Showalter Mark R, Lissauer Jack J
SETI Institute, 515 North Whisman Road, Mountain View, CA 94043, USA.
Science. 2006 Feb 17;311(5763):973-7. doi: 10.1126/science.1122882. Epub 2005 Dec 22.
Deep exposures of Uranus taken with the Hubble Space Telescope reveal two small moons and two faint rings. All of them orbit outside of Uranus's previously known (main) ring system but are interior to the large, classical moons. The outer new moon, U XXVI Mab, orbits at roughly twice the radius of the main rings and shares its orbit with a dust ring. The second moon, U XXVII Cupid, orbits just interior to the satellite Belinda. A second ring falls between the orbits of Portia and Rosalind, in a region with no known source bodies. Collectively, these constitute a densely packed, rapidly varying, and possibly unstable dynamical system.
利用哈勃太空望远镜对天王星进行的深度曝光揭示了两颗小卫星和两个暗淡的环。它们都在天王星先前已知的（主）环系统之外运行，但在大型经典卫星的内部。外侧的新卫星U XXVI Mab，其轨道半径大约是主环半径的两倍，并且与一个尘埃环共用其轨道。第二颗卫星U XXVII Cupid，在卫星贝琳达的轨道内侧运行。第二条环位于波西亚和罗莎琳德的轨道之间，处于一个没有已知源天体的区域。总体而言，这些构成了一个密集排列、快速变化且可能不稳定的动力学系统。
