IAU System¶

Namespace: mp_units::iau

Module: mp_units.systems

Header: <mp-units/systems/iau.h>

Units¶

Unit Name	Symbol	unit_symbol	Definition
`astronomical_unit`	au	—	alias to non_si::astronomical_unit
`jovian_mass`	M_♃ (M_JUP)	`M_JUP`	`nominal_jovian_mass_parameter / newtonian_constant_of_gravitation`
`parsec`	pc	`pc`	`astronomical_unit / (mag_ratio<1, 3600> * si::degree)`
`solar_mass`	M_☉ (M_SUN)	`M_SUN`	`nominal_solar_mass_parameter / newtonian_constant_of_gravitation`
`terrestrial_mass`	M_⊕ (M_EARTH)	`M_EARTH`	`nominal_terrestrial_mass_parameter / newtonian_constant_of_gravitation`

Constants¶

Name	Symbol	unit_symbol	Definition	Standard uncertainty
`newtonian_constant_of_gravitation`	G	`G`	alias to codata::newtonian_constant_of_gravitation	`mag_ratio<15, 10> * mag_power<10, -15> * cubic(si::metre) / si::kilogram / square(si::second)`
`nominal_jovian_equatorial_radius`	R_♃ₑᴺ (R_JUP_E_N)	`R_JUP_E_N`	`mag_ratio<71'492, 10'000> * mag_power<10, 7> * si::metre`	—
`nominal_jovian_mass_parameter`	(GM)♃ᴺ ((GM)JUP_N)	`GM_JUP_N`	`mag_ratio<12'668'653, 10'000'000> * mag_power<10, 17> * cubic(si::metre) / square(si::second)`	—
`nominal_jovian_polar_radius`	R_♃ₚᴺ (R_JUP_P_N)	`R_JUP_P_N`	`mag_ratio<66'854, 10'000> * mag_power<10, 7> * si::metre`	—
`nominal_solar_effective_temperature`	Tₑff,☉ᴺ (T_EFF_SUN_N)	`T_EFF_SUN_N`	`mag<5772> * si::kelvin`	—
`nominal_solar_luminosity`	L_☉ᴺ (L_SUN_N)	`L_SUN_N`	`mag_ratio<3'828, 1'000> * mag_power<10, 26> * si::watt`	—
`nominal_solar_mass_parameter`	(GM)☉ᴺ ((GM)SUN_N)	`GM_SUN_N`	`mag_ratio<13'271'244, 10'000'000> * mag_power<10, 20> * cubic(si::metre) / square(si::second)`	—
`nominal_solar_radius`	R_☉ᴺ (R_SUN_N)	`R_SUN_N`	`mag_ratio<6'957, 1'000> * mag_power<10, 8> * si::metre`	—
`nominal_terrestrial_equatorial_radius`	R_⊕ₑᴺ (R_EARTH_E_N)	`R_EARTH_E_N`	`mag_ratio<63'781, 10'000> * mag_power<10, 6> * si::metre`	—
`nominal_terrestrial_mass_parameter`	(GM)⊕ᴺ ((GM)EARTH_N)	`GM_EARTH_N`	`mag_ratio<3'986'004, 1'000'000> * mag_power<10, 14> * cubic(si::metre) / square(si::second)`	—
`nominal_terrestrial_polar_radius`	R_⊕ₚᴺ (R_EARTH_P_N)	`R_EARTH_P_N`	`mag_ratio<63'568, 10'000> * mag_power<10, 6> * si::metre`	—
`nominal_total_solar_irradiance`	S_☉ᴺ (S_SUN_N)	`S_SUN_N`	`mag<1361> * si::watt / square(si::metre)`	—

Constants with a standard uncertainty are measured rather than exact by definition, and satisfy the MeasuredConstant concept. The uncertainty is stated in the form its source publishes: an absolute value in the constant's own dimension, or a relative one (marked (relative)) when only that form is published. A — means no uncertainty is declared for that constant.