AstroConstants.py

# Unit Conversions
# astronomical unit (A.U.) ........... 1.49597870691e8 kilometers (km)
# light year (ly) ........................... 9.460536207e12 km = 63,240 A.U.
# parsec (pc) .............................. 3.08567802e13 km = 206,265 A.U.
# sidereal year (yr) ..................... 365.2564 days
# elementary charge ................... 1.6021765e19 coulombs (C)
# atomic mass unit (mu) ............. 1.6605389e-27 kg# Physical Constants

# Physical Constants
# gravitational constant (G) .......... 6.673e-11 m3 kg−1 s−2
# gravitational acceleration at Earth's surface (g) ... 9.82 m/s
# speed of light in vacuum (c) ....... 2.99792458e5 km/s
# Boltzmann constant (k)............. 1.380648e-23 joules/kelvin (J/K)
# electron mass (me) .................. 9.109382e31 kg
# proton mass (mp) .................... 1.6726217e27 kg
# proton-to-electron mass ratio ..... 1.836152672e3
# Planck constant (h) ................. 6.626069e34 joule-seconds (J⋅sec)
# Rydberg constant (R∞) ............ 1.09737315685e7 m−1
# Stefan-Boltzmann constant (σ) .. 5.6703e8 W m−2 K−4
# Wien's Constant (b) ................. 0.0028977685 m K
# Solar constant ........................ 1.37e3 W m−2

# Astronomical Data
# Earth mass ............................. 5.97219e24 kilograms (kg)
# Earth radius (mean) .................. 6.371e3 kilometers
# Sun mass ............................... 1.9891e30 kg
# Sun radius (mean) ................... 6.95508e5 km
# Sun luminosity ........................ 3.83e26 watts (W)
# Sun surface temperature .......... 5,777 K
# Moon mass ............................. 7.3477e22 kg
# Moon radius (mean) ................. 1.7375e3 km
# Mercury mass ......................... 3.30e 1023 kg
# Mercury radius (mean) ............. 2.4397e3 km
# Venus mass ........................... 4.86732e24 kg
# Venus radius (mean) ............... 6.0518e3 km
# Mars mass ............................. 6.41693e23 kg
# Mars radius (mean) ................. 3.3895e3 km
# Jupiter mass .......................... 1.89813e27 kg
# Jupiter radius (mean) ............... 6.9911e4 km
# Saturn mass ........................... 5.68319e26 kg
# Saturn radius (mean) ............... 5.8232e4 km
# Uranus mass .......................... 8.68103e25 kg
# Uranus radius (mean) ............... 2.5362e4 km
# Neptune mass ......................... 1.0241e26 kg
# Neptune radius (mean) ............. 2.4622e4 km
# Pluto mass ............................. 1.309e22 kg
# Pluto radius (mean) ................. 1.151e3 km

import math
pi = math.pi

gbig 	= 6.673e-11
gearth  = 9.82
au      = 1.49597870691e11
year    = 365.2564

mearth  = 5.97219e24
rearth	= 6.371e6

msun	= 1.9891e30
rsun	= 6.95508e8

mmoon	= 7.3477e22
rmoon	= 1.7375e6

mmerc	= 3.30104e23
rmerc	= 2.4397e6

mvenus  = 4.86732e24
rvenus  = 6.0518e6

mmars	= 6.41693e23
rmars	= 3.3895e6

mjup	= 1.89813e27
rjup	= 6.9911e7

msat	= 5.68319e26
rsat	= 5.8232e7

muranus = 8.68103e25
ruranus = 2.5362e7

mnep	= 1.0241e26
rnep	= 2.4622e7

mpluto	= 1.309e22
rpluto	= 1.151e6