Light-curve analysis and shape models of NEAs 7335, 7822, 154244 and 159402

arXiv - PHYS - Earth and Planetary Astrophysics Pub Date : 2024-09-05 DOI:arxiv-2409.03446

Javier Rodríguez Rodríguez, Enrique Díez Alonso, Santiago Iglesias Álvarez, Saúl Pérez Fernández, Alejandro Buendia Roca, Julia Fernández Díaz, Javier Licandro, Miguel R. Alarcon, Miquel Serra-Ricart, Noemi Pinilla-Alonso, Francisco Javier de Cos Juez

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Abstract

In an attempt to further characterise the near-Earth asteroid (NEA) population we present 38 new light-curves acquired between September 2020 and November 2023 for NEAs (7335) 1989 JA, (7822) 1991 CS, (154244) 2002 KL6 and (159402) 1999 AP10, obtained from observations taken at the Teide Observatory (Tenerife, Spain). With these new observations along with archival data, we computed their first shape models and spin solutions by applying the light curve inversion method. The obtained rotation periods are in good agreement with those reported in previous works, with improved uncertainties. Additionally, besides the constant period models for (7335) 1989 JA, (7822) 1991 CS and (159402) 1999 AP10, our results for (154244) 2002 KL6 suggest that it could be affected by a Yarkovsky-O'Keefe-Radzievskii-Paddack acceleration with a value of $\upsilon \simeq -7 \times 10^{-9}$ rad d$^{-2}$. This would be one of the first detections of this effect slowing down an asteroid.

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7335、7822、154244 和 159402 号近地天体的光曲线分析和形状模型

为了进一步描述近地小行星（NEA）群的特征，我们展示了在 2020 年 9 月至 2023 年 11 月期间获得的 38 条新的光曲线，这些光曲线是在西班牙特内里费岛泰德天文台（Teide Observatory）观测到的近地小行星 (7335) 1989 JA、(7822) 1991 CS、(154244) 2002 KL6 和(159402) 1999 AP10。利用这些新的观测数据和档案数据，我们采用光曲线反演法计算出了它们的第一个形状模型和自旋解。此外，除了(7335)1989 JA、(7822)1991 CS和(159402)1999 AP10的恒定周期模型之外，我们对(154244)2002 KL6的研究结果表明，它可能受到Yarkovsky-O'Keefe-Radzievski-Paddack加速度的影响，其值为$\upsilon \simeq -7 \times 10^{-9}$ rad d$^{-2}$。这将是首次探测到这种使小行星减速的效应。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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arXiv - PHYS - Earth and Planetary Astrophysics

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