what is the number of interferometers that use wavebands r?
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col : interferometer and observing mode | waveband | limiting magnitude | minimum baseline (m)\n(un-projected) | maximum baseline (m) | approx. no. visibility measurements per year\n(measurements per night x nights used per year) | max ratio of no. phase / no. amplitude measurements\n(measure of imaging performance, 0 = none) | accuracy of amplitude2 measurements | accuracy of phase measurements\n(milli-radians) | number of spectral channels\n(max in use simultaneously) | comments row 1 : chara array | v, r, i, j, h, k | 8 | 34 | 330 | 7500 | 0.7 | 1% | 10 | 30000 | yes... 30000 in the visible band; maxiumum baseline 330 row 2 : coast visible | r, i | 7 | 4 | 60 | 2000 | 0.5 | 4% | 10 | 4? | 300 cloudy nights per year, maximum baseline 100-m row 3 : coast infrared | j, h | 3 | 4 | 60 | 100 | 0.5 | 20% | 10 | 1 | 300 cloudy nights per year, maximum baseline 100-m row 4 : gi2t visible | r, i | 5 | 10 | 65 | 2000 | 0 | 10% | - | 400? | closed in 2006 row 5 : iota | j, h, k | 7 | 6 | 30 | 10000 | 0.3 | 2% | 10 | 1? | integrated optics beam combiner. closed. row 6 : isi | n | 0 | 10 | 50 | 5000 | 0.3 | 1% | 1 | 1000 | maximum baseline 70-m row 7 : 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 row 8 : keck aperture masking | j, h, k, l | 2 | 0.5 | 9 | 20000 | 0.9 | 20% | 10 | 1 | closed. row 9 : mira 1.2 | r, i | 3 | 30 | 30 | 500 | 0 | 10% | - | 1 | mid-infrared row 10 : 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 row 11 : palomar testbed interferometer | j,h,k | 7 | 86 | 110 | 50000 | 0 | 2% | 0.1 | 5,10 | "dual-star" capable , no imaging on a single row 12 : susi | b, v, r, i | 5 | 5 | 640 | 5000 | 0 | 4% | 10 | 21 | no imaging on a single baseline instrument; maximum baseline 160m row 13 : vlti\n+uts amber | j, h, k simultaneously | 7 | 46 | 130 | 400 | 0.3 | 1% | 10 | 2000 | used for a few weeks per year. longest overall vlti row 14 : vlti\n+ats amber | j, h, k simultaneously | 4 | 46 | 130 | 400 | 0.3 | 1% | 10 | 2000 | longest overall vlti baseline 130m row 15 : vlti\n+uts vinci | k | 11 | 46 | 130 | 400 | 0 | >1% | - | 1 | integrated optics beam combiner. longest overall vlti base row 16 : vlti\n+ats vinci | k | never checked | 12 | 200 | 400 | 0 | >1% | - | 1 | longest overall vlti baseline 130m row 17 : vlti\n+uts midi | n | 4.5 | 46 | 130 | 200 | 0 | 10% | - | 250 | used for a few weeks per year. longest overall vlti row 18 : vlti\n+ats midi | n | 4.5 | ? | 200 | 200 | 0 | 10% | - | 250 | vlti inldes world's largest unfilled apertures (
what is the number of interferometers that use wavebands r?
Interferometer and observing mode Waveband Limiting magnitude Minimum baseline (m)\n(un-projected) Maximum baseline (m) Approx. no. visibility measurements per year\n(measurements per night x nights used per year) Max ratio of no. phase / no. amplitude measurements\n(measure of imaging performance, 0 = none) Accuracy of amplitude2 measurements Accuracy of phase measurements\n(milli-radians) Number of spectral channels\n(max in use simultaneously) Comments
CHARA Array V, R, I, J, H, K 8 34 330 7500 0.7 1% 10 30000 Yes... 30000 in the visible band; maxiumum baseline 330-m
COAST visible R, I 7 4 60 2000 0.5 4% 10 4? 300 cloudy nights per year, maximum baseline 100-m
COAST infrared J, H 3 4 60 100 0.5 20% 10 1 300 cloudy nights per year, maximum baseline 100-m
GI2T visible R, I 5 10 65 2000 0 10% - 400? CLOSED in 2006
IOTA J, H, K 7 6 30 10000 0.3 2% 10 1? Integrated optics beam combiner. CLOSED.
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
Palomar Testbed Interferometer J,H,K 7 86 110 50000 0 2% 0.1 5,10 "dual-star" capable , No imaging on a single baseline instrument. CLOSED 2009.
SUSI B, V, R, I 5 5 640 5000 0 4% 10 21 No imaging on a single baseline instrument; Maximum baseline 160m
VLTI\n+UTs AMBER J, H, K simultaneously 7 46 130 400 0.3 1% 10 2000 Used for a few weeks per year. Longest overall VLTI Baseline 130m
VLTI\n+ATs AMBER J, H, K simultaneously 4 46 130 400 0.3 1% 10 2000 Longest overall VLTI Baseline 130m
VLTI\n+UTs VINCI K 11 46 130 400 0 >1% - 1 Integrated optics beam combiner. Longest overall VLTI Baseline 130m
VLTI\n+ATs VINCI K Never checked 12 200 400 0 >1% - 1 Longest overall VLTI Baseline 130m
VLTI\n+UTs MIDI N 4.5 46 130 200 0 10% - 250 Used for a few weeks per year. Longest overall VLTI Baseline 130m
VLTI\n+ATs MIDI N 4.5 ? 200 200 0 10% - 250 VLTI inldes World's largest unfilled apertures (siderostats, 1.8-m, 8-m). Longest overall VLTI Baseline 130m
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