boinor.core.propagation.danby
=============================

.. py:module:: boinor.core.propagation.danby

.. autoapi-nested-parse::

   module related to propagation of an orbit using Danby's method in the core sub-package



Functions
---------

.. autoapisummary::

   boinor.core.propagation.danby.danby_coe
   boinor.core.propagation.danby.danby


Module Contents
---------------

.. py:function:: danby_coe(k, p, ecc, inc, raan, argp, nu, tof, numiter=20, rtol=1e-08)

   Danby's method to propagate an orbit using classical orbital elements


.. py:function:: danby(k, r0, v0, tof, numiter=20, rtol=1e-08)

   Kepler solver for both elliptic and parabolic orbits based on Danby's
   algorithm.

   :param k: Standard gravitational parameter of the attractor.
   :type k: float
   :param r0: Position vector.
   :type r0: numpy.ndarray
   :param v0: Velocity vector.
   :type v0: numpy.ndarray
   :param tof: Time of flight.
   :type tof: float
   :param numiter: Number of iterations, defaults to 20.
   :type numiter: int, optional
   :param rtol: Relative error for accuracy of the method, defaults to 1e-8.
   :type rtol: float, optional

   :returns: * **rr** (*numpy.ndarray*) -- Final position vector.
             * **vv** (*numpy.ndarray*) -- Final velocity vector.

   .. rubric:: Notes

   This algorithm was developed by Danby in his paper *The solution of Kepler
   Equation* with DOI: https://doi.org/10.1007/BF01686811