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Specifications

Optical Parameter

Optical System Ritchey-Chretien
Aperture 3,780mm
Focal Length 22,692mm (F/6)
Focus Nasmyth
Field of View φ12arcmin (φ79.2mm)
Image Scale 9.09arcsec/mm

Mechanical Parameter

Mount Alt-Az
Observable Range El:20deg- 89deg
Az:±270deg
Maximum Velocity El:3deg/s, Az:4deg/s
Acceleration El:0.6deg/s2, Az:0.8deg/s2
Pointing Accuracy5arcsec (rms)
Tracking Accuracy3arcsec (10min)
Autoguider1arcsec (60min)

Dome

Diameter14m
Slit Width4.8m
Maximum Speed4deg/s
Fixed Point Longitude +133° 35' 48".2
Latitude +34° 34' 36".8
Elevation 354.8m

Details of the Optical Parameter

Primary Mirror Clear Aperture 3,780mm
Mechanical Aperture 3,780mm
Radius of Curvature 10,000mm
Conic Constant -1.034609
Segments 6 inner and 12 outer segments
Material Clearceram-Z
Coating Aluminum with Protected Coating
Secondary Mirror Clear Aperture 1,059mm
Mechanical Aperture 1,080mm
Radius Curvature 3334.8mm
Conic Constant -2.73112
Material Clearceram-Z
Coating Aluminum with Protected Coating
Tertiary Mirror Clear Aperture 1,019.6x721.0mm
Mechanical Aperture 1,041.5x742.9mm
Radius Curvature infinity
Material Clearceram-Z
Coating Aluminum with Protected Coating
Image Plane Radius Curvature 1,425mm
Distance M1-M23,700mm
M2-M33,000mm
M3-Focal Plane 2,900mm
Backfocus 120mm
Optical Design opt_layout