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Topic: Roche limit

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Roche lobe

Tidal force

Tidal locking

Spaghettification

Lagrangian point

Barycenter

Occultation

1849 in science

The Integral Trees

Orbital resonance

Phobos (moon)

Black hole

Tidal resonance

Jupiter (planet)

	Roche limit - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-10-21)
		Closer to the Roche limit the body is deformed by tidal forces.
		The Roche limit, sometimes referred to as the Roche radius, is the distance within which a celestial body held together only by its own gravity will disintegrate due to a second celestial body's tidal forces exceeding the first body's gravitational self-attraction.
		To calculate the rigid body Roche limit for a spherical satellite, the cause of the rigidity is neglected but the body is assumed to maintain its spherical shape while being held together only by its own self-gravity.
	www.knowledgehunter.info /wiki/Roche_limit (1314 words)

	Roche Limit: Why Do Comets Break Up?
		Earth’s Roche limit for comets is 34,700 km or 5.43 radii and for asteroids, 19,000 km or 2.98 radii.
		Jupiter’s limit for comets is 242,000 km or 3.38 radii and for asteroids is 133,000 km or 1.86 radii.
		Saturn’s limit for comets is 164.000 km or 2.72 radii and for asteroids is 90.200 km or 1.50 radii.
	www.asterism.org /tutorials/tut25-1.htm (742 words)

	Talk:Roche limit - Wikipedia, the free encyclopedia
		Throughout the Roche limit discussion, capital letter variable definitions refer to the rigid primary, while lowercase letters refer to the satellite.
		The table in the Roche limits for selected examples section showing where various solar system bodies are relative to their roche limits mixes ratios and percentages.
		The bad news is that they often get inside the Roche limit or outside the Hill sphere before they reach stability, and therefore stop being a moon altogether.
	en.wikipedia.org /wiki/Talk:Roche_limit (1465 words)

	Roche limit - Wikipedia, the free encyclopedia
		Closer to the Roche limit the body is deformed by tidal forces.
		The Roche limit is the distance within which a celestial body held together only by its own gravity will disintegrate due to a second celestial body's tidal forces exceeding the first body's gravitational self-attraction.
		The Roche limit should not be confused with the concept of the Roche lobe, which is also named after Édouard Roche.
	en.wikipedia.org /wiki/Roche_limit (1311 words)

	Gillespie Papers Project // Viewzone
		Roche's Limit or Roche's Radius is the distance from a planet inside which a satellite will be torn apart by tidal forces.
		All of the ring systems are inside Roche's Limit, which is the distance from a planet at which the planet's tidal force on a satellite (force that stretches apart) is equal to the satellite's self-gravity (force that holds it together).
		Satellites closer than Roche's limit will experience stronger tidal force, and since the self-gravity is the same regardless of distance from the planet, tidal force will dominate, and keep an object from forming, or break an already-formed object held together by self- gravity into fragments.
	www.viewzone.com /paper02.html (617 words)

	Roche limit
		(For the Moon, whose density is lower than that of Earth, the Roche limit would be 2.9 Earth radii.) In practice, since moons tend to be solid, the tensile force of the rock and ice of which they are composed helps prevent their breakup.
		Even so, the shattering of satellites in orbits well inside the Roche limit may explain the origin of some planetary ring systems.
		The limit is named after the French mathematician Édouard Roche (1820-1883) who first described the theory behind it.
	www.daviddarling.info /encyclopedia/R/Rochelimit.html (211 words)

	Roche Limit
		The Roche limit is the minimum distance to which a large satellite can approach its primary body without being torn apart by tidal forces.
		The rings of Saturn lie inside Saturn's Roche limit and may be the debris of a demolished moon.
		The limit was first calculated by the French astronomer douard Roche (1820-83).
	abyss.uoregon.edu /~js/glossary/roche_limit.html (86 words)

	Roche Diagnostics - Careers - Your Financial Security
		Roche Diagnostic recognizes that benefits are a valuable component of our total compensation package and we continually review the plans, services, and coverage to ensure we provide our people with a comprehensive, competitive package.
		Roche offers a comprehensive life insurance program, including both employer-paid plans and voluntary, employee-paid programs from which you can choose to participate to supplement your insurance needs.
		Roche continues to pay 100% of your base salary for up to 90 days of disability, at no cost to you.
	www.roche-diagnostics.us /financial.html (568 words)

	The Solar System Encyclopaedia — R
		It is interesting to note that the rings of the gas giants are within the Roche limit of the planet and those zones are devoid of any moons (except maybe for the tiny ones closest to the planet...).
		– is the radius of the Roche limit
		The Roche Limit is not just a theory, as has been proved when →comet →Shoemaker-Levy 9 was shattered by Jupiter's tides!
	ksiezyce.republika.pl /encyclopaedia/r_en.html (339 words)

	Roche limit -- Encyclopædia Britannica
		The rings of Saturn lie inside Saturn's Roche limit and may be the debris of a demolished moon.
		In partnership with Martin Roche, William Holabird designed commercial buildings that exemplify the Chicago school of architecture and are landmarks in the development of the skyscraper.
		Roche uses the "attic" to play with notions of memory and tradition (both public and private) and to comment on the evolution of time and society and how it affects context.
	www.britannica.com /eb/article-9063949?tocId=9063949 (844 words)

	Roche hands over flu drug to China - The Boston Globe
		Swiss drug maker Roche said yesterday it had stopped selling the antiviral drug Tamiflu in China and was turning over supplies to the government as local officials were ordered to prepare to treat possible human cases of bird flu.
		BEIJING -- Swiss drug maker Roche said yesterday it had stopped selling the antiviral drug Tamiflu in China and was turning over supplies to the government as local officials were ordered to prepare to treat possible human cases of bird flu.
		Concerns that private suppliers might be hoarding Tamiflu have prompted Roche to limit sales in other countries, including the United States, Switzerland, Germany, and Canada.
	www.boston.com /business/healthcare/articles/2005/11/09/roche_hands_over_flu_drug_to_china (403 words)

	Sauropods, Elephants, Weightlifters: Mechanism
		The Roche limit is named for a physicist who worked out how much tide a planet can stand before it is destroyed.
		Using a workable approximation for computing this limit (that is, for bodies of equal density, the Roche Limit is 2.44 times the radius of the larger), we find that tides of approximately 0.14g on earth would completely destroy it.
		In fact, even if gravity were reduced to zero at the sub-saturn point (which is already impossible due to the roche limit, but go with it for a moment), it would not be adequate for Ted's theory about 20 or 30 degrees away.
	www.talkorigins.org /faqs/sauropods/sauropods-mechanism.html (792 words)

	Roche U.S. Pharmaceuticals : Health Care Programs and Services : Order Management Policies (Site not responding. Last check: 2007-10-21)
		ROCHE retains the right to waive drop ship charges when drop shipments are the result of special programs or conditions beyond the Direct Customer's control.
		ROCHE agrees to fairly enforce the ROCHE buying limit policy by monitoring the amount of ROCHE products that can be purchased by any one Direct Customer in any given month to ensure that ROCHE can meet the needs of all of its customers when demand for products is particularly high.
		Roche further reserves the right to request proof of purchase in the form of an invoice that identifies the name of the supplier, which is (or was at time of purchase) an authorized distributor of record of Roche, and the quantity and date of the purchase.
	www.rocheusa.com /programs/order_mgt.html (1566 words)

	Roche Limit - Stage.FM
		Roche Limit is Electronic, Folk and Pop carefully blended together in a musical cocktail that is original, fresh, and constantly keeping you guessing where it will take you next.
		Roche Limit’s debut album entitled “White Light” is another stunning example of why Canadian independent music continues to gain more and more recognition.
		The listener is transported from the depths of a brooding instrumental to unforgettable upbeat melodies, all the while maintaining the unique and refreshing sound that is Roche Limit.
	www.stage.fm /Rochelimit (471 words)

	Orcas men win $6,500 in Roche Harbor salmon derby - Roche Harbor Village first Annual Salmon Classic Invitational (Site not responding. Last check: 2007-10-21)
		With a limited entry of 100 boats, and up to four anglers per boat -- including the skipper, there are less than 50 entries left open for the upcoming annual Roche Harbor Salmon Classic Invitational fishing derby, scheduled for February 3, 4 and 5, 2005.
		Roche Harbor also takes great pleasure to be named one of eight derbies in the Northwest Salmon Derby Series, produced by the Northwest Marine Trade Association.
		Roche Harbor's second annual Salmon Classic Invitational Fishing Derby is scheduled for February 3, 4 and 5, 2005.
	www.sanjuanislander.com /events/competition/derby-2004-final.shtml (1079 words)

	Roche limit — FactMonster.com
		Roche limit, the closest distance that a celestial body held together only by its own gravity can come to a planet without being pulled apart by the planet's tidal (gravitational) force.
		Some satellites, both natural and artificial, can orbit within their Roche limits because they are held together by forces other than gravitation.
		All known planetary rings are located within the Roche limit, and may be either remnants from the planet's protoplanetary accretion disc that did not amalgamate into satellites or fragments from a body passed within its Roche limit and broke apart.
	www.factmonster.com /ce6/sci/A0933024.html (277 words)

	Mars' Moons
		Edouard Roche (1820-1883) developed a formula called the "Roche Limit," which is the radial limit of how close a body can come to another before it will be destroyed due to the difference in the forces across it.
		For Mars-Phobos, the Roche Limit is estimated as 10,800 km.
		This is because the Roche Limit does not take into account the strength of the material of the object.
	filer.case.edu /~sjr16/advanced/mars_moons.html (592 words)

	Roche U.S. Pharmaceuticals : Healthcare Programs and Services : Patient Assistance Program
		Roche is a pioneer in providing our drugs, free, to patients who lack prescription coverage and the means to pay for the medications they need.
		In fact, the Roche Patient Assistance Program was one of the first in the industry, setting the standard for assisting patients in need since the early 1960´s.
		Roche does not charge a co-payment and does not limit the time a patient may receive free drug.
	www.rocheusa.com /programs/patientassist.asp (244 words)

	Cassini-Huygens: FAQ
		A moon might have been shattered by meteor impacts, and its debris might have moved to within the Roche limit, where it was unable to reunite into a large body.
		The Roche limit is the minimum distance that a moon (or other large object) can be from a planet without being torn to bits.
		The ring particles may be material that was left over from this process, or they may be the remnants of a moon that was shattered by collision or by tidal forces (see Roche limit).
	saturn.jpl.nasa.gov /faq/saturn.cfm (1665 words)

	The Origin of the Moon: The Movie (Site not responding. Last check: 2007-10-21)
		We investigate the evolution of a circumterrestrial disk of debris generated by a giant impact on the earth and the characteristics of the moon accreted from the disk by using high-resolution N-body simulation.
		Particles are transfered to the outside of the Roche limit due to the gravitational torque exerted by the spiral arms.
		When a spiral arm is extended beyond the Roche limit, the tip of the spiral arm collapses to form a small moonlet.
	yso.mtk.nao.ac.jp /~kokubo/moon/kit/movie.html (396 words)

	limit - Search Results - ninemsn Encarta (Site not responding. Last check: 2007-10-21)
		Calculus, branch of mathematics concerned with rates of change, gradients of curves, maximum and minimum values of functions, and the calculation of...
		Chandrasekhar Limit, upper limit to the mass that a white dwarf star can have, about 1.4 times the mass of the Sun.
		Roche Limit, minimum distance that a moon can exist in orbit around a planet without being torn apart by tidal forces raised by the planet's...
	au.encarta.msn.com /limit.html (161 words)

	Rings of the Giant Planets
		The roche limit (or roche zone or Tidal Zone) is the region within 2 - 3 planetary radii (any planet) where the tidal forces tugging on an object become comparable to its gravitational forces that are holding it together.
		An object, such as an asteroid (basically a rocky rubble pile) or a comet (an icy rubble pile) that ventures within the roche limit does not have enough gravitational pull among the particles to keep itself together.
		Since all rings lie withing the roche limit of the planet, the moons are going to be so small that the tidal forces they feel are not great enough to pull them apart.
	www.astro.washington.edu /larson/Astro150b/Lectures/Rings/rocks_rings.html (1016 words)

	ASTRONOMY 101- LECTURE 39 (Site not responding. Last check: 2007-10-21)
		Roche Limit or tidal stability limit: Larger satellites (more than a few tens of km in size) are held together by their own gravity --each bit of satellite pulls on each other bit.
		The more massive the planet, the larger the Roche limit, and the larger the region within which large moons cannot form and cannot exist.
		Rings may be transient, temporary phenomena-- a satellite or comet may come within the Roche limit and break up, forming a ring that lasts only temporarily.
	www.gettysburg.edu /academics/physics/clea/A101ol39.html (1069 words)

	Physics Help and Math Help - Physics Forums - View Single Post - Roche limits with a hint of internal bonds.
		Thread: Roche limits with a hint of internal bonds.
		Roche limits with a hint of internal bonds.
		I have created a program that plots the orbit of a comet around our sun, as it orbits, a ratio between internal binding forces and tidal forces is calculated (this produces a Roche limit).
	www.physicsforums.com /showpost.php?p=401028&postcount=1 (260 words)

	Mars Main Index/Science/Geological History/Moons of Mars (Site not responding. Last check: 2007-10-21)
		When fragments circle the sun and impact each other, forming into planet-sized objects, the process is called "accretion." According to Newton’s laws of gravity, as the new planet-sized objects grew to a certain mass they would attract their own rings of debris and fragments (much like the rings of Saturn today).
		Roche's Limit is the distance from a planet inside which a satellite will be torn apart by tidal forces.
		That is, Roche's Limit is the distance from a planet at which the planet's tidal force on a satellite (force which stretches apart) is equal to the satellite's self-gravity (force which holds it together).
	calspace.ucsd.edu /marsnow/library/science/geological_history/moons1.html (2308 words)

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