Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/~miller/papers-and-meetings/90-Washington-AAS/abstract.pdf Дата изменения: Fri Feb 27 22:12:34 2009 Дата индексирования: Tue Nov 24 10:32:36 2009 Кодировка: Поисковые слова: кокон

A Study of Scheduling Strategies for Space and Ground Based Observatories G.E. Miller (CSC) and M.D. Johnston (STScI) Strategies for allocating telescope time fall between two extremes: Block scheduling allocates fixed intervals of time to specific observers, while integrated scheduling mixes observations from different observing programs. Many observatories use block scheduling in order to simplify the process of creating a schedule or because the proposer must be physically present to execute the observations. However, block scheduling can force compromises in the scientific program, e.g. programs which require short observations spread over a long time are difficult to accomodate, observations may be scheduled at non-optimal times and certain targets may not be visible during the allocated time. Another important strategy is that of dynamic re-scheduling to account for unpredictable, short term changes, such as atmospheric seeing at a ground-based observatory or discovery of phenomena uncovered in a survey. Using the Spike planning and scheduling tool, we have analyzed the tradeoffs in the overall scheduling strategies for a variety of parameters including the nature of the observation pool, and the observatory and instrument overheads. Both ground and space based observatories are analyzed. Our results can assist those operating or designing an observatory in choosing a mix of scheduling strategies which will best satisfy the objectives of the observatory. Additionally, these results show that certain design decisions can have a major impact on the efficiency of the schedule.

AAS Abstract

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