Major Optical Specifications of the DCT | ||
| Parameter | Prime Focus (future) | RC Focus (first light) |
| Clear Aperture | 4.20 m | 4.25 m |
| Effective f/ratio | 2.3 | 6.1 |
| Areal Central Obscuration | 11% | 13% |
| Linear Field of View | 2° | 30' unvignetted |
| Image scale (15 um Pixel) | 0.32"/pix | 0.12"/pixel |
| Image Quality (Note 1) | 0.38" FWHM | 0.29" FWHM |
| ADC | Included | Optionally removable |
| UV Cutoff | 360 nm | 300 nm (w/o ADC) |
| Note 1. Image quality includes all effects except free-atmosphere seeing. | ||
Major Mechanical Specifications of the DCT | |
| Parameter | Specification |
| Operating Azimuth Range | +/- 270° |
| Operating Zenith Angle Range | 0.4° < Z < 85 ° |
| Maximum Slew Rate | 2° /s |
| Retargeting Time | < 8 sec for 2° move |
| Pointing Error | < 2" rms |
| Pointing Stability | < 0.1" jitter with 0.1"/min drift |
| Non-sidereal object track rates | > 5"/s |
| Guiders | Non-Sidereal capability |
| Prime/RC Focus Selection | Interchangeable Top End |
| Nominal RC Focus Payload | 1500 kg (Cassegrain) 4500 kg x2 (Nasmyth) 200 kg x4 (Bent-Cassegrain) |
TELESCOPE
Prime focus configuration images
Ritchey-Chretien configuration images
FIRST LIGHT INSTRUMENTS
FACILITY
Building design & construction
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