Adding user data to SpacecraftState
All propagators provides a way to propagate additional state. The
analytical propagators
can register AdditionalStateProviders instances representing already
integrated states,
and integrated propagators (numerical and DSST) can register
AdditionalEquations representin
differential equations for these states. In both cases, the output is
difficult to retrieve
and lives aparts from the SpacecraftState.
Having these data available within the SpacecraftState would be much simpler.
A way to add user data may also prove useful outside of propagation.
(from redmine: issue id 132, created on 2013-04-08, closed on 2013-04-08)