特洛伊小行星（3548）Eurybates卫星的探测--Lucy任务目标
Detection of a Satellite of the Trojan Asteroid (3548) Eurybates -- A Lucy Mission Target
摘要：
我们描述的特洛伊小行星（3548）Eurybates卫星的发现与哈勃太空望远镜获得的图像。这颗卫星在三个不同的时期被发现，两个在2018年9月，一个在2020年1月。该卫星在所有三个时期的亮度与d2 =1.2+/-0.4公里的有效直径一致。预计与欧律贝特的距离约为1700-2300公里，位置各不相同，与大范围的可能轨道一致。Eurybates是Lucy Discovery任务的目标，早期发现卫星为这次相遇的科学回报的显着扩大提供了机会。
英文摘要：
We describe the discovery of a satellite of the Trojan asteroid (3548) Eurybates in images obtained with the Hubble Space Telescope. The satellite was detected on three separate epochs, two in September 2018 and one in January 2020. The satellite has a brightness in all three epochs consistent with an effective diameter of d2 =1.2+/-0.4 km. The projected separation from Eurybates was s~1700-2300 km and varied in position, consistent with a large range of possible orbits. Eurybates is a target of the Lucy Discovery mission and the early detection of a satellite provides an opportunity for a significant expansion of the scientific return from this encounter.
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