Basic Optical Data
| Primary Mirror |
| Radius of curvature |
11168.4 mm concave |
| Conic constant |
-1.1065654 |
| Mirror diameter |
2133.0 mm (Drawing WISCO-30030) |
| Clear aperture |
diam 2124.0 mm |
| Central hole |
diam 635 mm |
| Central obscuration |
diam 870 mm (f/7.6 secondary baffle) |
| F/7.6 Secondary Mirror |
| Distance from primary |
3885.0 mm |
| Radius of curvature |
5186.0 mm convex |
| Conic constant |
-5.46905 |
| Clear aperture |
diam 654.3 mm (CHECK) |
| Secondary to RC focus |
4929.7 mm |
| Instrument rotator to RC focus |
50.4 mm |
| Effective focal length |
16200.8 mm |
| Plate Scale |
12.69 arcsec/mm |
| Light-collecting area |
2.950 m² |
| Focus Encoder |
1.0 µ/unit (approx) |
|
|
| F/15 Secondary Mirror |
| Distance from primary |
4583.0 mm |
| Radius of curvature |
2453.9 mm convex |
| Conic constant |
-3.1227715 |
| Clear aperture |
374.7 mm (undersize) |
| Secondary to RC focus |
5627.7 mm |
| Instrument rotator to RC focus |
50.4 mm |
| Effective focal length |
31950 mm [CHECK] |
| Plate Scale |
6.46 arcsec/mm |
| f/15 cone diameter |
156.4 mm |
| Light-collecting area |
2.835 m² (cone installed) |
| Light-collecting area |
3.114 m² (cone removed) |
|
|
As Built Prescriptions
|
Telescope
Cassegrain Cage Mechanical Data
| Component |
Weight(lb) |
Moment (in-lb)* |
| Instrument rotator |
347 |
520 |
| Guider |
150 |
1200 |
| Allowable instrument |
500 |
|
| Total load |
1000 |
30000 |
* datum=back of primary mirror cell
Optical Layout Figure
Dome
- Lower shutter will vignette the beam for zenith distances greater than 62.3 degrees.
- With the lower shutter raised, vignetting will occur for zenith distances less than 23 degrees
Gold Guider
Guider Field of View
|
Updated on March 17, 2021, 7:22 am