天卫六1986

除了它的轨道，大约为20千米的半径以及几何反照率为0.08，事实上人们对它几乎一无所知。在旅行者2号的照片中，天卫六是一个细长的天体，长轴指向天王星。椭球形的天卫六轴比（长轴与短轴之比）为0.7 ± 0.2。

天卫六是天王星ε环内层牧羊犬卫星。天卫六的轨道与天王星轨道同步，因此由于潮汐减速而缓慢衰减。

天卫六与天卫十三非常接近5:3轨道共振。

Cordelia is the innermost known 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 7. It was not detected again until the Hubble Space Telescope observed it in 1997. Cordelia takes its name from the youngest daughter of Lear in William Shakespeare's King Lear. It is also designated Uranus VI.

Other than its orbit, size of 50 km × 36 km (31 mi × 22 mi), and geometric albedo of 0.056, little is known about it. In the Voyager 2 images, Cordelia appears as an elongated object with its major axis pointing towards Uranus. The ratio of axes of Cordelia's prolate spheroid is 0.7±0.2. Observations taken in 2001–2007 found that Cordelia had decreased in brightness by about a factor of five since the 1986 Voyager 2 flyby. The change in viewing geometry since then suggests that Cordelia may have a very flattened shape and be much smaller in size than inferred from previous measurements.

Cordelia acts as the inner shepherd satellite for Uranus's ε ring. Its orbit is within Uranus's synchronous orbit radius, and is therefore slowly decaying due to tidal deceleration. Cordelia is very close to a 5:3 orbital resonance with Rosalind.