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After the approval by the Italian Space Agency of the LARES satellite, whichshould be launched at the end of 2009 with a VEGA rocket and whose claimed goalis a about 1% measurement of the general relativistic gravitomagneticLense-Thirring effect in the gravitational field of the spinning Earth, it isof the utmost importance to reliably assess the total realistic accuracy thatcan be reached by such a mission. The observable is a linear combination of thenodes of the existing LAGEOS and LAGEOS II satellites and of LARES able tocancel out the impact of the first two even zonal harmonic coefficients of themultipolar expansion of the classical part of the terrestrial gravitationalpotential representing a major source of systematic error. While LAGEOS andLAGEOS II fly at altitudes of about 6000 km, LARES will be placed at analtitude of 1450 km. Thus, it will be sensitive to much more even zonals thanLAGEOS and LAGEOS II. Their corrupting impact \delta\mu has been evaluated byusing the standard Kaula's approach up to degree L=70 along with the sigmas ofthe covariance matrices of eight different global gravity solutions(EIGEN-GRACE02S, EIGEN-CG03C, GGM02S, GGM03S, JEM01-RL03B, ITG-Grace02s,ITG-Grace03, EGM2008) obtained by five institutions (GFZ, CSR, JPL, IGG, NGA)with different techniques from long data sets of the dedicated GRACE mission.It turns out \delta\mu about 100-1000% of the Lense-Thirring effect. Animprovement of 2-3 orders of magnitude in the determination of the high degreeeven zonals would be required to constrain the bias to about 1-10%.

Will the recently approved LARES mission be able to measure the Lense-Thirring effect at 1%?