Astrometric Observations of NEA 1998 HH49 Using the Daocheng 50 cm Telescope  

作　　者：Huan Xu Xiang-Ming Cheng Yi-Gong Zhang Teng-Fei Song Zhen-Jun Zhang Qing-Yu Peng 

机构地区：[1]Yunnan Observatories,Chinese Academy of Sciences,Kunming 650216,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Key Laboratory of the Structure and Evolution of Celestial Objects,Chinese Academy of Sciences,Kunming 650216,China [4]Engineering Laboratory on Applied Astronomical Technology of Yunnan,Kunming 650216,China [5]School of Information Engineering,Kunming University,Kunming 650214,China [6]School of Computer Science and Information Engineering,Anyang Institute of Technology,Anyang 455000,China [7]Department of Computer Science,Jinan University,Guangzhou 510632,China [8]Sino-French Joint Laboratory for Astrometry,Dynamics and Space Science,Jinan University,Guangzhou 510632,China

出　　处：《Research in Astronomy and Astrophysics》2024年第7期71-78,共8页天文和天体物理学研究（英文版）

基　　金：funded by the National Key R&D Program of China(grant No.2022YFE0116800);the National Natural Science Foundation of China(NSFC,grant No.12173085);the West Light Foundation of The Chinese Academy of Sciences Key scientific research projects of colleges and universities in Henan Province(grant No.23B16001)。

摘　　要：This study details an astrometric observation campaign of the Near-Earth Asteroid 1998 HH49,conducted with the aim of refining our understanding of its physical characteristics.Utilizing the 50 cm telescope located at the Wumingshan Mountain in Daocheng,Sichuan,images were obtained over four nights,from 2023 October 19 to October 22.These observations were processed using Astrometrica software,facilitating the precise determination of the asteroid's position.The observational results were compared with the ephemerides from three distinct sources to verify accuracy:the Jet Propulsion Laboratory(JPL)Horizons System,the Institut de Mécanique Céleste et de Calcul deséphémérides(IMCCE)Miriade,and the Near-Earth Objects Dynamic Site(NEODyS-2).When compared with the JPL ephemeris,a mean observed-minus-calculated(O-C)result of 0.″07 in the R.A.direction and-0.″35 in the decl.direction was yielded.Furthermore,the comparison with the IMCCE ephemeris yielded mean O-C results of 0.″08 in the R.A.direction and-0.″06 in the decl.direction.The comparison with the NEODyS-2 ephemeris yielded the mean O-C results of 0.″06 in R.A.and-0.″49 in decl.direction.The study's findings demonstrate a general consistency between the observed data and the ephemeris predictions,with minor discrepancies observed across the data sets.Notably,both the JPL and NEODyS-2 ephemerides show that the residuals in the decl.direction exceed those in the R.A.direction.The disparities may result from atmospheric differential color refraction,ephemeris discrepancies,observational errors,and other factors.Additionally,it is worth noting that further investigation is required due to the potential influence of additional factors.Overall,the Daocheng 50 cm Telescope exhibits the ability to conduct high-precision positional measurements.

关 键 词：ASTROMETRY EPHEMERIDES TIME 

分 类 号：P111[天文地球—天文学]