Make your own free website on


Moons, Rings, & ect...

Compisitions of Uranus
Voyages to Uranus!
Moons, Rings, & ect...
How we discovered Uranus
All About Us


Uranus has relative feartures in its apperance at visible wavelenghths.  Even from Voyager 2 at a distance of 80,000 km there were few features. 

Views of the New Moons of Uranus

Discovery image of S/1997 U 2
the brightest picture of the two new moons of Uranus. It name for know is S/1997 U 2 until they come up with a name for the satilite.  Notice the circle motion of the moon to the background stars. The images were taken roughly one hour apart on September 7, 1997. A faint asteroid in the main belt may also be observed and identified by its much faster rate of motion.
Discovery image of S/1997 U 1
This picture is a picture of Uranuses new two moons. It is known as S/1997 U 1 until the International Asronomical Union (also known as LAU ) comes up with a name for the satellite. The glare from Uranus, which is not pictured                                                                           in this picture because it                                                                           avoid saturating  the detector,                                         is visible at the right. 

 Nicer Color Image of S/1997 U 1
This shows another discovery image of faint new moons of Uranus. It is designated as S/1997 U 1 until the International Asronomical Union (IAU) comes up with a name for the satellite. The glare from Uranus, which was placed intentionally off the frame to avoid saturating the detector, is visible at the right. The moon must be located by looking at the above image. (Credit Brett Gladman, Canadian Institute for Theoretical Astrophysics and Cornell University)

Positions of the Moons Relative to Uranus
This diagram shows the position of the moons relative to Uranus. Uranus is shown at the center of the picture.  The circular orbits of the outermost two previously known moons (Titania and Oberon) surround the planet, and appear as ellipses because the orbits viewed from Earth are somewhat edge on. The four search fields for the discovery observations of September 6 and 7 surround the planet, each box shows one shot that was taken.  The fainter moon was discovered almost directly east of the planet.  The brighter moon was northwest at the time it was discoverd. The arcs that the satellites followed after discovery are shown, corresponding to the preliminary fits to the orbits of the moons, calculated by Brian Marsden of the Minor Planet Center at Harvard University.

Moon # Radius
Discoverer Date
 Cordelia VI 13 ? 49,750 Voyager 2 1986
 Ophelia VII 16 ? 53,760 Voyager 2 1986
 Bianca VIII 22 ? 59,160 Voyager 2 1986
 Cressida IX 33 ? 61,770 Voyager 2 1986
 Desdemona X 29 ? 62,660 Voyager 2 1986
 Juliet XI 42 ? 64,360 Voyager 2 1986
 Portia XII 55 ? 66,100 Voyager 2 1986
 Rosalind XIII 27 ? 69,930 Voyager 2 1986
 Belinda XIV 34 ? 75,260 Voyager 2 1986
 1986U10 XVIII 40 ? 75,000 Karkoschka 1999
 Puck XV 77 ? 86,010 Voyager 2 1985
 Miranda V 235.8 6.33e+19 129,780 G. Kuiper 1948
 Ariel I 578.9 1.27e+21 191,240 W. Lassell 1851
 Umbriel II 584.7 1.27e+21 265,970 W. Lassell 1851
 Titania III 788.9 3.49e+21 435,840 W. Herschel 1787
 Oberon IV 761.4 3.03e+21 582,600 W. Herschel 1787
 Caliban XVI 49 ? 7,169,000 Gladman 1997
 Stephano XX 10 ? 7,948,000 Gladman 1999
 Sycorax XVII 95 ? 12,213,000 Nicholson 1997
 Prospero XVIII 15 ? 16,568,000 Holman 1999
 Setebos XIX 15 ? 17,681,000 Kavelaars 1999


Artist's impression of Voyager 2 and Uranus.

Edit Text

Two Ring Systems Better Than One

Edit Text

  • Recently there has been two new moons and rings discovered orbiting around Uranus.


Uranus has a total of 21 moons the 5 that are pictured above are the largest of the 21 moons the others re much smaller.



How Many Moons Does It Have?
Uranus has at least fifteen moons. There are probably more, but this won't be known for sure until another spacecraft is sent to investigate.
The largest, and furthest away, of Uranus' moons are Miranda, Ariel, Umbriel, Titania and Oberon. The moons are named after characters in the stories of William Shakespeare and Alexander Pope.
The remaining ten moons are much smaller and a lot closer to the planet. They were discovered by the Voyager 2 spacecraft as it sped past the planet in 1986. Some of the smaller moons act as "shepherds", helping to keep some order in some of the rings. The others may be comets or asteroids that have been "captured" by the planet.

Does It Have Rings?
All the gas planets have rings, but the rings of Uranus are a very faint. The rings cannot be seen from Earth but the Voyager spacecraft showed them. Astronomers get a hint of the rings when they occasionally block the light of a star behind them. Even the Hubble Space Telescope cannot get a very good view of the rings. While the rings of Saturn are made up of fairly small pieces of bright white ices, the rings of Uranus seem to be made of larger chunks of very dark, rocky material. The darkness of the chunks may help explain why they cannot be seen from Earth.

Who discovered it? Uranus was the first planet to be discovered by an astronomer. It was discovered, accidentally, by British astronomer William Herschel in 1781