CHEOPS

Short description: Optical space telescope (launched in 2019)

Characterising Exoplanets Satellite (CHEOPS)

An artist's impression of the CHEOPS space observatory

Mission type| Exoplanetology, astrophysics
Operator| Swiss Space Office / ESA
COSPAR ID| 2019-092B
SATCAT no.| 44874
Website| cheops.unibe.ch
sci.esa.int/cheops
Mission duration| 3.5 years (nominal)
\+ 3 years (extended)[1]
Elapsed: 6 years, 5 months and 1 day (in progress)
Spacecraft properties
Spacecraft type| Space observatory
Bus| SEOSAT[2]
Manufacturer| Airbus Defence and Space (Spain )
Launch mass| 273 kg [3]
Payload mass| 58 kg [4]
Dimensions| 1.5 × 1.5 × 1.5 m (4 ft 11 in × 4 ft 11 in × 4 ft 11 in)
Power| 64 watts [5]
Start of mission
Launch date| 18 December 2019, 08:54:20 UTC[6]
Rocket| Soyuz-ST-A (Soyuz VS23) [7][8]
Launch site| Centre Spatial Guyanais, ELS
Contractor| Arianespace
Orbital parameters
Reference system| Geocentric orbit[9]
Regime| Sun-synchronous orbit
Perigee altitude| 712 km (442 mi)
Apogee altitude| 715 km (444 mi)
Inclination| 92.80°
Period| 90.00 minutes
Main telescope
Type| Ritchey–Chrétien
frame-transfer back-side illuminated CCD
Diameter| 32 cm [10]
Focal ratio| f/8
Wavelengths| 330 to 1100 nm
Transponders
Capacity| 1.2 Gbit/day downlink [11]
Instruments
Photometer[12]

CHEOPS mission patch

Cosmic Vision

<- BepiColombo

Solar Orbiter ->

CHEOPS (CHaracterising ExOPlanets Satellite) is a European space telescope. Its objective is to determine the size of known extrasolar planets, which will allow the estimation of their mass, density, composition and their formation. Launched on 18 December 2019, it is the first Small-class mission in ESA's Cosmic Vision science programme.[13]

The small satellite features an optical Ritchey–Chrétien telescope with an aperture of 30 cm, mounted on a standard small satellite platform. It was placed into a Sun-synchronous orbit of about 700 km altitude.

## Contents

* 1 Science overview
* 2 History
* 2.1 Prior to launch
* 2.2 Launch
* 2.3 First light
* 3 Spacecraft design
* 3.1 Sunshield
* 3.2 Attitude and Orbit Control System (AOCS)
* 4 CHEOPS Instrument System (CIS)
* 4.1 Plaques
* 5 Goals
* 5.1 Observation priorities
* 6 Results
* 7 See also
* 8 References
* 9 External links

## Science overview

Thousands of exoplanets have been discovered by the end of the 2010s;[14] some have minimum mass measurements from the radial velocity method while others that are seen to transit their parent stars have measures of their physical size. Few exoplanets to date have highly accurate measures for both mass and radius, limiting the ability to study the variety in bulk density that would provide clues as to what materials they are made of and their formation history.[15]

For the planned mission duration of 3.5 years, CHEOPS is to measure the size of known transiting exoplanets orbiting bright and nearby stars,[16] as well as search for predicted transits of exoplanets previously discovered via radial velocity. Scientists behind the project expect these well-characterised transiting exoplanets to be prime targets for future observatories such as James Webb Space Telescope (JWST) or the extremely large telescopes.[17]

In 2023, the mission was extended to 2026. During the extended mission CHEOPS is expected to also search for exomoons. [1]

## History

### Prior to launch

The CHEOPS' mirror

Organized as a partnership between the European Space Agency (ESA) and the Swiss Space Office, CHEOPS was selected in October 2012 from among 26 proposals as the first S-class ("small") space mission in ESA's Cosmic Vision programme.[16] ESA is the mission architect and responsible for the spacecraft and launch opportunity procurement. The project is led by the Center for Space and Habitability at the University of Bern, Switzerland, with contributions from other Swiss and European universities. The Principal Investigator for the science instrument is Willy Benz at the University of Bern and the Principal Scientist from ESA is Kate Isaak. After a competition phase, Airbus Defence and Space in Spain was selected as the spacecraft builder.[7][18] The ESA mission cost is capped at €50 million.[7] Media Lario S.r.l. (Italy) was responsible for the optical finishing of the primary optical element.[19]

### Launch

CHEOPS launched on board of a Soyuz-AT launch vehicle on 18 December 2019, at 08:54:20 UTC from Centre Spatial Guyanais (CSG) in Kourou, French Guiana.[6][20] CHEOPS separated after two hours and 23 minutes from lift-off.[21] The primary payload was the first satellite of ASI's COSMO-SkyMed Second Generation constellation, CSG 1. The launcher also deployed three CubeSats, including ESA's OPS-SAT.[13] CHEOPS went into a 712 km (442 mi) altitude Sun-synchronous polar orbit.

### First light

After the cover of the telescope was opened on 29 January 2020,[22] CHEOPS took its first light image on 7 February 2020. The image is centred on the star HD 70843, a yellow-white star located around 150 light years away. The star was selected because of its brightness and position on the sky. The stars in the image are blurry, which is intended. The defocused mirror distributes the light of the star over many pixels of the detector, making the measurements of starlight more precise.[23] The first light images were better than it was expected from tests in the laboratory. The images were smoother and more symmetrical, which could reduce noise caused by the detector and the spacecraft.[24]

In April 2020, the telescope began science operations.[25] See below for the results.

## Spacecraft design

The satellite has dimensions of approximately 1.5 × 1.5 × 1.5 m (4 ft 11 in × 4 ft 11 in × 4 ft 11 in) and a hexagonal base structure. The satellite bus of the CHEOPS spacecraft is based on the SEOSAT platform.[11]

### Sunshield

A sunshield mounted on the platform protects the radiator and detector housing against the Sun, and it also features solar panels for the electrical power subsystem. The sunshield wraps around the hexagonal bus.[11]

### Attitude and Orbit Control System (AOCS)

The control system is 3-axis stabilized, but nadir locked, ensuring that one of the spacecraft axes is always pointing towards the Earth. During each orbit, the spacecraft will slowly rotate around the telescope line-of-sight to keep the focal plane radiator oriented towards cold space, enabling passive cooling of the detector. The typical observation duration will be 48 hours. During a typical 48-hour observation CHEOPS will have a pointing stability of better than eight arcsec at 95% confidence.[11][26]

## CHEOPS Instrument System (CIS)

The detector, support electronics, telescope, back-end optics, instrument computer, and thermal regulation hardware are known collectively as the CHEOPS Instrument System (CIS). The required photometric precision will be achieved using a single frame-transfer, back-illuminated Charge-coupled device (CCD) detector from Teledyne e2v with 1024 × 1024 pixels and a pixel pitch of 13 µm. The CCD is mounted in the focal plane of the telescope, and will be passively cooled to 233 K (−40 °C), with a thermal stability of 10 mK. The telescope is a single medium-size f/8, on-axis Ritchey-Chrétien telescope with a 32 cm (13 in) aperture, mounted on a stiff optical bench.[27] The University of Geneva and the University of Bern provided the powerful photometer.[12] Target star images are deliberately defocussed to help accurate photometry.[23]

### Plaques

Two titanium plaques with thousands of miniaturised drawings by children have been fixed to CHEOPS. Each plaque measures nearly 18 × 24 cm (7.1 × 9.4 in). The plaques, prepared by a team at the Bern University of Applied Sciences were unveiled in a dedicated ceremony at RUAG on 27 August 2018.[28] The individual drawings can be found at the website of CHEOPS by clicking on a map of Europe.[29]

## Goals

The main goal of CHEOPS is the accurate measurement of the size (radii) of the exoplanets for which ground-based spectroscopic surveys have already provided mass estimates. Knowing both the mass and the size of the exoplanets will allow scientists to determine the planets' density and thus their approximate composition, such as whether they are gaseous or rocky. CHEOPS is the most efficient instrument to search for shallow transits and to determine accurate radii for known exoplanets in the super-Earth to Neptune mass range (1-6 Earth radius).[7]

CHEOPS measures photometric signals with a precision limited by stellar photon noise of 150 ppm/min for a 9th magnitude star. This corresponds to the transit of an Earth-sized planet orbiting a star of 0.9 R☉ in 60 days detected with a S/Ntransit >10 (100 ppm transit depth). For example, an Earth-size transit across a G star creates an 80 ppm depth.

The different science objectives require 500 separate target pointings. Assuming 1 hour per pointing the mission duration is estimated at 1175 days or 3.2 years. Together with the 20% of open time available for the community the total duration of the CHEOPS mission is estimated to be 3.5 years.[30]

The spacecraft is powered by solar panels that are also part of its sunshield. They provide 60 W continuous power for instrument operations and allow for at least a 1.2 gigabit/day data downlink capacity.[11] Data-taking started in early 2020.[31]

### Observation priorities

Eighty per cent of the science observing time on CHEOPS is dedicated to the CHEOPS Guaranteed Time Observing (GTO) Programme, under the responsibility of the CHEOPS Science Team (chaired by Didier Queloz).[32] The majority of the GTO programme involves the characterization of known transiting exoplanets and improvement of known parameters. Part of the GTO programme is to find transits of known exoplanets that were confirmed by other techniques, such as radial-velocity, but not by the transit-method. Another part of the GTO programme includes exploration of multi-systems and search of additional planets in those systems, for example using the transit-timing-variation (TTV) method.[33]

The other 20% of the science observing time on CHEOPS is made available to the scientific community in the form of an ESA-run Guest Observers' (GO) Programme. Researchers can submit proposals for observations with CHEOPS through an annual Announcements of Opportunity (AO) Program.[34] The approved AO-1 projects include observations of the hot jupiters HD 17156 b, Kelt-22A b,[35] warm jupiter K2-139b,[36] multi systems GJ 9827, K2-138, the exoplanet DS Tuc Ab,[37] 55 Cancri e (likely GTO),[38][39] WASP-189 b[40] and other exoplanet science related observations, such as planets around rapidly-rotating stars, planet material around white dwarfs and searching for transiting exocomets around 5 Vulpeculae.[41]

## Results

HD 108236 f was discovered with CHEOPS.[42]

A study of WASP-189b (a 'hot Jupiter') has been published.[43]

TOI-178 has been found to have 6 planets, 5 having orbital resonances.[44] Planetary densities have been calculated.

CHEOPS, supplemented by TESS data, characterized AU Mic and its planet b. It also confirmed transit-timing variations, caused by the outer planets.[45]

TOI-561 is a multi-planet system that was studied with CHEOPS, HARPS-N and TESS. The study confirmed that TOI-561 b is the lowest density ultra-short period planet.[46]

CHEOPS observed occultations caused by the planet 55 Cancri e and was able to observe individual occultations for the first time.[47]

A study searching for transits around 6 white dwarfs did not detect any transits[48] and a study to search for exomoons around v2 Lupi d was unable to detect any additional transits. The full transit of v2 Lupi d was observed for the first time with CHEOPS, potentially aiding any future searches for exomoons around this planet.[49]

CHEOPS also sees trails from other satellites during its observations, since it is in low Earth orbit.[50]

## See also

* List of exoplanet search projects
* Astronomy:CoRoT
* Astronomy:Kepler space telescope
* MOST - Canada's first space telescope
* PLATO - European space telescope to detect exoplanets
* Transiting Exoplanet Survey Satellite (TESS)
* Astronomy:List of space telescopes - None

## References

1. ↑ 1.0 1.1 "CHEOPS mission extended". 2023-03-08. https://www.unibe.ch/news/media_news/media_relations_e/media_releases/2023/media_releases_2023/cheops_mission_extended/index_eng.html.
2. ↑ CHEOPS, EO Portal Directory Accessed on 14 December 2019
3. ↑ "Press Kit VS-23 Launch (in French)". Arianespace. https://www.arianespace.com/wp-content/uploads/2019/12/VS23-launchkit-FR.pdf.
4. ↑ "The CHEOPS Payload: a single telescope". CHEOPS website. https://cheops.unibe.ch/mission/the-cheops-payload-a-single-telescope.
5. ↑ "CHEOPS – Executive Summary". https://cheops.unibe.ch/mission/executive-summary.
6. ↑ 6.0 6.1 "Flight VS23: Soyuz lifts off from the Spaceport in French Guiana". Arianespace. https://www.arianespace.com/mission-update/flight-vs23-soyuz-lifts-off-from-the-spaceport-in-french-guiana/.
7. ↑ 7.0 7.1 7.2 7.3 exoplanet mission meets key milestones en route to 2017 launch ESA 11 July 2014
8. ↑ CHEOPS has arrived in Kourou 16 October 2019
9. ↑ "VS23 Launch Press Kit". Arianespace. December 2019. https://www.arianespace.com/wp-content/uploads/2019/12/VS23-launchkit-EN.pdf.
10. ↑ "CHEOPS – Mission Status & Summary". https://cheops.unibe.ch/mission/status.
11. ↑ 11.0 11.1 11.2 11.3 11.4 Stettler, Ulrich. "Spacecraft". https://cheops.unibe.ch/cheops-mission/spacecraft/.
12. ↑ 12.0 12.1 Europe's Cheops telescope launches to study far-off worlds. Jonathan Amos, BBC News 18 December 2019
13. ↑ 13.0 13.1 "Call for Media: Cheops launch to study exoplanets" (in en). https://www.esa.int/Newsroom/Press_Releases/Call_for_Media_Cheops_launch_to_study_exoplanets.
14. ↑ "ESA CHEOPS mission: Exoplanets in focus". https://www.dw.com/en/esa-cheops-mission-exoplanets-in-focus/a-51659828.
15. ↑ "ESA is about to launch a space telescope to study how planets are made". New Scientist. https://www.newscientist.com/article/2227589-esa-is-about-to-launch-a-space-telescope-to-study-how-planets-are-made/.
16. ↑ 16.0 16.1 "ESA Science Programme's new small satellite will study super-Earths". ESA. 19 October 2012. http://www.esa.int/esaCP/SEMXFG4S18H_index_0.html.
17. ↑ "ESA satellite set for launch to measure sizes of exoplanets". Spaceflight Now. https://spaceflightnow.com/2019/12/15/esa-satellite-set-for-launch-to-measure-sizes-of-exoplanets/.
18. ↑ "Who is Who in CHEOPS – CHEOPS – Cosmos". https://www.cosmos.esa.int/web/cheops/who-is-who-in-cheops.
19. ↑ "Cheops" (in it-IT). https://www.asi.it/esplorazione/sistema-solare/cheops/.
20. ↑ "Flight VS23: Launch rescheduled to December 18". Arianespace. https://www.arianespace.com/mission-update/flight-vs23-launch-rescheduled-to-december-18/.
21. ↑ "Airbus-built CHEOPS satellite successfully launched on Soyuz | Airbus". https://www.airbus.com/newsroom/press-releases/en/2019/12/airbusbuilt-cheops-satellite-successfully-launched-on-soyuz.html.
22. ↑ "Cover of CHEOPS Space Telescope Open". Unibe. 2020-01-29. https://www.unibe.ch/news/media_news/media_relations_e/media_releases/2020/media_releases_2020/cover_of_cheops_space_telescope_open/index_eng.html.
23. ↑ 23.0 23.1 "A perfect blur – First image by exoplanet watcher CHEOPS". ESA Science & Technology. https://sci.esa.int/web/cheops/-/a-perfect-blur-first-image-by-exoplanet-watcher-cheops.
24. ↑ "CHEOPS space telescope takes its first pictures". Unibe. 2020-02-07. https://www.unibe.ch/news/media_news/media_relations_e/media_releases/2020/media_releases_2020/weltraumteleskops_cheops_macht_seine_ersten_bilder/index_eng.html.
25. ↑ "Europe's Cheops telescope begins study of far-off worlds". BBC News. 16 April 2020. https://www.bbc.com/news/science-environment-52307087.
26. ↑ "ESA Science & Technology – Spacecraft". https://sci.esa.int/web/cheops/-/54032-spacecraft.
27. ↑ "ESA Science & Technology – Instrument". https://sci.esa.int/web/cheops/-/54033-instrument.
28. ↑ "Cheops plaques". https://www.esa.int/ESA_Multimedia/Images/2018/08/Cheops_plaques.
29. ↑ Jungo, Janine (2016-03-31). "CHEOPS-Children's Drawings". https://cheops.unibe.ch/campaign-cheops-childrens-drawings/.
30. ↑ Broeg, C.; Fortier, A.; Ehrenreich, D.; Alibert, Y.; Baumjohann, W.; Benz, W.; Deleuil, M.; Gillon, M. et al. (April 2013). "CHEOPS: A transit photometry mission for ESA's small mission programme" (in en). EPJ Web of Conferences 47: 03005. doi:10.1051/epjconf/20134703005. Bibcode: 2013EPJWC..4703005B.
31. ↑ "Cheops observes its first exoplanets and is ready for science" (in en). 2020-04-16. http://www.esa.int/Science_Exploration/Space_Science/Cheops/Cheops_observes_its_first_exoplanets_and_is_ready_for_science.
32. ↑ "The CHEOPS Guaranteed Time Observing Programme – CHEOPS – Cosmos". https://www.cosmos.esa.int/web/cheops/the-cheops-guaranteed-time-observing-programme.
33. ↑ "CHEOPS GTO program: GTO v1.4". 2019-03-19. https://www.cosmos.esa.int/documents/10651/1257879/GTOv1.4+summary.pdf/e9a749c8-659b-dccd-feb1-dbbdc332c69a?t=1553006932364.
34. ↑ "CHEOPS Guest Observers Programme – CHEOPS Guest Observers Programme – Cosmos". https://www.cosmos.esa.int/web/cheops-guest-observers-programme/1.
35. ↑ Labadie-Bartz, Jonathan; Rodriguez, Joseph E.; Stassun, Keivan G.; Ciardi, David R.; Penev, Kaloyan; Johnson, Marshall C.; Gaudi, B. Scott; Colón, Knicole D. et al. (2019-01-21). "KELT-22Ab: A Massive, Short-Period Hot Jupiter Transiting a Near-solar Twin". The Astrophysical Journal Supplement Series 240 (1): 13. doi:10.3847/1538-4365/aaee7e. ISSN 1538-4365. Bibcode: 2019ApJS..240...13L.
36. ↑ Barragán, O.; Gandolfi, D.; Smith, A. M. S.; Deeg, H. J.; Fridlund, M. C. V.; Persson, C. M.; Donati, P.; Endl, M. et al. (2018-04-01). "K2-139 b: a low-mass warm Jupiter on a 29-d orbit transiting an active K0 V star" (in en). Monthly Notices of the Royal Astronomical Society 475 (2): 1765–1776. doi:10.1093/mnras/stx3207. ISSN 0035-8711. Bibcode: 2018MNRAS.475.1765B.
37. ↑ Newton, Elisabeth R.; Mann, Andrew W.; Tofflemire, Benjamin M.; Pearce, Logan; Rizzuto, Aaron C.; Vanderburg, Andrew; Martinez, Raquel A.; Wang, Jason J. et al. (2019-07-23). "TESS Hunt for Young and Maturing Exoplanets (THYME): A Planet in the 45 Myr Tucana–Horologium Association". The Astrophysical Journal 880 (1): L17. doi:10.3847/2041-8213/ab2988. ISSN 2041-8213. Bibcode: 2019ApJ...880L..17N.
38. ↑ "Atmosphere, Not Lava Flows, for Exoplanet 55 Cancri e" (in en-US). 2017-11-27. https://www.skyandtelescope.com/astronomy-news/exoplanet-55-cancri-e-thick-atmosphere/.
39. ↑ Grass, Alexandra (17 December 2019). ""Cheops"-Start wegen Softwareproblems verschoben" (in de). https://www.wienerzeitung.at/nachrichten/wissen/natur/2042807-Cheops-in-den-Startloechern.html.
40. ↑ University of Bern (28 September 2020). "First study with CHEOPS data describes one of the most extreme planets in the universe". EurekAlert!. https://www.eurekalert.org/pub_releases/2020-09/uob-fsw092520.php.
41. ↑ "AO-1 Programmes - CHEOPS Guest Observers Programme - Cosmos". https://www.cosmos.esa.int/web/cheops-guest-observers-programme/ao-1-programmes.
42. ↑ Hoyer, S.; Bonfanti, A.; Leleu, A.; Acuña, L.; Serrano, L. M.; Deleuil, M.; Bekkelien, A.; Broeg, C. et al. (2022-12-01). "Characterization of the HD 108236 system with CHEOPS and TESS Confirmation of a fifth transiting planet". Astronomy and Astrophysics 668: A117. doi:10.1051/0004-6361/202243720. ISSN 0004-6361. Bibcode: 2022A&A...668A.117H. https://ui.adsabs.harvard.edu/abs/2022A&A...668A.117H.
43. ↑ The first result from ESA’s CHEOPS mission Sept 2020
44. ↑ CHEOPS finds unique planetary system Jan 2021
45. ↑ Szabó, Gy. M.; Gandolfi, D.; Brandeker, A.; Csizmadia, Sz.; Garai, Z.; Billot, N.; Broeg, C.; Ehrenreich, D. et al. (2021-10-01). "The changing face of AU Mic b: stellar spots, spin-orbit commensurability, and transit timing variations as seen by CHEOPS and TESS". Astronomy and Astrophysics 654: A159. doi:10.1051/0004-6361/202140345. ISSN 0004-6361. Bibcode: 2021A&A...654A.159S. https://ui.adsabs.harvard.edu/abs/2021A&A...654A.159S.
46. ↑ Lacedelli, G.; Wilson, T. G.; Malavolta, L.; Hooton, M. J.; Collier Cameron, A.; Alibert, Y.; Mortier, A.; Bonfanti, A. et al. (2022-04-01). "Investigating the architecture and internal structure of the TOI-561 system planets with CHEOPS, HARPS-N, and TESS". Monthly Notices of the Royal Astronomical Society 511 (3): 4551–4571. doi:10.1093/mnras/stac199. ISSN 0035-8711. Bibcode: 2022MNRAS.511.4551L. https://ui.adsabs.harvard.edu/abs/2022MNRAS.511.4551L.
47. ↑ Demory, B. -O.; Sulis, S.; Meier Valdés, E.; Delrez, L.; Brandeker, A.; Billot, N.; Fortier, A.; Hoyer, S. et al. (2023-01-01). "55 Cancri e's occultation captured with CHEOPS". Astronomy and Astrophysics 669: A64. doi:10.1051/0004-6361/202244894. ISSN 0004-6361. Bibcode: 2023A&A...669A..64D. https://ui.adsabs.harvard.edu/abs/2023A&A...669A..64D.
48. ↑ Morris, Brett M.; Heng, Kevin; Brandeker, Alexis; Swan, Andrew; Lendl, Monika (2021-07-01). "A CHEOPS white dwarf transit search". Astronomy and Astrophysics 651: L12. doi:10.1051/0004-6361/202140913. ISSN 0004-6361. Bibcode: 2021A&A...651L..12M. https://ui.adsabs.harvard.edu/abs/2021A&A...651L..12M.
49. ↑ Ehrenreich, D.; Delrez, L.; Akinsanmi, B.; Wilson, T. G.; Bonfanti, A.; Beck, M.; Benz, W.; Hoyer, S. et al. (2023-03-01). "A full transit of v2 Lupi d and the search for an exomoon in its Hill sphere with CHEOPS". Astronomy and Astrophysics 671: A154. doi:10.1051/0004-6361/202244790. ISSN 0004-6361. Bibcode: 2023A&A...671A.154E. https://ui.adsabs.harvard.edu/abs/2023A&A...671A.154E.
50. ↑ Serjeant, Stephen; Elvis, Martin; Tinetti, Giovanna (November 2020). "The future of astronomy with small satellites" (in en). Nature Astronomy 4 (11): 1031–1038. doi:10.1038/s41550-020-1201-5. Bibcode: 2020NatAs...4.1031S. https://www.nature.com/articles/s41550-020-1201-5?proof=tr.

## External links

Library resources about
CHEOPS

* * *

* Resources in your library
* Resources in other libraries

* CHEOPS ESA homepage
* CHEOPS homepage includes orbital tracking of the CHEOPS spacecraft
* Europe to begin search for habitable planets in our cosmic backyard, 22 October 2012, Stuart Clark, The Guardian
* CHEOPS mission visualization – video
* Orbital Tracking at uphere.space

* v
* t
* e

Space observatories

Operating|

* AGILE (since 2007)
* AMS-02 (since 2011)
* Aoi (since 2018)
* ASTERIA (since 2017)
* Astrosat (since 2015)
* BRITE constellation (since 2013)
* CALET (since 2015)
* Chandra (AXAF) (since 1999)
* DAMPE (since 2015)
* Fermi (since 2008)
* Gaia (since 2013)
* HXMT (Insight) (since 2017)
* Hinode (Solar-B) (since 2006)
* HiRISE (since 2005)
* Hisaki (SPRINT-A) (since 2013)
* Hubble (since 1990)
* INTEGRAL (since 2002)
* IBEX (since 2008)
* IRIS (since 2013)
* ISS-CREAM (since 2017)
* MAXI (since 2009)
* Mikhailo Lomonosov (since 2016)
* Mini-EUSO (since 2019)
* NCLE (since 2018)
* NEOSSat (since 2013)
* NICER (since 2017)
* NuSTAR (since 2012)
* Odin (since 2001)
* SDO (since 2010)
* SOHO (since 1995)
* SOLAR (since 2008)
* Spektr-RG (since 2019)
* Spitzer (since 2003)
* STEREO (since 2006)
* Swift (since 2004)
* TESS (since 2018)
* WISE (since 2009)
* XMM-Newton (since 1999)

Planned|

* CHEOPS (2019)
* iWF-MAXI (2019)
* Astro-1 Telescope (2020)
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* ORBIS (2020)
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* SPHEREx (2023)
* Small-JASMINE (2024)
* Near-Earth Object Surveillance Mission (2025+)
* Spektr-UV (2025)
* WFIRST (2025+)
* PLATO (2026)
* LiteBIRD (2027)
* ARIEL (2028)
* Spektr-M (2030+)
* ATHENA (2031)
* LISA (2034)

Proposed|

* Arcus
* AstroSat-2
* EXCEDE
* Fresnel Imager
* FOCAL
* HabEx
* Hibari
* Hypertelescope
* JEM-EUSO
* LUVOIR
* ATLAST
* HDST
* Lynx
* Nautilus Deep Space Observatory
* New Worlds Mission
* NRO donation to NASA
* OST
* PhoENiX
* Solar-D
* SPICA
* THEIA
* THESEUS

Retired|

* Akari (Astro-F) (2006–2011)
* ALEXIS (1993–2005)
* Alouette 1 (1962–1972)
* Ariel 1 (1962, 1964)
* Ariel 2 (1964)
* Ariel 3 (1967–1969)
* Ariel 4 (1971–1972)
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* Astro-1 (1990)
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* CHIPSat (2003–2008)
* Compton (CGRO) (1991–2000)
* CoRoT (2006–2013)
* Cos-B (1975–1982)
* COBE (1989–1993)
* DXS (1993)
* EPOCh (2008)
* EPOXI (2010)
* Explorer 11 (1961)
* EXOSAT (1983–1986)
* EUVE (1992–2001)
* FUSE (1999–2007)
* Kvant-1 (1987–2001)
* GALEX (2003–2013)
* Gamma (1990–1992)
* Ginga (Astro-C) (1987–1991)
* Granat (1989–1998)
* Hakucho (CORSA-b) (1979–1985)
* HALCA (MUSES-B) (1997–2005)
* HEAO-1 (1977–1979)
* Herschel (2009–2013)
* Hinotori (Astro-A) (1981–1991)
* HEAO-2 (Einstein Obs.) (1978–1982)
* HEAO-3 (1979–1981)
* HETE-2 (2000–2008)
* Hipparcos (1989–1993)
* IUE (1978–1996)
* IRAS (1983)
* IRTS (1995–1996)
* ISO (1996–1998)
* IXAE (1996–2004)
* Kepler (2009–2018)
* Kristall (1990–2001)
* LEGRI (1997–2002)
* LISA Pathfinder (2015–2017)
* MOST (2003–2019)
* MSX (1996–1997)
* OAO-2 (1968–1973)
* OAO-3 (Copernicus) (1972–1981)
* Orbiting Solar Observatory
* OSO 1
* OSO 2/OSO B
* OSO 3
* OSO 4
* OSO 5
* OSO 6
* OSO 7
* OSO 8
* Orion 1 (1971)
* Orion 2 (1973)
* PAMELA (2006–2016)
* PicSat (2018)
* Planck (2009–2013)
* RELIKT-1 (1983–1984)
* R/HESSI (2002–2018)
* ROSAT (1990–1999)
* RXTE (1995–2012)
* SAMPEX (1992–2004)
* SAS-B (1972–1973)
* SAS-C (1975–1979)
* Solwind (1979–1985)
* Spektr-R (2011–2019)
* Suzaku (Astro-EII) (2005–2015)
* Taiyo (SRATS) (1975–1980)
* Tenma (Astro-B) (1983–1985)
* Uhuru (1970–1973)
* Vanguard 3 (1959)
* WMAP (2001–2010)
* Yokoh (Solar-A) (1991–2001)

Hibernating
(Mission completed)|

* SWAS (1998–2005)
* TRACE (1998–2010)

Lost|

* OAO-1 (1966)
* OAO-B (1970)
* CORSA (1976)
* OSO C (1965)
* ABRIXAS (1999)
* HETE-1 (1996)
* WIRE (1999)
* Astro-E (2000)
* Tsubame (2014–2015)
* Hitomi (Astro-H) (2016)

Cancelled|

* AOSO
* Astro-G
* Constellation-X
* Darwin
* Destiny
* EChO
* Eddington
* FAME
* FINESSE
* GEMS
* HOP
* IXO
* JDEM
* LOFT
* OSO J
* OSO K
* Sentinel
* SIM & SIMlite
* SNAP
* SPOrt
* TAUVEX
* TPF
* XEUS
* XIPE

See also|

* Great Observatories program
* List of space telescopes
* List of proposed space observatories
* List of X-ray space telescopes

* Category

* v
* t
* e

Exoplanet search projects

* Exoplanetology
* Exoplanet

Ground-based|

* AAPS
* APF
* CORALIE
* EAPSNet
* ELODIE
* EPICS
* ESPRESSO
* FINDS Exo-Earths
* Geneva
* HARPS
* HARPS-N
* GPI
* HATNet
* HEK
* HiCIAO
* HIRES
* KELT
* LCES
* Magellan
* MARVELS
* MASCARA
* MEarth
* MicroFUN
* MINERVA
* Australis
* MOA
* N2K
* NGTS
* NESSI
* OGLE
* OPSP
* PlanetPol
* Project 1640
* PARAS
* SEEDS
* SETI
* SOPHIE
* SPECULOOS
* SPHERE
* SuperWASP
* Systemic
* TrES
* XO Telescope
* ZIMPOL/CHEOPS

Space missions|

| Past|

* MOST (2003–2019)
* SWEEPS using HST (2006)
* CoRoT (2006–2013)
* EPOXI using Deep Impact (2008–2013)
* Kepler (2009–2018)
* detected exoplanets

|

Current|

* Gaia (2013–present)
* ASTERIA (2017–present)
* TESS (2018–present)

Planned|

* CHEOPS (2019)
* James Webb Space Telescope (2021)
* PLATO (2026)
* ARIEL (2028)
* WFIRST (mid-2020s)

Proposed|

* ATLAST
* EXCEDE
* HabEx
* HDST
* LUVOIR
* Nautilus Deep Space Observatory
* New Worlds Mission
* OST
* PEGASE

Cancelled|

* Darwin
* EChO
* Eddington
* Space Interferometry Mission
* Terrestrial Planet Finder

* Detection methods
* Discoveries of exoplanets
* Lists of exoplanets
* nearest

* v
* t
* e

European Space Agency

| Spaceports|

* Guiana Space Centre
* Esrange

|

Launch vehicles|

* Ariane 5
* Ariane 6
* Arianespace Soyuz
* Vega

Facilities|

* Space Operations Centre
* Space Research and Technology Centre
* ESA Centre for Earth Observation
* European Astronaut Centre
* Space Astronomy Centre
* Space Applications and Telecommunications Centre
* Concurrent Design Facility
* Space Telescope European Coordinating Facility

Communications|

* ESTRACK
* European Data Relay System

Programmes|

* Aurora
* ATV
* Copernicus
* Sentinel
* Columbus
* CryoSat
* EGNOS
* GALILEO
* ELIPS
* ExoMars
* FLPP
* Living Planet Programme
* Orion
* Space Situational Awareness Programme
* Science Programme
* Horizon 2000
* Cosmic Vision
* Pride

Predecessors|

* European Launcher Development Organisation
* European Space Research Organisation

Related topics|

* Arianespace
* ESA Television
* EUMETSAT
* European Space Camp
* GEWEX
* Planetary Science Archive

Projects and missions

Science|

| Solar physics|

* ISEE-2 (1977–87)
* Ulysses (1990–2009)
* SOHO (1995–present)
* Cluster II (2000–present)
* Solar Orbiter (2020)
* Lagrange (2020s)

|

Planetary science|

* Giotto (1985–92)
* Huygens (1997–2005)
* SMART-1 (2003–06)
* Mars Express (2003–present)
* Rosetta/Philae (2004–16)
* Venus Express (2005–14)
* ExoMars Trace Gas Orbiter (2016–present)
* BepiColombo (2018–present)
* Rosalind Franklin rover (2020)
* Jupiter Icy Moons Explorer (2022)
* Comet Interceptor (2028)

Astronomy and
cosmology

* Cos-B (1975–82)
* IUE (1978–96)
* EXOSAT (1983–86)
* Hipparcos (1989–93)
* Hubble (1990–present)
* Eureca (1992–93)
* ISO (1995–98)
* XMM-Newton (1999–present)
* INTEGRAL (2002–present)
* CoRoT (2006–13)
* Planck (2009–13)
* Herschel (2009–13)
* Gaia (2013–present)
* CHEOPS (2019)
* James Webb (2021)
* Euclid (2022)
* PLATO (2026)
* ARIEL (2028)
* ATHENA (2031)
* LISA (2034)

Earth observation|

* Copernicus (1988–)
* Meteosat First Generation (1977–97)
* ERS-1 (1991–2000)
* ERS-2 (1995–2011)
* Meteosat Second Generation (2002–present)
* Envisat (2002–12)
* Double Star (2003–07)
* MetOp (2006–present)
* GOCE (2009–13)
* SMOS (2009–present)
* CryoSat-2 (2010–present)
* Swarm (2013–present)
* Sentinel-1 / 1A / 1B (2014–present)
* Sentinel-2 / 2A / 2B (2015–present)
* Sentinel-3 / 3A / 3B (2016–present)
* Sentinel-5 Precursor (2017–present)
* ADM-Aeolus (2018–present)
* Biomass (2022)
* EarthCARE (2022)
* MetOp-SG-A (2022)
* FLEX (2023)
* Meteosat Third Generation (Sentinel-4) (2023)
* MetOp-SG-B (2023)
* SMILE (2023)
* FORUM (2026)

ISS spaceflight|

* ISS contribution (1998–present)
* Columbus (2008–present)
* Jules Verne (2008)
* Cupola (2010–present)
* Johannes Kepler (2011)
* Edoardo Amaldi (2012)
* Albert Einstein (2013)
* Georges Lemaître (2014)
* European Robotic Arm (2020)

Telecommunications|

* GEOS 2 (1978)
* Olympus-1 (1989–93)
* Artemis (2001–present)
* GIOVE-A (2005–present)
* GIOVE-B (2008–present)
* HYLAS-1 (2010–present)
* Galileo IOV (2011–present)
* Galileo FOC (2014–present)
* EGNOS
* European Data Relay System (2016–present)

Technology
demonstrators

* ARD (1998)
* PROBA-1 (2001–present)
* YES2 (2007)
* PROBA-2 (2009–present)
* PROBA-V (2013–present)
* IXV (2015)
* LISA Pathfinder (2015–17)
* OPS-SAT (2019)
* PROBA-3 (2021)
* AIDA (2023)

Cancelled and proposed|

* ALTIUS
* Ariane 5 ME
* Columbus Man-Tended Free Flyer
* CSTS
* Darwin Mission
* Don Quijote
* e.Deorbit
* EChO
* Eddington
* EnVision
* EXPERT
* Hermes
* Hopper
* LOFT
* Luna 27
* Lunar Lander
* Marco Polo
* MarcoPolo-R
* Mars sample return mission
* ODINUS
* SPICA
* STE-QUEST
* THESEUS
* THOR
* XIPE

Failed|

* Cluster
* CryoSat-1
* GEOS 1
* Schiaparelli EDM

Future missions in italics

* Category
* Commons
* Wikinews
* WikiProject

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