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MICROSCOPE

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NORAD ID: 41457
Int'l Code: 2016-025B
Perigee: 718.1 km
Apogee: 720.8 km
Inclination: 98.2 °
Period: 99.0 minutes
Semi major axis: 7090 km
RCS: Unknown
Launch date: April 26, 2016
Source: France (FR)
Launch site: FRENCH GUIANA (FRGUI)

MICROSCOPE (Micro-Satellite à traînée Compensée pour l’Observation du Principe d’Equivalence) is a satellite that will test the equivalence principle described by Albert Einstein, with a precision on the order of 10-15. In space, it is possible to study the relative motion of two bodies in almost perfect and permanent free fall aboard an orbiting satellite, shielded from perturbations encountered on Earth (notably seismic), over the course of several months. To achieve this, two concentric cylindrical test masses made of different materials – one titanium and one a platinum-rhodium alloy – will be minutely controlled to keep them motionless with respect to the satellite inside independent differential electrostatic accelerometers. If the equivalence principle is verified, the two masses will be subjected to the same control acceleration. If different accelerations have to be applied, the principle will be violated: an event that would shake the foundations of physics.
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 41457U 16025B   19326.13910163  .00000137  00000-0  42973-4 0  9990
2 41457  98.2426 328.7707 0001860  75.9236 284.2168 14.54092172189650
Source of the keplerian elements: AFSPC