Lucy Target（11351）Leucus的凸形和旋转模型
Convex Shape and Rotation Model of Lucy Target (11351) Leucus from Lightcurves and Occultations
摘要：
我们报告了露西任务目标（11351）Leucus在2017年，2018年和2019年显灵期间获得的新光度学光曲线观测。我们将这些数据与五个时期（Buie等人，2020年）捕获的恒星掩星相结合，以确定恒星旋转周期，自旋轴方向，凸形模型，物体的绝对尺度，其几何形状，以及目标的光度特性模型。我们发现Leucus是一个自旋轴位于天空投影半径3°（1 $σ$）的椭圆形旋转体，其旋转轴位于J2000椭圆坐标（$λ=208°$，$β=+77°$）或J2000赤道坐标（RA=248 $°$，Dec=+58 $°$）的半径范围内。将恒星周期精确到$P_{sid}=445.683\pm0.007$ h。凸形模型是不规则的，最大维数为（60.8，39.1，27.8）公里。凸模型占全球功能的掩星剪影，虽然微小的偏差表明，当地和全球的凹。我们确定了一个几何参数$p_V=0.043\pm0.002$。推导出的相位曲线支持的D型分类的白。
英文摘要：
We report new photometric lightcurve observations of the Lucy Mission target (11351) Leucus acquired during the 2017, 2018 and 2019 apparitions. We use these data in combination with stellar occultations captured during five epochs (Buie et al. 2020) to determine the sidereal rotation period, the spin axis orientation, a convex shape model, the absolute scale of the object, its geometric albedo, and a model of the photometric properties of the target. We find that Leucus is a prograde rotator with a spin axis located within a sky-projected radius of 3° (1$σ$) from J2000 Ecliptic coordinates ($λ=208°$, $β=+77°$) or J2000 Equatorial Coordinates (RA=248$°$, Dec=+58$°$). The sidereal period is refined to $P_{sid}=445.683\pm0.007$ h. The convex shape model is irregular, with maximum dimensions of (60.8, 39.1, 27.8) km. The convex model accounts for global features of the occultation silhouettes, although minor deviations suggest that local and global concavities are present. We determine a geometric albedo $p_V=0.043\pm0.002$. The derived phase curve supports a D-type classification for Leucus.
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