poliastro.constants.mean_elements

@author: Dhruv Jain, Multi-Body Dynamics Research Group, Purdue University.

This module complements constants defined in astropy.constants with mean distances between sun-planet and planet-moon systems

Mean distances between the two bodies are required for CR3BP model CR3BP model’s goal is to approximate the behavior of a satellite in an ephemeris model. Thus, it is reasonable to us low precision mean distances values as for more comprehensive mission designs, the CR3BP trajectories are differentially corrected in an ephemeris model with high precision mean distances.

Low precision mean distance between sun-planet were obtained from:

• NASA. (n.d.). Approximate positions of the planets. NASA., from https://ssd.jpl.nasa.gov/planets/approx_pos.html

Low precision mean distance between planet-moon were obtained from:

• NASA. (n.d.). Planetary satellite mean elements. NASA. from https://ssd.jpl.nasa.gov/sats/elem/sep.html

All computed at J2000, except “Pluto - Charon” -> Epoch: 2020-01-01.5 TDB

Module Contents

poliastro.constants.mean_elements.mean_a_mercury

poliastro.constants.mean_elements.mean_a_venus

poliastro.constants.mean_elements.mean_a_earth

poliastro.constants.mean_elements.mean_a_mars

poliastro.constants.mean_elements.mean_a_jupiter

poliastro.constants.mean_elements.mean_a_saturn

poliastro.constants.mean_elements.mean_a_uranus

poliastro.constants.mean_elements.mean_a_neptune

poliastro.constants.mean_elements.mean_a_moon

poliastro.constants.mean_elements.mean_a_phobos

poliastro.constants.mean_elements.mean_a_deimos

poliastro.constants.mean_elements.mean_a_europa

poliastro.constants.mean_elements.mean_a_ganymede

poliastro.constants.mean_elements.mean_a_enceladus

poliastro.constants.mean_elements.mean_a_titan

poliastro.constants.mean_elements.mean_a_titania

poliastro.constants.mean_elements.mean_a_triton

poliastro.constants.mean_elements.mean_a_charon