2.4m望远镜曝光时间计算器的设计和实现

An Exposure Time Calculator for the 2.4m Telescope of the Yunnan Observatory

望远镜的曝光时间计算器对于远程观测以及不熟悉整个观测系统的观测人员尤为重要,因为它可以帮助观测者制定合理的观测计划。设计并实现了高美古2.4m望远镜系统的曝光时间计算器(exposuretimecalculator,ETC),它可以根据望远镜及其终端设备的参数,通过计算给出待测天体曝光时间的参考值。这为观测者了解现有条件下极限观测能力,设置曝光时间或者是给定星等和曝光时间计算信噪比提供了依据。将ETC计算结果与实际测光标准星的数据进行了比较,结果表明ETC对测光标准星的计算结果是可靠的。

Currently,many foreign observatories provide the exposure time calculators（ETCs） for their observational systems,while few people carry out such work in China.An ETC is important for the observers who are unfamiliar with the observational system to plan for observations.The ETC of the 2.4m telescope at the Gaomeigu Station of the Yunnan observatory can give a referential value about the needed exposure based on the parameters of telescope and instruments.Observers can know the feasibility of the desired observations,determine the optimal exposures,or estimate the signal-to-noise ratios（SNRs） of objects according to the given values.From the comparison with the photometric data of standard stars,we have found the results of our ETC to be reliable.