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Topic: Uranus natural satellites

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	Wikinfo \| Uranus (planet)
		Uranus is composed primarily of rock and various ices, with only about 15% hydrogen and a little helium (in contrast to Jupiter and Saturn which are mostly hydrogen).
		Uranus' cyan color is due to the adsorption of red light by atmospheric methane.
		Uranus' magnetic field is odd in that it is not centered on the center of the planet and is tilted almost 60° with respect to the axis of rotation.
	www.wikinfo.org /wiki.php?title=Uranus_(planet) (793 words)

	MSN Encarta - Natural Satellite
		The motion of most of the solar system's natural satellites about their planets is direct: west to east, in the same direction as the rotation of their planets.
		Several small satellites of the large outer planets, however, revolve in the retrograde direction: east to west, opposite the direction of the rotation of their planets.
		These retrograde satellites tend to orbit far from their primaries and were probably captured by the planets' gravitational fields some time after the formation of the solar system.
	encarta.msn.com /encyclopedia_761551602/Natural_Satellite.html (389 words)

	Uranus' natural satellites - Wikipedia, the free encyclopedia
		The flyby of the Voyager 2 space probe in January 1986 led to the discovery of a further 10 moons, and another satellite Perdita was later found after studying old Voyager photographs.
		Unlike most planetary moons, which are named from antiquity, all the moons of Uranus are named after characters from the works of Shakespeare and Alexander Pope.
		These sources give no information on the masses for the small satellites; some data have changed greatly so it is unlikely that these old values are correct.
	en.wikipedia.org /wiki/Uranus'_natural_satellites (325 words)

	The Library - Astronomy - Uranus
		Uranus was discovered in 1781 by astronomer William Herschel, who at first believed it to be a comet.
		Uranus' magnetic field is unusual in that the magnetic axis is tilted 60 degrees from the planet's axis of rotation and is offset from the center of the planet by one-third of the planet's radius.
		Uranus is so far from the Sun that, even though tipped on its side and experiencing seasons that last over twenty years, the temperature differences on the summer and winter sides of the planet do not differ that greatly.
	www.lunaroutpost.com /library/uranus.htm (501 words)

	MSN Encarta - Natural Satellite
		Natural satellites that orbit planets are often called moons.
		Jupiter has more than 30 natural satellites, four of which are quite large: Io, Ganymede, Callisto, and Europa.
		Uranus has more than 20 moons, none of which are nearly as large as Earth’s Moon.
	ca.encarta.msn.com /encyclopedia_761551602/Natural_Satellite.html (389 words)

	AllRefer.com - Uranus, in astronomy (Astronomy, General) - Encyclopedia
		Because the calculated orbit of Uranus did not compare accurately with the observed orbit, astronomers concluded that a disturbing influence was present.
		Uranus has a diameter of c.31,760 mi (46,700 km), roughly 4 times that of the earth, and a mass of about 15 times that of the earth.
		Prior to 1986, only five of Uranus's natural satellites were known: Titania, the largest, and Oberon were discovered by Herschel in 1787; Ariel and Umbriel, by William Lassell in 1851; and Miranda, by Gerard Kuiper in 1948.
	reference.allrefer.com /encyclopedia/U/Uranus1.html (608 words)

	World Almanac for Kids
		Uranus was accidentally discovered in 1781 by the British astronomer Sir William Herschel and was originally named the Georgium Sidus (Star of George) in honor of his royal patron King George III of Great Britain.
		Uranus has an equatorial radius of 25,559 km (15,882 mi), and its average distance from the sun is 2,870,972,200 km (1,783,939,400 mi).
		Uranus takes 84.02 earth years for a single revolution, or orbit, around the sun and 17.24 hr to complete a rotation about its axis; the direction of rotation is retrograde (opposite to that of earth).
	www.worldalmanacforkids.com /explore/space/uranus.html (465 words)

	Tour of the Solar System: Uranus
		According to myth, Uranus was the son and mate of Gaia the father of Cronus (Saturn) and of the Cyclopes and Titans.
		Uranus is different from any other planet in the solar system in that its axis of rotation is tilted 98 degrees.
		Uranus is the third of the gas giants from the Sun.
	www.seasky.org /solarsystem/sky3h1.html (694 words)

	Satellites (from Uranus) -- Britannica Concise Encyclopedia - The online encyclopedia you can trust!
		The 10 minor satellites, all of which were discovered by Voyager 2, have radii from 13 to 77 km and orbit the planet at distances ranging from 49,750 to 86,000 km.
		The four largest satellites, Ariel, Umbriel, Titania, and Oberon, have densities that range from 1.5 to 1.7 grams per cubic centimetre, which is slightly greater than the density of a hypothetical satellite that is 60 percent ice and 40 percent rock.
		The rupturing of the crust was caused by an expansion in the volume of the satellites, inferred to be in the range of 1 to 2 percent, except for Miranda, for which the expansions are 6 percent.
	www.britannica.com /ebc/article-54294 (1600 words)

	The Columbia Encyclopedia, Sixth Edition: Uranus @ HighBeam Research (Site not responding. Last check: 2007-10-12)
		URANUS [Uranus], 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.
		Trinculo, a small irregular satellite, was discovered in 2002; seven other small satellites are also irregular, that is, their motion around Uranus is retrograde (motion opposite to that of the planet's rotation).
		In 1977, during an occultation by Uranus of a star, astronomers detected a system of nine narrow rings of small, dark particles orbiting around the planet; two more rings, many tiny ringlets, and arcs of rings were later found by Voyager 2.
	www.highbeam.com /library/doc0.asp?DOCID=1E1:Uranus1&refid=ip_encyclopedia_hf (656 words)

	Space Today Online - Solar System - Planet Uranus - Moons
		Uranus' rings may be young remnants of a shattered moon.
		Uranus was known to have ten so-called "regular" natural satellites that follow orderly paths around the planet all in about the same plane.
		The irregulars were seen to be traveling in odd orbits around Uranus and may be remnants of a massive ancient collision between a comet and some other large object that had been orbiting Uranus.
	www.spacetoday.org /SolSys/Uranus/UranusMoons.html (1380 words)

	The Planet Uranus: FactShack.com (Site not responding. Last check: 2007-10-12)
		The name Uranus, which was first proposed by the German astronomer Johann Elert Bode (1747–1826), was in use by the late 19th century.
		Uranus has a diameter of 52,200 km (32,500 mi), and its mean distance from the sun is 2.87 billion km (1.78 billion mi).
		Uranus takes 84.01 earth years for a single revolution, or orbit, and 17 hr 14 min for a complete rotation about its axis, which is inclined 98° to the plane of the planet’s orbit around the sun.
	www.factshack.com /space/uranus.html (541 words)

	BBC News \| SCI/TECH \| Distant planet is blue and beautiful
		Uranus is a gas-giant world that is difficult to study from the Earth even with the largest telescopes.
		The planet itself, its ring system, and two of its satellites, Miranda (top) and Ariel (bottom-left), were imaged by the telescope's Coronagraphic Imager as part of its programme of commissioning.
		Uranus was discovered on 13 March, 1781, by William Herschel.
	news.bbc.co.uk /hi/english/sci/tech/newsid_1874000/1874663.stm (336 words)

	Timeline of natural satellites (Site not responding. Last check: 2007-10-12)
		For comparison, discovery dates of Uranus, Neptune and Pluto are also included, as well as the first six asteroids.
		Historically the naming of natural satellites did not always match the times of their discovery.
		Uranus XX Gladman, Holman, Kavelaars, Petit, Scholl [1]
	hallencyclopedia.com /Timeline_of_natural_satellites (634 words)

	Hypothetical Planets
		Lagrange in 1761 (Lagrange announced that the orbital plane of the satellite was perpendicular to the ecliptic).
		It was hoped that the satellite could be seen during the transit of Venus in front of the Sun June 1 1777 (it is self evident that Lambert made a mistake in calculating these orbital elements: at 66.5 Venus radii, the distance from Venus is about the same as our Moon's distance from the Earth.
		The method to search for such natural satellites was developed by Clyde Tombaugh: the motion of a satellite at e.g.
	www.seds.org /billa/tnp/hypo.html (9089 words)

	Space Today Online - Solar System - Planet Uranus
		Uranus is larger in diameter, yet smaller in mass than the planet Neptune.
		Uranus was the god of the heavens in ancient Greek mythology.
		After passing Uranus, Voyager 2 sailed on toward a rendezvous within 3,000 miles of the planet Neptune in August 1989.
	www.spacetoday.org /SolSys/Uranus/UranusPlanet.html (996 words)

	Encyclopedia: Natural satellite (Site not responding. Last check: 2007-10-12)
		The common noun moon (not capitalized) is used to mean any natural satellite of the other planets.
		A satellite is an object that orbits another object (known as its primary).
		The goal in sharing these images is to help people visualize where and when natural hazards occur, and to help mitigate their effects.
	www.nationmaster.com /encyclopedia/natural-satellite (558 words)

	[No title]
		The size of each satellite is shown by a circle whose size is proportional to the diameter of the object in the ratio 1:1000 to the horizontal scale on the plot.
		The lack of irregular satellites near inclinations of 90 degrees is believed to be due to the effect of the Kozai resonance, but may also occur due to the mechanism involved in the satellites' origin.
		The lack of irregular satellites at Neptune (other than Nereid), if observationally confirmed, may have resulted from the gravitational effect of its massive satellite Triton, which is believed to have been captured onto an initially eccentric orbit and may have ejected many pre-existing irregular satellites before tides circularized its orbit.
	www.boulder.swri.edu /~davidn/satellite/satellite.html (445 words)

	How many satellites does each planet have? (Site not responding. Last check: 2007-10-12)
		The only other inner planet with natural satellites is the planet Mars, which has two, named Phobos and Deimos.
		Saturn is presently known to have eighteen natural satellites, with the possibility of several others which have yet to be confirmed.
		Uranus is known to have at least fifteen natural satellites while Neptune has at least eight natural satellites, including the most famous named Triton.
	collections.ic.gc.ca /universe/planets_answers06.html (123 words)

	[No title]
		Today, the planets with the most known natural satellites are Saturn with 30 moons, Jupiter with 27, Uranus with 21 and Neptune with 8.
		The existence of satellite families implies there are substantial unseen populations of smaller bodies around all of the giant planets, because collisions that chip 1-km fragments off 10-km moons occur far more frequently than ones that produce 10-km fragments from 100-km moons.
		The 12 new satellites discovered by Gladman et al.1 can be grouped into families according to their orbital properties: cyan and green objects are the new prograde groups whereas magenta and red dots (including previously-known Phoebe) are all retrograde satellites.
	www.astro.umd.edu /~hamilton/research/preprints/Ham01.txt (1258 words)

	Jet Propulsion Laboratory: Planets
		Uranus, the third largest planet in our solar system, may be the strangest because it spins on its side.
		The only spacecraft to visit Uranus, Voyager 2, saw few features in the planet's atmosphere when it flew by in 1986.
		Moons of Uranus have been named for characters in the works of William Shakespeare and Alexander Pope.
	www.jpl.nasa.gov /solar_system/planets/uranus_index.html (191 words)

	Astronomical naming conventions - Gurupedia
		Natural satellites of other planets are generally named after mythological figures.
		Satellites of Uranus are named after characters from William Shakespeare or Alexander Pope.
		When satellites are first discovered, they are given provisional designations such as "S/2000 J11" (the 11th new satellite of Jupiter discovered in 2000) or "S/2003 S1" (the 1st new satellite of Saturn discovered in 2003).
	www.gurupedia.com /a/as/astronomical_naming_conventions.htm (2197 words)

	Uranus Facts
		Uranus is the only planet called by a Greek name rather than a Roman name, however, most of the moons of the various planets are named from Greek mythology.
		Observations of Uranus taken in Chile in August, 2002, with the 4-meter Cerro Tololo Interamerican Observatory Blanco telescope have revealed a probable new moon for Uranus.
		All of the planets' natural satellites seem to be about 50% water ice, 30% rock, and 20% carbon and nitrogen materials.
	www.kidscosmos.org /kid-stuff/uranus-facts.html (448 words)

	StarChild: The planet Uranus
		Uranus is a large, plain, blue-green planet which can only be seen from the Earth with the unaided eye on a clear, dark night.
		The rapid spin of Uranus influences the winds in the atmosphere.
		Uranus has 21 known natural satellites (and may have at least 27), both within the rings and outside of the rings.
	starchild.gsfc.nasa.gov /docs/StarChild/solar_system_level2/uranus.html (261 words)

	Uranus, in astronomy
		Uranus, 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.
		found that Uranus has the most inclined magnetic field in the solar system, and some astronomers interpret this as evidence that the magnetic field is reversing its polarity.
		In 1977, during an occultation by Uranus of a star, astronomers detected a system of nine narrow rings of small, dark particles orbiting around the planet; two more rings, many tiny ringlets, and arcs of rings were later found by
	www.factmonster.com /ce6/sci/A0850165.html (602 words)

	Uranus
		Uranus rotates in 17 hours, and has the strangest rotation of any planet.
		Uranus was pole-on to the Sun when Voyager visited it in 1986.
		Uranus is covered by a thick blue haze that makes it nearly featureless as seen from Earth or even from Voyager.
	www.uwgb.edu /dutchs/planets/uranus.htm (539 words)

	Research Paper (Site not responding. Last check: 2007-10-12)
		Internet over the satellite is a fast growing business, it provides large bandwidth, and can be delivered anywhere in the world at a low cost to the company.
		A satellite in the latter orbit is called a synchronous satellite; if such a satellite orbits in the equatorial plane, it is termed geostationary because it will remain at the same point above the Earth's surface.
		Satellites are designed to meet specific needs, for instance a weather satellite will have cameras for taking pictures of cloud formations, and a communication satellite will have an antenna array for receiving data from the earth.
	iris.nyit.edu /~mbruno/techwriting/new_page_5.htm (834 words)

	Spaceflight Now \| Breaking News \| Hubble shows the colorful lives of the outer planets
		Uranus and Neptune aren't the identical egg-blue twins they appear to be in natural color, according to NASA Hubble Space Telescope images released today.
		Uranus shows greater contrast between its hemispheres, which may be caused by its extreme seasons.
		Uranus' faint rings and several of its satellites are visible in a wider view of Uranus.
	spaceflightnow.com /news/n0401/22outerplanets (1071 words)

	The Similarities of the Planets (and Other Celestial Objects)
		Like Uranus, the offset field of Neptune is not typical of dynamo theory, and is, therefore, "unexplained." These facts alone suggest that a Field-dynamical Model is responsible for the observations.
		The similarity in the meridional structure of temperature and thermal winds on Neptune and Uranus was unexpected." This is in spite of the differences in solar heating, which is greater in the equatorial region of Neptune and the polar region of Uranus.
		Satellites produce turning forces (torques) that tend to confine a ring, but also transfer so much energy that confinement is impossible.
	www.livingcosmos.com /celestial.htm (11286 words)

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