|
Major Optical Specifications of the OMI
|
| Parameter |
Specification |
| Aperture (clear) |
1.016 m (Open Back Cellular) |
| Mode |
Prime Focus |
| f/ratio |
2.4163 |
| Focal Length (effective) |
2454.95 mm |
| Field Flattener/corrector |
135 mm image circle, 6% vignetting |
| Field Flattener/corrector |
0.4/0.7" (4.7/8.3 um) 80%
spot in the r' |
| Field Flattener/corrector |
4 lens design fused silica (x3)
and CaF2 |
| Areal Central Obstruction |
17% |
| Mirror Thickness |
146 mm (5.75"), Cellular Borofloat |
| Field of View |
5 degrees² |
| Image scale |
0.76"/pixel |
| Expected Image Quality |
~1.25" FWHM |
| Spectral range |
350-1000 nm |
| Filters |
u', g', r', i', z'
+ wL (420-870 nm) |
| Active Optics (Hexapod) |
+/-2" in X,Y,
+/-1" in Z, +/-1 u Repeat. |
| Active Optics |
Lateral motion, Tip/Tilt, Rotate,
Focus |
| Active Optics |
All Sky Auto-Collimation |
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Major Mechanical Specifications of the
OMI
|
|
Parameter
|
Specification
|
| Mount type |
Equatorial One Tyne Fork |
| Drive topology |
Dual Harmonic |
| R.A. and DEC Disc size |
1.016 m (40") |
| Periodic Error/Period |
<2" 20 min , peak-to-peak |
| Maximum Slew rate |
4°/s |
| Tracking Error |
<0.05" |
| Pointing Error |
<10 arcsec rms (zenith to 30deg
alt.) |
| Guider |
On-Axis Camera, same
focal plane |
| OTA |
Carbon Fibre Sandwich Core |
| 1-m Mirror Mass |
68 Kg (150 lbs.) |
| OTA Mass |
~200 kg |
| Mount Mass |
~200 kg |
| Dome Type |
3/4 Sphere Calotte, 4.9 m I.D. |
| Dome Ground Elevation |
~3 m |
|
Dome slit width
|
1.524m (60") |
|
Major Site Specifications of the OMI
|
| Parameter |
Specification |
| Latitude |
N 45º 01' 37.4" |
| Longitude |
W77º 05' 57.4" |
| Altitude |
375 m |
| Sky Brightness |
21.82 mag/arcsec² (v) |
| Horizon exposure |
<2º |
| Ground |
80 acres cleared on a hilltop |
| Observable window |
>1100 hrs clear dark hours (Kingston)
|
|
Major Science Specifications of the OMI
|
| Parameter |
Specification |
| Limiting Magnitude |
25/25.5 (1800s, s/n=3,
r'/L, Zθ=0º) |
| Photometry |
1σ=0.001 mag.
(1500s, r', 17th mag) |
| Astrometry |
0.03" (s/n=20. FWHM=1.25") |
| Surveys |
5000 deg² (8 hours, mag=22,
s/n=3, r') |
| Spectral Range |
350-1000 nm, with the ugriz filters
|
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Major Camera Specifications of the OMI
|
| Parameter |
Specification |
| Sensor |
STA1600A |
| Array Size |
10580 X 10560 pixels |
| Array Size |
95.22 X 95.22 mm |
| Spectral range |
300-1000 nm |
| Illumination |
Thinned back with enhanced UV coating |
| Quantum Efficiency |
95% in the r' |
| Pixel Pitch |
9.0 X 9.0 u |
| Total Number of Pixels |
111,724,800 |
| Dark Noise |
1e-/pix/hr |
| Read Noise/Download Time |
<4e-/14s (full array) |
| Read Noise/Download Time |
12e-/1.4s (full array) |
| Cooling Temperature |
-100ºC (Cryo-Tiger) |
| Well Size |
80,000 e- |
| Quantization |
16 bits |
| Image size |
223 MB (monochromatic, 16 bits/pixel) |
| Image size |
670 MB (tricolor, 48 bits/pixel) |
