError if there is no data for the body at that moment.

Implementation

@override
StateVector state(int target, int center, double et) {
  for (final s in sources) {
    if (s.covers(target, et) &&
        (center == Naif.solarSystemBarycenter || s.covers(center, et))) {
      return s.state(target, center, et);
    }
  }
  // Ciała z różnych źródeł – przez barycentrum Układu Słonecznego.
  return _barycentric(target, et) - _barycentric(center, et);
}