IAU 2015 Resolution B3 on Recommended Nominal Conversion Constants for
  Selected Solar and Planetary Properties
  Astronomers commonly quote the properties of celestial objects in units of
parameters for the Sun, Jupiter, or the Earth. The resolution presented here
was proposed by the IAU Inter-Division Working Group on Nominal Units for
Stellar and Planetary Astronomy and passed by the XXIXth IAU General Assembly
in Honolulu. IAU 2015 Resolution B3 adopts a set of nominal solar, terrestrial,
and jovian conversion constants for stellar and (exo)planetary astronomy which
are defined to be exact SI values. While the nominal constants are based on
current best estimates (CBEs; which have uncertainties, are not secularly
constant, and are updated regularly using new observations), they should be
interpreted as standard values and not as CBEs. IAU 2015 Resolution B3 adopts
five solar conversion constants (nominal solar radius, nominal total solar
irradiance, nominal solar luminosity, nominal solar effective temperature, and
nominal solar mass parameter) and six planetary conversion constants (nominal
terrestrial equatorial radius, nominal terrestrial polar radius, nominal jovian
equatorial radius, nominal jovian polar radius, nominal terrestrial mass
parameter, and nominal jovian mass parameter).
