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In three previous papers we presented the LARES 2 space experiment aimed at avery accurate test of frame-dragging and at other tests of fundamental physicsand measurements of space geodesy and geodynamics. We presented the errorsources in the LARES 2 experiment, its error budget, Monte Carlo simulationsand covariance analyses confirming an accuracy of a few parts per thousand inthe test of frame-dragging, and we treated the error due to the uncertainty inthe de Sitter effect, a relativistic orbital perturbation. Here we discuss theimpact in the error budget of the LARES 2 frame-dragging experiment of theorbital perturbation due to thermal drag or thermal thrust. We show that thethermal drag induces an uncertainty of about one part per thousand in the LARES2 frame-dragging test, consistent with the error estimates in our previouspapers.

A new laser-ranged satellite for General Relativity and space geodesy: IV. Thermal drag and the LARES 2 space experiment