从CCD图像确定小行星V星等的一种方法
A method for determining the V magnitude of asteroids from CCD images
摘要：
本文介绍了一种利用差示光度法测定小行星V星等的方法，并利用嘉士伯子午星表14（CMC 14）的数据对比较星进行了星等测定。大量合适的CMC 14恒星的可用性使得可以在不需要求助于更复杂的绝对测光或全天测光的情况下找到相当精确的星等（\pm 0.05等）。如果使用几颗CMC 14恒星的集合，则可能将精度提高到\pm 0.03等。这种方法预计是不太准确的恒星位于\pm 10度的银河赤道，由于过度的星际红化和恒星拥挤。
英文摘要：
We describe a method of determining the V magnitude of an asteroid using differential photometry, with the magnitudes of comparison stars derived from Carlsberg Meridian Catalogue 14 (CMC14) data. The availability of a large number of suitable CMC14 stars enables a reasonably accurate magnitude (\pm0.05 mag) to be found without having to resort to more complicated absolute or all-sky photometry. An improvement in accuracy to \pm0.03 mag is possible if an ensemble of several CMC14 stars is used. This method is expected to be less accurate for stars located within \pm10deg of the galactic equator owing to excessive interstellar reddening and stellar crowding.
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