# IAU System **Namespace:** `mp_units::iau` **Module:** `mp_units.systems` **Header:** `` ## Units | Unit Name | Symbol | unit_symbol | Definition | |-----------|:------:|:-----------:|------------| | codata2018::jovian_mass | M_♃ (M_JUP) | `M_JUP` | [nominal_jovian_mass_parameter](#nominal_jovian_mass_parameter) / [newtonian_constant_of_gravitation](#codata2018-newtonian_constant_of_gravitation) | | codata2018::newtonian_constant_of_gravitation | G | `G` | mag_ratio<667'430, 100'000> * mag_power<10, -11> * cubic([si::metre](si.md#metre)) / [si::kilogram](si.md#kilogram) / square([si::second](si.md#second)) | | codata2018::solar_mass | M_☉ (M_SUN) | `M_SUN` | [nominal_solar_mass_parameter](#nominal_solar_mass_parameter) / [newtonian_constant_of_gravitation](#codata2018-newtonian_constant_of_gravitation) | | codata2018::terrestrial_mass | M_⊕ (M_EARTH) | `M_EARTH` | [nominal_terrestrial_mass_parameter](#nominal_terrestrial_mass_parameter) / [newtonian_constant_of_gravitation](#codata2018-newtonian_constant_of_gravitation) | | 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](si.md#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](si.md#metre)) / square([si::second](si.md#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](si.md#metre) | | nominal_solar_effective_temperature | Tₑff,☉ᴺ (T_EFF_SUN_N) | `T_EFF_SUN_N` | mag<5772> * [si::kelvin](si.md#kelvin) | | nominal_solar_luminosity | L_☉ᴺ (L_SUN_N) | `L_SUN_N` | mag_ratio<3'828, 1'000> * mag_power<10, 26> * [si::watt](si.md#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](si.md#metre)) / square([si::second](si.md#second)) | | nominal_solar_radius | R_☉ᴺ (R_SUN_N) | `R_SUN_N` | mag_ratio<6'957, 1'000> * mag_power<10, 8> * [si::metre](si.md#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](si.md#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](si.md#metre)) / square([si::second](si.md#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](si.md#metre) | | nominal_total_solar_irradiance | S_☉ᴺ (S_SUN_N) | `S_SUN_N` | mag<1361> * [si::watt](si.md#watt) / square([si::metre](si.md#metre)) | | parsec | pc | `pc` | [astronomical_unit](si.md#astronomical_unit) / (mag_ratio<1, 3600> * [si::degree](si.md#degree)) | !!! note "Inline Namespaces" The `mp_units::iau::codata2018` namespace is inline in `mp_units::iau`, making its units directly accessible from the parent namespace.