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<-   EVRIS   ->

The EVRIS project, dedicated to sismology studies, went up on the Russian probe MARS 94/96. It was supposed to observe several bright stars, for a period of 20 days each, during the journey of the spacecraft towards Mars, which was supposed to last nine months.

The instrument was a small 9-cm telescope, attached to a stellar sensor used to maintain an accurate pointing direction.

  • The detector was a photomultiplier called Hamamatsu.
  • The system was fixed on the pointing platform PAIS built by the Russians, itself set up on the solar plates of the probe.

After a successful launch by a PROTON rocket from the cosmodrome of Baïkonour (a space center located in Kazakhstan), the ignition of the engines used to reach the interplanetary path didn't work correctly. The probe and its 46 experiments crashed on Earth, probably in the moutains of Bolivia...

The first CoRoT

In the call for ideas proposed by the CNES in 1993 for scientific missions on mini-satellites, the sismologists had the opportunity to rapidly launch a second generation instrument more powerful and more ambitious than EVRIS.


The main projects would be :

  • the improvement of the measure with a larger telescope, which allowed for the collection of more photons
  • the lengthening of the observation time.

The scientific program was for the detection of oscillations similar to those of the Sun in about ten brigtht stars.