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PlanetsConstants

SHTOOLS Module containing planetary constants.

Description

PlanetsConstants defines several constants that are useful when working with gravity and topography data of the Earth, Mars, Venus, and Moon. All units are SI. Confer with the Python documentation or fortran source file for exact values and references.

Constants

Fundamental Constants

Grav_constant
Gravitational Constant.
pi_constant
Pi.
mu0_constant
Magnetic constant.

The Moon

R_Moon
Mean radius of the Moon.
GM_Moon
Gravitational constant times the mass of the Moon.
Mass_Moon
Mass of the Moon.
rho_bar_Moon
Average density of the Moon.
a_Moon
Semi-major axis of the lunar orbit.
g0_Moon
Mean gravitational acceleration of the Moon at the mean surface radius (R_Moon), not including rotation.
R0_pot_Moon
Reference radius of the gravitational-potential models of the Moon.
Omega_Moon
Angular rotation rate of the Moon.
C_MOI_Moon
Polar moment of inertia of the Moon, using R=1738 km.
I_MOI_Moon
Average moment of inertia of the Moon, using R=1738 km.
Gamma_MOI_Moon
Libration parameter of the Moon, (B-A)/C.
Beta_MOI_Moon
Libration parameter of the Moon, (C-A)/B.

Mars

R_Mars
Average radius of Mars.
GM_Mars
Gravitational constant times the mass of the Mars.
Mass_Mars
Mass of Mars.
rho_bar_Mars
Average density of Mars.
g0_Mars
Gravitational acceleration of Mars at R_Mars, not including rotation.
R0_pot_Mars
Reference radius of the gravitational-potential models of Mars.
Omega_Mars
Angular rotation rate of Mars.
f_Mars
Topographic flattening of Mars.
a_Mars
Semi-major axis radius of Mars.
b_Mars
Semi-minor axis radius of Mars.
W0_mars
Reference potential of Mars.

Venus

R_Venus
Average radius of Venus.
R0_pot_Venus
Reference radius of the gravitational-potential models of Venus.
GM_Venus
Gravitational constant times the mass of the Venus.
Mass_Venus
Mass of Venus.
Omega_Venus
Angular rotation rate of Venus.
rho_bar_Venus
Average density of Venus.
g0_Venus
Gravitational acceleration at R_Venus, not including rotation.

Earth

GM_Earth
Gravitational constant times the mass of the Earth.
R0_pot_Earth
Reference radius of the terrestrial gravitational-potential models.
Mass_Earth
The mass of the Earth.
WGS84_a
The semi-major axis of the WGS84 ellipsoid.
WGS84_b
The semi-minor axis of the WGS84 ellipsoid.
WGS84_r3
The radius of a sphere of Earth's volume.
WGS84_f
The flattening of the WGS84 ellipsoid.
WGS84_gm
The adopted GM of the WGS84 model, which includes the atmosphere.
WGS84_gma
The GM of the atmosphere adopted by the WGS84 model.
WGS84_omega
The adopted angular rotation rate of the Earth of the WGS84 model.
WGS84_U0
The theoretical normal potential associated with the WGS84 model.

Mercury

R_Mercury
Average radius of Mercury.
GM_Mercury
Gravitational constant times the mass of the Mercury.
Mass_Mercury
Mass of Mercury.
R0_pot_Mercury
Reference radius used for the spherical harmonic gravity solutions.
Omega_Mercury_orbit
Angular rotation rate of Mercury about the Sun.
Omega_Mercury_spin
Angular rotation rate of Mercury.
rho_bar_Mercury
Average density of Mercury.
g0_Mercury
Gravitational acceleration at R_Mercury, not including rotation.

See also

shtools

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