Stumpff module

digraph {
   "poliastro.core.stumpff" -> "c2", "c3";
}

The Stumpff functions, developed by Karl Stumpff, are used for analyzing orbits using the universal variable formulation.

poliastro.core.stumpff.c2

Second Stumpff function.

For positive arguments:

\[c_2(\psi) = \frac{1 - \cos{\sqrt{\psi}}}{\psi}\]
poliastro.core.stumpff.c3

Third Stumpff function.

For positive arguments:

\[c_3(\psi) = \frac{\sqrt{\psi} - \sin{\sqrt{\psi}}}{\sqrt{\psi^3}}\]