揭开(44)尼萨的面纱：三叶状结构的证据
Unmasking (44) Nysa: Evidence for a trilobate structure
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中文总结 AI 辅助
研究(44)尼萨的形态及卫星情况，用可见光波长自适应光学仪器观测并构建形状模型，发现其形态异常且有卫星，确定(44)尼萨是由主天体和小卫星组成的双星系统。
中文摘要 AI 辅助
背景：(44)尼萨是已知最大的E型小行星之一。光曲线反演模型表明它可能具有大双星系统中常见的拉长形状。目的：识别尼萨的形态以及可能环绕它的卫星的存在情况。方法：我们用可见光波长自适应光学仪器SHARK-VIS和SPHERE/ZIMPOL观测尼萨，以尽可能高的空间分辨率对其成像，并目视识别其表面特征。利用ADAM代码从这些图像和光度光曲线构建形状模型。结果：成像揭示了一种非常不寻常的形态，有多个不同的表面特征，包括两个最容易被解释为沟谷的明显山谷。在多个数据集的去卷积残差中识别出一颗微弱卫星。结论：我们确定(44)尼萨是一个双星系统，很可能由一个接触三体或高度不规则、连贯的主天体和一颗小卫星组成。
英文摘要
Context. (44) Nysa is one of the largest known E-type asteroids. Light curve inversion models have indicated that it may have an elongated shape commonly found in large binary systems. Aims. We aimed to identify the morphology and presence of possible satellites orbiting Nysa. Methods. We observed Nysa with the visible-wavelengths adaptive-optics instruments SHARK-VIS and SPHERE/ZIMPOL in order to image the object with the highest possible spatial resolution, and visually identified surface features on the object. A shape model was constructed from these images and photometric light curves using the ADAM code. Results. Imaging revealed a highly unusual morphology with multiple distinct surface features, including two distinct valleys most easily interpreted as colli. A faint satellite was identified in the deconvolution residuals in multiple datasets. Conclusions. We determine that (44) Nysa is a binary system most likely consisting of a contact-trinary or highly-irregular, coherent primary object and a small satellite.
