Table 1
CHEOPS main characteristics.
| Type of mission | Exoplanet follow-up |
| Telescope | Reflector, 30 cm aperture |
| Launch date | 18.12.2019 |
| Nominal mission | 25.03.2020–24.09.2023 |
| First mission extension | 25.09.2023–31.12.2026 |
| Satellite weight | 275 kg |
| Satellite dimensions | ~1.5 × 1.5 × 1.5 m |
| Telemetry rate | 1.2 Gbit day–1 (S band) |
| Orbit | Sun-synchronous, LTAN 6 am |
| Orbital altitude | 700 km |
| Orbital period | 98.7 min |
| Bandpass | 0.33–1.1 µm |
| Integrated throughput | 25–50% (a) |
| CCD | E2V ΑΙΜΟ CCD47-20 |
| FoV | 0.32° |
| Plate scale | 1 arcsec px–1 |
| PSF | Defocused R90 = 16.5 (b) |
| Nominal magnitude range | G = 6–12 (c) |
| Science images | Circular (d) r = 100 px |
| Image cadence | ≥ 1 image min–1 |
| Image exposure time | 0.001–60 s (e) |
| Sky coverage | 70% (the ecliptic poles are not observable) |
Notes. (a)It depends on the stellar spectral type; see Fig. 3. (b)90% of the encircled energy is contained in this radius.(c)Observations outside the nominal magnitude range are possible; see Sect. 6.1 for details. (d)Since 05.05.2024 window images are square to favour the study of the CTI effect. (e)Set by the user.
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