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<p>We investigate a miniaturized prototype of gravimeter named B-grav to overview different metrological questions to resolve for a system as part of a geophysical instrument package set-up on an asteroid lander. It must meter with 1% tentative accuracy of a weak 50&#xa0;µm/sec<sup>2</sup> gravity field in a harsh environment with very strict limitations of inclusion in a CubeSat. With its 3D orthogonal components, our system allows to determine gravity in amplitude and in angular position without levelling. B-grav in-situ calibrations are based on centrifugal torques and electrostatic forcing. Simulation of asteroid gravity field in laboratory is applied to the pendulum set-up in a vertical position to reject the Earth gravity field. Expertise gained with the design of B-grav was applied for the development at the Royal Observatory of Belgium of the gravimeter GRASS.</p>

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Prototyping of B-grav to Prepare Gravimetric Mission of the GRASS on Asteroid Dimorphos

  • 期刊论文

  • 发表日期：

    2025年12月26日

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  • Michel Van Ruymbeke,
  • Birgit Ritter,
  • Matthias Noeker,
  • Elisa Tasev,
  • Sébastien Toussaint,
  • Justine Lebrun,
  • François Wielant,
  • Özgür Karatekin

摘要

We investigate a miniaturized prototype of gravimeter named B-grav to overview different metrological questions to resolve for a system as part of a geophysical instrument package set-up on an asteroid lander. It must meter with 1% tentative accuracy of a weak 50 µm/sec2 gravity field in a harsh environment with very strict limitations of inclusion in a CubeSat. With its 3D orthogonal components, our system allows to determine gravity in amplitude and in angular position without levelling. B-grav in-situ calibrations are based on centrifugal torques and electrostatic forcing. Simulation of asteroid gravity field in laboratory is applied to the pendulum set-up in a vertical position to reject the Earth gravity field. Expertise gained with the design of B-grav was applied for the development at the Royal Observatory of Belgium of the gravimeter GRASS.