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	Apollo asteroid
		Member of a group of asteroids whose orbits cross that of the Earth.
		They are named after the first of their kind, Apollo, discovered in 1932 by German astronomer Karl Reinmuth and then lost until 1973.
		Apollo asteroids are so small and faint that they are difficult to see except when close to the Earth (Apollo is about 2 km/1.2 mi across).
	www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0010251.html (161 words)

	Asteroid - MSN Encarta
		Asteroid, one of the many small or minor rocky planetoids that are members of the solar system and that move in elliptical orbits primarily between the orbits of Mars and Jupiter.
		Asteroids that intersect the orbit of Mars are called Amors; asteroids that intersect the orbit of Earth are known as Apollos; and asteroids that have orbits smaller than Earth’s orbit are called Atens.
		Three-quarters of the asteroids visible from Earth, as well as the dwarf planet 1 Ceres, belong to the C type, which appear to be related to a class of stony meteorites known as carbonaceous chondrites.
	encarta.msn.com /encyclopedia_761551567/Asteroid.html (2048 words)

	[No title]
		ASTEROID, one of the many small or minor planets that are members of the solar system and that move in elliptical orbits primarily between the orbits of Mars and Jupiter.
		By the late 1980s, about 75 asteroids, the Amor asteroids, were known to intersect the orbit of Mars, about 50 Apollo asteroids to intersect the orbit of the earth, and less than 10 Aten asteroids to have orbits smaller than the earth’s orbit.
		Three-quarters of the asteroids visible from earth, including Ceres, belong to the C type, which appear to be related to a class of stony meteorites known as carbonaceous chondrites.
	www.worldalmanacforkids.com /WAKI-ViewArticle.aspx?pin=wwwwak-182&article_id=535&chapter_id=12&chapter_title=Science&article_title=Asteroid (781 words)

	Apollo-class asteroid hits Earth’s orbit - Science News - Playfuls.com - Science & Technology
		PDT on July 2). The asteroid’s distance from Earth at that moment will be 268,624-miles (432,308 km), or just 1.1 times the Moon’s average distance from Earth.
		Based on its brightness, the asteroid's diameter is approximately 1,345 to 3,018 feet, or 410 to 920 meters.
		Scientists are very interested in asteroids since they are materials of the early years of the solar system.
	www.playfuls.com /news_001419_Apollo_class_asteroid_hits_Earths_orbit.html (255 words)

	Spaceflight Now \| Breaking News \| On-line volunteer finds Earth-approaching asteroid
		The asteroid appeared in images taken by Spacewatch astronomer Miwa Block with the 0.9-meter telescope at 1:49 UT on Jan. 19, which is 6:49 p.m.
		The asteroid is classified as an "Apollo" asteroid because it is on average slightly farther from the sun than the Earth is, but its modest orbital eccentricity causes it to occasionally cross Earth's orbit.
		The smallest asteroids are free of regoliths, the blanket of loose dust or dirt that obscures the bare rock surfaces of larger asteroids.
	www.spaceflightnow.com /news/n0401/22asteroid (1426 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).
		On the other hand, the Apollo asteroids present an opportunity for mining of raw materials since the Apollos are more easily reached than asteroids in the main belt.
	www.pibburns.com /catastro/asteroid.htm (1656 words)

	COMETS, METEORS, AND ASTEROIDS
		Asteroid Mathilde, left, is the third and the largest asteroid ever to be viewed at close range.
		Asteroids Gaspra and Ida, center and right, photographed by the Galileo orbiter in 1991 and 1993, respectively, are smaller and more oblong-shaped than Mathilde.
		Three-quarters of the asteroids visible from Earth, including 1 Ceres, belong to the C type, which appear to be related to a class of stony meteorites known as carbonaceous chondrites.
	www.geocities.com /beyondearth2001/asteroid.htm (1708 words)

	Zoom Astronomy Glossary: A
		Apollo asteroids have an orbit that crosses the orbit of the Earth and have a period longer than 1 year.
		Apollo 11's LEM or LM (Lunar Excursion Module or Lunar Module, dubbed the Eagle) separated from the orbiter and landed on the moon on July 20, 1969, with Neil Armstrong and Buzz Aldrin.
		The asteroid belt is a doughnut-shaped concentration of asteroids orbiting the Sun between the orbits of Mars and Jupiter (2.2 - 3.3 A.U.).
	www.enchantedlearning.com /subjects/astronomy/glossary/index.shtml (4918 words)

	IV-3
		The distribution of known asteroids as a function of distance from the Sun (semimajor axis a) is shown in figure 1.
		Between 1.8 and 3.5 AU (asteroid belt), this distribution is probably a reasonable representation of the actual distribution, subject to corrections for observational bias against the more distant and lower albedo (fainter) objects in the outer asteroid belt (ref.
		The major difficulty for an asteroidal source for meteorites (and Apollo asteroids) is to modify the orbit from that of a main-belt object to an Earth-approching object in as short a time as indicated by the cosmic-ray exposure age of the meteorites, or at a rate sufficient to maintain the Apollo population.
	www.nss.org /settlement/nasa/spaceres/IV-3.html (6434 words)

	\|\|:: Apollo Audio ::\|\| Independent Album Promotion and Digital Distribution
		You can also do your part to spread the word about each album -- we encourage you to forward the Apollo stream to your friends and colleagues, and embed your favorite stream(s) in your blogs and myspace pages -- its totally simple -- just copy the code from Share Menu in the player.
		Our website has zero brainwashing, sorry -- advertising, and our artists depend upon the Apollo Audio "network" to get the word out about their albums.
		We do not require that you sign up for our mailing list to listen, but we do ask that you sign up so that we can notify you of all new album previews, and any updates that might come from Apollo Audio.
	apolloaudio.com (430 words)

	Asteroid 4179 Toutatis
		Asteroid 4179 Toutatis (formerly 1989 AC) was discovered by C. Pollas on January 4, 1989, at Caussols, France, on photographic plates taken on the 0.9-m Schmidt telescope by Alain Maury and Derral Mulholland during astrometric observations of Jupiter's faint satellites.
		The inversion solved for the asteroid's shape and inertia tensor, their orientation with respect to each other, initial conditions for the asteroid's spin and orientation, the radar scattering properties of the surface, and the projected location of the asteroid's center of mass in each frame.
		The asteroid's 1996 approach was not as close as in 1992, and Arecibo was unavailable (that telescope was being upgraded), but Goldstone was used for high-resolution imaging on nine straight dates.
	echo.jpl.nasa.gov /asteroids/4179_Toutatis/toutatis.html (2595 words)

	SPACE.com -- Asteroid Spotting: Skywatchers to Glimpse Close Flyby
		Asteroid 2004 XP14 is an Apollo asteroid, a class that cross Earth's orbit.
		On April 13, 2029, the asteroid 99942 Apophis is expected to pass a mere 18,600 miles (30,000 km.) above Earth's surface.
		Normally with such a relatively small asteroid as 2004 XP14, its peak brightness would fall into the Pluto category, that is, it becomes no brighter than magnitude 13 to 15 and is only available to the most assiduous amateur astronomers and professionals with large instruments and sophisticated equipment.
	www.space.com /spacewatch/060629_night_sky.html (1115 words)

	[No title]
		The asteroid 1862 Apollo is about 1.5 km in diameter, it has a small moonlet, and its orbit crosses that of Earth.
		Apollo's rotation period is slightly over three hours, and it decreases only by four thousandths of a second per year, so the analysis required accurate mathematical methods.
		Apollo is now the first object larger than one kilometre across for which the propulsion effect has been detected.
	www.aka.fi /index.asp?Id=70983D3C99624961926BACD636146B0A&data=1,886DF6EFA394CAC9DC90F5CC0110D096,44738F89BB834590A4A0A655275B1A77&groupid=9222B8DEAC7444ABA00743C47EB08F0A&tabletarget=data_1&laytmp=aka_eng (413 words)

	Cornell University Presents - The Odysseus Team 2003-2004
		The asteroids are believed to be remnants of the protoplanetary disc which were not incorporated into planets during the solar system's formation.
		Asteroid geometries are extremely variable with some asteroids being singular solid bodies of rock while other asteroids are composed of many smaller asteroids orbiting in proximity as a rubble pile.
		Although the exact compositions of many asteroids are not known, a classification system for asteroids based on the albedo, or the fraction of electromagnetic energy a body reflects, is used to identify potential compositions.
	www.mae.cornell.edu /europa/outreach.htm (687 words)

	Spacewatch Publications in the Minor Planet Electronic Circulars
		Gleason, A. Followup Observations of Asteroids 2003 QB and 2003 SV In Gleason, A. Followup Observations of Asteroid 1998 FR In Gleason, A. Followup Observations of Periodic Comet P/2001 RG In Gleason, A. Followup of Asteroid 2003 WQ In Gleason, A. Followup Observations of Periodic Comet P/2003 UY In Gleason, A. and M. Block.
		Follow-up observations of Asteroids 2001 FB, and 2003 SN In Gleason, A. Larsen.
		Follow-up observations of Asteroids 2000 PJ and 2000 SU and incidental observations of Asteroids 1999 DB and (26663).In Scotti, J. Tubbiolo 2003.
	spacewatch.lpl.arizona.edu /mnptcrc.html (5583 words)

	Science Museum \| Antenna Science News \| Sun puts asteroids in a spin
		Asteroids are lumps of rock that orbit the Sun.
		Most asteroids are so small and so far away from Earth that we can't directly see how they move.
		Apollo is just one of the asteroids that Mikko's team are studying.
	www.sciencemuseum.org.uk /antenna/asteroidspin (599 words)

	Asteroid Collision in 2036?
		Further, Schweikart also indicated that the asteroid would be out of sight from 2006 to 2012; but when it reappeared, the chances for collision would probably be set to zero.
		For example, an asteroid that touched down in Winslow, Arizona roughly 50,000 years ago is hypothesized to have unleashed the equivalent energy of 500 Hiroshima bombs.
		Third, rubble pile asteroids would be near impossible to vaporize in such a fashion due to their composition.
	www.secretsofsurvival.com /survival/2036_asteroid.html (1800 words)

	Apollo Asteroid -- from Eric Weisstein's World of Astronomy
		The Apollo asteroids are a class of asteroids with Earth-crossing orbits.
		The asteroid was observed with radar by the Arecibo Ionospheric Observatory, leading to extremely precise estimates of its trajectory.
		The asteroid was estimated to be 300 to 1,000 feet in diameter.
	scienceworld.wolfram.com /astronomy/ApolloAsteroid.html (674 words)

	Asteroid -- from Eric Weisstein's World of Astronomy
		The majority of asteroids lie in a region called the asteroid belt which is located between the orbits of Mars and Jupiter.
		Asteroids whose orbits have been determined carefully enough so that their position on the sky as a function of time can be predicted are assigned permanent numbers and names by the Minor Planet Center.
		Asteroids are placed in families having similar orbits, with the most common families being the Amor, Apollo, and Aten groups, each named after a prominent asteroid in a given group.
	scienceworld.wolfram.com /astronomy/Asteroid.html (584 words)

	[No title]
		Asteroids are believed to have been jolted by either collision with other objects in space or primary by the gravitational field of the planet Mars or Jupiter.
		An asteroid 1 km in size would cause the sunlight to be blocked out for many years, due to all the dust that would be lifted into the atmosphere (Apollo Asteroid, Weisstein 1).
		Asteroids vary in their composition, many are made up of rock and a few are composed of other materials such as metals.
	jade.ccccd.edu /jwilson/asteroids.html (1721 words)

	Spaceflight Now \| Breaking News \| On-line volunteer finds Earth-approaching asteroid
		The asteroid appeared in images taken by Spacewatch astronomer Miwa Block with the 0.9-meter telescope at 1:49 UT on Jan. 19, which is 6:49 p.m.
		The asteroid is classified as an "Apollo" asteroid because it is on average slightly farther from the sun than the Earth is, but its modest orbital eccentricity causes it to occasionally cross Earth's orbit.
		The smallest asteroids are free of regoliths, the blanket of loose dust or dirt that obscures the bare rock surfaces of larger asteroids.
	spaceflightnow.com /news/n0401/22asteroid (1396 words)

	[No title]
		The vast majority are found in a swarm called the asteroid belt, between the orbits of Mars and Jupiter, at average distances of 2.1 to 3.3 ASTRONOMICAL UNITS (AU) from the Sun.
		One Apollo asteroid, now numbered 4581 and called Asclepius, passed within 800,000 km (500,000 mi) of Earth in 1989--the closest approach of a large asteroid since that of Hermes in 1937.
		Asteroids are thought to be remnants of the early solar system that never grew to planetary size.
	www.angelfire.com /co2/eradani7/asteroid.html (405 words)

	Asteroid has near-collision with Earth: scientists
		Apollo Asteroid 2004 XP14 was discovered by Lincoln Laboratory in Lexington, Massachusetts, a research facility which part of the Massachusetts Institute of Technology, and which claims the title of "the world's principal detector of asteroids" said Roger Sudbury, a spokesman for the lab.
		In the case of Monday's asteroid, he said, scientists were able to reassure the public that there was never any great risk, but that it would stray off course and crash into the Earth.
		The spokesman told AFP that near-Earth asteroids were once believed to be a rarity, but recent scientific and technological advances have allowed researchers to track asteroids that previously escaped detection.
	www.breitbart.com /news/2006/07/03/060703165347.gndu5ani.html (383 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.
		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.
		The asteroid passed 'close' to Earth on September 29, 2004.
	www.windows.ucar.edu /tour/link=/asteroids/toutatis.html&edu=high (461 words)

	Asteroids
		An Apollo asteroid may have caused the extinction of the dinosaurs when it collided with Earth 65 million years ago.
		Asteroids are made mostly of rock, often rich in iron and other metals, and perhaps some ice.
		The largest known asteroid, Ceres, is 623 miles (1,003 km) in diameter, and orbits roughly 260 million miles (420 million km) from the Sun.
	www.msu.edu /~pilantpa/webquest/asteroid.htm (653 words)

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