Values of some astronomical constants proposed for NSFA

Improved values for the masses of Ceres, Pallas, Vesta, the Earth-Moon mass ratio, and the Astronomical Unit are hereby proposed to the NSFA WG (the IAU Working Group on Numerical Standards for Fundamental Astronomy) as current best estimates. These value are based upon the improvements of planetary ephemerides carried out by the authors at IAA RAS and at Caltech/JPL, respectively; comparisons of the values with those of other researchers ensure their reliability and provide realistic estimates of their uncertainties.