天王星卫星CCD（SRT）位置测量的数字图象处理

天然卫星的位置测量在天体测量和天体力学中都有重要意义。国外有人对天王星卫星位置测量应用新的图象处理方法得到了高精度的卫星观测资料。利用云南天文台１米望远镜上获得的两颗卫星的ＳＲＴ的ＣＣＤ观测资料进行了新老图象处理方法的比较研究。当用两颗卫星直接作定标测量ＣＣＤ的比例尺和指向时表明：主星晕的处理对卫星位置的测量非常重要。去晕处理后，测得的比例尺和指向的弥散将大为减少。

DIGITAL IMAGE PROCESSING OF THE CCD (SRT) POSITIONAL OBSERVATIONS OF TWO SATELLITES (ARIEL AND TITANIA) OF URANUS

The positional determination of natural satellites is very important in astrometry and celestial mechanics. Some researchers have performed very good astrometric observations of Uranian satellites with a new image processing technique. We compared the methods without and with halo-processing for the CCD (SRT-Separated Readout Technique) observations of Ariel and Titania carried out with the 1-meter telescope of Yunnan Observatory. When the two satellites were used to determine the CCD scale and orientation, it was clarified that the Uranian halo-processing is very important for the positional determination of satellites.