Le seuil des 5000 exoplanètes découvertes dépassé, selon la NASA
Les 65 derniers mondes extrasolaires ont été ajoutés aux archives le 21 mars de cette année. Mais tout cela n'est qu'une minuscule fraction ...
CHEOPS
Aujourd'hui, selon les spécialistes, une nouvelle ère s'ouvre dans la découverte des exoplanètes: le télescope spatial TESS (Transiting Exoplanet Survey Satellite) de la NASA, lancé en 2018, Hubble de la NASA et de l'Agence spatiale européenne (ESA), opérationnel depuis 1990, et <anchor>CHEOPS</anchor> (Characterising Exoplanets Satellite) de l'Université de Berne et l'ESA, à l'œuvre depuis 2019, seront bientôt aidés par une nouvelle génération d'appareils plus puissants et plus sensibles.
ESA - Cheops
ESA - Cheops

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[Science & Exploration](/Science_Exploration)

# Cheops

Characterising exoplanets known to be orbiting around nearby bright stars

![Cheops](/var/esa/storage/images/science_exploration/space_science/cheops/19717129-9-eng-GB/Cheops_pillars.jpg)

## The mission

Cheops is ESA's **CH** aracterising **E** x **OP** lanet **S** atellite. It is the first space 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 focuses 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:** Europe's Spaceport in French Guiana
- **Launch vehicle:** Soyuz-Fregat
- **Orbit:** Sun-synchronous, dusk-dawn orbit at 700 km above Earth

![](/var/esa/storage/images/science_exploration/space_science/cheops/19729405-26-eng-GB/Cheops_pillars.png)

- **1.5 m** size
- **280 kg** mass
- **19×19** arcmin field of view
- **1.2** Gbit/day data

![Cheops](/var/esa/storage/images/science_exploration/space_science/cheops/19731451-13-eng-GB/Cheops.jpg)

## Latest

AllStoriesVideosImages

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![Artist impression of glory on exoplanet WASP-76b](/var/esa/storage/images/esa_multimedia/images/2024/04/artist_impression_of_glory_on_exoplanet_wasp-76b/26009127-1-eng-GB/Artist_impression_of_glory_on_exoplanet_WASP-76b_card_medium.jpg)Science & Exploration **First ‘glory’ on hellish distant world?**\
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29/11/20238646 views134 likes\
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![](/var/esa/storage/images/esa_multimedia/images/2023/07/exoplanet_ltt9779_b_orbiting_its_host_star/24981260-1-eng-GB/Exoplanet_LTT9779_b_orbiting_its_host_star_card_medium.png)Science & Exploration **Cheops shows scorching exoplanet acts like a mirror**\
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10/07/202322570 views121 likes\
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Read![Read](/extension/pillars/design/pillars/images/arrow.svg)](/Science_Exploration/Space_Science/Cheops/Cheops_shows_scorching_exoplanet_acts_like_a_mirror)

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Science & Exploration **Cheops explores mysterious warm mini-Neptunes**\
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08/06/20235100 views100 likes\
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View![View](/extension/pillars/design/pillars/images/arrow-white.svg)](/ESA_Multimedia/Images/2023/05/Cheops_explores_mysterious_warm_mini-Neptunes)

[Video00:00:57\
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20/03/20235436 views162 likes\
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Play![Play](/extension/pillars/design/pillars/images/arrow-white.svg)](/ESA_Multimedia/Videos/2023/03/ESA_s_exoplanet_missions)

[Story\
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![](/var/esa/storage/images/esa_multimedia/images/2023/01/artist_impression_of_quaoar_and_its_ring/24681874-1-eng-GB/Artist_impression_of_Quaoar_and_its_ring_card_medium.jpg)Science & Exploration **ESA’s Cheops finds an unexpected ring around dwarf planet Q…**\
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08/02/202332535 views167 likes\
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Read![Read](/extension/pillars/design/pillars/images/arrow.svg)](/Science_Exploration/Space_Science/Cheops/ESA_s_Cheops_finds_an_unexpected_ring_around_dwarf_planet_Quaoar)

[Image\
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Science & Exploration **Artist impression of planet WASP-103b and its host star**\
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11/01/20223463 views40 likes\
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![](/var/esa/storage/images/esa_multimedia/images/2022/01/artist_impression_of_planet_wasp-103b_and_its_host_star/23888007-1-eng-GB/Artist_impression_of_planet_WASP-103b_and_its_host_star_card_full.png)\
View![View](/extension/pillars/design/pillars/images/arrow-white.svg)](/ESA_Multimedia/Images/2022/01/Artist_impression_of_planet_WASP-103b_and_its_host_star)

[Image\
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Science & Exploration **Cheops reveals a rugby ball-shaped exoplanet**\
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11/01/20223187 views24 likes\
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![](/var/esa/storage/images/esa_multimedia/images/2022/01/cheops_reveals_a_rugby_ball-shaped_exoplanet/23887963-1-eng-GB/Cheops_reveals_a_rugby_ball-shaped_exoplanet_card_full.png)\
View![View](/extension/pillars/design/pillars/images/arrow-white.svg)](/ESA_Multimedia/Images/2022/01/Cheops_reveals_a_rugby_ball-shaped_exoplanet)

[Story\
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![](/var/esa/storage/images/esa_multimedia/images/2022/01/artist_impression_of_planet_wasp-103b_and_its_host_star/23888007-1-eng-GB/Artist_impression_of_planet_WASP-103b_and_its_host_star_card_medium.png)Science & Exploration **Cheops reveals a rugby ball-shaped exoplanet**\
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11/01/202221527 views160 likes\
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Read![Read](/extension/pillars/design/pillars/images/arrow.svg)](/Science_Exploration/Space_Science/Cheops/Cheops_reveals_a_rugby_ball-shaped_exoplanet)

[Image\
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Science & Exploration **Exoplanet system artwork**\
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07/12/20213010 views137 likes\
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![Exoplanet system artwork](/var/esa/storage/images/esa_multimedia/images/2021/12/exoplanet_system_artwork/23832665-1-eng-GB/Exoplanet_system_artwork_card_full.png)\
View![View](/extension/pillars/design/pillars/images/arrow-white.svg)](/ESA_Multimedia/Images/2021/12/Exoplanet_system_artwork)

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Science & Exploration **ESA’s new and future exoplanet missions**\
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07/12/202110383 views124 likes\
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View![View](/extension/pillars/design/pillars/images/arrow-white.svg)](/ESA_Multimedia/Images/2021/12/ESA_s_new_and_future_exoplanet_missions)

[Video00:03:00\
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![Play](/extension/pillars/design/pillars/images/play-button.svg)\
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![](/var/esa/storage/images/esa_multimedia/videos/2020/04/cheops_the_science_begins/21904777-5-eng-GB/Cheops_the_science_begins_card_medium.jpg)Science & Exploration **Cheops: the science begins**\
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16/04/20208543 views127 likes\
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Play![Play](/extension/pillars/design/pillars/images/arrow-white.svg)](/ESA_Multimedia/Videos/2020/04/Cheops_the_science_begins)

[Video00:03:14\
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![Play](/extension/pillars/design/pillars/images/play-button.svg)\
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![](/var/esa/storage/images/esa_multimedia/videos/2020/01/cheops_launch_preparations/21810854-1-eng-GB/Cheops_launch_preparations_card_medium.jpg)Science & Exploration **Cheops launch preparations**\
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29/01/20203051 views41 likes\
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Play![Play](/extension/pillars/design/pillars/images/arrow-white.svg)](/ESA_Multimedia/Videos/2020/01/Cheops_launch_preparations)

[Video01:38:00\
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![Play](/extension/pillars/design/pillars/images/play-button.svg)\
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![](/var/esa/storage/images/esa_multimedia/videos/2019/12/press_briefing_cheops_launch/21537288-2-eng-GB/Press_briefing_Cheops_launch_card_medium.jpg)Science & Exploration **Press briefing Cheops launch**\
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23/12/20191842 views12 likes\
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Play![Play](/extension/pillars/design/pillars/images/arrow-white.svg)](/ESA_Multimedia/Videos/2019/12/Press_briefing_Cheops_launch)

[Video00:02:00\
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![Play](/extension/pillars/design/pillars/images/play-button.svg)\
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![](/var/esa/storage/images/esa_multimedia/videos/2019/12/cheops_liftoff/21528007-1-eng-GB/Cheops_liftoff_card_medium.jpg)Science & Exploration **Cheops liftoff**\
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18/12/201911010 views179 likes\
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Play![Play](/extension/pillars/design/pillars/images/arrow-white.svg)](/ESA_Multimedia/Videos/2019/12/Cheops_liftoff)

[**More items**](/Science_Exploration/Space_Science/Cheops/(archive)/0)

- Video

Science & Exploration

### Cheops: the science begins



16/04/20208543 views127 likes

[Play![Open item](/extension/pillars/design/pillars/images/arrow.svg)](/ESA_Multimedia/Videos/2020/04/Cheops_the_science_begins)



![](/var/esa/storage/images/esa_multimedia/videos/2020/04/cheops_the_science_begins/21904777-5-eng-GB/Cheops_the_science_begins_pillars.jpg)


## Recommended

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Science & Exploration **Cheops overview**![Transiting exoplanet](/var/esa/storage/images/esa_multimedia/images/2019/02/transiting_exoplanet/19220628-1-eng-GB/Transiting_exoplanet_card_full.jpg)\
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Science & Exploration **Cheops brochure**![Cheops mission poster](/var/esa/storage/images/esa_multimedia/images/2019/02/cheops_mission_poster/19265844-3-eng-GB/Cheops_mission_poster_card_full.jpg)\
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Open![Open](/extension/pillars/design/pillars/images/arrow.svg)](https://esamultimedia.esa.int/docs/science/CHEOPS-MEDIAKIT_FA_2019-12-09.pdf)

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Science & Exploration **Cheops paper model**![Cheops paper model cover](/var/esa/storage/images/esa_multimedia/images/2019/10/cheops_paper_model_cover/20821720-1-eng-GB/Cheops_paper_model_cover_card_full.png)\
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Open![Open](/extension/pillars/design/pillars/images/arrow-white.svg)](http://sci.esa.int/cheops/59851-cheops-paper-model/)

[Image\
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Science & Exploration **Exoplanet mission timeline**\
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## More

### About exoplanets

[What are exoplanets?](/Science_Exploration/Space_Science/Exoplanets/What_are_exoplanets) [How to find an exoplanet](/Science_Exploration/Space_Science/Exoplanets/How_to_find_an_exoplanet)

### About Cheops

[What is Cheops?](/Science_Exploration/Space_Science/Cheops/What_is_Cheops) [How to characterise an exoplanet](/Science_Exploration/Space_Science/Cheops/How_to_characterise_an_exoplanet) [The first of three](/Science_Exploration/Space_Science/Cheops/The_first_of_three) [Designing and building Cheops](/Science_Exploration/Space_Science/Cheops/Designing_and_building_Cheops) [An international collaboration](http://www.esa.int/spaceinimages/Images/2019/03/Countries_contributing_to_Cheops) [Cheops Consortium](http://cheops.unibe.ch) [Launch and orbit](/Science_Exploration/Space_Science/Cheops/Launch_and_orbit) [Science operations](/Science_Exploration/Space_Science/Cheops/Science_operations)

### Multimedia

[Cheops images](http://www.esa.int/spaceinimages/content/search?SearchText=cheops&img=1&SearchButton=Go) [Cheops videos](http://www.esa.int/ESA_Multimedia/Search?SearchText=cheops&result_type=videos)

### Follow Cheops

[@ESA\_CHEOPS](https://twitter.com/ESA_Cheops) [@esascience](https://twitter.com/esascience)

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