Calculation of the Non-Gravitational A2 Parameter Using Ground-Based Observations of the Apparent Close Approaches between Near-Earth Asteroids and Gaia Stars

IF 0.6 4区物理与天体物理 Q4 ASTRONOMY & ASTROPHYSICS Solar System Research Pub Date : 2024-07-12 DOI:10.1134/s003809462470031x

M. Yu. Khovrichev, D. A. Bikulova, D. L. Gorshanov

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Abstract

The Yarkovsky effect is one of the noticeable factors in the orbital evolution of near-Earth asteroids (NEAs). The A₂ non-gravitational parameter describes the corresponding acceleration in the NEA motion model. This parameter can be derived from astrometric observations of the NEA. We present the results of astrometric observations of two NEAs (2010 XC15 and 2014 HK129). The measurements were performed with the MTM-500M telescope (Mountain Astronomical Station of the Pulkovo Observatory). The modified Gaia star apparent approach technique was applied. As a result, the astrometric accuracy of our observations reached the 0.05 arcsec level. It allowed us to estimate the A₂ values of the 2010 XC15 asteroid: –139.5 × 10^–15 ± 20.2 × 10^–15 au/d². It is in good agreement with the NASA JPL estimate for this asteroid. The 2014 HK129 A₂ parameter formal value extracted from our data is 61.3 × 10^–15 ± 1583.4 × 10^–15 au/d². Introduction of this A₂ value into the asteroid motion model provides a significant decrease (about 0.05–0.1 arcsec) of the (O–C) values for the first epoch of 2014 HK129 observations. It can be considered as faint evidence of the reality of Yarkovsky drift for the 2014 HK129 asteroid.

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利用近地小行星与盖亚星之间的近距离观测数据计算非引力 A2 参数

摘要雅尔科夫斯基效应是近地小行星（NEAs）轨道演化的显著因素之一。A2非重力参数描述了近地小行星运动模型中的相应加速度。该参数可通过对近地小行星的天体测量观测得出。我们展示了对两个近地小行星（2010 XC15 和 2014 HK129）的天体测量观测结果。测量是使用 MTM-500M 望远镜（普尔科沃天文台山地天文站）进行的。测量采用了经过改进的盖亚星视线接近技术。因此，我们的观测天体测量精度达到了 0.05 弧秒的水平。这使我们能够估算出 2010 XC15 小行星的 A2 值：-139.5 × 10-15 ± 20.2 × 10-15 au/d2。这与 NASA JPL 对这颗小行星的估计值十分吻合。从我们的数据中提取的 2014 HK129 A2 参数正式值为 61.3 × 10-15 ± 1583.4 × 10-15 au/d2。将这一 A2 值引入小行星运动模型后，2014 HK129 观测的第一个纪元的（O-C）值显著下降（约 0.05-0.1 弧秒）。这可以被视为2014 HK129小行星存在Yarkovsky漂移的微弱证据。

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来源期刊

Solar System Research 地学天文-天文与天体物理

CiteScore

1.60

自引率

33.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Solar System Research publishes articles concerning the bodies of the Solar System, i.e., planets and their satellites, asteroids, comets, meteoric substances, and cosmic dust. The articles consider physics, dynamics and composition of these bodies, and techniques of their exploration. The journal addresses the problems of comparative planetology, physics of the planetary atmospheres and interiors, cosmochemistry, as well as planetary plasma environment and heliosphere, specifically those related to solar-planetary interactions. Attention is paid to studies of exoplanets and complex problems of the origin and evolution of planetary systems including the solar system, based on the results of astronomical observations, laboratory studies of meteorites, relevant theoretical approaches and mathematical modeling. Alongside with the original results of experimental and theoretical studies, the journal publishes scientific reviews in the field of planetary exploration, and notes on observational results.