0.9m (36") Telescope
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Instruments
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Cassegrain f/13.5 (Dall-Kirkham) focus
The 0.9m telescope is no longer scheduled as a McDonald Observatory
research telescope. Currently, observing time on the telescope is used for public educational programs.
The programs consist of star parties for attendees of our Elder Hostel and
Teacher Education Workshops. Occasionally, the telescope is used for
special VIP viewing sessions.
Observers who would have asked for the 0.9m telescope in the past are
urged to request the 2.1m telescope
or the 0.8m telescope instead, as
appropriate to the nature of their programs.
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Cautions
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0.9m Cautions
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Optical
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Primary Mirror
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diameter:
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91.8cm (36.1")
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focal length:
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3.18m (125")
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f-ratio:
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3.5
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Cassegrain f/13.5
(Dall-Kirkham) focus
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focal length:
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12.27m (483")
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f-ratio:
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13.42
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field angle:
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20 arcmin
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plate scale:
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16.8 arcsec/mm
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Mechanical
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Primary Mirror
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weight:
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203kg (448 lbs)
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thickness:
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15.5cm (6.1")
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Telescope Tube
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diameter:
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1.19m (47")
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length:
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3.11m (10'2")
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Dome
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diameter:
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6.1m (20')
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Historical
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Construction
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completed:
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1956
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Contractor
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telescope:
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Boller and Chivens Division, the Perkin-Elmer Co.
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dome:
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McDonald Staff
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