2.1m dome

2.1-M (82-Inch)
Telescope Data


Optical

Primary Mirror
diameter: 2.08 m (82 in)
focal length: 8.13 m (26.7 ft)
f-ratio: 3.90
field angle: 63.5 arc min
plate scale: 25.4 arc sec/mm

Cassegrain f/13.7 focus
focal length: 28.53 m (96.6 ft)
f-ratio: 13.65
field angle: 20 arc min
plate scale: 7.25 arc sec/mm

Coudé focus (not presently in use)
focal length: 47.70 m (156.5 ft)
f-ratio: 22.9
plate scale: 4.3 arc sec/mm


Mechanical

primary mirror weight: 1900 kg (4200 lbs)
primary mirror thickness: 29.8 cm (11.75 in)
primary mirror material: Pyrex
telescope tube diameter: 2.64 m (8 ft 8 in)
telescope tube length: 8.2 m (27 ft)
telescope weight: 41 t (45 tons)
polar axis bearings: ball radial and thrust bearings
declination axis bearings: taped roller bearings
dome diameter: 19 m (62 ft)
dome weight: 104 t (115 tons)


Instruments

Cassegrain f/13.7 focus

Cassegrain Spectrometer (es2)
CCD WHT Camera
Imaging Grism Instrument (IGI)
Imaging Grism Polarimeter (IGP)
Linear Polarimeter (POL)
Photometer (P45)
Sandiford Cassegrain Echelle Spectrometer (CE)


Historical

design: Charles Jones, Inc.
construction started: 1933
construction completed: 1939
telescope and dome contractor: Warner and Swasey Co.
optics: C. Ludin


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15 September 1999
UT Astronomy Program • The University of Texas at Austin • Austin, Texas 78712
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