ASTERIA——小行星热惯性分析仪
ASTERIA -- Asteroid Thermal Inertia Analyzer
AI总结：
本研究提出基于亚尔科夫斯基漂移检测与蒙特卡罗方法的小行星热惯性估计新工具ASTERIA，可独立于TPM处理更小的近地小行星，已估算38颗近地小行星热惯性，精度略低于TPM但未来适用性有望提升。
摘要：
目前仅能获取到数百个小行星的热惯性估计值，且这些结果几乎完全基于热物理建模（thermophysical modeling, TPM）。我们提出了一种全新的热惯性估计方法：小行星热惯性分析仪（Asteroid Thermal Inertia Analyzer, ASTERIA）。ASTERIA模型的核心是基于亚尔科夫斯基漂移检测的蒙特卡罗方法。我们在小行星贝努（Bennu）以及10颗特征明确的近地小行星（near-Earth asteroids, NEAs）上验证了该模型，这些小行星均有通过TPM得到的可靠热惯性估计值。测试结果表明，ASTERIA能给出与文献值一致的可靠结果。\n该新方法独立于TPM，可对结果进行独立验证。由于亚尔科夫斯基效应在小型小行星上更为显著，与TPM相比，ASTERIA的显著优势在于能够处理尺寸更小的小行星，而TPM通常缺乏这类小行星的输入数据。我们使用ASTERIA估算了38颗近地小行星的热惯性，其中31颗是亚千米级小行星，样本中有29个天体被归类为潜在危险小行星。\n在局限性方面，ASTERIA的精度略低于TPM。由于目前尚未在主带小行星中检测到亚尔科夫斯基效应，该模型的适用范围仅限于近地小行星。不过，随着即将开展的巡天项目，我们预计与ASTERIA相关的输入参数的高质量测量值将大幅增加，这必将提升ASTERIA生成结果的可靠性，并拓宽该模型的适用范围。
英文摘要：
Thermal inertia estimates are available for a limited number of a few hundred objects, and the results are practically solely based on thermophysical modeling (TPM). We present a novel thermal inertia estimation method, Asteroid Thermal Inertia Analyzer (ASTERIA). The core of the ASTERIA model is the Monte Carlo approach, based on the Yarkovsky drift detection. We validate our model on asteroid Bennu plus ten well-characterized near-Earth asteroids (NEAs) for which a good estimation of the thermal inertia from the TPM exists. The tests show that the ASTERIA provides reliable results consistent with the literature values. The new method is independent from the TPM, allowing an independent verification of the results. As the Yarkovsky effect is more pronounced in small asteroids, the noteworthy advantage of the ASTERIA compared to the TPM is the ability to work with smaller asteroids for which TPM typically lacks the input data. We used the ASTERIA to estimate the thermal inertia of 38 NEAs, with 31 of them being sub-km asteroids. Twenty-nine objects in our sample are characterized as Potentially Hazardous Asteroids. On the limitation side, the ASTERIA is somewhat less accurate than the TPM. The applicability of our model is limited to NEAs, as the Yarkovsky effect is yet to be detected in main-belt asteroids. However, we can expect a significant increase in high-quality measurements of the input parameters relevant to the ASTERIA with upcoming surveys. This will surely increase the reliability of the results generated by the ASTERIA and widen the model's applicability.
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