The measurement ofGusing the MSL torsion balance

Abstract

This paper describes the improvements that have been made to our measurement of the Newtonian gravitational constant (G) since our last published value of G in 1995. As a result of a new measurement of G made with the improved apparatus, we have discovered some second-order corrections that were omitted from the previous measurement. New values for G are presented; both from the latest measurement and a recalculated value from our previous measurement. Our latest values are G = 6.6742(7) × 10^-11 m³ kg^-1 s^-2 for the most recent measurement and G = 6.6746(10) × 10^-11 m³ kg^-1 s^-2 for the recalculated 1995 value. These two values agree to within their uncertainties.