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1 July 1990 Parallel observing: how to get unlimited observing time on a large optical telescope
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A large telescope spends over 70 per cent of its time observing isolated objects on the telescope axis -an excessive waste of the available field of view. This paper describes a CCD camera which images the off-axis light on the William Herschel Telescope whilst an on-axis observer uses the telescope as normal. This enables a major background survey to be performed at minimal cost, and with no additional observing time. The cost of the system is about $150,000; by doubling the use of a telescope which costs $10,000 per night to run it pays for itself within a matter of weeks. Implementing similar systems on the new generation of large telescopes would ensure that the quality of background surveys will automatically keep pace with the advancing telescope technology.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Nicholas P. Rees, Craig D. Mackay, and Mike Disney "Parallel observing: how to get unlimited observing time on a large optical telescope", Proc. SPIE 1235, Instrumentation in Astronomy VII, (1 July 1990);


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