Umbriel (moon)
Umbriel
Umbriel
Click image for description Discovery Discovered by
William Lassell Discovered in
October 24, 1851 Orbital characteristics Semi-major axis
266,000 km Eccentricity
0.0039 Periastron (Periuranion) ...
Umbriel
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Umbriel
Related Category: Astronomy: General
(m´brl´´), in astronomy, one of the moons, or natural satellites, of Uranus.
Umbriel
Uranus II
Umbriel [UM-bree-ul] is the darkest satellite of Uranus. It is about the same size as Ariel and has about the same density. The surface appears to be old with large craters and does not change much from one location to another.
Mysterious Umbriel
is an enigma. It has a surface of only 10-15%, while the rest of the Uranian satellites found inside and outside Umbriel's orbit are much brighter.
Umbriel
A satellite of Uranus about 400 km in diameter (period 4.1 days). Discovered by Lassell in 1851.
Umklapp Scattering ...
UMBRIEL
Umbriel is one of the larger of the 18 moons of , and the darkest. It has a heavily-cratered surface, indicating an old surface. It has a bright ring at its top (probably a crater floor) called a fluorescent cheerio.
Umbriel is heavily cratered with no observable geologic activity.
References
Arnett, W. "The Nine Planets: Umbriel." .
Umbriel's heavily catered surface gives scientists a lot of information about this world. It means that Umbriel has not been resurfaced for a long time, probably since it was first formed.
Umbriel is covered in craters and shows almost no sign of geological activity. Its surface is probably similar to what it was shortly after the formation of the solar system.
Ariel, Umbriel, Belinda
Plays by William Shakespeare:
A Midsummer Night's Dream: Titania, Oberon, Puck
The Tempest: (Ariel), Miranda, Caliban, Sycorax, Prospero, Setebos, Stephano, Trinculo, Francisco, Ferdinand
King Lear: Cordelia ...
The moons Umbriel and Ariel each are about 75O miles in diameter. In NASA's 1986 pictures at right, Voyager 2 was about 346,000 miles from Umbriel.
Oberon and Umbriel display a dense population of large impact craters, similar to the lunar highlands and many of the oldest terrains in the solar system.
Oberon and Umbriel appear quite similar though Oberon is 35% larger. All of Uranus' large moons are a mixture of about 40-50% water ice with the rest rock, a somewhat larger fraction of rock than Saturn's large moons such as Rhea.
Next comes Umbriel, equal in size to Ariel, but with a bland, nondescript surface.
Umbriel (NASA Thesaurus / NASA SP-7, 1965) A satellite of Uranus at a mean distance of 267,000 kilometers. Umi, U Min (NASA SP-7, 1965) International Astronomical Union abbreviations for Ursa Minor. See constellation.
With the same instrument, he further detected, on the 19th of September 1848, Hyperion, the seventh of Saturn's attendants, and, on the 24th of October 1851, Ariel and Umbriel, the interior moons of Uranus.
The next two, Umbriel and Ariel, were found in 1851 by the British astronomer William Lassell (1799-1880).
British astronomer William Lassell found the next largest, Ariel and Umbriel, in 1851. Gerard Kuiper found the smallest, Miranda, in 1948.
The five main satellites are Miranda, Ariel, Umbriel, Titania and Oberon. The Uranian satellite system is the least massive among the gas giants; indeed, the combined mass of the five major satellites would be less than half that of Triton alone.
Literary Moons: Titania, Oberon, Ariel, and Umbriel
For a man who made his reputation by counting and plotting the locations of thousands of stars, astronomer John Herschel had a poetic heart. In 1851, he named the four largest moons of Uranus.
Ariel and Umbriel both appear to be the same size, yet Ariel's surface shows evidence of ice volcanism and tectonics, while Umbriel's surface is just full of craters.
Umbriel (astronomy)
asteroid (astronomy)
asteroid belt (astronomy)
comet (astronomy)
comet tail (astronomy)
deferent (astronomy)
dirty snowball model (astronomy)
dwarf planet (astronomy)
elongation (astronomy)
epicycle (astronomy) ...
Two further moons were discovered by the British astronomer William Lassell in 1851 and named Ariel and Umbriel, after characters in Alexander Pope's Rape of the Lock.
URANUS U_RINGS PUCK MIRANDA ARIEL UMBRIEL TITANIA OBERON or URANUS U_RINGS PUCK MIRANDA ARIEL UMBRIEL TITANIA OBERON or URANUS U_RINGS PUCK MIRANDA ARIEL UMBRIEL TITANIA OBERON
Neptune targets: ...
Titania may have once been hot enough to be liquid, but its interior may have cooled after its surface already froze and so when the later expansion of internal freezing probably cracked its surface. Umbriel and Oberon are more heavily cratered, ...
The following image (Ref) shows the 5 largest satellites of Uranus: Miranda, Ariel, Umbriel, Titania, and Oberon (here is further discussion about Oberon). There are 10 additional small satellites.
The satellites of Uranus ...
The surface of Miranda, the smallest of these, shows evidence of extensive geologic activity. Umbriel's surface is dark, Titania and Ariel have trenches and faults, ...
" The next two are Ariel and Umbriel, discovered by William Lassell in 1851 and given names from Alexander Pope's "Rape of the Lock". Other moons, where named, also take their names from works by these two authors.
Prospero, Stephano, Setebos, Cordelia, Ophelia, Bianca, Cressida, Desdemona, Juliet, Portia, Rosalind, Belinda, Puck, Miranda, Ariel, Umbriel, Titania, Oberon.
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2 C!s I like it! ...
The portion of a shadow cone in which none of the light from an extended light source (ignoring refraction) can be observed. [S92]
Umbriel ...
Uranus has 27 known moons. The names for these moons are chosen from characters from the works of Shakespeare and Alexander Pope. The five main satellites are Miranda, Ariel, Umbriel, Titania and Oberon.
Uranus' known moons are (from nearest to furthest from the planet): Cordelia, Ophelia, Bianca, Cressida, Desdemona, Juliet, Portia, Rosalind, Belinda, Puck, Miranda, Ariel, Umbriel, Titania, and Oberon.
made of air - in Alexander Pope's poem "Rape of the Lock" (a name shared by the mischievous spirit who serves Prospero in Shakespeare's The Tempest) and is also known as Uranus I. It was discovered on Oct. 24, 1851, at the same time as Umbriel, ...
 See also: Uranus, Orbit, Ariel, Saturn, Earth
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