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Topic: Asteroid moons

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	Asteroids.com: The Best Links to Asteroid Information
		The word Asteroid is most commonly used in science to describe a group of relatively tiny celestial objects that orbit the sun.
		The asteroid belt is the region of the Solar System located roughly between the orbits of the planets Mars and Jupiter where 98.5% of the known minor planet orbits can be found Asteroids, or minor planets, are small celestial bodies composed of rock, ice, and some metal that orbit the Sun.
		Discoveries of asteroid moons (and binary objects, in general) are very important because the determination of their orbits provides estimates (or at least constraints) on their density and mass allowing an insight into their physical properties, impossible otherwise.
	www.asteroids.com (279 words)

	Asteroid article - Asteroid Solar System minor planet planets protoplanetary disc moons - What-Means.com (Site not responding. Last check: )
		The asteroids are believed to be remnants of the protoplanetary disc which were not incorporated into planets during the system's formation.
		The term "asteroid" was coined by William Herschel because of the star-like appearance of the first few asteroids discovered (the other then-known planets all show discs, by comparison).
		Asteroids are commonly classified into groups based on the characteristics of their orbits and on the details of the spectrum of sunlight they reflect.
	www.what-means.com /encyclopedia/Asteroid (2048 words)

	Asteroid moon - Wikipedia, the free encyclopedia
		An asteroid moon is an asteroid that orbits another asteroid.
		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.
	en.wikipedia.org /wiki/Asteroid_moon (262 words)

	astronomypage
		Asteroids are objects smaller than planets that mostly occupy the orbit between Mars and Jupiter, between 2.3 and 3.3 AU from the Sun, and are composed in significant part of non-volatile minerals.
		The asteroids are thought to be the remnants of a small terrestrial planet that failed to coalesce due to the gravitational interference of Jupiter.
		Asteroid moons are asteroids that orbit larger asteroids.
	www.skygazer.se /theamazingsky/astronomypage.htm (951 words)

	ASTEROID MOON FACTS AND INFORMATION (Site not responding. Last check: )
		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.
		An example of a double asteroid is 90_Antiope, where two equal-sized components orbit the common centre of gravity.
	www.witwik.com /asteroid_moon (214 words)

	Solar system - Open Encyclopedia (Site not responding. Last check: )
		Asteroids are objects smaller than planets that lie roughly within the orbit of Jupiter and are composed in significant part of non-volatile minerals.
		Asteroid moons are asteroids that orbit larger asteroids.
		Meteoroids are asteroids that range in size from roughly boulder sized to particles as small as dust.
	open-encyclopedia.com /Solar_system (1464 words)

	Mars Moons Phobos and Deimos - Planetary News \| The Planetary Society
		Mars Moons Phobos and Deimos - Planetary News
		Planetary News: Mars Moons Phobos and Deimos (2007)
		There are no news stories to display from the year 2007 for the subject Mars Moons Phobos and Deimos.
	planetary.org /news/subjects/mars_moons_phobos_and_deimos (52 words)

	NATURAL SATELLITE FACTS AND INFORMATION (Site not responding. Last check: )
		Several moons are thought to be captured asteroids; others may be fragments of larger moons shattered by impacts, or (in the case of Earth's Moon) a portion of the planet itself blasted into orbit by a large impact.
		Most moons in the solar system are tidally locked to their primaries, meaning that one side of the moon is always turned toward the planet.
		Exceptions are Saturn's moon Hyperion, which rotates chaotically due to a variety of external influences, and the outermost moons of the gas giants, which are too far away to become 'locked' (an example is Saturn's moon Phoebe).
	www.witwik.com /natural_satellite (449 words)

	The Solar System
		This moon is the second closest moon to the surface of Jupiter.
		da is the ninth moon from the Surface of Jupiter.
		Himaila is the tenth moon from the surface of Jupiter.
	www.kidsastronomy.com /jupiter/moons.htm (938 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.
		Asteroid 87 Sylvia was named for Rhea Sylvia, the mythical mother of the founders of Rome.
		The asteroid's low density and known size allowed astronomers to calculate that it must be a rubble pile, rather than a solid rock.
	www.space.com /scienceastronomy/050810_asteroid_trio.html (575 words)

	Asteroid World Encyclopedia, India encyclopedia, Featured Articles, Cover Stories, World wide Informations @ ... (Site not responding. Last check: )
		Ironically, the first asteroid, 1 Ceres, was not discovered by a member of the group, but rather by accident in 1801 by Giuseppe Piazzi director, at the time, of the observatory of Palermo, in Sicily.
		Until the age of space travel, asteroids were merely pinpricks of light in even the largest telescopes and their shapes and terrain remained a mystery.
		The first true asteroid to be photographed in close-up was 951 Gaspra in 1991, followed in 1993 by 243 Ida and its moon Dactyl, all of which were imaged by the Galileo probe en route to Jupiter.
	www.mirchigold.com /index.php?title=Asteroid (3238 words)

	Asteroid Page
		IOTA astronomers were the first to discover asteroid moons by this technique, indicated by a 2nd occultation as the asteroid moon drifts in front of the target star.
		Since the star vanishes for several seconds as the dark asteroid moves in front of it, its size and shape can be determined from analysis of their observations and their exact location on the ground.
		The prediction of an asteroid occultation depends on the accuracy of the stars position and the accuracy of the asteroid's orbit.
	weblore.com /richard/AsteroidPage.htm (2671 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 (451 words)

	Solar System Exploration: Planet Selector
		Asteroids are rocky, airless worlds that orbit our Sun, but are too small to be called planets.
		With a diameter of 933 km (580 miles), Ceres is the undisputed ruler of the asteroid belt.
		The best known of these asteroid moons is Dactyl, a 0.7 km (1-mile) wide rock orbiting Asteroid Ida. It was the first natural satellite of an asteroid to be found and was discovered when the Galileo spacecraft flew past on its journey to Jupiter.
	solarsystem.nasa.gov /planetselector.cfm?Object=Asteroids (579 words)

	USATODAY.com - Asteroids found to have twins, moons (Site not responding. Last check: )
		JPL, AP Dactyl, a smaller rock orbiting the asteroid Ida, is the first moon discovered to be orbiting an asteroid.
		The odds of two asteroids hitting the Earth in the same location and at the same time are slim — unless they were paired before impact.
		The two moons of Mars, Phobos and Deimos, are probably asteroids captured in orbit by the planet's gravitational tug.
	www.usatoday.com /news/science/astro/2001-05-31-asteroid-moon.htm (566 words)

	Moon Discovery
		The radius of the orbit is 1190 km.
		The main asteroid's diameter is close to 215 km (depicted here as a central white circle) and we estimate the moon's size is 13 km in diameter.
		The moon is 285 times fainter than the main asteroid and is very close to the main asteroid (just over 5 asteroid diameters away, or 0.77 arcseconds on the sky).
	www.boulder.swri.edu /~merline/press_release (582 words)

	Press Release 2000 10 26
		Asteroid Pulcova was observed in February 2000 at the 3.6 m Canada-France-Hawaii Telescope, located atop Mauna Kea on the Big Island of Hawaii.
		Asteroid Pulcova itself has a diameter of 150 km, and the moonlet orbits Pulcova at a distance of 800 km.
		Discovering asteroid moons is not the only exciting thing Adaptive Optics can do for the astronomers: It allows to look at the shape of the asteroids when they are not far from the Earth.
	www.cfht.hawaii.edu /News/PR_001026 (625 words)

	Known populations of solar system objects
		Asteroids orbiting in Mars' L4 and L5 positions (60 degrees ahead of and behind Mars, respectively).
		Asteroids orbiting in Jupiter's L4 and L5 positions (60 degrees ahead of and behind Jupiter, respectively).
		An estimated 177 man-made objects are orbiting the Sun, 5 are orbiting Venus, 13 are orbiting Mars, 1 is near asteroid (25143) Itokawa, 1 is orbiting Saturn, and 4 are beyond the Kupier Belt escaping the solar system.
	www.johnstonsarchive.net /astro/sslist.html (591 words)

	you get: asteroid 87 sylvia
		The moonlets of asteroid 87 Sylvia: Remus and Romulus One of the thousands of small planets orbiting the Sun has been found to have a mini planetary system of its own.
		Photograph of the asteroid 87 Sylvia, recorded Aug. 9, 2004, using the Very Large Telescope at Cerro Paranal of the European...
		PR Video Clip 03/05 is an artist rendering of the triple asteroid system showing the large asteroid 87 Sylvia spinning at a rapid rate and surrounded by two smaller asteroids (Remus and Romulus) in...
	www.wanne-eickel-englisch.de /asteroid_87_sylvia.html (327 words)

	Conference To Discuss Asteroid Danger
		In recent movies, asteroids and comets are shown threatening to collide with the Earth, only to be destroyed at the last minute by astronaut heroics.
		A new view has evolved, suggesting that many large asteroids are "rubble-piles," according to William Bottke, a research associate in Cornell's Department of Astronomy, who will moderate the press session (Friday, July 30, 10 a.m., Princeton-Yale Room, Statler Hotel) on asteroid moons and spins.
		These moons are most likely to be a by-product of close encounters between rubble-pile asteroids and planets.
	www.terradaily.com /news/asteroid-99c.html (709 words)

	APOD: October 14, 1999 - Moon Over Eugenia (Site not responding. Last check: )
		Main belt asteroid Eugenia, represented here as a central white patch, is a mere 215 kilometers in diameter.
		Dactyl, moon of the asteroid Ida, was discovered by the Galileo spacecraft during a 1993 flyby.
		The orbit appears oval-shaped because it is tilted at a 45 degree angle to the line-of-sight.
	antwrp.gsfc.nasa.gov /apod/ap991014.html (226 words)

	Lake Afton Public Observatory's The Universe at a Glance
		In March of 1994 scientists at the Jet Propulsion Laboratory announced the discovery of a moon of asteroid Ida. This marks the first discovery of an asteroid moon.
		The fact that one of the very few asteroids to have been examined up-close has a moon, led one scientist to remark that asteroid moons are "probably more common than previously thought." If they are not common, finding one so early would be a remarkable coincidence.
		Very few asteroids have been seen in such detail which raises the point that possibly a high percentage of asteroids are actually one or more bodies traveling together.
	webs.wichita.edu /lapo/idamoon.htm (632 words)

	Press Conference Schedule
		Spacecraft missions to comets and asteroids are necessary to study the origins of the solar system and to measure their strengths and densities in case we need to deflect one from an Earth impacting trajectory.
		If true, these moons are most likely to be a by-product of close encounters between rubble-pile asteroids and planets; when a rubble-pile asteroid passes too close to a planet like Earth, tidal forces can pull it apart, leaving some of the fragments to orbit one another.
		Asteroid 6489 Golevka passes 0.05 AU from the Earth on 1999 June 3, and will be imaged with the Arecibo Observatory Planetary Radar system over a two-week interval centered on that date using the DSN Madrid Tracking Station 70 m antenna as an additional receiving station.
	www.news.cornell.edu /releases/July99/ACM/pressconf.html (6947 words)

	NTU Info Centre: Asteroid (Site not responding. Last check: )
		The term "asteroid", meaning star-like (from the Greek asteroeides, aster "star" + -eidos "form, shape"), was coined in 1802 by Sir William Herschel shortly after Olbers discovered the second one, 2 Pallas, in late March of the same year, to describe their star-like appearance; the other then-known planets all show discs, by comparison.
		As of January 19, 2005, orbits of 96,154 "minor planets" had been calculated well enough to be given official numbers and 11,996 of these had been officially named (582 of which have names requiring Unicode).
		Arthur C. Clarke's novel Odyssey Three (1986) depicts a journey through the asteroid belt and its ominous parallels with the journey of the RMS Titanic.
	www.nowtryus.com /article:Asteroid (2440 words)

	PERMANENT - Asteroids Near Earth - Probes (Site not responding. Last check: )
		It is much easier to fly pass an asteroid or comet (or move to where they will fly past you) than it is to match their orbit and land on them.
		However, the fact that this second asteroid flyby revealed a moon supports a school of thought that asteroids are likely to come in swarms, as collisions are likely to produce groups of asteroids orbiting each other.
		When the asteroid encounter occurred, no good pictures were taken, partly due to the asteroid being darker than the worst-case scenario envisioned (surface high in carbon?), and then a software bug which caused the failure of the target tracking system and a "safe mode".
	www.permanent.com /a-probes.htm (6487 words)

	United Press International - Science & Technology (no pub) - Asteroid moons pulled in by gravity (Site not responding. Last check: )
		Since observations from the spacecraft Galileo first revealed in 1993 a binary asteroid system -- the primeval space rock Ida orbited by its satellite Dactyl -- in the main asteroid belt between the planets Mars and Jupiter, astronomers have observed more than a dozen pairs of such frozen relics of the solar system's beginnings.
		For example, astronomers estimate some 17 percent of near-Earth asteroids come as twosomes, while models for satellite formation indicate many of these objects are little more than rubble piles, he said.
		Since the first KBO moon was discovered in 2001, another six binary systems have been observed with ground-based telescopes and the Hubble Space Telescope, bringing the total to eight, including Pluto/Charon.
	www.upi.com /view.cfm?StoryID=20021211-042209-2670r (1391 words)

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