adam_core.dynamics.stumpff module¶

adam_core.dynamics.stumpff.calc_stumpff(psi: float64) → Tuple[float64, float64, float64, float64, float64, float64][source]¶

Calculate the first 6 Stumpff functions for variable psi.

Parameters:: psi (float) – Dimensionless parameter at which to evaluate the Stumpff functions (equivalent to alpha * chi**2).
Returns:: c0, c1, c2, c3, c4, c5 – First six Stumpff functions.
Return type:: 6 x float

References

[1] Danby, J. M. A. (1992). Fundamentals of Celestial Mechanics. 2nd ed.,: William-Bell, Inc. ISBN-13: 978-0943396200 Notes: of particular interest is Danby’s fantastic chapter on universal variables (6.9)