根据热红外线干涉观测确定小行星（41）Daphne的物理性质
Determination of physical properties of the asteroid (41) Daphne from interferometric observations in the thermal infrared
摘要：
本文描述了用甚大望远镜干涉仪（VLTI）的中红外干涉仪（WIR）在热红外波段对小行星（41）达芙妮（Daphne）的干涉观测。利用热物理模型（TPM）首次推导出（41）达芙妮的大小和表面热性质，并将其用于干涉测量数据的解释。从我们的TPM分析中，我们使用从光学光变曲线和自适应光学图像推导出的非凸三维形状模型，推导出（41）达芙妮的体积等效直径为189 km（B.携带，私人通信）。另一方面，当使用Kaasalainen等人（2002. Icarus 159，369-395），根据表面粗糙度，（41）达芙妮的体积当量直径在194和209 km之间。在TPM分析中，小行星的形状被用作先验信息。不会尝试根据数据调整形状。只有小行星的大小及其热参数（热惯性、热惯性和粗糙度）根据数据进行了调整。我们估计我们的模型系统的不确定性是4%和7%的小行星体积当量直径的确定取决于是否使用非凸或凸的形状，分别。在热性能方面，我们推导出小于50 J m-2 s-0.5 K-1的表面热惯性的值，并且优选地在0和30 J m-2 s-0.5 K-1之间的范围内。我们的TPM分析还表明，达芙妮具有中等的宏观表面粗糙度。
英文摘要：
We describe interferometric observations of the asteroid (41) Daphne in the thermal infrared obtained with the Mid-Infrared Interferometric Instrument (MIDI) of the Very Large Telescope Interferometer (VLTI). We derived the size and the surface thermal properties of (41) Daphne by means of a thermophysical model (TPM), which is used for the interpretation of interferometric data for the first time. From our TPM analysis, we derived a volume equivalent diameter for (41) Daphne of 189 km, using a non-convex 3-D shape model derived from optical lightcurves and adaptive optics images (B. Carry, private communication). On the other hand, when using the convex shape of Kaasalainen et al. (2002. Icarus 159, 369-395) in our TPM analysis, the resulting volume equivalent diameter of (41) Daphne is between 194 and 209 km, depending on the surface roughness. The shape of the asteroid is used as an a priori information in our TPM analysis. No attempt is made to adjust the shape to the data. Only the size of the asteroid and its thermal parameters (albedo, thermal inertia and roughness) are adjusted to the data. We estimated our model systematic uncertainty to be of 4% and of 7% on the determination of the asteroid volume equivalent diameter depending on whether the non-convex or the convex shape is used, respectively. In terms of thermal properties, we derived a value of the surface thermal inertia smaller than 50 J m-2 s-0.5 K-1 and preferably in the range between 0 and 30 J m-2 s-0.5 K-1. Our TPM analysis also shows that Daphne has a moderate macroscopic surface roughness.
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