天卫七1986

天卫七是位于天王星第11行星环边缘以外的卫星，它的轨道在天王星的同步轨道半径之内，因此受潮汐力的影响会逐渐接近天王星。

1986年1月20日，天卫七被美国的旅行者2号发现，当时临时命名为S/1986 U 8 2003年，通过哈勃望远镜才被正式看到。

Ophelia is a moon of Uranus. It was discovered from the images taken by Voyager 2 on January 20, 1986, and was given the temporary designation S/1986 U 8. It was not seen again until the Hubble Space Telescope recovered it in 2003. Ophelia was named after the daughter of Polonius, Ophelia, in William Shakespeare's play Hamlet. It is also designated Uranus VII.

Other than its orbit, size of 54 km × 38 km (34 mi × 24 mi), and geometric albedo of 0.062, little is known about it. In images taken by Voyager 2, Ophelia appears as an elongated object, with its major axis pointing towards Uranus. The ratio of axes of Ophelia's prolate spheroid is 0.7 ± 0.3.

Ophelia acts as the outer shepherd satellite for Uranus's ε ring. The orbit of Ophelia is within the synchronous orbit radius of Uranus, and is therefore slowly decaying due to tidal forces.