Constraints on chameleon gravity from the measurement of the electrostatic stiffness of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>M</mml:mi><mml:mi>I</mml:mi><mml:mi>C</mml:mi><mml:mi>R</mml:mi><mml:mi>O</mml:mi><mml:mi>S</mml:mi><mml:mi>C</mml:mi><mml:mi>O</mml:mi><mml:mi>P</mml:mi><mml:mi>E</mml:mi></mml:math> mission accelerometers

This article is dedicated to the use MICROSCOPE mission's data test chameleon theory of gravity. We take advantage technical sessions aimed characterize electrostatic stiffness MICROSCOPE's instrument intrinsic its capacitive measurement system. Any discrepancy between expected and measured may result from unaccounted-for contributors, i.e. extra-forces. work considers case gravity as a possible contributor. It was previously shown that in situations similar these sessions, fifth force appears acts for small displacements. The magnitude this new component computed over chameleon's parameter space. allows us derive constraints by excluding any inconsistent with data. As --since not designed purpose such an analysis--, bounds are competitive state-of-the-art constraints, but they could be improved better estimation all effects at play sessions. Hence our illustrates novel technique way constraining forces.