CHEOPS

Thousands of exoplanets have been discovered by the end of the 2010s;{{cite web|url=https://www.dw.com/en/esa-cheops-mission-exoplanets-in-focus/a-51659828|title=ESA CHEOPS mission: Exoplanets in focus |website=dw.com|access-date=2019-12-16}} 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.{{cite web|url=https://www.newscientist.com/article/2227589-esa-is-about-to-launch-a-space-telescope-to-study-how-planets-are-made/|title=ESA is about to launch a space telescope to study how planets are made|publisher=New Scientist|access-date=2019-12-16}}

For the planned mission duration of 3.5 years, CHEOPS is to measure the size of known transiting exoplanets orbiting bright and nearby stars,{{cite news |title=ESA Science Programme's new small satellite will study super-Earths|url=http://www.esa.int/esaCP/SEMXFG4S18H_index_0.html|access-date=19 October 2012|publisher=ESA|date=19 October 2012}} 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 observatories such as James Webb Space Telescope (JWST) or the extremely large telescopes.{{cite web|url=https://spaceflightnow.com/2019/12/15/esa-satellite-set-for-launch-to-measure-sizes-of-exoplanets/|title=ESA satellite set for launch to measure sizes of exoplanets|publisher= Spaceflight Now|access-date=2019-12-16}}

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

File:CHEOPS_CCD_Detector_photographed_through_flight_optics.jpg

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. 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.[http://sci.esa.int/cheops/54321-cheops-exoplanet-mission-meets-key-milestones-en-route-to-2017-launch/CHEOPS exoplanet mission meets key milestones en route to 2017 launch] ESA 11 July 2014{{cite web|url=https://www.cosmos.esa.int/web/cheops/who-is-who-in-cheops|title=Who is Who in CHEOPS – CHEOPS – Cosmos|website=cosmos.esa.int|access-date=2019-12-30}} The ESA mission cost is capped at €50 million. Media Lario S.r.l. (Italy) was responsible for the optical finishing of the primary optical element.{{cite web |url=https://www.asi.it/esplorazione/sistema-solare/cheops/|title=Cheops|website=ASI|language=it-IT|access-date=2019-12-18}}

CHEOPS launched on board of a Soyuz-STA launch vehicle on 18 December 2019, at 08:54:20 UTC from Centre Spatial Guyanais (CSG) in Kourou, French Guiana.{{cite web|url=https://www.arianespace.com/mission-update/flight-vs23-soyuz-lifts-off-from-the-spaceport-in-french-guiana/|title=Flight VS23: Soyuz lifts off from the Spaceport in French Guiana|publisher=Arianespace|access-date=2019-12-18}}{{cite web|url=https://www.arianespace.com/mission-update/flight-vs23-launch-rescheduled-to-december-18/|title=Flight VS23: Launch rescheduled to December 18|publisher=Arianespace|access-date=2019-12-17}} CHEOPS separated after two hours and 23 minutes from lift-off.{{Cite web|url=https://www.airbus.com/newsroom/press-releases/en/2019/12/airbusbuilt-cheops-satellite-successfully-launched-on-soyuz.html|title = Airbus-built CHEOPS satellite successfully launched on Soyuz {{pipe}} Airbus}} 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. CHEOPS went into a {{cvt|712|km}} altitude Sun-synchronous polar orbit.

After the cover of the telescope was opened on 29 January 2020,{{cite web |url=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|title=Cover of CHEOPS Space Telescope Open|date=2020-01-29 |publisher=Unibe|access-date=2020-01-30}} 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.{{cite web|url=https://sci.esa.int/web/cheops/-/a-perfect-blur-first-image-by-exoplanet-watcher-cheops |title=A perfect blur – First image by exoplanet watcher CHEOPS|publisher=ESA Science & Technology}} 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.{{cite web |url=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|title=CHEOPS space telescope takes its first pictures|date=2020-02-07|publisher=Unibe|access-date=2020-02-09}}

In April 2020, the telescope began science operations.{{Cite news|url=https://www.bbc.com/news/science-environment-52307087|title = Europe's Cheops telescope begins study of far-off worlds|work = BBC News|date = 16 April 2020}}

File:Unibe CHEOPS 020 20200616 1200.jpg

The satellite has dimensions of approximately {{cvt|1.5|xx|1.5|xx|1.5|m}} and a hexagonal base structure. The satellite bus of the CHEOPS spacecraft is based on the SEOSAT platform.{{cite web|url=https://cheops.unibe.ch/cheops-mission/spacecraft/|title=Spacecraft|last=Stettler|first=Ulrich|website=CHEOPS|access-date=2019-12-16|archive-url=https://web.archive.org/web/20190813115625/https://cheops.unibe.ch/cheops-mission/spacecraft/|archive-date=2019-08-13|url-status=dead}}

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.

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.{{cite web |url=https://sci.esa.int/web/cheops/-/54032-spacecraft|title=ESA Science & Technology – Spacecraft|website=sci.esa.int|access-date=2019-12-16}}

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 {{cvt|233|K|C}}, with a thermal stability of 10 mK. The telescope is a single medium-size f/8, on-axis Ritchey-Chrétien telescope with a {{cvt|32|cm}} aperture, mounted on a stiff optical bench.{{cite web|url=https://sci.esa.int/web/cheops/-/54033-instrument|title=ESA Science & Technology – Instrument |website=sci.esa.int|access-date=2019-12-16}} The University of Geneva and the University of Bern provided the powerful photometer.[https://www.bbc.com/news/science-environment-50804258 Europe's Cheops telescope launches to study far-off worlds. Jonathan Amos, BBC News 18 December 2019] Target star images are deliberately defocussed to help accurate photometry.

Two titanium plaques with thousands of miniaturised drawings by children have been fixed to CHEOPS. Each plaque measures nearly {{cvt|18|xx|24|cm}}. 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.{{cite web|url=https://www.esa.int/ESA_Multimedia/Images/2018/08/Cheops_plaques|title=Cheops plaques |website=esa.int|access-date=2019-12-16}} The individual drawings can be found at the website of CHEOPS by clicking on a map of Europe.{{cite web|url=https://cheops.unibe.ch/campaign-cheops-childrens-drawings/|title=CHEOPS-Children's Drawings|last=Jungo|first=Janine|date=2016-03-31|website=CHEOPS|access-date=2019-12-18}}

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).

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 {{solar radius|0.9|link=yes}} in 60 days detected with a S/N_transit >10 (100 ppm transit depth). For example, an Earth-size transit across a G star creates an 80 ppm depth{{explain|date=April 2024}}.

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.{{Cite journal|last1=Broeg|first1=C.|last2=Fortier|first2=A.|last3=Ehrenreich|first3=D.|last4=Alibert|first4=Y. |last5=Baumjohann|first5=W.|last6=Benz|first6=W.|last7=Deleuil|first7=M.|last8=Gillon|first8=M.|last9=Ivanov|first9=A.|last10=Liseau|first10=R.|last11=Meyer|first11=M.|last12=Oloffson|first12=G.|last13=Pagano|first13=I.|last14=Piotto|first14=G.|last15=Pollacco|first15=D.|last16=Queloz|first16=D.|last17=Ragazzoni|first17=R.|last18=Renotte|first18=E.|last19=Steller|first19=M.|last20=Thomas|first20=N.|date=April 2013|title=CHEOPS: A transit photometry mission for ESA's small mission programme|journal= EPJ Web of Conferences|language=en|volume=47|pages=03005|doi=10.1051/epjconf/20134703005|bibcode=2013EPJWC..4703005B|arxiv=1305.2270|s2cid=44199674}}

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. Data-taking started in early 2020.{{Cite news|url=http://www.esa.int/Science_Exploration/Space_Science/Cheops/Cheops_observes_its_first_exoplanets_and_is_ready_for_science|title=Cheops observes its first exoplanets and is ready for science |date=2020-04-16|website=www.esa.int|language=en|access-date=2020-04-29}}

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).{{Cite web|url=https://www.cosmos.esa.int/web/cheops/the-cheops-guaranteed-time-observing-programme|title=The CHEOPS Guaranteed Time Observing Programme – CHEOPS – Cosmos |website=www.cosmos.esa.int|access-date=2019-11-15}} 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.{{Cite web |url=https://www.cosmos.esa.int/documents/10651/1257879/GTOv1.4+summary.pdf/e9a749c8-659b-dccd-feb1-dbbdc332c69a?t=1553006932364|title=CHEOPS GTO program: GTO v1.4|date=2019-03-19}}

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.{{Cite web|url=https://www.cosmos.esa.int/web/cheops-guest-observers-programme/1|title=CHEOPS Guest Observers Programme – CHEOPS Guest Observers Programme – Cosmos|website=www.cosmos.esa.int|access-date=2019-11-15}} The approved AO-1 projects include observations of the hot jupiters HD 17156 b, Kelt-22A b,{{Cite journal|last1=Labadie-Bartz|first1=Jonathan|last2=Rodriguez|first2=Joseph E.|last3=Stassun|first3=Keivan G.|last4=Ciardi|first4=David R.|last5=Penev|first5=Kaloyan |last6=Johnson|first6=Marshall C.|last7=Gaudi|first7=B. Scott|last8=Colón|first8=Knicole D.|last9=Bieryla|first9=Allyson|last10=Latham|first10=David W.|last11=Pepper|first11=Joshua|date=2019-01-21|title=KELT-22Ab: A Massive, Short-Period Hot Jupiter Transiting a Near-solar Twin|journal=The Astrophysical Journal Supplement Series|volume=240|issue=1|pages=13|arxiv=1803.07559|doi=10.3847/1538-4365/aaee7e|issn=1538-4365|bibcode=2019ApJS..240...13L|s2cid=54810218 |doi-access=free }} warm jupiter K2-139b,{{Cite journal|last1=Barragán|first1=O.|last2=Gandolfi|first2=D.|last3=Smith|first3=A. M. S.|last4=Deeg|first4=H. J. |last5=Fridlund|first5=M. C. V.|last6=Persson|first6=C. M.|last7=Donati|first7=P.|last8=Endl|first8=M.|last9=Csizmadia|first9=Sz|last10=Grziwa|first10=S.|last11=Nespral|first11=D.|date=2018-04-01|title=K2-139 b: a low-mass warm Jupiter on a 29-d orbit transiting an active K0 V star|journal=Monthly Notices of the Royal Astronomical Society|language=en|volume=475|issue=2|pages=1765–1776 |arxiv=1702.00691|doi=10.1093/mnras/stx3207|doi-access=free |issn=0035-8711|hdl=10486/684205|bibcode=2018MNRAS.475.1765B|s2cid=119077300}} multi systems GJ 9827, K2-138, the exoplanet DS Tuc Ab,{{Cite journal|last1=Newton|first1=Elisabeth R.|last2=Mann|first2=Andrew W.|last3=Tofflemire|first3=Benjamin M.|last4=Pearce|first4=Logan |last5=Rizzuto |first5=Aaron C.|last6=Vanderburg|first6=Andrew|last7=Martinez|first7=Raquel A.|last8=Wang|first8=Jason J.|last9=Ruffio|first9=Jean-Baptiste|last10=Kraus|first10=Adam L.|last11=Johnson|first11=Marshall C.|date=2019-07-23|title=TESS Hunt for Young and Maturing Exoplanets (THYME): A Planet in the 45 Myr Tucana–Horologium Association|journal=The Astrophysical Journal|volume=880|issue=1|pages=L17 |arxiv=1906.10703|doi=10.3847/2041-8213/ab2988|issn=2041-8213|bibcode=2019ApJ...880L..17N|s2cid=195658207 |doi-access=free }} 55 Cancri e (likely GTO),{{Cite web|url=https://www.skyandtelescope.com/astronomy-news/exoplanet-55-cancri-e-thick-atmosphere/|title=Atmosphere, Not Lava Flows, for Exoplanet 55 Cancri e|date=2017-11-27|website=Sky & Telescope|language=en-US|access-date=2019-12-18}}{{Cite web |url=https://www.wienerzeitung.at/nachrichten/wissen/natur/2042807-Cheops-in-den-Startloechern.html|title="Cheops"-Start wegen Softwareproblems verschoben|last=Grass|first=Alexandra|website=Natur - Wiener Zeitung Online|date=17 December 2019 |language=de|access-date=2019-12-18}} WASP-189 b{{cite news |author=University of Bern |author-link=University of Bern |title=First study with CHEOPS data describes one of the most extreme planets in the universe |url=https://www.eurekalert.org/pub_releases/2020-09/uob-fsw092520.php |date=28 September 2020 |work=EurekAlert! |access-date=28 September 2020 }} 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.{{Cite web|url=https://www.cosmos.esa.int/web/cheops-guest-observers-programme/ao-1-programmes|title=AO-1 Programmes - CHEOPS Guest Observers Programme - Cosmos|website=www.cosmos.esa.int|access-date=2019-11-15}}

HD 108236 f was discovered with CHEOPS.{{Cite journal |last1=Hoyer |first1=S. |last2=Bonfanti |first2=A. |last3=Leleu |first3=A. |last4=Acuña |first4=L. |last5=Serrano |first5=L. M. |last6=Deleuil |first6=M. |last7=Bekkelien |first7=A. |last8=Broeg |first8=C. |last9=Florén |first9=H. -G. |last10=Queloz |first10=D. |last11=Wilson |first11=T. G. |last12=Sousa |first12=S. G. |last13=Hooton |first13=M. J. |last14=Adibekyan |first14=V. |last15=Alibert |first15=Y. |date=2022-12-01 |title=Characterization of the HD 108236 system with CHEOPS and TESS Confirmation of a fifth transiting planet |url=https://ui.adsabs.harvard.edu/abs/2022A&A...668A.117H |journal=Astronomy and Astrophysics |volume=668 |pages=A117 |doi=10.1051/0004-6361/202243720 |arxiv=2210.08912 |bibcode=2022A&A...668A.117H |s2cid=252832042 |issn=0004-6361}}

A study of WASP-189b (a 'hot Jupiter') has been published.[https://www.innovationnewsnetwork.com/the-first-result-from-esas-cheops-mission/7222/ The first result from ESA's CHEOPS mission Sept 2020]

TOI-178 has been found to have 6 planets, 5 having orbital resonances.[https://www.sciencedaily.com/releases/2021/01/210125144528.htm CHEOPS finds unique planetary system Jan 2021] 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.{{Cite journal |last1=Szabó |first1=Gy. M. |last2=Gandolfi |first2=D. |last3=Brandeker |first3=A. |last4=Csizmadia |first4=Sz. |last5=Garai |first5=Z. |last6=Billot |first6=N. |last7=Broeg |first7=C. |last8=Ehrenreich |first8=D. |last9=Fortier |first9=A. |last10=Fossati |first10=L. |last11=Hoyer |first11=S. |last12=Kiss |first12=L. |last13=Lecavelier des Etangs |first13=A. |last14=Maxted |first14=P. F. L. |last15=Ribas |first15=I. |date=2021-10-01 |title=The changing face of AU Mic b: stellar spots, spin-orbit commensurability, and transit timing variations as seen by CHEOPS and TESS |url=https://ui.adsabs.harvard.edu/abs/2021A&A...654A.159S |journal=Astronomy and Astrophysics |volume=654 |pages=A159 |doi=10.1051/0004-6361/202140345 |arxiv=2108.02149 |bibcode=2021A&A...654A.159S |s2cid=236912985 |issn=0004-6361}}

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.{{Cite journal |last1=Lacedelli |first1=G. |last2=Wilson |first2=T. G. |last3=Malavolta |first3=L. |last4=Hooton |first4=M. J. |last5=Collier Cameron |first5=A. |last6=Alibert |first6=Y. |last7=Mortier |first7=A. |last8=Bonfanti |first8=A. |last9=Haywood |first9=R. D. |last10=Hoyer |first10=S. |last11=Piotto |first11=G. |last12=Bekkelien |first12=A. |last13=Vanderburg |first13=A. M. |last14=Benz |first14=W. |last15=Dumusque |first15=X. |date=2022-04-01 |title=Investigating the architecture and internal structure of the TOI-561 system planets with CHEOPS, HARPS-N, and TESS |journal=Monthly Notices of the Royal Astronomical Society |volume=511 |issue=3 |pages=4551–4571 |doi=10.1093/mnras/stac199 |doi-access=free |arxiv=2201.07727 |bibcode=2022MNRAS.511.4551L |issn=0035-8711}}

CHEOPS observed occultations caused by the planet 55 Cancri e and was able to observe individual occultations for the first time.{{Cite journal |last1=Demory |first1=B. -O. |last2=Sulis |first2=S. |last3=Meier Valdés |first3=E. |last4=Delrez |first4=L. |last5=Brandeker |first5=A. |last6=Billot |first6=N. |last7=Fortier |first7=A. |last8=Hoyer |first8=S. |last9=Sousa |first9=S. G. |last10=Heng |first10=K. |last11=Lendl |first11=M. |last12=Krenn |first12=A. |last13=Morris |first13=B. M. |last14=Patel |first14=J. A. |last15=Alibert |first15=Y. |date=2023-01-01 |title=55 Cancri e's occultation captured with CHEOPS |url=https://ui.adsabs.harvard.edu/abs/2023A&A...669A..64D |journal=Astronomy and Astrophysics |volume=669 |pages=A64 |doi=10.1051/0004-6361/202244894 |arxiv=2211.03582 |bibcode=2023A&A...669A..64D |s2cid=253384008 |issn=0004-6361}}

A study searching for transits around 6 white dwarfs did not detect any transits{{Cite journal |last1=Morris |first1=Brett M. |last2=Heng |first2=Kevin |last3=Brandeker |first3=Alexis |last4=Swan |first4=Andrew |last5=Lendl |first5=Monika |date=2021-07-01 |title=A CHEOPS white dwarf transit search |url=https://ui.adsabs.harvard.edu/abs/2021A&A...651L..12M |journal=Astronomy and Astrophysics |volume=651 |pages=L12 |doi=10.1051/0004-6361/202140913 |arxiv=2105.07987 |bibcode=2021A&A...651L..12M |s2cid=234742060 |issn=0004-6361}} 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.{{Cite journal |last1=Ehrenreich |first1=D. |last2=Delrez |first2=L. |last3=Akinsanmi |first3=B. |last4=Wilson |first4=T. G. |last5=Bonfanti |first5=A. |last6=Beck |first6=M. |last7=Benz |first7=W. |last8=Hoyer |first8=S. |last9=Queloz |first9=D. |last10=Alibert |first10=Y. |last11=Charnoz |first11=S. |last12=Collier Cameron |first12=A. |last13=Deline |first13=A. |last14=Hooton |first14=M. |last15=Lendl |first15=M. |date=2023-03-01 |title=A full transit of v2 Lupi d and the search for an exomoon in its Hill sphere with CHEOPS |url=https://ui.adsabs.harvard.edu/abs/2023A&A...671A.154E |journal=Astronomy and Astrophysics |volume=671 |pages=A154 |doi=10.1051/0004-6361/202244790 |arxiv=2302.01853 |bibcode=2023A&A...671A.154E |s2cid=256598325 |issn=0004-6361}}

CHEOPS also sees trails from other satellites during its observations, since it is in low Earth orbit.{{cite journal |last1=Serjeant |first1=Stephen |last2=Elvis |first2=Martin |last3=Tinetti |first3=Giovanna |title=The future of astronomy with small satellites |url=https://www.nature.com/articles/s41550-020-1201-5?proof=tr |journal=Nature Astronomy |date=November 2020 |volume=4 |issue=11 |pages=1031–1038 |language=en |doi=10.1038/s41550-020-1201-5|arxiv=2011.03478 |bibcode=2020NatAs...4.1031S |s2cid=226278269 }}

• List of exoplanet search projects
• {{annotated link|CoRoT}}
• {{annotated link|Kepler space telescope}}
• {{annotated link|MOST (satellite)|MOST}}
• {{annotated link|PLATO (spacecraft)|PLATO}}
• {{annotated link|Transiting Exoplanet Survey Satellite |Transiting Exoplanet Survey Satellite (TESS)}}
• {{annotated link|List of space telescopes}}

{{Reflist}}

{{Library resources box}}

• [http://sci.esa.int/cheops CHEOPS ESA homepage]
• [http://cheops.unibe.ch/ CHEOPS homepage] includes orbital tracking of the CHEOPS spacecraft
• [https://www.theguardian.com/science/across-the-universe/2012/oct/22/europe-search-habitable-planets-esa-cheops Europe to begin search for habitable planets in our cosmic backyard], 22 October 2012, Stuart Clark, The Guardian
• [https://www.youtube.com/watch?v=nQPhdCFiuDs CHEOPS mission visualization – video]
• [https://uphere.space/satellites/44874 Orbital Tracking] at [https://uphere.space uphere.space]

{{Space observatories}}

{{Exoplanet search projects}}

{{European Space Agency}}

{{Orbital launches in 2019}}

{{Use British English|date=August 2015}}

Category:European Space Agency space probes

Category:Science and technology in Switzerland

Category:Space telescopes

Category:Spacecraft launched in 2019

Category:Exoplanet search projects

Category:Cosmic Vision