相互逼近技术用于小行星702(Alauda)的高精度位置测量试验  被引量:1

The Experiment for the Application of Mutual Approximation Technique to High-precision Positional Measurement of Asteroid 702(Alauda)

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作  者:覃永贵 彭青玉[1,2] Qin Yonggui;Peng Qingyu(Department of Computer Science, Jinan University, Guangzhou 510632, China;Sino-French Joint Laboratory for Astrometry, Dynamics and Space Science, Jinan University, Guangzhou 510632, China)

机构地区:[1]暨南大学计算机科学系,广东广州510632 [2]暨南大学中法天体测量、动力学与空间科学联合实验室,广东广州510632

出  处:《天文研究与技术》2022年第2期118-124,共7页Astronomical Research & Technology

基  金:国家自然科学基金(11873026,11273014);国家自然科学天文联合基金重点项目(U1431227)资助.

摘  要:将相互逼近(Mutual Approximation)技术从天然卫星的天体位置测量拓展到小行星和邻近盖亚(Gaia)星表参考星的相对位置测量,希望获得更高的小行星位置测量精度。使用中国科学院云南天文台1 m光学望远镜在2020年11月11~12日对小行星702(Alauda)进行了观测试验。在观测资料中,目标小行星共有5次相互逼近事件。参考Gaia DR2(Data Release 2)星表,归算结果显示,在准确度方面,相互逼近技术与经典天体测量(四常数模型)具有良好的一致性;在测量精度方面,相互逼近技术在赤经、赤纬两个方向分别为6毫角秒和2毫角秒,相比经典天体测量在位置测量精度上有6~10倍的提高。This paper extends the mutual approximation technique from positional measurement of natural satellites to a relative positional measurement of an asteroid and its nearby Gaia reference star,hoping to obtain a higher positional precision of asteroids.1 m telescope at Yunnan Observatories of the Chinese Academy of Sciences is used to obtain the observations of the asteroid 702(Alauda)on November 11 and 12,2020.There are totally 5 approximation events of the asteroid with different reference stars in the observations.With reference to Gaia DR2(Data Release 2)catalogue,our results show that in terms of accuracy,the mutual approximation technique is in good agreement with the classical CCD astrometry(i.e.,a 4-constant plate model solution).The positional precision of the mutual approximation technique is 6 milli-arcseconds and 2 milli-arcseconds in right ascension and declination respectively,and the positional precision is improved obviously in compared with the classical CCD astrometry by a factor of 6-10.

关 键 词:相互逼近技术 天体测量 小行星702(Alauda) CCD图像处理 

分 类 号:P129[天文地球—天体测量]

 

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