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Astronomers commonly quote the properties of celestial objects in units ofparameters for the Sun, Jupiter, or the Earth. The resolution presented herewas proposed by the IAU Inter-Division Working Group on Nominal Units forStellar and Planetary Astronomy and passed by the XXIXth IAU General Assemblyin Honolulu. IAU 2015 Resolution B3 adopts a set of nominal solar, terrestrial,and jovian conversion constants for stellar and (exo)planetary astronomy whichare defined to be exact SI values. While the nominal constants are based oncurrent best estimates (CBEs; which have uncertainties, are not secularlyconstant, and are updated regularly using new observations), they should beinterpreted as standard values and not as CBEs. IAU 2015 Resolution B3 adoptsfive solar conversion constants (nominal solar radius, nominal total solarirradiance, nominal solar luminosity, nominal solar effective temperature, andnominal solar mass parameter) and six planetary conversion constants (nominalterrestrial equatorial radius, nominal terrestrial polar radius, nominal jovianequatorial radius, nominal jovian polar radius, nominal terrestrial massparameter, and nominal jovian mass parameter).

IAU 2015 Resolution B3 on Recommended Nominal Conversion Constants for Selected Solar and Planetary Properties