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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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