ESA title

The mission

Cheops is ESA's CHaracterising ExOPlanet Satellite. It is the first mission dedicated to studying bright, nearby stars that are already known to host exoplanets, in order to make high-precision observations of the planet's size as it passes in front of its host star. It will focus on planets in the super-Earth to Neptune size range, with its data enabling the bulk density of the planets to be derived – a first-step characterisation towards understanding these alien worlds.

The launch

  • Launch date: 18 December 2019
  • Launch site: Kourou, French Guiana
  • Launcher: Soyuz-Fregat
  • Orbit: Sun-synchronous, dusk-dawn orbit at 700 km above Earth


Artist impression of the TOI-178 planetary system
Science & Exploration

ESA’s exoplanet watcher Cheops reveals unique planetary sys…

25/01/2021 12866 views 168 likes
Artist impression of WASP-189
Science & Exploration

First results from Cheops: ESA’s exoplanet observer reveals…

28/09/2020 9795 views 96 likes
Artist's impression of star HD 93396 and its hot Jupiter planet, KELT-11b
Science & Exploration

Cheops observes its first exoplanets and is ready for scien…

16/04/2020 8242 views 71 likes
Cheops image of its first target star
Science & Exploration

A perfect blur – First image by exoplanet watcher Cheops

07/02/2020 8128 views 33 likes
Artist's impression of Cheops
Science & Exploration

Cheops opens its eye to the sky

29/01/2020 5894 views 44 likes

More items

  • Science & Exploration

    Watch Cheops launch live

    17/12/2019 26215 views 122 likes
    Open item
    Cheops launch