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

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

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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 des Éphémérides(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.

astrometryephemeridestime

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

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Yunnan Observatories,Chinese Academy of Sciences,Kunming 650216,China

University of Chinese Academy of Sciences,Beijing 100049,China

Key Laboratory of the Structure and Evolution of Celestial Objects,Chinese Academy of Sciences,Kunming 650216,China

Engineering Laboratory on Applied Astronomical Technology of Yunnan,Kunming 650216,China

School of Information Engineering,Kunming University,Kunming 650214,China

School of Computer Science and Information Engineering,Anyang Institute of Technology,Anyang 455000,China

Department of Computer Science,Jinan University,Guangzhou 510632,China

Sino-French Joint Laboratory for Astrometry,Dynamics and Space Science,Jinan University,Guangzhou 510632,China

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National Key R&D Program of ChinaNational Natural Science Foundation of China(NSFC)West Light Foundation of The Chinese Academy of Sciences Key scientific research projects of colleges and universities in He

2022YFE01168001217308523B16001

2024

10.1088/1674-4527/ad50b8

天文和天体物理学研究
中国科学院国家天文台

天文和天体物理学研究

CSTPCD
影响因子：0.406
ISSN：1674-4527
年,卷(期)：2024.24(7)