Current estimates of mean Earth ellipsoid parameters

Independent estimates of a, J 2 , kM E (of the solid earth), R o (scale factor for lengths), γ e (equatorial gravity) and a fixed ω are used in a weighted least squares adjustment to determine adjusted values for the variable parameters assuming a rotational equipotential ellipsoid as the figure of reference. The adjusted values are: kM E = (3.9860034±0.0000023)×10 14 m³/sec²; γ e = 978031.69±0.77 mgals; f = 1/(298.25636±0.00147); R o = 6363674.98±2.50 m, a = 6378139.0±2.51m and W o (the geoid potential) = 6263681.62kgal m.