2.7 m (107") Harlan J. Smith Telescope

Memo to Observers

June 7, 2004 [pdf]

See:
Observing Support: 2.7 m Telescope

Instruments

Cassegrain f/8.8 Ritchey-Chretien focus

DIAFI

VIRUS-P

CCD WHT Camera

Imaging Grism Instrument (IGI)

Coudé f/32.5 focus

Robert G. Tull Coudé Spectrographs

Tull Spectrograph (TS1)

Two foci available

Cross-Dispersed Echelle Spectrograph (TS2)

Two foci available

TCS

107" TCS Manual

107" TCS Quick Start

107" TCS Troubleshooting

Optical

Primary Mirror

Diameter

2.72 m (107")

Focal length

10.68 m (35')

F-ratio

3.93

Cassegrain f/8.8
Ritchey-Chretien focus

Focal length

23.91 m (78.4')

F-ratio

8.8

Field of view

61.5 arcmin

Plate scale

8.62 arcsec/mm

Cassegrain f/17.7 focus

Focal length

47.98 m (157.4')

F-ratio

17.65

Field of view

31 arcmin

Plate scale

4.29 arcsec/mm

Coudé f/32.5 focus

Focal length

88.43 m (290.1')

F-ratio

32.54

Field of view

6 arcmin

Plate scale

2.32 arcsec/mm

Mechanical

Primary Mirror

Weight

3540 kg (7800 lbs)

Thickness

31.8 cm (12.5")

Material

fused silica

Telescope Tube

Diameter

3.66 m (12')

Length

9.75 m (32')

Telescope

Weight

145 t (190 tons)

Bearings

Polar axis

pressurized oil and radial thrust bearings

Dec axis

preloaded ball bearings

Dome

Diameter

23 m (76')

Weight

395 t (435 tons)

Historical

Construction

Started

April 1966

Completed

October 1968

Contractor

Design

Charles Jones, Inc.

Telescope

Westinghouse

Dome

C.H. Lovell Construction Co.

Optics

Davidson Optronics

2.7 m (107") Harlan J. Smith Telescope

Cassegrain f/8.8 Ritchey-Chretien focus

DIAFI

VIRUS-P

CCD WHT Camera

Imaging Grism Instrument (IGI)

Coudé f/32.5 focus

Robert G. Tull Coudé Spectrographs

Tull Spectrograph (TS1)

Cross-Dispersed Echelle Spectrograph (TS2)