Physical Constants¶
Physical properties of celestial bodies and universal constants. All values use SI base units.
Universal Constants¶
C_LIGHT¶
module-attribute
¶
C_LIGHT: float = 299792458.0
Convert a string or number to a floating-point number, if possible.
Value: 299792458.0 m/s
Speed of light in vacuum.
AU¶
module-attribute
¶
AU: float = 149597870700.0
Convert a string or number to a floating-point number, if possible.
Value: 1.495978707e11 m
Astronomical Unit - mean distance of Earth from the Sun. TDB-compatible value.
P_SUN¶
module-attribute
¶
P_SUN: float = 4.56e-06
Convert a string or number to a floating-point number, if possible.
Value: 4.56e-6 N/m²
Solar radiation pressure at 1 AU.
Earth Constants¶
Geometry¶
R_EARTH¶
module-attribute
¶
R_EARTH: float = 6378136.3
Convert a string or number to a floating-point number, if possible.
Value: 6378136.3 m
Earth's equatorial radius (GGM05 gravity model).
WGS84_A¶
module-attribute
¶
WGS84_A: float = 6378137.0
Convert a string or number to a floating-point number, if possible.
Value: 6378137.0 m
Earth's semi-major axis as defined by WGS84 geodetic system.
WGS84_F¶
module-attribute
¶
WGS84_F: float = 0.0033528106647474805
Convert a string or number to a floating-point number, if possible.
Value: 0.0033528106647474805 (dimensionless)
Earth's ellipsoidal flattening. WGS84 value: 1/298.257223563
ECC_EARTH¶
module-attribute
¶
ECC_EARTH: float = 0.081819190842622
Convert a string or number to a floating-point number, if possible.
Value: 0.081819190842622 (dimensionless)
Earth's first eccentricity (WGS84 value).
Gravitational Properties¶
GM_EARTH¶
module-attribute
¶
GM_EARTH: float = 398600441500000.0
Convert a string or number to a floating-point number, if possible.
Value: 3.986004415e14 m³/s²
Earth's gravitational parameter (μ = G × M).
J2_EARTH¶
module-attribute
¶
J2_EARTH: float = 0.0010826358191967
Convert a string or number to a floating-point number, if possible.
Value: 0.0010826358191967 (dimensionless)
Earth's J2 zonal harmonic coefficient (GGM05s gravity model). Represents Earth's oblateness.
OMEGA_EARTH¶
module-attribute
¶
OMEGA_EARTH: float = 7.292115146706979e-05
Convert a string or number to a floating-point number, if possible.
Value: 7.292115146706979e-05 rad/s
Earth's axial rotation rate.
Celestial Body Gravitational Parameters¶
Gravitational parameters (μ = G × M) for major solar system bodies in m³/s².
Sun¶
GM_SUN¶
module-attribute
¶
GM_SUN: float = 1.327124400419394e+20
Convert a string or number to a floating-point number, if possible.
Value: 1.32712440041939e20 m³/s²
R_SUN¶
module-attribute
¶
R_SUN: float = 695700000.0
Convert a string or number to a floating-point number, if possible.
Value: 6.9634e8 m
Solar radius.
Moon¶
GM_MOON¶
module-attribute
¶
GM_MOON: float = 4902800066000.0
Convert a string or number to a floating-point number, if possible.
Value: 4.9028e12 m³/s²
R_MOON¶
module-attribute
¶
R_MOON: float = 1738000.0
Convert a string or number to a floating-point number, if possible.
Value: 1.738e6 m
Lunar radius.
Inner Planets¶
GM_MERCURY¶
module-attribute
¶
GM_MERCURY: float = 22031780000000.0
Convert a string or number to a floating-point number, if possible.
Value: 2.2031868551e13 m³/s²
GM_VENUS¶
module-attribute
¶
GM_VENUS: float = 324858592000000.0
Convert a string or number to a floating-point number, if possible.
Value: 3.257e14 m³/s²
GM_MARS¶
module-attribute
¶
GM_MARS: float = 42828375210000.0
Convert a string or number to a floating-point number, if possible.
Value: 4.305e13 m³/s²
Outer Planets¶
GM_JUPITER¶
module-attribute
¶
GM_JUPITER: float = 1.267127648e+17
Convert a string or number to a floating-point number, if possible.
Value: 1.268e17 m³/s²
GM_SATURN¶
module-attribute
¶
GM_SATURN: float = 3.79405852e+16
Convert a string or number to a floating-point number, if possible.
Value: 3.794e16 m³/s²
GM_URANUS¶
module-attribute
¶
GM_URANUS: float = 5794548600000000.0
Convert a string or number to a floating-point number, if possible.
Value: 5.794e15 m³/s²
GM_NEPTUNE¶
module-attribute
¶
GM_NEPTUNE: float = 6836527100580000.0
Convert a string or number to a floating-point number, if possible.
Value: 6.837e15 m³/s²
Dwarf Planets¶
GM_PLUTO¶
module-attribute
¶
GM_PLUTO: float = 977000000000.0
Convert a string or number to a floating-point number, if possible.
Value: 9.77e11 m³/s²