Specifications of the Subaru Telescope

  • The Subaru Telescope
    • Mounting: altitude-azimuth configuration
    • Primary mirror
      • Effective diameter: 8.2 m
      • Thickness: 20 cm
      • Weight: 22.8 t
      • Material: ulE (ultra-low thermal expansion glass)
      • Mean surface error: 0.000014 mm
      • Focal length: 15 m
    • Four foci
      • Primary focus: F2.0 with corrector
      • Cassegrain focus: F12.2
      • Nasmyth foci: F12.6 (optical and infrared)
    • Telescope size
      • Height: 22.2 m
      • Max width: 27.2 m
      • Weight: 555 t
    • Telescope characteristics
      • Max pointing speed: 0.5 deg/sec
      • Tracking accuracy: 0.1 arcsec -
      • Elevation: 10 - 89.5 deg.
    • Total angular resolution: 0.2 arcsec @ 2.15 micron

  • The Enclosure of the Subaru Telescope
    • Altitude: 4139 m
    • Latitude: 19d 49m 43s N
    • Longitude: 155d 28m 50s W
    • Type: cylindrical enclosure rotating with the telescope
    • Height: 43 m
    • Diameter at base: 40 m
    • Weight: 2000 t
    • Outer wall: Aluminum panel

  • Environment of the summit of Mauna Kea
    • Mean pressure: 600Pha
    • Mean temperature: -5 - +10 ?C.
    • Mean humidity: - 40%
    • Mean wind velocity: 7m/sec
    • Fraction of nights clear: 65%




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