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Discovery Channel Telescope – Technical Information

Technical

Specifications

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 30' unvignetted
Image scale (15 um Pixel) 0.32"/pix 0.12"/pixel
Image Quality (Note 1) 0.38" FWHM0.29" 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 Rate2° /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)


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TELESCOPE

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Primary Mirror

Secondary Mirror

Active Optics System

Optical Coating System

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Prime focus configuration images

Ritchey-Chretien configuration images

Index Logo CONTROLS

FIRST LIGHT INSTRUMENTS

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FACILITY

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Building design & construction

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Environment in the dome

SITE

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Site testing

Seeing histogram

Index Logo Environmental Assessment (NEPA)

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