hapsira.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

hapsira.constants.mean_elements.mean_a_mercury

hapsira.constants.mean_elements.mean_a_venus

hapsira.constants.mean_elements.mean_a_earth

hapsira.constants.mean_elements.mean_a_mars

hapsira.constants.mean_elements.mean_a_jupiter

hapsira.constants.mean_elements.mean_a_saturn

hapsira.constants.mean_elements.mean_a_uranus

hapsira.constants.mean_elements.mean_a_neptune

hapsira.constants.mean_elements.mean_a_moon

hapsira.constants.mean_elements.mean_a_phobos

hapsira.constants.mean_elements.mean_a_deimos

hapsira.constants.mean_elements.mean_a_europa

hapsira.constants.mean_elements.mean_a_ganymede

hapsira.constants.mean_elements.mean_a_enceladus

hapsira.constants.mean_elements.mean_a_titan

hapsira.constants.mean_elements.mean_a_titania

hapsira.constants.mean_elements.mean_a_triton

hapsira.constants.mean_elements.mean_a_charon