根据互食观测对双星小行星22 Kalliope的大小和体积密度的新测定
New determination of the size and bulk density of the binary asteroid 22 Kalliope from observations of mutual eclipses
摘要：
2007年，M型双星小行星22 Kalliope达到了它的一个年分点。因此，它的小卫星莱纳斯的轨道平面与太阳的视线紧密对齐，从而产生了一个共同的日食季节。为了捕捉其中的几个事件，IMCCE组织和协调了一次专门的国际测光观测活动，该活动是在业余-专业合作的基础上进行的。在这项工作中发布了汇编的观察结果集。我们开发了一个相关的模型，这些事件，包括一个地形形状模型的Kalliope细化在目前的工作中，Linus的轨道解决方案，以及测光效果的阴影的一个组件落在其他。通过将该模型拟合到仅有的两个完整记录的事件，我们得出了Kalliope的等效直径的新估计为166.2+/-2.8km，比其IRAS直径小8%。至于Linus的直径，被认为是纯粹的球形，估计为28+/-2公里。这一显著的“缩短”使Kalliope的体积密度为3.35+/-0.33g/cm3，显著高于过去的测定，但更符合其分类学类型。可以推断出对组合物的一些约束。
英文摘要：
In 2007, the M-type binary asteroid 22 Kalliope reached one of its annual equinoxes. As a consequence, the orbit plane of its small moon, Linus, was aligned closely to the Sun's line of sight, giving rise to a mutual eclipse season. A dedicated international campaign of photometric observations, based on amateur-professional collaboration, was organized and coordinated by the IMCCE in order to catch several of these events. The set of the compiled observations is released in this work. We developed a relevant model of these events, including a topographic shape model of Kalliope refined in the present work, the orbit solution of Linus as well as the photometric effect of the shadow of one component falling on the other. By fitting this model to the only two full recorded events, we derived a new estimation of the equivalent diameter of Kalliope of 166.2+/-2.8km, 8% smaller than its IRAS diameter. As to the diameter of Linus, considered as purely spherical, it is estimated to 28+/-2 km. This substantial "shortening" of Kalliope gives a bulk density of 3.35+/-0.33g/cm3, significantly higher than past determinations but more consistent with its taxonomic type. Some constraints can be inferred on the composition.
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