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	Asteroid Ida and Dactyl
		Ida is a heavily cratered, irregularly shaped asteroid in the main asteroid belt between Mars and Jupiter -- the 243rd asteroid to be discovered since the first one was found at the beginning of the 19th century.
		Dactyl is made more or less from the same kind of material as Ida. As an S-type asteroid, Ida is composed mostly of silicate rocks.
		This view of the asteroid 243 Ida was acquired by the Galileo spacecraft at ranges of 3,057 to 3,821 kilometers (1,900 to 2,375 miles) on August 28, 1993, about 3.5 minutes before the spacecraft made its close approach to the asteroid.
	www.solarviews.com /eng/ida.htm (1065 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 (2066 words)

	[No title]
		At the distance of Dactyl's orbit (90 km), the escape velocity is 9.3 meters/second.
		We have estimated the mean orbital speed of Dactyl at 6.5 meters/second and the escape velocity at the 90-kilometer orbit as 9.3 meters/second.
		Dactyl is far too small to alter the orbit of Ida appreciably, and so they will not change places in their solar orbit.
	www.sonic.net /~victormc/dactyl.html (3104 words)

	Dactyl
		In Greek mythology, the Dactyls were a strange race of creatures associated with the goddess Cybele as well as the Curetes, Cabiri and Korybantes[?].
		A dactyl is also an element of meter in poetry.
		Dactyl is a small asteroid orbiting the larger asteroid 243 Ida as a natural satellite.
	www.ebroadcast.com.au /lookup/encyclopedia/da/Dactyl.html (121 words)

	243 Ida
		Interestingly, while the spectra of Ida and Dactyl are very similar they are nevertheless distinctly different; Dactyl is not simply a chunk of Ida. It is thought that the binary system may have formed during the collision and breakup that created the Koronis family.
		This view of the asteroid 243 Ida was acquired by the Galileo spacecraft at ranges of 3,057 to 3,821 kilometers on August 28, 1993, about 3.5 minutes before the spacecraft made its close approach to the asteroid.
		Ida is a heavily cratered, irregularly shaped asteroid in the main asteroid belt between Mars and Jupiter the 243rd asteroid to be discovered since the first was found at the beginning of the 19th century.
	www.geocities.com /zlipanov/selected_asteroids/243_ida/243_ida.html (1565 words)

	SPACE.com -- First Asteroid Trio Discovered (Site not responding. Last check: )
		The main asteroid, named 87 Sylvia, is one of the largest known to orbit the Sun in the main asteroid belt, between Mars and Jupiter.
		The first pair was noted in 1993, when the Galileo spacecraft spotted the moonlet Dactyl orbiting asteroid Ida. Some pairs involve a smaller satellite, while in others the two objects are roughly equal in size.
		Asteroid 87 Sylvia was named for Rhea Sylvia, the mythical mother of the founders of Rome.
	space.com /scienceastronomy/050810_asteroid_trio.html (495 words)

	Dactyl
		Dactyl was found in orbit around Ida by the Galileo probe when it flew by the asteroid in 1993.
		Interestingly, the spectra of Ida (an S-class asteroid) and Dactyl reveal that the compositions of the two objects, though similar, are not identical; Dactyl is not simply a bit of Ida that broke off.
		Instead, it is thought that the binary system may have formed during the collision and breakup that created the Koronis family of asteroids.
	www.daviddarling.info /encyclopedia/D/Dactyl.html (231 words)

	Kids.Net.Au - Encyclopedia > 243 Ida (Site not responding. Last check: )
		243 Ida is an asteroid that was imaged by the Galileo probe on August 28, 1993.
		The probe discovered that Ida had a small moon, an asteroid dubbed Dactyl, only 1.4 km in diameter; this was the first asteroid moon to be discovered.
		Some researchers believe that Dactyl formed from debris ejected from Ida by cratering, while others suggest that Ida and Dactyl formed as a pair a billion or more years ago when Ida's parent body was disrupted.
	www.kids.net.au /encyclopedia-wiki/24/243_Ida (408 words)

	Asteroids
		Galileo flybys of asteroids Gaspra and Ida (and Ida satellite Dactyl).
		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.
	www.seds.org /nineplanets/nineplanets/asteroids.html (1354 words)

	SwRI Spring 2000 Technology Today
		Asteroids are thought to be composed primarily of rock, which is about three times denser than water.
		The presence of a moon enables scientists to determine the mass of an asteroid because of the effect of the primary asteroid's gravity on its moon.
		Asteroids are thought to be bodies that never formed a planet; the gravity of the giant planet Jupiter may have stirred up the bodies enough that they collided with each other at fast speeds, perhaps either fragmenting or forming satellites, rather than colliding gently, adhering, and gradually building up a planet.
	www.swri.org /3pubs/ttoday/Spring00/asteroid.htm (658 words)

	Asteroid Introduction
		Annefrank, Braille, Castalia, Ceres, Eros, Gaspra, Geographos, Ida and Dactyl, Mathilde, Toutatis, Vesta
		Asteroids that are on a collision course with Earth are called meteoroids.
		Then on October 1991 asteroid 951 Gaspra was visited by the Galileo spacecraft and became the first asteroid to have hi-resolution images taken of it.
	www.solarviews.com /eng/asteroid.htm (552 words)

	Dactyl (asteroid) - Biocrawler
		243 (1) Dactyl, is a tiny asteroid moon (diameter 1.4 km) that orbits asteroid 243 Ida with a period of 1.54 days at an average distance of 108 km, with an inclination of 9° to Ida's equator.
		The orbit is not very accurately known because the Galileo probe coincidentally passed very nearly in its plane whilst taking the images.
		Dactyl, found by the Galileo probe, was the first asteroid moon discovered.
	www.biocrawler.com /encyclopedia/Dactyl_%28asteroid%29 (192 words)

	243 Ida
		The second of the small number asteroids that have so far been observed close-up, Ida was encountered Aug. 28, 1993, by the Galileo spacecraft on its way to Jupiter.
		Interestingly, while the spectra of Ida and Dactyl are very similar they are nevertheless distinctly different; Dactyl is not simply a chunk of Ida. It is thought that the binary system may have formed during the collision and breakup that created the Koronis family.
		The surfaces of Ida and Dactyl are heavily cratered and therefore apparently quite old.
	www.nineplanets.org /ida.html (530 words)

	Main Asteroid Belt
		Indeed, many have orbits that cross Earth's path (see orbit diagram of near-Earth Asteroid 4179 Toutatis), and while small asteroidal fragments hit the Earth every day as meteorites, bigger asteroids are surmised to have landed with impacts that killed off a significant share of life on the planet in times past.
		Based on the composition of meteorites found on the Earth, most asteroids may be composed of three materials: mostly (92.8 percent) silicates (stone); metals (5.7 percent) iron and nickel; and the rest as a mix of the those materials and carbon-rich substances.
		Asteroids located closer to Mars and Earth that exhibit the same spectra are composed of rocky minerals ("stone") mixed with iron.
	www.solstation.com /stars/asteroid.htm (1425 words)

	Images Of Asteroids Ida & Dactyl
		Asteroid and spacecraft were 441 million kilometers (274 million miles) from the Sun.
		It is a member of the Koronis family, presumed fragments left from the breakup of a precursor asteroid in a catastrophic collision.
		Asteroid Ida rotates once every 4 hours, 39 minutes and clockwise when viewed from above the north pole; these images cover about one Ida 'day.' This sequence has been used to create a 3-D model that shows Ida to be almost croissant shaped.
	neo.jpl.nasa.gov /images/ida.html (1244 words)

	Spartanburg SC \| GoUpstate.com \| Spartanburg Herald-Journal
		(243) Ida I Dactyl (dak'-tl,) is a tiny asteroid moon (diameter 1.4 km) that orbits asteroid 243 Ida.
		The satellite was named after the mythical creatures called dactyls who lived on the Mount Ida according to the Greek mythology.
		Dactyl orbits Ida with a period of 1.54 days at an average distance of 108 km, with an inclination of 9Â° to Ida's equator.
	www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=Dactyl_(asteroid) (205 words)

	18. Ida and Dactyl
		Dactyl is not identical in spectral properties to any area of Ida in view here, though its overall similarity in reflectance and general spectral type suggests that it is made of basically the same rock types.
		Instead, scientists are theorizing that the two are siblings of a "family" of asteroids formed hundreds of millions of years ago when a larger, 100-kilometer-wide asteroid was shattered in a great collision.
		Their locations in these images were used to estimate Dactyl's orbit and Ida's bulk density, which is of great interest because it may indicate whether Ida is composed of rocks that have been thermally processed deep within a collisionally destroyed planetesimal.
	www.oarval.org /slide18en.htm (1251 words)

	Astronomy for kids - learn about asteroids
		An asteroid is a large rock in outer space.
		Due to their smaller size, asteroids do not have enough gravity to pull themselves into the shape of a ball.
		The inner belt which is made up of asteroids that are within 250 million miles of the Sun contains asteroids that are made of metals.
	www.kidsastronomy.com /asteroid.htm (451 words)

	Asteroid Fact Sheet
		The image above is a false color view of the asteroid 951 Gaspra taken by the Galileo spacecraft.
		Below is a table of information on selected asteroids, and at the bottom of the page are comments on the asteroids.
		433 Eros - Near-Earth asteroid being studied from orbit by the NEAR mission, which flew by Eros in February 1999 and went into orbit in February 2000.
	nssdc.gsfc.nasa.gov /planetary/factsheet/asteroidfact.html (565 words)

	Welcome to the Planets Version
		Ariel -- In Alexander Pope's poem "The Rape of the Lock", a spirit of the air, chief of the sylphs.
		asteroid -- One of many small rocky bodies orbiting the Sun; a concentration of these bodies makes up the Asteroid Belt between Mars and Jupiter.
		Dactyl -- In Greek mythology, a legendary being that lived on Mount Ida.
	pds.jpl.nasa.gov /planets/special/glossary.htm (2887 words)

	Asteroid Masses (Site not responding. Last check: )
		The perturbation of asteroids on Mars and the Earth are the largest poorly modeled problem in modern planetary ephemerides.
		The asteroids were not always considered to be a type of body separate from those of the other planets.
		Hilton, J.L. 1997, The Mass of the Asteroid 15 Eunomia From Observations of 1313 Berna and 1284 Latvia, Astron.
	aa.usno.navy.mil /hilton/asteroid_masses.htm (1082 words)

	Asteroid moon at AllExperts
		Asteroids with moons are commonly referred to as binary asteroids.
		The term double asteroid is sometimes used for systems in which the asteroid and its moon are roughly the same size.
		In 2005, the asteroid 87 Sylvia was discovered to have two moons, making it the first known triple asteroid.
	en.allexperts.com /e/a/as/asteroid_moon.htm (397 words)

	Lexikonia.de - Informationen zu Dactyl (Asteroid) (Site not responding. Last check: )
		Dactyl ist ein kleiner Asteroid mit einem Durchmesser von 1,4 Kilometern, der den Asteroiden 243 Ida (Asteroid) als Mond (Trabant) umkreist.
		Dactyl wurde 1993 beim Vorbeiflug der Raumsonde Galileo (Raumsonde) entdeckt und war der erste bekannte Asteroidenmond.
		Zur Entstehung von Dactyl existieren zwei Theorien: Entweder wurde Dactyl bei einem Impaktereignis auf Ida ausgeschleudert, oder Ida und Dactyl sind die Überbleibsel eines größeren Ursprungskörpers, der bei einer Kollision zersprengt wurde.
	www.lexikonia.de /127578_3_dactyl_asteroid.htm (164 words)

	Ground Scope Spys Asteroid Moon
		Initial observations suggest the asteroid's moon is either a porous clump of rubble or a sizable chunk of ice.
		The presence of a moon allows scientists to determine the mass of an asteroid because of the effect of the primary asteroid's gravity on its small moon.
		Eugenia orbits the sun in the main asteroid belt, a collection of thousands of asteroids that exists between the orbits of Mars and Jupiter.
	www.spacedaily.com /news/asteroid-99j.html (955 words)

	Reference.com/Encyclopedia/Dactyl (moon)
		(243) Ida I Dactyl is a tiny asteroid moon (diameter 1.4 km) that orbits asteroid 243 Ida.
		The satellite was named after the mythical creatures called dactyls who lived on the Mount Ida according to the Greek mythology.
		Dactyl orbits Ida with a period of 1.54 days at an average distance of 108 km, with an inclination of 9° to Ida's equator.
	www.reference.com /browse/wiki/Dactyl_(asteroid) (241 words)

	243 Ida
		The second of the small number asteroids that have so far been observed close-up, Ida was encountered Aug. 28, 1993, by the Galileo spacecraft on its way to Jupiter.
		The discovery that one out of two asteroids observed up close is in fact a binary system has reinvigorated an old debate about the frequency of binary asteroids.
		The surfaces of Ida and Dactyl are heavily cratered and therefore apparently quite old.
	www.seds.org /nineplanets/nineplanets/ida.html (530 words)

	Colonization of the asteroids at AllExperts
		Asteroid mining, a proposed industrial process in which asteroids are mined for valuable materials, esp. platinum group metals from metallic objects, may require a crew to remain at any target asteroid.
		Asteroid colonies feature in Peter F Hamilton's Nights Dawn Trilogy, where there are thousands of inhabited asteroids in Earth orbit, some of which are linked to Earth via space elevators.
		In the anime series Gundam asteroids are utilized for a variety of purposes, from colonies (Axis) to military bases (A Baoa Qu).
	en.allexperts.com /e/c/co/colonization_of_the_asteroids.htm (471 words)

	Asteroids: Zoom Astronomy
		Asteroids are rocky or metallic objects, most of which orbit the Sun in the asteroid belt between Mars and Jupiter.
		The asteroid belt may be material that never coalesced into a planet, perhaps because its mass was too small; the total mass of all the asteroids is only a small fraction of that of our Moon.
		Trojan asteroids are asteroids that orbit in gravitationally stable Lagrange points in a planet's orbit, either trailing it or preceding it (these places are where the gravitational attraction of the Sun and of the planet balance each other).
	www.enchantedlearning.com /subjects/astronomy/asteroids (780 words)

	SPACE.com -- Astronomers Report On Strange Double Asteroid
		Asteroid 216 Kleopatra, first discovered in 1880, previously was thought to be a solo dumbbell-shaped object.
		That asteroid or pair is much smaller in diameter (about a mile across) and has been studied extensively with radar.
		Other cases include asteroids with moons -- asteroid 243 Ida and its moon Dactyl, and asteroid 45 Eugenia, whose moon was reported in October to be photographed by an Earth-based telescope for the first time.
	www.space.com /science/astronomy/double_asteroid_991118.html (743 words)

	Asteroids: An Introduction
		Asteroid 253 Mathilde, a Near-Earth Asteroid photographed by NASA's NEAR (Near Earth Asteroid Rendezvous) mission in June 1997.
		The asteroid belt is a doughnut-shaped concentration of asteroids orbiting the Sun between the orbits of Mars and Jupiter, closer to the orbit of Mars.
		A less satisfactory explanation of the origin of the asteroid belt is that it may have once been a planet that was fragmented by a collision with a huge comet.
	users.zoominternet.net /~matto/M.C.A.S/Asteroids_description.htm (643 words)

	Ida and Dactyl: Asteroid and Moon-kui57's資訊中心
		The second asteroid it photographed, called Ida, was discovered to have a moon which appears as a small dot to the right of Ida in this picture.
		The tiny moon, named Dactyl, is about one mile across, while the potato shaped Ida measures about 36 miles long and 14 miles wide.
		Dactyl is the first moon of an asteroid ever discovered.
	kui.name /NEWS/astroimg/view_17.html (98 words)

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