- Roche limit
/rohsh/; Fr. /rddawsh/, Astron.the minimum distance below which a moon orbiting a celestial body would be disrupted by tidal forces or below which a moon would not have formed.[1885-90; named after French astronomer Édouard Roche (1820-83), who first calculated it]
* * *Minimum distance at which a large natural satellite can orbit its primary body without being torn apart by tidal forces.If satellite and primary are of similar composition, the theoretical limit is about 2.5 times the radius of the larger body. The rings of Saturn, for example, lie inside Saturn's Roche limit and may be the debris of a demolished moon. The limit was first calculated by the French astronomer Édouard Roche (1820–53) in 1850.
* * *in astronomy, the minimum distance to which a large satellite can approach its primary body without being torn apart by tidal (tidal friction) forces. If satellite and primary are of similar composition, the theoretical limit is about 2 1/2 times the radius of the larger body. 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 Édouard Roche (1820–83). Artificial satellites are too small to develop substantial tidal stresses.
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Roche limit — [rōsh] n. [after E. Roche (1820 83), Fr astronomer] the lowest possible altitude at which a natural satellite can form and orbit, withstanding the fragmenting force of the gravitational pull of a planet or other primary celestial body: see also… … English World dictionary
Roche limit — If the primary is less than half as dense as the satellite, the rigid body Roche Limit is less than the primary s radius, and the two bodies may collide before the Roche limit is reached.How close are the solar system s moons to their Roche… … Wikipedia
roche limit — ˈrȯsh , ˈrōsh noun or roche s limit shə̇z Usage: usually capitalized R Etymology: after E. A. Roche died 1833 French mathematician : the distance between a planet s center and its satellite within which the satellite cannot approach without… … Useful english dictionary
Roche limit — noun Etymology: E. A. Roche died 1883 French mathematician Date: 1889 the distance from a planet s center within which a satellite can neither approach nor reside without becoming disrupted by tidal forces … New Collegiate Dictionary
Roche limit — noun the closest distance which a satellite can approach its parent body without being pulled apart by tidal forces … Wiktionary
Roche Limit — The minimum distance a satellite can orbit its parent planet without having tidal forces tear it apart … The writer's dictionary of science fiction, fantasy, horror and mythology
Roche lobe — Roche lobe, a gaseous bulge formed in binary stars by each star s gravitational pull on the other. ╂[< E. Roche; see etym. of Roche limit (Cf. ↑Roche limit)] * * * n. Astronomy either of two lobes that form an hourglass shaped volume of space… … Useful english dictionary
Roche — is French for boulder/rock . The word is (part of) several names: Business companies* Roche Applied Science, a business area of Roche Diagnostics, a division of Hoffmann–La Roche AG, Basel, Switzerland, one of the largest pharmaceutical companies … Wikipedia
Roche lobe — The Roche lobe is the region of space around a star in a binary system within which orbiting material is gravitationally bound to that star. If the star expands past its Roche lobe, then the material outside of the lobe will fall into the other… … Wikipedia
roche's limit — noun see roche limit * * * Roche s limit «R shihz, ROH », = Roche limit. (Cf. ↑Roche limit) … Useful english dictionary