Physical parameters of Subaru Telescope

Observatory

• Latitude: +19° 49' 43'' N
• Longitude: 155° 28' 50'' W
• Altitude: 4139 m
• Mounting: altitude-azimuth (Alt-Az)

Telescope

Telescope size

• Height: 22.2 m
• Maximum width: 27.2 m
• Weight: 555 t

Primary mirror

• Effective diameter: 8.2 m
• Thickness: 20 cm
• Weight: 22.8 t
• Material: ULE (ultra-low thermal expansion glass)
• Mean surface error: 14 nm
• Focal length: 15 m
• Reflectivity

Foci

• Primary focus: F/2.0 (with corrector)
• Cassegrain focus: F/12.2
• Nasmyth foci: F/12.6 (optical and infrared)

Enclosure

• Cylindrical enclosure rotating with telescope
• Height: 43 m
• Diameter at base: 40 m
• Weight: 2000 t
• Outer wall: Aluminum panel