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Topic: Aten asteroid

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	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)

	Asteroids (Site not responding. Last check: 2007-08-09)
		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.seds.org /billa/tnp/asteroids.html (1354 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).
		The orbits of the Aten asteroids also cross the Earth's orbit, but their average distance from the sun is less than the Earth's orbit (1 AU).
	www.pibburns.com /catastro/asteroid.htm (1656 words)

	Planetoïde 1997 AC11 kan op aarde botsen
		With the discovery of more Atens, the relative importance of these competing influences may be better understood.
		It is only the 24th Aten to be discovered in 21 years, since Helin found and named the first Aten in January 1976.
		With orbits that are smaller than Earth's, and short periods, Atens are in the vicinity of Earth frequently.
	www.xs4all.nl /~carlkop/atena.html (892 words)

	[No title]
		Asteroids are thought to have originated by materials that were left over from the formation of planets or moons in our solar system.
		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.
		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)

	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 (801 words)

	Zoom Astronomy Glossary: A
		This theory is that a large asteroid, meteor, or comet hit the Earth 65 million years ago, causing huge atmospheric and geologic disruptions, leading to a mass extinction which killed the dinosaurs and many other species.
		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.).
		Atens are asteroids that are always closer to the Sun than the Earth is; they have a period shorter than 1 year (the semi-major axis is smaller than Earth's).
	www.enchantedlearning.com /subjects/astronomy/glossary/index.shtml (4918 words)

	Great Balls of Fire!
		Asteroids, by definition, are any one of a large number of solid objects in the solar system that orbit the sun.
		Because asteroids orbit the sun, rather than a planet of the sun, they are sometimes known as "small planets." Objects less than 33 feet in diameter that enter Earth’s atmosphere typically burn up and explode high in the Earth’s atmosphere.
		The Amor asteroids intersect the orbit of Mars, the Aten asteroids orbit the sun inside Earth’s orbit and the Trojan asteroids orbit the sun in a similar orbit and speed as Jupiter.
	www.wake-up.org /daystar/ds1997/MAR97A.html (6567 words)

	Task Force Report
		The largest asteroid is Ceres, diameter 950 kilometres, and the size of asteroids ranges down to countless numbers of boulders.
		aten: an asteroid with an orbit that is mostly interior to that of the Earth; its orbit may cross that of Earth.
		Earth crossing asteroid [or comet]: an asteroid [or comet] whose orbit crosses that of the Earth if viewed from the pole of the Earth’s orbit; the asteroid [or comet] may pass above or below the Earth’s orbit.
	www.nearearthobjects.co.uk /report/annexE.htm (1017 words)

	AstroGuard -- hazardous Comet/Asteroid news & information
		The small asteroid 2006 YE was discovered by the Mount Lemmon Survey on 16 December, the day it passed about 1.2 million miles (1.9 million km) of Earth.
		The small asteroid 2006 XP4 was discovered by the Mount Lemmon Survey on 14 December, five days after it passed within 6.8 million miles (11 million km) of Earth.
		The small asteroid 2006 WP1 was discovered on 18 November by the Mount Lemmon Survey, two days after it passed within 193,000 miles (311,000 km) of Earth.
	www.astroguard.com (1795 words)

	Tiverton A.S. \| The Solar System
		The surface material of asteroids shares very similar compositions to those of meteorites, so it is believed that meteorites originate from broken-up asteroids.
		In turn, asteroids are believed to be the remnants of large planetesimals (similar in size to Mars) which collided early in the Solar System's existence.
		Another mission called MUSES-C (incorporating the MUSES-CN Asteroid Rover), due for launch in 2002, is the first asteroid sample-return mission, and plans to land a small rover on asteroid 4660 Nereus.
	www.tivas.org.uk /solsys/tas_solsys_asteroid.html (508 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.
	pages.prodigy.net /wrjohnston/astro/sslist.html (612 words)

	Near-Earth Asteroids: Zoom Astronomy
		These asteroids probably came from the main asteroid belt, but were jolted from the belt by collisions or by interactions with other objects' gravitational fields (primarily Jupiter).
		Atens (named for asteroid Aten, #2062): Atens are asteroids that are always closer to the Sun than the Earth is; they have a period shorter than 1 year (the semi-major axis is smaller than Earth's).
		Cruithne is an asteroid about 3 miles (5 kilometers) in diameter that is co-orbital with the Earth, which means that it shares roughly the same orbit as the Earth.
	www.zoomwhales.com /subjects/astronomy/asteroids/nea.shtml (429 words)

	Previous NEAT Images
		Hungarias are a class of asteroids that inhabit high inclination orbits between Mars and the main asteroid belt.
		NEAT recovery observations (96to5c96.jpg) from 12/17/96 of the Near-Earth asteroid 1996 TO discovered with NEAT in October 1996.
		A New High-Inclination Mars-Crossing Asteroid: 1997 AB was discovered on 1/12/97 and recovered on 1/13/97 with NEAT.
	neat.jpl.nasa.gov /neatimg.html (1605 words)

	[No title] (Site not responding. Last check: 2007-08-09)
		Most asteroids are located in a belt between Mars and Jupiter from 2.2 to 3.3 AU from the Sun.
		An asteroid whose orbit crosses the Earth's orbit or will at some time cross the Earth's orbit as it evolves under the influence of perturbations from Jupiter and the other planets.
		Asteroids occupying the main asteroid belt between Mars and Jupiter, sometimes limited specifically to the most populous parts of the belt, from 2.2 to 3.3 AU from the Sun.
	www.au.af.mil /spacecast/app-v/app-v.doc (2100 words)

	PERMANENT - Asteroids Near Earth - Location, Geology Etc
		However, asteroids are rich in free iron and nickel metal, as well as in the platinum group metals which are rare and valuable in Earth's crust.
		The ratios of the elements and minerals vary markedly from asteroid to asteroid, due to the diversity of origins and histories of asteroids.
		For example, in an asteroid that did not differentiate due to gravity, the oxygen was gobbled up mainly by the elements silicon, magnesium, aluminum and calcium, leaving out most of the iron and other metals and elements which could not compete for the oxygen in terms of strength of molecular bonds.
	www.permanent.com /a-geolog.htm (1907 words)

	Asteroid finder named to hall of fame (Site not responding. Last check: 2007-08-09)
		Asteroid finder and astronomer Eleanor F. Helin of NASA's Jet Propulsion Laboratory, Pasadena, CA, has been named to the Women in Science and Technology International (WITI) Hall of Fame, an award that honors women in science and technology worldwide.
		She is the principal investigator for the Near Earth Asteroid Tracking (NEAT) program, a collaborative effort of NASA, JPL and the U.S. Air Force which has already detected more than 26,000 objects including 30 near-Earth asteroids.
		Another of her asteroid discoveries, KD 1992, was recently named the new target for a flyby by to be conducted in July 1999 by the NASA/JPL Deep Space 1 spacecraft, due for launch this November.
	www.jpl.nasa.gov /releases/98/helinawd.html (366 words)

	chapter15
		Within tens of millions of years, these asteroids are likely to be destroyed by striking the Earth.
		Most of the small asteroids are the eroded cores of much larger bodies.
		However, asteroids that resemble ordinary chondrites, the most common kind of meteorite, are either absent or very scarce.
	www.csulb.edu /~htahsiri/astrouci/chapter15.html (994 words)

	Asteroids with satellites (Site not responding. Last check: 2007-08-09)
		History: The first observations purporting to reveal asteroid satellites were lightcurve measurements during stellar occultations by asteroids, such as those of (6) Hebe in 1977 and (532) Herculina in 1978.
		The first confirmed asteroid satellite discovery was made by Galileo during its flyby of (243) Ida in 1993.
		Asteroid Moons, Astronomical Society of the Pacific (2001).
	www.johnstonsarchive.net /astro/asteroidmoons.html (1189 words)

	Much Ado about 2000 SG344 (Site not responding. Last check: 2007-08-09)
		When the object was first discovered it appeared to be a small asteroid, but another possibility is gaining favor among researchers.
		Using the Canada-France-Hawaii telescope atop Mauna Kea, the pair were looking for unusual near-Earth asteroids in orbits whose greatest distance from the Sun coincides with the Earth's orbit.
		Atens spend most of their time inside Earth's orbit, crossing over for brief intervals only.
	spacescience.com /headlines/y2000/ast06nov_2.htm (1466 words)

	Glossary \| International Meteor Organization
		Permanent designations consist of numbers and names, beginning with (1) Ceres, given to asteroids for which orbits are accurately determined.
		A solid object moving in interplanetary space, of a size considerably smaller than a asteroid and considerably larger than an atom or molecule.
		Stream of solid particles released from a parent body such as a comet or asteroid, moving on similar orbits.
	www.imo.net /glossary (1047 words)

	2062 Aten - Wikipedia, the free encyclopedia
		2062 Aten is an asteroid that was discovered at the Palomar Mountain Observatory by Eleanor F. Helin, who is now the principal scientist for the NEAT (Near-Earth Asteroid Tracking) project.
		Aten was the first asteroid found to have a semi-major orbital axis of less than one astronomical unit.
		A new category of asteroids was thus created, the Atens, of which 16 are known and numbered, and some 212 awaiting numbering as of July 2004, ranging from (99907) 1989 VA to 2004 MD Minor planets
	en.wikipedia.org /wiki/2062_Aten (168 words)

	WITI - Eleanor F. Helin
		This program is responsible for the discovery of several thousand asteroids of all types including approximately 30 percent of the Near-Earth Asteroids (NEA's) discovered world-wide, over 200 high inclination objects, other rare and unique orbital types of asteroids; and 20 comets.
		One of the most significant discoveries was that of asteroid (2062) Aten, the first asteroid found to have an orbit smaller than that of the Earth.
		It is an electronic Near-Earth Asteroid (and comet) search program utilizing a JPL fabricated CCD camera installed on an Air Force 1 meter telescope located at the summit of Haleakula on the island of Maui.
	www.witi.com /center/witimuseum/womeninsciencet/1998/061298.shtml (716 words)

	Asteroid Types (Site not responding. Last check: 2007-08-09)
		An Amor is an Earth-approaching NEA with its orbit exterior to the Earth's but interior to Mars' (named after asteroid 1221 Amor).
		An Apollo is an Earth-crossing NEA with its semi-major axes larger than the Earth's (named after asteroid 1862 Apollo).
		An Aten is an Earth-crossing NEA with its semi-major axes smaller than the Earth's (named after asteroid 2062 Aten).
	www.minorplanetresearch.org /asteroidtypes.htm (60 words)

	Known populations of solar system objects
		These three objects are not included in the counts of asteroids and outer solar system objects, and Pluto is not included in the count of planets.
		Note that most of the 494 "other" provisional comets are from pre-modern observations and have no computed orbits.
		An estimated 181 man-made objects are orbiting the Sun, 6 are orbiting Venus, 14 are orbiting Mars, 1 is orbiting Saturn, and 8 are escaping the solar system.
	www.johnstonsarchive.net /astro/sslist.html (599 words)

	2000 PH5 Recovery Campaign
		Aten asteroid 2000 PH5 will be making its first return to the vicinity our planet since its
		The approach geometry is such that 2000 PH5 will come out of the sun in the northwestern sky, brightening and moving quite rapidly.
		As time progresses, over a period of a few days, the asteroid will move toward the opposition point, get brighter and slow down.
	www.camarilloobservatory.com /campaigns/2000ph5.htm (822 words)

	Your Sky Help: Asteroid and Comet Tracking
		You can plot the orbit and current position of an asteroid (minor planet) or comet by pasting its orbital elements into the text box provided for that purpose.
		For example, here are the elements published in MPEC 1995-C12 of February 6th, 1995 announcing the discovery of "1995 CR", a new extremely rare "Aten-type" asteroid which orbits the Sun in less time than the Earth.
		Elements for recovered asteroids (those re-observed after their original discovery at a subsequent favourable apparition) and revised elements based upon refinement of an orbit by subsequent observations are published in a slightly different form, with an "Id." line between the object's name and the epoch of the elements.
	www.fourmilab.ch /yoursky/help/elements.html (1092 words)

	ESA - NEO - Past studies: Earthguard I
		The goal of the study is to define a space mission and a dedicated payload concentrating on the detection of those NEOs whose orbits lie mostly or entirely within the orbit of the Earth.
		The former group of objects is known as Atens (named after asteroid 2062 Aten which was the first of this class to be discovered) while the latter are referred to as Inner-Earth-Objects, or, in short IEOs.
		From this vantage point, not only would Atens and IEOs be more easily detected against a dark sky background, but they would also appear brighter due to the smaller solar phase angles in the same way that the full Moon appears much brighter than the crescent Moon.
	www.esa.int /SPECIALS/NEO/SEM2GT59CLE_0.html (625 words)

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