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orbital_tools.py
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orbital_tools.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Orbital tools different calculation tools
for the give orbit
"""
class OrbitalTools:
# Earth radius given in km
self.earth_radius = 6378.137
def calc_semi_major_axis(
self,
perigee,
apogee,
earth_radius=False):
"""
Calculates the Semi Major axis from Apogee and Perigee
Earth_radius Boolean, per default false if
not added to Perigee and Apogee
"""
apogee_earth = apogee + self.earth_radius
perigee_earth = perigee + self.earth_radius
return float((apogee_earth + perigee_earth) / 2)
def calc_apogee(semi_major_axis, eccentricity):
"""
Calculates the apogee from SemiMajor Axis and Eccentricity
"""
return float((1 + eccentricity) * semi_major_axis)
def calc_perigee(semi_major_axis, eccentricity):
"""
Calculates the perigee from SemiMajor Axis and Eccentricity
"""
return float((1 - eccentricity) * semi_major_axis)
def calc_eccentricity(apogee, perigee):
"""
Calculates the Eccentricity from Apogee and Perigee
"""
return float((apogee - perigee) / (apogee + perigee))