2.7 m (107") Harlan J. Smith Telescope

Memo to Observers

June 7, 2004 [pdf]

See:
Observing Support: 2.7 m Telescope

• 2.7 m Cautions

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	200 t (220 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