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YING Jiajun, JI Jianghui, JIANG Haoxuan, TAN Dongjie, HU Shoucun, BAO Gang. Rotational Characteristics and Surface Thermal Environment of Asteroid (469219) Kamo‘oalewa: Target of the Tianwen-2 Mission (in Chinese). Chinese Journal of Space Science, 2025, 45(3): 736-748 doi: 10.11728/cjss2025.03.2025-yg04
Citation: YING Jiajun, JI Jianghui, JIANG Haoxuan, TAN Dongjie, HU Shoucun, BAO Gang. Rotational Characteristics and Surface Thermal Environment of Asteroid (469219) Kamo‘oalewa: Target of the Tianwen-2 Mission (in Chinese). Chinese Journal of Space Science, 2025, 45(3): 736-748 doi: 10.11728/cjss2025.03.2025-yg04
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Rotational Characteristics and Surface Thermal Environment of Asteroid (469219) Kamo‘oalewa: Target of the Tianwen-2 Mission

doi: 10.11728/cjss2025.03.2025-yg04 cstr: 32142.14.cjss.2025-yg04
  • 1.

    Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023

  • 2.

    School of Astronomy and Space Sciences, University of Science and Technology of China, Hefei 230026

  • 3.

    Center for Excellence in Comparative Planetology, Chinese Academy of Sciences, Hefei 230026

  • 4.

    School of Mechanical and Electrical Engineering, Chuzhou University, Chuzhou 239099

  • Received Date: 2025-04-17
  • Rev Recd Date: 2025-05-12
    • Available Online: 2025-05-27
    Abstract
  • This paper provides a comprehensive analysis of the orbital characteristics, rotation parameters, and relative motion with Earth of the near-Earth asteroid 2016 HO3 (Kamo‘oalewa). Through fitting the asteroid observed light curve, we preliminarily determined the orientation of its rotation axis as $ \lambda =67. 9°\pm {3. 1}^{\circ },\;\beta =-46. 0°\pm {10. 6}^{\circ } $. By simulating the forthcoming Tianwen-2 space mission, we predicted changes in the apparent magnitude of the asteroid as observed by the spacecraft during its approach phase. Using the Advanced Thermophysical Model (ATPM), we performed a detailed analysis of the surface temperature distribution of asteroid 2016 HO3, revealing detailed temperature distribution features under varying thermal inertia conditions. Finally, this paper outlines future research directions, highlighting the significant potential for improved accuracy in determining the asteroid rotational parameters and orbital properties through higher-resolution observations and longer-term data accumulation. The successful implementation of the Tianwen-2 mission will provide crucial data, further advancing our understanding of the origins and evolutionary histories of asteroids.

     

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