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The CHEOPS mission
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The CHaracterising ExOPlanet Satellite (CHEOPS) was selected in 2012, as the first small mission in the ESA Science Programme and successfully launched in December 2019. CHEOPS is a partnership between ESA and Switzerland with important contributions by ten additional ESA Member States. CHEOPS is the first mission dedicated to search for transits of exoplanets using ultrahigh precision photometry on bright stars already known to host planets. As a follow-up mission, CHEOPS is mainly dedicated to improving, whenever possible, existing radii measurements or provide first accurate measurements for a subset of those planets for which the mass has already been estimated from ground-based spectroscopic surveys and to following phase curves. CHEOPS will provide prime targets for future spectroscopic atmospheric characterisation. Requirements on the photometric precision and stability have been derived for stars with magnitudes ranging from 6 to 12 in the V band. In particular, CHEOPS shall be able to detect Earth-size planets transiting G5 dwarf stars in the magnitude range between 6 and 9 by achieving a photometric precision of 20 ppm in 6 hours of integration. For K stars in the magnitude range between 9 and 12, CHEOPS shall be able to detect transiting Neptune-size planets achieving a photometric precision of 85 ppm in 3 hours of integration. This is achieved by using a single, frame-transfer, back-illuminated CCD detector at the focal plane assembly of a 33.5 cm diameter telescope. The 280 kg spacecraft has a pointing accuracy of about 1 arcsec rms and orbits on a sun-synchronous dusk-dawn orbit at 700 km altitude. The nominal mission lifetime is 3.5 years. During this period, 20% of the observing time is available to the community through a yearly call and a discretionary time programme managed by ESA.
Forward citations
Cited by 5 Pith papers
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Volcanic Satellites and Ion Escape in the Magnetospheres of Ultra-Cool and Brown Dwarf Stars
Plasma feeding the radio magnetosphere of LSR J1835+3259 could be sourced by a weak stellar ionospheric outflow or, more plausibly, by a tidally heated Io-like volcanic satellite orbiting within ~10 stellar radii.
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HD 148797: A bright F-type star with two moderate-period low-density sub-Jovian planets. Compact multi-planet architectures are common in the Neptunian savanna
HD 148797 hosts two ~40 ME, ~8.3 RE, low-density savanna planets near a 1.619 period ratio whose anti-correlated TTVs yield masses and support compact multi-planet architectures as typical in the savanna.
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The Longest-period Young Transiting Exoplanets. A Duo of Puffy Giants inside a Debris Disk
HD 114082 hosts two puffy, moderate-to-low-mass giants on nearly circular, coplanar, near-resonant orbits of 225.55 and ~314 days, the longest-period young transiting exoplanets known.
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Characterizing the oxidation state of rocky exoplanets with the Large Interferometer for Exoplanets (LIFE)
LIFE baseline mid-IR observations of Earth-sized planets at 10 pc can retrieve CO2, CH4, and NH3 well enough to distinguish mantle redox states from IW-6 to IW+6 under the paper's modeling assumptions.
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SCoRE: the Surface Composition of Rocky Exoplanets
In over 150,000 equilibrium crust-atmosphere models, the thermal stability of 23 minerals is tied to atmospheric type, independent of the six tested refractory-element abundance sets.
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