ssapy.constants

A collection of physical constants.

ssapy.constants.WGS84_EARTH_MU[source]: Earth gravitational constant from WGS84 model [m³/s²]

ssapy.constants.WGS72_EARTH_MU[source]: Earth gravitational constant from WGS72 model [m³/s²]

ssapy.constants.WGS84_EARTH_OMEGA[source]: Earth angular velocity from WGS84 model [rad/s]

ssapy.constants.WGS72_EARTH_OMEGA[source]: Earth angular velocity from WGS72 model [rad/s]

ssapy.constants.WGS84_EARTH_RADIUS[source]: Earth radius at equator from WGS84 model [m]

ssapy.constants.WGS72_EARTH_RADIUS[source]: Earth radius at equator from WGS72 model [m]

ssapy.constants.WGS84_EARTH_FLATTENING[source]: Earth flattening f = (a - b) / a where a and b are the major and minor axes respectively, from WGS84 model [unitless]

ssapy.constants.WGS72_EARTH_FLATTENING[source]: Earth flattening f = (a - b) / a where a and b are the major and minor axes respectively, from WGS72 model [unitless]

ssapy.constants.WGS84_EARTH_POLAR_RADIUS[source]: Earth polar radius, calculated by multiplying the equatorial radius by (1 - flattening), from WGS84 model [m]

ssapy.constants.WGS72_EARTH_POLAR_RADIUS[source]: Earth polar radius, calculated by multiplying the equatorial radius by (1 - flattening), from WGS72 model [m]

ssapy.constants.RGEO[source]: GEO-synchronous radius [m]

ssapy.constants.VGEO[source]: GEO-synchronous velocity [m/s]

ssapy.constants.RGEOALT[source]: GEO-synchronous altitude [m]

ssapy.constants.VLEO[source]: Approximate orbital velocity for low earth orbit (altitude of 500km) [m/s]

ssapy.constants.LD[source]: Lunar semi-major axis [m]

Gravitational constants

ssapy.constants.SUN_MU[source]: Sun gravitational constant, from IAU 1976 model [m³/s²]

ssapy.constants.MOON_MU[source]: Moon gravitational constant, from the DE200 ephemeris [m³/s²]

ssapy.constants.MERCURY_MU[source]: Mercury gravitational constant [m³/s²]

ssapy.constants.VENUS_MU[source]: Venus gravitational constant [m³/s²]

ssapy.constants.EARTH_MU[source]: Earth gravitational constant, from WGS84 model [m³/s²]

ssapy.constants.MARS_MU[source]: Mars gravitational constant [m³/s²]

ssapy.constants.JUPITER_MU[source]: Jupiter gravitational constant [m³/s²]

ssapy.constants.SATURN_MU[source]: Saturn gravitational constant [m³/s²]

ssapy.constants.URANUS_MU[source]: Uranus gravitational constant [m³/s²]

ssapy.constants.NEPTUNE_MU[source]: Neptune gravitational constant [m³/s²]

Mass

ssapy.constants.SUN_MASS[source]: Sun mass, from the DE405 ephemeris [kg]

ssapy.constants.MOON_MASS[source]: Moon mass, from the DE405 ephemeris [kg]

ssapy.constants.MERCURY_MASS[source]: Mercury mass, from the DE405 ephemeris [kg]

ssapy.constants.VENUS_MASS[source]: Venus mass, from the DE405 ephemeris [kg]

ssapy.constants.EARTH_MASS[source]: Earth mass, from the DE405 ephemeris [kg]

ssapy.constants.MARS_MASS[source]: Mars mass, from the DE405 ephemeris [kg]

ssapy.constants.JUPITER_MASS[source]: Jupiter mass, from the DE405 ephemeris [kg]

ssapy.constants.SATURN_MASS[source]: Saturn mass, from the DE405 ephemeris [kg]

ssapy.constants.URANUS_MASS[source]: Uranus mass, from the DE405 ephemeris [kg]

ssapy.constants.NEPTUNE_MASS[source]: Neptune mass, from the DE405 ephemeris [kg]

Radius

ssapy.constants.MOON_RADIUS[source]: Moon radius (source: 10.2138/rmg.2006.60.3) [m]

ssapy.constants.MERCURY_RADIUS[source]: Mercury radius [m]

ssapy.constants.VENUS_RADIUS[source]: Venus radius [m]

ssapy.constants.EARTH_RADIUS[source]: Earth radius [m]

ssapy.constants.MARS_RADIUS[source]: Mars radius [m]

ssapy.constants.JUPITER_RADIUS[source]: Jupiter radius [m]

ssapy.constants.SATURN_RADIUS[source]: Saturn radius [m]

ssapy.constants.URANUS_RADIUS[source]: Uranus radius [m]

ssapy.constants.NEPTUNE_RADIUS[source]: Neptune radius [m]