def __array_finalize__(self, obj):
    super().__array_finalize__(obj)
    self._radial_velocity = getattr(obj, '_radial_velocity', None)
    self._observer = getattr(obj, '_observer', None)
    self._target = getattr(obj, '_target', None)
def __array_finalize__(self, obj):
    super().__array_finalize__(obj)
    self._radial_velocity = getattr(obj, '_radial_velocity', None)
    self._observer = getattr(obj, '_observer', None)
    self._target = getattr(obj, '_target', None)