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|Discovered by||William Herschel|
|Discovered in||January 11, 1787|
|Semi-major axis||435,910 km|
|Mean radius||436,300 km|
|Orbital period||8.706 d|
|Inclination||0.340° (to Uranus' equator)|
|Is a moon of||Uranus|
|Mean diameter||1577.8 km
|Surface area||7,820,000 km²|
|Mean density||1.72 g/cm³|
|Surface gravity||0.378 m/s2 (~0.039 g)|
|Escape velocity||0.77 km/s|
Name and pronunciation[change]
The names of Titania and the other four moons of Uranus then known were suggested by Herschel's son John Herschel in 1852 at the request of William Lassell, who had found Ariel and Umbriel the year before. Lassell had earlier supported Herschel's 1847 naming scheme for the seven then-known moons of Saturn and had named his newly-found eighth moon Hyperion in accordance with Herschel's naming scheme in 1848.
It is also designated Uranus III.
So far the only close-up images of Titania are from the Voyager 2 probe, which photographed the moon during its Uranus flyby in January, 1986. At the time of the flyby the southern hemisphere of the moon was pointed towards the Sun so only it was studied.
Although what its interior is made up of is uncertain, one model suggests that Titania is made of about 50% water ice, 30% silicate rock, and 20% methane-related organic compounds. A major surface feature is a huge canyon that dwarfs the scale of the Grand Canyon on Earth and is in the same class as the Valles Marineris on Mars or Ithaca Chasma on Saturn's moon Tethys.
On September 8, 2001, Titania occulted a faint star; this was a chance to both refine its diameter and ephemeris, and to detect any extant atmosphere. The data revealed no atmosphere to a surface pressure of 0.03 microbars; if it exists, it would have to be far thinner than that of Triton or Pluto.
- Herschel, "An Account of the Discovery of Two Satellites Revolving Round the Georgian Planet", Philosophical Transactions of the Royal Society of London, Vol. 77, pp. 125-129, 1787; and "On George's Planet and its satellites", Philosophical Transactions of the Royal Society of London, Vol. 78, pp. 364-378, 1788.
- "On the Discovery of Four Additional Satellites of the Georgium Sidus; The Retrograde Motion of Its Old Satellites Announced; And the Cause of Their Disappearance at Certain Distances from the Planet Explained", Philosophical Transactions of the Royal Society of London, Vol. 88, pp. 47-79, 1798.
- http://adsabs.harvard.edu//full/seri/AN.../0034//0000169.000.html Adsabs.harvard.edu Retrieved on 05-19-07
- http://www.obspm.fr/actual/nouvelle/mar02/titania.en.shtml Obspm.fr Retrieved on 05-19-07
- http://www.lesia.obspm.fr/~titania/results.html Lesia.obspm.fr Retrieved on 05-19-07