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Topic: Asteroid group

	Minor planet - Wikipedia, the free encyclopedia
		Arjuna asteroids are somewhat vaguely defined as having orbits similar to Earth's; i.e., with an average orbital radius of around 1 AU and with low eccentricity and inclination.
		Alinda asteroids have a mean orbital radius of 2.5 AU and an eccentricity between 0.4 and 0.65 (approximately).
		Pallas family asteroids have a mean orbital radius between 2.7 and 2.8 AU and an inclination between 30° and 38°.
	en.wikipedia.org /wiki/Asteroid_group (2522 words)

	asteroid
		Most asteroids move in orbits that are somewhat more inclined and eccentric than those of the major planets (with the exception of Pluto) – the orbit of an average main-belt asteroid being inclined at about 10° to the plane of the ecliptic with an eccentricity of about 0.15.
		Following its discovery, an asteroid is given a preliminary designation that consists of the year of discovery, an upper case letter to indicate the half-month in that year (A=Jan 1-15, B=Jan 16-31,..., Y=Dec 16-31, the letter “I” being omitted), and a second upper case letter in sequence.
		The distribution of the various classes throughout the asteroid belt is highly structured, suggesting that many asteroids formed at or near their present distances from the Sun and are representative of the composition of the solar nebula (not including hydrogen and helium) at these locations.
	www.daviddarling.info /encyclopedia/A/asteroid.html (1791 words)

	Solar system
		Asteroid s are objects smaller than planets that lie roughly within the orbit of Jupiter and are composed in significant part of nonvolatile minerals.
		They are subdivided into asteroid group s and asteroid families based on their specific orbital characteristics.
		Asteroid moon s are asteroids that orbit larger asteroids.
	www.nebulasearch.com /encyclopedia/article/Solar_system.html (1357 words)

	NASA - Asteroid
		It is one of thousands of asteroids in the asteroid belt, a region between the orbits of Mars and Jupiter.
		The average temperature of the surface of a typical asteroid is -100 degrees F (-73 degrees C).
		Asteroids in the second group, which are located in the inner part of the belt, are rich in minerals.
	www.nasa.gov /worldbook/asteroid_worldbook.html (975 words)

	Asteroidea (Site not responding. Last check: 2007-10-31)
		In asteroids, skeletal support for the arms is provided by the ossicles of the body wall, which merge with those of the central disc, giving the arm a very broad based attachment to the disc.
		Taxonomy of asteroids usually is based on externally observable characteristics of the skeleton, particularly the primary ossicular series which define the body wall (ambulacrals, adambulacrals, marginals, terminals, actinals, abactinals), as well as secondary ossicles such as spines, spinelets and pedicellariae.
		Asteroid fossils are rare because 1) the skeletal elements rapidly dissociate after death of the animals 2) asteroids typically have a large body cavity that collapses with deterioration of the organs, resulting in misshapen forms and 3) asteroids often live on hard substrates which are not conducive to fossil formation.
	tolweb.org /tree?group=Asteroidea&contgroup=Echinodermata (3634 words)

	Earth-crosser asteroid - Wikipedia, the free encyclopedia
		An Earth-crosser asteroid is a Near-Earth asteroid whose orbit crosses that of Earth.
		Buried in the list is one peculiar asteroid: 3753 Cruithne, whose orbit enjoys an unusual special relationship with Earth's.
		The Earth-crosser asteroid group is a separate group from the Earth-crossing asteroid (ECA) group.
	en.wikipedia.org /wiki/Earth-crosser_asteroid (156 words)

	StarDate Online \| Solar System Guide \| Asteroids
		Most orbit the Sun in a broad region known as the asteroid belt, which is between the orbits of Mars and Jupiter.
		In the largest ones, the decay of radioactive elements heated their interiors, causing their material to "differentiate." In other words, gravity pulled the heavier materials, like iron and nickle, to the centers of these asteroids, while lighter rocks "floated" to the surface, creating a structure that is similar to Earth and the other inner planets.
		In many science-fiction movies, the asteroid belt is like a cosmic obstacle course, but the truth is far less dramatic: The asteroids are so widely separated that it's easy for a spacecraft to maneuver through the belt without even seeing an asteroid, much less running into one.
	stardate.org /resources/ssguide/asteroids.html (875 words)

	Notable Asteroids - Explore the Cosmos \| The Planetary Society
		The second asteroid ever discovered, Pallas is probably the second largest main belt asteroid in terms of volume but the third largest in terms of mass.
		Vesta was the fourth asteroid to be discovered, and is either the second or third largest (it competes for that honor with Pallas).
		It is a Trojan asteroid, meaning that it orbits as a companion to Jupiter, 60 degrees behind the giant in its orbit (at the gravitationally stable point known as "L5").
	www.planetary.org /explore/topics/asteroids_and_comets/asteroids.html (829 words)

	PSRD: Meteorite QUE 93148: Asteroid Mantle Material?
		The HED meteorites are a large group of crustal igneous rocks consisting of basalts, gabbros and orthopyroxenites.
		The main group pallasites have oxygen isotopic compositions similar to the HED meteorites and Dave Mittlefehldt and his colleagues have suggested that they may have originated on the same parent body.
		If the main group pallasites and the HED meteorites are indeed from the same parent body and if this parent body is in fact the asteroid 4 Vesta (two big unresolved 'ifs') then QUE 93148 might be our first sample from the mantle of this asteroid.
	www.psrd.hawaii.edu /Jan03/QUE93148.html (2494 words)

	Asteroids
		Asteroids are classified into a number of types according to their spectra (and hence their chemical composition) and albedo:
		Between the main concentrations of asteroids in the Main Belt are relatively empty regions known as the Kirkwood gaps.
		It is a particularly interesting asteroid in that it seems to have been differentiated into layers like the terrestrial planets.
	www.nineplanets.org /asteroids.html (1366 words)

	Asteroids
		Asteroids, sometimes called "minor planets," are composed of rock, metal, or both.
		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).
		Since some asteroids were melted, others merely heated, and others left cold, this implies that the distribution of radioactive elements was not uniform in the primeval solar system nebula.
	www.pibburns.com /catastro/asteroid.htm (1656 words)

	Japanese Discover Large Earth Crossing Asteroid (Site not responding. Last check: 2007-10-31)
		The group is based at the new Japanese Spaceguard Centre at Bisei, west of Osaka.
		Remarkably, the new asteroid was discovered with a test telescope, a tiny instrument having an aperture just ten inches across, a size of telescope owned by quite a few amateur astronomers.
		The new asteroid, which has been given the designation 2000 UV, and knowledge of whose orbit is continually being refined as new data come in, moves on a path that brings it within about ten million kilometres of the Earth's orbit, or about thirty times the distance to the Moon.
	www.arm.ac.uk /press/Large-Earth-Crossing-Asteroid.html (382 words)

	Introduction to SBN: Asteroid Studies
		Most Main Belt asteroids are located between the orbits of Mars and Jupiter (1.8 to 4.0 AU) in a region known as the asteroid belt.
		The Trojan asteroids are two groups of asteroids located along the orbital path of Jupiter, 60 degrees ahead and behind the planet.
		Asteroids are classified into types according to their albedo and colors or spectra, with the most common types being C, S, and M. C-type asteroids are very dark, with a low albedo of 0.03-0.06, and their spectra are flat, making their color grayish.
	pdssbn.astro.umd.edu /outreach/astudies.html (809 words)

	ScienceDaily: Astronomer Discovers New Asteroid Between Mars And Jupiter
		The group confirmed the presence of the asteroid the next day and sent information about it to the Minor Planet Center, which is operated by Harvard University, to verify that they had discovered a previously unknown body.
		Largest Asteroid May Be 'Mini Planet' With Water Ice (September 9, 2005) -- Observations of 1 Ceres, the largest known asteroid, have revealed that the object may be a "mini planet," and may contain large amounts of pure water ice beneath its surface.
		Asteroid belt -- 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...
	www.sciencedaily.com /releases/1999/10/991021075913.htm (1354 words)

	Oh So Interesting Asteroids... you know you love them (Site not responding. Last check: 2007-10-31)
		Asteroids are small bodies, sometimes referred to as the minor planets, that orbit the Sun.
		Asteroids are large enough that they are able to survive the harsh atmosphere surrounding earth, making them capable of colliding with Earth's surface, instead of being torn apart by the harsh gases in the atmosphere.
		A 280-kilometer wide “potato-shaped” asteroid named Sylvia has found itself quite popular with the additional discovery to the existing moon orbiting around her, and the two moons were appropriately dubbed Romulus and Remus, since Sylvia was the original name of mother of the “founders of Rome”.
	www.kn.sbc.com /wired/fil/pages/listasteroidci.html (1835 words)

	Three-Body Problem
		The Trojan asteroids lie in Jupiter's orbit equidistant from Jupiter and the sun.
		They are an example of what is known as the restricted three-body problem: the motion of a small body, an asteroid, under the influence of two massive bodies whose motion is not affected by the presence of the asteroid.
		Viewed in the rotating frame, an asteroid in a stable orbit remains at rest at a point where the net gravitational attraction balances the repulsive centrifugal force.
	www.kw.igs.net /~jackord/bp/f8.html (931 words)

	Asteroids (Site not responding. Last check: 2007-10-31)
		Most asteroids are found in the main-belt between the orbits of Mars and Jupiter, and are most probably the remains of a planet that failed to form, due to the perturbations of Jupiter.
		An almost equally large population is the Trojan asteroids, which are trapped in the two Lagrangian points 60 degrees ahead of and behind Jupiter in its orbit.
		Another important group is the near-Earth asteroids, where several are on Earth-crossing orbits and may pose a potential threat upon the Earth.
	www.astro.uu.se /planet/asteroid (254 words)

	aSTEROID rADAR hISTORY
		Radar and photoelectric observations of asteroid 2100 Ra-Shalom.
		Radar observations of asteroids 7 Iris, 9 Metis, 12 Victoria, 216 Kleopatra, and 654 Zelinda.
		Radar observations of asteroids 1 Ceres, 2 Pallas, and 4 Vesta (1995).
	echo.jpl.nasa.gov /asteroids/PDS.asteroid.radar.history.html (1758 words)

	Asteroid Ceres
		The Texas-sized asteroid Ceres, about 930 kilometers (580 miles) across, was the first asteroid ever detected.
		After discovering the asteroid, Piazzi was invited to join the Celestial Police, a group of 24 international astronomers looking for what they called "guest planets" between Mars and Jupiter.
		In July 2001, a larger object was found in the vast Kuiper belt of asteroids, stretching from 30 to 100 AU (2.8 to 9.3 billion miles away from the Sun.) This brightest and therefore biggest non-planet space rock, 2001 KX76, could be anywhere from 960 to 1270 kilometers (600 to 790 miles) across.
	www.solarviews.com /eng/ceres.htm (369 words)

	Asteroid Toutatis
		It appears to be two asteroids that are either loosely stuck together, rolling around against each other, or orbiting very close to one another.
		Most asteroids (and moons and planets) spin around a single axis, like a football thrown as a perfect spiral pass.
		The asteroid's orbit has an eccentricity (a measure of how oval-shaped it is) of 0.6339 and a semi-major axis (size) of 2.512 AU.
	www.windows.ucar.edu /tour/link=/asteroids/toutatis.html&edu=high (461 words)

	Asteroid (and Comet) groups
		Asteroids positions are computed for Apr. 7, 2004 and their orbital elements are taken from the MPCOrb database.
		Hilda asteroids are in a 3:2 resonance of mean motion with Jupiter (that means the orbital period of asteroids and that of Jupiter have ratio of 2:3).
		Asteroid taxonomic classes and albedos are taken from NASA PDS.
	sajri.astronomy.cz /asteroidgroups/groups.htm (1433 words)

	1 Ceres
		Ceres is the largest known asteroid in the asteroid belt, which mostly lies between Mars and Jupiter.
		Ceres is rare among asteroids in that its size and mass are sufficient to give it a nearly spherical shape: That is, it is a gravitationally relaxed equilibrium spheroid, or "planetary body".
		The bulk of that asteroid group is now called the Gefion family.
	www.brainyencyclopedia.com /encyclopedia/1/1_/1_ceres.html (1703 words)

	Astronomy for kids - learn about asteroids
		These asteroids appear darker than the asteroids of the inner belt, and are rich in carbon.
		Asteroids are left over materials from the formation of the Solar System.
		The new asteroid is even bigger than Ceres, which for over two hundred years had been thought to be the largest asteroid in the Solar System.
	www.kidsastronomy.com /asteroid.htm (452 words)

	SPACE.com -- Mission Possible: Asteroid Tugboat Backed for Trial Run
		Another thought is planting a nuclear device on one side of the asteroid, then detonating the bomb to accelerate the space rock slightly in the opposite direction.
		In their view, an asteroid is a "push over" push it just enough to miss an ugly date with Earth.
		Schweickart said the cost of a trial-run asteroid tug mission is quite modest and well within the capability of the NASA budget to handle.
	www.space.com /businesstechnology/technology/asteroid_tug_031015.html (1260 words)

	Somasteroidea (Site not responding. Last check: 2007-10-31)
		While the asteroids and ophiuroids have subsequently undergone extensive radiations and represent the two most successful extant echinoderm classes, somasteroid forms do not appear in the fossil record after the late Devonian and are therefore thought to have been extinct since then (Spencer, 1951; Blake, 1982).
		In addition, in asteroids the ambulacral plates are raised slightly off the surface upon which they sit, creating a space between the ambulacrals and the substrate.
		McKnight, D.G. Classification of Somasteroids and Asteroids (Asterozoa: Echinodermata).
	tolweb.org /tree?group=Somasteroids (1607 words)

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