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Memo to Observers
June 7, 2004 —
pdf
Instruments
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Cassegrain f/8.8
Ritchey-Chretien focus
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CCD WHT Camera
Imaging Grism Instrument (IGI)
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Cassegrain f/17.7 focus
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Large Cass Spectrometer (LCS)
LCS-Spectropolarimeter (SPol)
Photometer (P45)
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Robert G. Tull Coudé Spectrograph
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Tull Spectrograph (TS1)
- Two foci available
Cross-Dispersed Echelle Spectrograph (TS2)
- Two foci available
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TCS
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107" TCS Manual
107" TCS Quick Start
107" TCS Troubleshooting
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Cautions
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2.7m Cautions
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Optical
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Primary Mirror
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diameter:
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2.72m (107")
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focal length:
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10.68m (35')
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f-ratio:
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3.93
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Cassegrain f/8.8
Ritchey-Chretien focus
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focal length:
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23.91m (78.4')
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f-ratio:
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8.8
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field angle:
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61.5 arcmin
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plate scale:
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8.62 arcsec/mm
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Cassegrain f/17.7 focus
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focal length:
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47.98m (157.4')
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f-ratio:
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17.65
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field angle:
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31 arcmin
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plate scale:
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4.29 arcsec/mm
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Coudé f/32.5 focus
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focal length:
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88.43m (290.1')
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f-ratio:
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32.54
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field angle:
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3 arcmin
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plate scale:
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2.32 arcsec/mm
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Mechanical
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Primary Mirror
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weight:
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3540kg (7800 lbs)
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thickness:
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31.8cm (12.5")
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material:
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fused silica
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Telescope Tube
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diameter:
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3.66m (12')
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length:
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9.75m (32')
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Telescope
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weight:
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145t (190 tons)
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Bearings
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polar axis:
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pressurized oil and radial thrust bearings
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dec axis:
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preloaded ball bearings
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Dome
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diameter:
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23m (76')
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weight:
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395t (435 tons)
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Historical
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Construction
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started:
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April 1966
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completed:
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October 1968
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Contractor
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design:
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Charles Jones, Inc.
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telescope:
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Westinghouse
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dome:
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C.H. Lovell Construction Co.
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optics:
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Davidson Optronics
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