Umbriel


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Umbriel

(ŭm`brēĕl'), in astronomy, one of the moons, or natural satellites, of UranusUranus
, in astronomy, 7th planet from the sun, at a mean distance of 1.78 billion mi (2.87 billion km), with an orbit lying between those of Saturn and Neptune; its period of revolution is slightly more than 84 years.
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Umbriel

(um -bree-ĕl) A satellite of Uranus, discovered in 1851 by William Lassell. Photographed by Voyager 2 in 1986, it is very dark with an albedo of only 0.18. It is heavily cratered, its most prominent feature being Skyund, a crater 100 km in diameter with a bright central peak. See also Uranus' satellites; Table 2, backmatter.

Umbriel

 

a satellite of the planet Uranus. Umbriel has a diameter of about 1,000 km and is at a mean distance of 267,000 km from the center of the planet. The satellite was discovered in 1851 by W. Lassell. The orbital plane of Umbriel is nearly perpendicular to the orbital plane of Uranus.

Umbriel

[′əm·brē·əl]
(astronomy)
A satellite of Uranus orbiting at a mean distance of 165,300 miles (266,000 kilometers) with a period of 4.144 days, and with a diameter of about 740 miles (1190 kilometers).
References in periodicals archive ?
Earlier this year, Buratti and her co-workers reported other evidence suggesting that Umbriel might be a Uranian oddity.
Umbriel asked the queen to touch Belinda with chagrin, for he knew that if she were gloomy and melancholy, bad temper would spread to half the world.
On the original image there is an indication above Uranus of Umbriel (14.
When Umbriel arrives, we learn that "Unnumber'd Throngs on ev'ry side are seen / Of Bodies chang'd to various Forms by Spleen" (4.
La Editorial Umbriel, que lo publica en espanol junto al Circulo de Lectores, pago 15 mil dolares por sus derechos cuando hace tres anos ninguna multinacional aposto por el texto; ahora ganar 60 millones de dolares, aunque perdio los derechos de La clave de Salomon, la siguiente obra de Brown que pretende ser una saga --ya vendida a la editorial Planeta por 1 millon 500 mil dolares--, cuyo tema girar en torno de las logias masonicas y desvelar la historia oculta de Estados Unidos.
One suggestion is that another object struck Umbriel and shattered, generating dark fragments that later settled all over the surface.
The brightest moons of Uranus--Ariel, Umbriel, Titania, and Oberon--are about as bright as Triton except for Titania, magnitude 14.
There is some controvery over the 1847 discovery dates of Ariel and Umbriel and this convoluted story is discussed in Alexander's book.
Next is Umbriel, far less dramatic, offering what Laurence Soderblom of the U.
15th mag Umbriel may also be seen if you have a large scope, but 16th mag Miranda will be a big challenge.
For example, on 2007 May 5, an occultation of Umbriel (IV; 1,500km across) by Oberon (II; 1,200km across) was observed by Faulkes Telescope South.