List of astronomical interferometers at visible and infrared wavelengths Current performance of ground-based interferometers Current Performance of Existing Astronomical Interferometers

| Interferometer_and_observing_mode | Waveband | Limiting_magnitude | Minimum_baseline_m_un_projected | Maximum_baseline_m | Approx_no_visibility_measurements_per_year_measurements_per_night_x_nights_used_per_year | Max_ratio_of_no_phase_no_amplitude_measurements_measure_of_imaging_performance_0_is_none | Accuracy_of_amplitude2_measurements | Accuracy_of_phase_measurements_milli_radians | Number_of_spectral_channels_max_in_use_simultaneously | Comments_ |
|---|---|---|---|---|---|---|---|---|---|---|
| ISI | N | 0 | 10 | 50 | 5000 | 0.3 | 1% | 1 | 1000 | Maximum baseline 70-m |
| Keck Interferometer | H, K, L, N | 10.3 | 85 | 85 | 1000 | 0 | 4% | 1 | 330 | Nulling Key Science Underway - No imaging on a single baseline instrument; maximum baseline 11-m. CLOSED. |
| Keck Aperture Masking | J, H, K, L | 2 | 0.5 | 9 | 20000 | 0.9 | 20% | 10 | 1 | CLOSED. |
| MIRA 1.2 | R, I | 3 | 30 | 30 | 500 | 0 | 10% | - | 1 | Mid-Infrared |
| Navy Precision Optical Interferometer(NPOI) visible | V, R, I | 5 | 5 | 300 | 50000 | 0.7 | 4% | 10 | 16 | at NOFS; siderstats operational 4 x 1.8m added apertures in FY13. World`s largest optical baseline-437m, 6-phased |