Constraints on the Density and Internal Strength of 1I/’Oumuamua
Constraints on the Density and Internal Strength of 1I/’Oumuamua
复制标题
1I/’Oumuamua 密度和内部强度的约束
DOI：
--
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Michael Mommert
中科院分区：
文献类型：
--
作者：
A. McNeill;D. Trilling;Michael Mommert
1I/ ' Oumuamua是由全景巡天望远镜和快速反应系统（Pan-STARRS 1）于2017年10月19日发现的。与之前发现的所有小行星不同，这颗天体的离心率为e > 1.0，表明它起源于星际。自从这一发现以来，在有限的机会范围内，对该天体进行了几次光度和光谱研究。利用测量的光曲线振幅和旋转周期，我们发现，在三轴椭球假设下，密度范围1500 < ρ < 2800 kg m−3与观测值相符，不需要显着的内聚强度。我们还确定，在考虑相角效应和表面性质的潜在影响后，宽高比最可能为6±1:1。这一增长仍然显著，但低于其他一些估计。
1I/’Oumuamua was discovered by the Panoramic Survey Telescope and Rapid Response System (Pan-STARRS 1) on 2017 October 19. Unlike all previously discovered minor planets, this object was determined to have eccentricity e > 1.0, suggesting an interstellar origin. Since this discovery and within the limited window of opportunity, several photometric and spectroscopic studies of the object have been made. Using the measured light curve amplitudes and rotation periods we find that, under the assumption of a triaxial ellipsoid, a density range 1500 < ρ < 2800 kg m−3 matches the observations and no significant cohesive strength is required. We also determine that an aspect ratio of 6 ± 1:1 is most likely after accounting for phase-angle effects and considering the potential effect of surface properties. This elongation is still remarkable, but less than some other estimates.