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Topic: Main belt

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	New Horizons Crosses The Asteroid Belt
		The first spacecraft to transit the asteroid belt was NASA's Pioneer 10, which made its epic crossing in 1972 on the way to the historic first encounter of a spacecraft with Jupiter.
		Fortunately, the asteroid belt is so huge that, despite its large population of small bodies, the chance of running into one is almost vanishingly small - far less than one in a billion.
		In addition to main belt asteroid flybys, NASA's NEAR and the Japanese Hayabusa mission both have made orbital rendezvous and landings on asteroids closer to Earth.
	www.spacedaily.com /reports/New_Horizons_Crosses_The_Asteroid_Belt.html (1740 words)

	Asteroid Facts - Explore the Cosmos \| The Planetary Society
		Main Belt: Most minor planets orbit the Sun in the main asteroid belt, a vast ring of hundreds of thousands of rocky objects circling between the orbits of Mars and Jupiter, from 2 to 4 AU from the Sun.
		In 2006, scientists reported that at least three bodies in the outer part of the main belt demonstrate classical cometary behavior, and defined a new class of bodies called the main belt comets.
		Many main belt asteroids may in fact contain a lot of ice, especially in the outer part of the belt; the line separating asteroids and comets is growing increasingly fuzzy.
	www.planetary.org /explore/topics/asteroids_and_comets/facts.html (1207 words)

	Belt Filters
		The friction between the surfaces is reduced by injecting water for lubrication and blowing air that floats the belt or by a moving floor constructed of narrow endless belts that move together with the main rubber belt.
		The repositioning of the box is one of the main reasons for loss of vacuum and special care must be taken to seal the box's anti-friction liners against the sacrificial wear belts and the bottom side of the main belt.
		The life of the belt and the main drive depend largely on the water lubrication between the surfaces of the moving and stationary parts hence, the tubes leading to those parts must be kept clean.
	www.solidliquid-separation.com /VacuumFilters/Belt/belt.htm (1707 words)

	Asteroid Belt - Crystalinks
		The asteroid belt is a region of the solar system falling roughly between the planets Mars and Jupiter where the greatest concentration of asteroid orbits can be found.It is termed the main belt when contrasted with other concentrations of minor planets, since these may also be termed asteroid belts.
		The inner border of the main belt is determined by the 4:1 orbital resonance with Jupiter at 2.06 AU which sends any bodies straying there onto unstable orbits.
		Asteroid belts are a staple of science fiction stories less concerned with realism than with drama, since they are frequently portrayed as being so dense that adventurous measures must be taken to avoid an impact.
	www.crystalinks.com /asteroidbelt.html (713 words)

	Pelican Technical Article: BMW Belt Replacement
		The belts are driven off of the crankshaft and power accessories such as the water pump, power steering pump, alternator and air conditioning compressor.
		With the poly-ribbed belts, this is the grooved surface.
		The belt should be able to be maneuvered around and through the fan - you do not need to remove the fan to swap out any of the belts (Figure 4).
	www.pelicanparts.com /bmw/techarticles/E36-Belt-Replacement/E36-Belt-Replacement.htm (966 words)

	Safety belt for motor vehicle - Patent 4098524
		Such types of belts all have numerous drawbacks, especially owing to the fact that the strap is doubled at the point where it can be unfastened, which condition frequently leads to its entanglement when the belt is not in service.
		Also belts equipped with a self-rolling device are practically impossible to be fitted in the rear of the vehicle because the self-rolling device must be situated in the same vertical line as the upper anchoring point, at a point where the embossing for the wheel passages prevents its installation.
		This belt comprises an auxiliary strap 8 constituted by a cable which is secured to the bottom of the body of the vehicle or to a side member of the frame thereof through the medium of a self-rolling device.
	www.freepatentsonline.com /4098524.html (1886 words)

	Main V-belt Drive (Site not responding. Last check: 2007-11-07)
		The RotorWay main power transmission mechanism from the engine to the secondary shaft is by means of eight "3V" section V-belts (3V-630), with each pair banded together into belted sets.
		Belts (and chains and pretty much everything else) stretch when a tension force is applied to them.
		The effective torsional rate of the belt drive is the applied torque divided by the angular deflection of the driving pulley caused by the belt stretch.
	www.epi-eng.com /RW-Vbelt.htm (663 words)

	Asteroid belt -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-11-07)
		It is termed the main belt when contrasted with other concentrations of (Any of numerous small celestial bodies composed of rock and metal that move around the sun (mainly between the orbits of Mars and Jupiter)) minor planets, since these may also be termed asteroid belts.
		It is believed that, during the first million years of the solar system history, planets formed by accretion of (One of many small solid celestial bodies thought to have existed at an early stage in the development of the solar system) planetesimals.
		Asteroid belts are a staple of (Literary fantasy involving the imagined impact of science on society) science fiction stories less concerned with realism than with drama, since they are always portrayed as being so dense that adventurous measures must be taken to avoid an impact.
	www.absoluteastronomy.com /encyclopedia/A/As/Asteroid_belt.htm (674 words)

	main asteroid belt
		The main asteroid belt extends from 2.15 to 3.3 astronomical units (255 to 600 million km) from the Sun –; between Mars (1.5 AU) and Jupiter (5.2 AU) – and may contain over a million objects bigger than 1 km across, the largest being Ceres (1,003 km), Pallas (608 km), and Vesta (538 km).
		Within the belt, the distribution of asteroids is non-uniform, with concentrations in asteroid groups and families, and also relatively empty zones known as Kirkwood gaps.
		The belt appears to have originated as a system of perhaps 50 large bodies in the 100 to 1,000 km size range.
	www.daviddarling.info /encyclopedia/M/mainasterbelt.html (246 words)

	Galway Lake Roteted Block, Landers, California, Earthquake
		The main rupture belt is intensely broken by a large number of vertical fractures, the traces of which are mostly parallel or oriented 10-20° clockwise with respect to the trend of the belt (fig.
		The fractures that are generally parallel to the trace of the main rupture are tension cracks, and those oriented clockwise from the trace of the rupture belt are right-lateral, strike-slip faults.
		In general, the fractures in the main belt are all contained within the broad shear zone that carries the bulk of the displacement along the Emerson fault zone.
	geomechanics.geol.pdx.edu /Papers/Landers/GSA-Mch082/index.html (13324 words)

	Asteroids
		Main Belt: located between Mars and Jupiter roughly 2 - 4 AU from the Sun; further divided into subgroups: Hungarias, Floras, Phocaea, Koronis, Eos, Themis, Cybeles and Hildas (which are named after the main asteroid in the group).
		Between the main concentrations of asteroids in the Main Belt are relatively empty regions known as the Kirkwood gaps.
		The composition of these objects is probably more like that of comets or the Kuiper Belt objects than that of ordinary asteroids.
	www.nineplanets.org /asteroids.html (1366 words)

	Clandestine comets found in main asteroid belt - space - 23 March 2006 - New Scientist Space (Site not responding. Last check: 2007-11-07)
		The orbits of the three known objects in a newly defined population of comets that lies within the asteroid belt are shown in red.
		David Jewitt and Henry Hsieh have dubbed the new population "main belt comets".
		The team believes in order to survive at such proximity to the Sun, the volatiles in the main belt comets would have to be covered by a layer of possibly carbonaceous material.
	space.newscientist.com /article.ns?id=dn8887 (733 words)

	Asteroids
		The main asteroid belt is defined as reaching from 2.2 to 3.3 AU (1 AU is the average distance of the Earth from the Sun).
		The main belt asteroids are believed to be the remnants of a planet which never formed.
		Collisions between asteroids in the main belt occur with an average velocity of 5 km/sec.
	www.pibburns.com /catastro/asteroid.htm (1656 words)

	AlphaGalileo.Org - the Internet-based news centre for European science, engineering and technology.
		Because it is impossible to simply point the telescope at the whole main belt and count, astronomers choose selected regions of the belt and then use a theoretical model to extrapolate the data to the whole belt.
		A better knowledge of the number and size distribution of asteroids in the main belt is essential to understand the population of Near Earth Asteroids (NEAs), since most NEA are believed to be former main belt asteroids.
		In the main belt there are four `special` regions where Jupiter`s gravitational influence is especially disruptive; originally, most asteroids currently known as NEA suffered collisions which resulted in them ending up in one of those four key regions, and because of Jupiter`s gravitational influence their orbits quickly evolved into Earth-crossing orbits.
	www.alphagalileo.org /index.cfm?fuseaction=readRelease&Releaseid=9162 (1103 words)

	Basics of Space Flight Section I. The Environment of Space
		Eight spacecraft have crossed the main asteroid belt en route to their destinations, as of January 2007: Pioneers 10 and 11, Voyagers 1 and 2, Ulysses, Galileo (crossed twice), Cassini, and New Horizons.
		The "main belt" asteroids can actually be categorized as divided into two belts, according to confirming data from the current Sloan Digital Sky Survey.
		The orbit of a Kuiper belt object is sometimes perturbed by gravitational interactions with the Jovian planets causing it to cross Neptune's orbit, where eventually it may have a close encounter with Neptune, either ejecting the comet or throwing it deeper into the solar system.
	www2.jpl.nasa.gov /basics/bsf1-3.html (1658 words)

	PSRD: Iron Meteorites as the Not-So-Distant Cousins of Earth (Site not responding. Last check: 2007-11-07)
		Over millions of years, a small fraction of this differentiated debris was scattered into the innermost region of the main belt, where it then stayed for billions of years until chance collisional and dynamical events sent it on a crash course to Earth.
		Bottke and colleagues' prediction of these asteroid main belt gatecrashers could mean that some of the iron meteorites we hold in our hands today are pieces of the same precursor fabric that formed the Earth and other terrestrial planets.
		While some main belt asteroids do look like fragments from differentiated bodies, the total number is relatively small when compared to our expectations based on the iron meteorite record.
	www.psrd.hawaii.edu /July06/asteroidGatecrashers.html (2812 words)

	ESA Portal - New study reveals twice as many asteroids as previously believed
		Because it is impossible to simply point the telescope at the whole main belt and count, astronomers choose selected regions of the belt and then use a theoretical model to extrapolate the data to the whole belt.
		They found that in the middle region of the belt the density of asteroids was 160 asteroids larger than one kilometre per square degree - an area of the sky corresponding to that covered by four full moons as seen from Earth.
		In the main belt there are four 'special' regions where Jupiter's gravitational influence is especially disruptive; originally, most asteroids currently known as an NEA suffered collisions which resulted in them ending up in one of those four key regions, and because of Jupiter's gravitational influence their orbits quickly evolved into Earth-crossing orbits.
	www.esa.int /export/esaCP/ESAASPF18ZC_index_0.html (1130 words)

	Asteroids
		Main Belt: located between Mars and Jupiter roughly 2 - 4 AU from the Sun; further divided into subgroups: Hungarias, Floras, Phocaea, Koronis, Eos, Themis, Cybeles and Hildas (which are named after the main asteroid in the group).
		Between the main concentrations of asteroids in the Main Belt are relatively empty regions known as the Kirkwood gaps.
		The composition of these objects is probably more like that of comets or the Kuiper Belt objects than that of ordinary asteroids.
	seds.lpl.arizona.edu /nineplanets/nineplanets/asteroids.html (1354 words)

	Long-term Evolution of the Zodiacal Cloud (Site not responding. Last check: 2007-11-07)
		The history of the zodiacal dust cloud over the age of the solar system is likely to have been closely connected to the history of the main asteroid belt.
		The fact that this is significantly longer than the age of the system means that the evolution of the population is not "controlled" by mutual interactions but by something external, i.e.
		The winnowing of the asteroid belt is not just by collisions but also by planetary perturbations, so it is "chaotic" and the density of the asteroid belt and associated zodiacal cloud cannot be easily derived for past epochs.
	astrobiology.arc.nasa.gov /workshops/1997/zodiac/backman/IIIc.html (336 words)

	ESA Science & Technology: New study reveals twice as many asteroids as previously believed
		They found that in the middle region of the belt the density of asteroids was 160 asteroids larger than 1 kilometre per square degree - an area of the sky corresponding to that covered by four full moons as seen from Earth.
		A better knowledge of the number and size distribution of asteroids in the main belt is essential to understand the population of Near Earth Asteroids (NEAs), since most NEA are believed to be former main belt asteroids.
		In the main belt there are four 'special' regions where Jupiter's gravitational influence is especially disruptive; originally, most asteroids currently known as NEA suffered collisions which resulted in them ending up in one of those four key regions, and because of Jupiter's gravitational influence their orbits quickly evolved into Earth-crossing orbits.
	sci.esa.int /science-e/www/object/index.cfm?fobjectid=29762 (1111 words)

	The Red Kaganate - Khazar Belt
		The main photograph was taken by Alexander Lemeshko at the Hermitage Museum, St. Petersburg.
		At a guess, these three "double bird" plates were used as the main belt supports of pendant straps.
		This strap end is too narrow to match with these bird plates but seems to be a good match in both size and decoration for the four small round plates at the left of the full display.
	www.geocities.com /normanjfin/belts/unkbelt.html (363 words)

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