Top-level RVS-specific requirements.
|Average number of transits over mission||40 for objects||V < 15|
|Wavelength range||847–874 nm|
|Spectral resolving power (HR mode)||average 10 500–12 500; 90% ≥10 000; max 13 500|
|Spatial resolution||1.8 arcsec to include 90% of flux|
|Maximum stellar density||36 000 objects degree−2|
|Maximum apparent brightness||all spectral types||V < 6|
|Minimum apparent brightness||B1V||V > 13|
|G2V||V > 17|
|K1IIIMP||V > 19|
|Radial velocity systematic error after calibration||≤300 m s−1 at end of mission|
|Radial velocity precision of 1 km s−1||B1V||V ≤7|
|K1III MP||V ≤13.5|
|Radial velocity precision of 15 km s−1||B1V||V ≤12|
|K1III MP||V ≤17|
Notes.Additional requirements include the capability for operation in HR and LR mode (see text), at least Nyquist spectral sampling for HR mode, control over flux rejection levels outside the RVS bandpass, and straylight requirements applicable to the payload as a whole. Spectral types follow the standard terminology, so that temperature decreases from B to K stars, V in the spectral identifier denotes dwarfs, and IIIMP denotes metal poor giants. From Colangelo (2010).
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