poliastro2.worldview.solar_sys.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