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Table 1

Simulation parameters, representative for the Galactic-center observation of GRAVITY.

Observation & hardware
star magnitude K 10
central wavelength λ 2.22 μm
telescope diameter D 8.2 m
baseline B 80 m
sampling frequency f 300 Hz
tracking run 100 s
# spectral channels 5
fringe-sensing algorithm phase delay

Disturbances & noise
rms piston turbulence 10 μm
wind speed v 15 m s-1
# vibrations per baseline 8–10
rms piston vibration 200–240 nm
max. coh. throughput 0.007
rms tip-tilt deviation 14.6 mas
RON 6 e

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