双特洛伊小行星帕特洛克罗斯：斯皮策观测的热惯性
Eclipsing Binary Trojan Asteroid Patroclus: Thermal Inertia from Spitzer Observations
摘要：
利用斯皮策空间望远镜上的红外光谱仪（IRS），首次对L5-Trojan系统（617）Patroclus-Menoetius进行了中红外（8-33 μ m）观测，在两次阴影事件之前、期间和之后，有效地实时观测到小行星地面温度的变化，从而可以非常直接地确定其热惯性。一个新的详细的二元热物理模型，该模型考虑了系统的已知的相互轨道，任意组件的形状，以及在日食的存在下的热传导。我们得到两个局部热惯性值，代表各自的阴影区域：21+/14 MKS和6.4+/-1.6 MKS。平均热惯性估计为20+/-15 MKS，可能具有显著的表面异质性。这是特洛伊小行星的第一次热惯性测量，表明其表面覆盖着精细的风化层。帕特洛克罗斯和梅诺提乌斯的直径分别为106 +/-11和98+/-10公里，与先前的发现一致。结合已知的系统总质量，这意味着它的体积质量密度为1.08 +/-0.33 g/cm 3，明显低于L4-特洛伊小行星（624）Hektor的质量密度，并表明它的体积组成主要是水冰。
英文摘要：
We present mid-infrared (8-33 micron) observations of the binary L5-Trojan system (617) Patroclus-Menoetius before, during, and after two shadowing events, using the Infrared Spectrograph (IRS) on board the Spitzer Space Telescope.F or the first time, we effectively observe changes in asteroid surface temperature in real time, allowing the thermal inertia to be determined very directly. A new detailed binary thermophysical model is presented which accounts for the system's known mutual orbit, arbitrary component shapes, and thermal conduction in the presence of eclipses. We obtain two local thermal-inertia values, representative of the respective shadowed areas: 21+/14 MKS and 6.4+/-1.6 MKS. The average thermal inertia is estimated to be 20+/-15 MKS, potentially with significant surface heterogeneity. This first thermal-inertia measurement for a Trojan asteroid indicates a surface covered in fine regolith. The diameters of Patroclus and Menoetius are 106 +/- 11 and 98+/-10 km, respectively, in agreement with previous findings. Taken together with the system's known total mass, this implies a bulk mass density of 1.08 +/-0.33 g/cm3, significantly below the mass density of L4-Trojan asteroid (624) Hektor and suggesting a bulk composition dominated by water ice.
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