小行星35633和135356的历表研制及密近交会前后的轨道演化  

Ephemeris development for asteroids 35633 and 135356 and their orbital evolution induced by a close encounter

作　　者：李凡 袁烨 傅燕宁[1,3] LI Fan;YUAN Ye;FU YanNing(Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210033,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Astronomy and Space Science,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学院紫金山天文台,南京210033 [2]中国科学院大学,北京100049 [3]中国科学技术大学天文与空间科学学院,合肥230026

出　　处：《中国科学：物理学、力学、天文学》2021年第2期138-147,共10页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金(编号:11273066,11178006,11533004);中国科学院战略性先导科技专项(编号:XDB41000000)资助项目。

摘　　要：在已知(349)Dembowska高精度质量的情况下,通过考虑密近交会改进了小行星35633和135356的历表.本文由蒙特卡罗方法给出了改进历表的不确定度,并利用姚安高精度望远镜的观测数据验证了历表改进的可靠性.与未考虑密近交会因素的JPL历表比较的结果表明,两种轨道之间瞬时根数的差值在密近交会时刻附近快速变化,这体现了(349)Dembowska在交会中对天体轨道演化的影响.尽管这种影响在一定时间内并不会产生显著的观测效应,但在历表研制中不予以考虑会显著降低外推历表位置的精度.Based on the newly determined mass of(349)Dembowska,the ephemerides of two asteroids(35633 and 135356)were improved by taking into account the effects of their close encounter with(349)Dembowska.A Monte-Carlo method was used to determine the time-dependent uncertainty of the ephemerides.Reliability of the improvements were verified based on the observations from the Yaoan High Precision Telescope.The improved ephemerides were compared with those provided by Jet Propulsion Laboratory(JPL),for which the effects of close encounters were not considered.The results show that rapid and significant orbital evolution presents in a short time interval around the instant of the closest approach between the encountering bodies,which represents the effects of(349)Dembowska.Even though the effects will not be detectable by ground-based observations in a certain time,the extrapolation accuracy of ephemerides will decrease significantly without considering the effects when developing ephemerides.

关 键 词：历表 小行星 密近交会 

分 类 号：P135[天文地球—天体力学] V412.41[天文地球—天文学]