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
Imaging Grism Instrument (IGI)
Coudé f/32.5 focus
Robert G. Tull Coudé Spectrographs
Two foci available
Cross-Dispersed Echelle Spectrograph (TS2)
Two foci available
TCS
Optical
|
Primary Mirror |
|
|
Diameter |
2.72 m (107") |
|
Focal length |
10.68 m (35') |
|
F-ratio |
3.93 |
|
Cassegrain f/8.8 |
|
|
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
Imaging Grism Instrument (IGI)
Coudé f/32.5 focus
Robert G. Tull Coudé Spectrographs