R. Alonso, 11th CoRoT Week, La Laguna, 22 Mars The. CHEOPS Mission
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1 R. Alonso, 11th CoRoT Week, La Laguna, 22 Mars 2013 The CHEOPS Mission ESA s ESA s first first small small mission mission
2 ESA small missions requirements Science top rated science in any area of space science Cost total cost < 150 M cost to ESA: not to exceed 50 M Schedule developed and launched within 4 years call issued March 3, 2012 proposal due June 15, 2012 mission selection October 19, 2012 mission adoption Nov 2013/ Feb 2014 launch 2017
3 Country Institutes Contacts CH University of Bern (project lead) University of Geneva Swiss Space Center (EPFL) ETH-Z Willy Benz, Nicolas Thomas Didier Queloz Anton Ivanov Michael Meyer Austria Institut für Weltraumforschung, Graz Wolfgang Baumjohann Belgium Centre Spatial de Liège Université de Liège Etienne Renotte Michaël Gillon France Laboratoire dʼastrophysique de Marseille Magali Deleuil Germany DLR Institute for Planetary Research Tilman Spohn Hungary Konkoly Observatory Laszlo Kiss Italy Osservatorio Astrofisico di Catania INAF Osservatorio Astronomico di Padova - INAF Università di Padova Isabella Pagano Roberto Ragazzoni Giampaolo Piotto Portugal Centro de Astrofisica da Universidade do Porto Nuno C. Santos Sweden Onsala Space Observatory, Chalmers University University of Stockholm R. Liseau G. Olofsson UK University of Warwick Don Pollaco
4 apparent magnitude of star Targets: Bright stars Kepler planet candidates Radius planet (REarth) 10.0
5 apparent magnitude of star Targets: Bright stars Kepler planet candidates mass measured by radial velocities Radius planet (REarth) 10.0
6 apparent magnitude of star Targets: Bright stars Kepler planet candidates NGTS 8.0 mass measured by radial velocities Radius planet (REarth) 10.0
7 apparent magnitude of star Targets: Bright stars Kepler planet candidates NGTS CHEOPS mass measured by radial velocities Radius planet (REarth) 10.0
8 Science objectives Mass-radius relation for planets below the mass of Saturn Constraints on planet migration paths Identification of planets w/ atmospheres in the 1 10 MEarth regime Energy transport in hot Jupiter atmospheres New targets for future characterization facilities with spectroscopic capabilities
9 Science objectives Mass-radius relation for planets below the mass of Saturn
10 Science objectives Constraints on planet migration paths gas fraction different histories R M
11 Science objectives Energy transport in hot Jupiter atmospheres Optical phase curve of a V=10.5 mag star by Kepler Borucki et al. (2007)
12 Science objectives New targets for future characterization facilities with spectroscopic capabilities Future characterization of Earths/Superearths detected in transit with CHEOPS
13 High-level Sci Reqs. Photometric accuracy
14 High-level Sci Reqs. Photometric accuracy
15 High-level Sci Reqs. Sky coverage
16 Platform Attitude Control 3-axis stabilized S/C - one side facing Earth pointing accuracy < 8 arc sec rms for 10h Instrument Power 50 W continuous power, 70 W peak Data rate 1 Gbit/day downlink Total mass with payload 200 kg
17 Payload F/8 ~30 cm effective diameter on-axis telescope payload mass: 60 kg radiators outer baffle structure (carbon fiber) baffle tower focal plane assembly beam shaper secondary mirror primary mirror
18 CHEOPS Payload FBD CIS System AIT Optical Sub- System Front Door & Mechanism Baffle Telescope Mechanical Structure & Bench FPA Radiator Back End Optics FPA CCD Readout Elec. Radiator Readout Electr. Electrical Sub-System Digital Processing Unit Thermal Control Module Power Supply Preliminary Functional Block Diagram Issue:2 Revision:19 20 March 2013 Colour Code Yellow UBE Green HUN Dark Blue - CSL Light Blue IWF Purple - INAF Magenta - ESA Cyan - DLR Arrows Violet Thermal straps Dark red Optical path Light blue Electrical 28V Spacecraft
19 Optical Design F/5.13 Ritchey-Chretien Telescope (0.2 central obstruction) + collimator-camera re-imaging system primary mirror Intermediate pupil secondary mirror 312 mm folding mirror focal plane EPD 312 mm efl 2676 mm F/# 8.6 Plate scale 1 arcsec/pixel 400 mm Polychromatic defocused PSF with 30 pixel diameter collimator camera
20 Optical design and stray light performance 1.E-06 Point Source Transmission CHEOPS Baffle version Function for 3 designs Baffle Layout Baffle designed for 35 degree exclusion angle PST 1.E-07 1.E-08 1.E-09 1.E-10 1.E-11 1.E-12 PST V1 PST V2 PST V3 1.E-13 1.E-14 1.E θ /
21 e2v CCD47-20 Detector Characteristic Effective wavelength range Size Operating temperature range Value nm 1024x1024 px C Temperature stability requirement < 10 mk Angular scale approx. 1.2 /px Full well capacity 80,000 e- Read Noise 4 e/px Dark Current negligible Readout frequency 5 MHz Pixel size 13 um Manufacturer e2v
22 Mission summary Name Primary science goal Targets Wavelength Telescope Orbit Lifetime Type CHEOPS (CHaracterizing ExOPlanet Satellite) Measure the radius of planets transiting bright stars to 10% accuracy Known exoplanet host stars with a V-magnitude < 12.5 anywhere on the sky Visible range : 400 to 1100 nm 707 cm 2 effective aperture reflective on-axis telescope LEO sun-synchronous, LTAN 6am, km 3.5 years s-class
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