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Topic: (66391) 1999 KW4

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	Cornell Press Releases
		KW4, the astronomers say, is actually a pair of light, porous clusters of rubble that circle each other as they orbit from a point closer to the Sun than Mercury and then outward - occasionally passing very close to Earth along the way.
		KW4 is a valuable source of information for planetary scientists studying the formation and evolution of near-Earth asteroids - as well as for researchers studying how to mitigate the potential threat they pose to Earth.
		KW4 is classified as a Potentially Hazardous Asteroid, but data show that its path will not intersect Earth's for at least 1,000 years.
	www.news.cornell.edu /pressoffice1/Nov06/arecibo.asteroids.shtml (411 words)

	Astronomers Confirm Asteroid KW4 is No Threat to Earth -- at Least for a Thousand Years - Planetary News \| The ...
		KW4, the astronomers say, is actually a pair of light, porous clusters of rubble that circle each other as they orbit from a point closer to the Sun than Mercury and then outward -- occasionally passing very close to Earth along the way.
		The bodies were discovered in 1999, but not known to be binary until they were observed in May 2001, when they came to within 3 million miles of Earth -- this asteroid's closest pass until 2036.
		KW4 is a valuable source of information for planetary scientists studying the formation and evolution of near-Earth asteroids -- as well as for researchers studying how to mitigate the potential threat they pose to Earth.
	www.planetary.org /news/2006/1116_Astronomers_Confirm_Asteroid_KW4_is_No.html (451 words)

	Arecibo's double asteroid observations
		KW4, they say, is actually a pair of light, porous clusters of rubble that circle each other as they orbit from a point closer to the sun than Mercury and then outward -- occasionally passing very close to Earth along the way.
		The bodies were discovered in 1999 but were not known to be binary until they were observed in May 2001, when they came within about 2.98 million miles of Earth -- their closest pass until 2036.
		KW4 is a valuable source of information for planetary scientists studying the formation and evolution of NEAs -- as well as for researchers studying how to mitigate the potential threat they pose to Earth.
	www.news.cornell.edu /stories/Nov06/kw4.arecibo.html (713 words)

	Universe Today » Archive » Detailed Look at Twin Asteroid 1999 KW4 (Site not responding. Last check: 2007-10-20)
		KW4, they say, is actually a pair of light, porous clusters of rubble that circle each other as they orbit from a point closer to the sun than Mercury and then outward — occasionally passing very close to Earth along the way.
		The bodies were discovered in 1999 but were not known to be binary until they were observed in May 2001, when they came within about 2.98 million miles of Earth — their closest pass until 2036.
		KW4 is a valuable source of information for planetary scientists studying the formation and evolution of NEAs — as well as for researchers studying how to mitigate the potential threat they pose to Earth.
	www.universetoday.com /2006/11/16/detailed-look-at-twin-asteroid-1999-kw4 (759 words)

	Arecibo Observes Asteroid \| The Cornell Daily Sun
		Jean-Luc Margot, astronomy, made the most detailed observations to date of near-Earth asteroid (66391) 1999 KW4 (KW4), which is classified as a Potentially Hazardous Asteroid.
		KW4 is actually a binary system composed of a small asteroid orbiting a larger asteroid.
		Although the system was discovered in 1999, its twin nature was not known until 2001, when Margot and his colleagues observed it with the radar systems of Arecibo and NASA’s Goldstone Deep Space Network.
	www.cornellsun.com /node/20219 (626 words)

	First Detailed Pictures Of Asteroid Reveal Bizarre System
		The new results are scheduled to appear Oct. 12 in the journal Science in a pair of papers by Scheeres and Dr. Steven Ostro of the NASA/Caltech Jet Propulsion Laboratory.
		The radar images of asteroid KW4 (the official full designation is 66391 1999 KW4) were obtained in May 2001, when the asteroid passed 4.8 million kilometres from Earth.
		Based on the observations, the KW4 binary asteroid appears to have formed either from tidal disruption during a close pass by the Earth or from sunlight shining on it, so that it spins so fast that it eventually broke into two pieces.
	www.spacenewsfeed.co.uk /2006/15October2006_51.html (523 words)

	(66391) 1999 KW4 - Wikipedia, the free encyclopedia
		The correct title of this article is (66391) 1999 KW It features superscript or subscript characters that are substituted or omitted because of technical limitations.
		The moon, designated S/2001 (66391) 1 or '1999 KW4 Beta' is ~360 m in diameter, and orbits 1999 KW 'Alpha' in 0.758 d (16 hours) at a distance of 2.6 km.
		The shapes of the two bodies and their dynamics are complex [[1]].
	en.wikipedia.org /wiki/(66391)_1999_KW4 (237 words)

	KW4 Keeping its Distance, For Now :: Astrobiology Magazine ::
		Summary (Nov 19, 2006): The Arecibo Observatory has made new observations of a binary near-Earth asteroid named KW4.
		Some asteroids orbit with a partner and are considered binary while some even have mini planetary systems of their own.
		Asteroid impacts in our planet’s history were also a factor in the development and evolution of life, because such events had a profound affect on the environment and global ecosystem.
	www.astrobio.net /news/modules.php?op=modload&name=News&file=article&sid=2149 (547 words)

	(66391) 1999 KW4 - Free net encyclopedia (via CobWeb/3.1 planetlab1.tamu.edu) (Site not responding. Last check: 2007-10-20)
		Template:Downsize}} Template:Minor Planet Template:Mp (also written (66391) 1999 KW4) is an Aten and Mercury-crosser asteroid discovered by LINEAR in 1999.
		First, Template:Mp is one of the few asteroids whose orbit crosses that of Mercury, the innermost planet (another is 1566 Icarus).
		The moon, designated S/2001 (66391) 1 is only 360 m in diameter, and orbits Template:Mp in 0.758 d (16 hours) at a distance of 2.6 km and a leisurely speed of 0.25 m/s (0.9 km/h).
	www.netipedia.com.cob-web.org:8888 /index.php/S/2001_(66391)_1 (267 words)

	Arecibo eliminates one threat, but faces another - The Planetary Society Blog \| The Planetary Society
		There's a new news story on the site on how a near-Earth asteroid named (66391) 1999 KW4 is no longer considered to be a threat to Earth, at least for the next thousand years.
		It's based on an article released online at Science Magazine, by Steve Ostro and a pile of coauthors: "Radar Imaging of Binary Near-Earth Asteroid (66391) 1999 KW4." The full paper is available for free from Ostro's asteroid radar research website.
		In a nutshell, in 2001, Ostro et al used the giant Arecibo observatory in Puerto Rico and the Goldstone antenna in California to image KW4 and find it to be a binary.
	www.planetary.org /blog/article/00000773 (724 words)

	First detailed pictures of asteroid reveal bizarre system
		Previously, KW4 was classified as a potentially hazardous asteroid (PHA) because of the proximity of the asteroid's orbit to Earth's orbit.
		The new observations show that there is no chance of KW4 hitting Earth within at least the next 1,000 years, Scheeres said.
		The observations show that the larger object is spinning in its orbit so fast that it has been flattened into a kind of flying saucer shape, said Scheeres.
	newspick.net /news/2558 (306 words)

	(66391) 1999 KW4 - Wikipédia
		En raison de limitations techniques, la typographie souhaitable du titre, « (66391) 1999 KW », n'a pu être restituée correctement ci-dessus.
		(66391) 1999 KW est un astéroïde Aten et herméocroiseur découvert par LINEAR le 20 mai 1999.
		1999 KW possède une petite lune, designée S/2001 (66391) 1 ou 1999 KW Bêta ('Alpha' désignant l'objet le plus grand), qui fait environ 360 m de diamètre, et orbite autour de 1999 KW en 0,758 d (16 heures) à une distance de 2,6 km.
	fr.wikipedia.org /wiki/(66391)_1999_KW4 (697 words)

	News Article: Arecibo Radar Threatened & Possible Human Flights to NEAs (Site not responding. Last check: 2007-10-20)
		Below are two reports, one on radar studies at Arecibo of binary asteroid 1999 KW4, the other on NASA planning for possible human visits to NEAs as part of the Space Exploration Vision.
		The report on Arecibo radar studies of 1999 KW4 comes at a difficult time, when a senior review at NSF has recommended closing the Arecibo facility within the next five years.
		This is especially ominous for radar studies of NEAs, which were not evaluated by the review panel.
	impact.arc.nasa.gov /news_detail.cfm?ID=169 (2163 words)

	[No title]
		Dynamical simulations of the coupled rotational and orbital dynamics of binary near-Earth asteroid (66391) 1999 KW4 suggest that it is excited due to perturbations from the sun during perihelion passages.
		The primary's proximity to its rotational stability limit suggests an origin from spin-up and disruption of a loosely bound precursor within the past million years.
		The ~1.5-km-diameter primary (Alpha) is an unconsolidated gravitational aggregate with spin period ~ 2.8 h, bulk density ~2 g cm(-3), porosity ~ 50%, and an oblate shape dominated by an equatorial ridge at the object's potential energy minimum.
	comparative.lib.bioinfo.pl /auth:Scheeres,DJ (1753 words)

	Spaceflight Now \| Breaking News \| Astronomers confirm asteroid 'KW4' is not a threat to Earth
		Spaceflight Now \| Breaking News \| Astronomers confirm asteroid 'KW4' is not a threat to Earth
		Some of the initial pictures and data from NASA's Mars Reconnaissance Orbiter since the craft entered its mapping orbit around the Red Planet are presented in this news briefing held October 16 from the Jet Propulsion Laboratory.
		Astronomers confirm asteroid 'KW4' is not a threat to Earth
	www.spaceflightnow.com /news/n0611/15kw4 (864 words)

	1999 ap chemistry exam answers
		Nieuwendyk was a star among the Stars in 1999 - San Jose Mercury News
		Nieuwendyk was a star among the Stars in 1999
		The total net worth of all Canadian families climbed 41.7 per cent between 1999 and 2005 -- mainly because of a robust economy, a strong real estate market and...
	freesearcharticles.com /.../aps/1999_ap_chemistry_exam_answers.html (262 words)

	First detailed pictures of asteroid reveal bizarre system
		The first detailed images of a binary asteroid system reveal a bizarre world where the highest points on the surface actually are the lowest, and the two asteroids dance in each other's gravitational pull.
		The new observations show that there is no chance of KW4 hitting Earth within at least the next 1,000 years, Scheeres says.
		The observations show that the larger object is spinning in its orbit so fast that it has been flattened into a kind of flying saucer shape, Scheeres says.
	www.umich.edu /~urecord/0607/Oct16_06/21.shtml (568 words)

	CNews: "Зияющие высоты" обнаружены на астероиде
		Изображения поверхности астероида 66391 1999 KW4, полученные методами радарной съемки, выявили весьма необычную картину - образное выражение советского философа
		Астероид 66391 1999 KW4, представляющий собой тесную двойную систему, первоначально считался потенциально опасным для Земли, однако детальные изучения его траектории, проведенные в ходе его сближения с нашей планетой в мае 2001 года на расстояние 4,8 млн.
		По мнению ученых, двойная система 66391 1999 KW4 могла образоваться из единого целого либо под действием приливных возмущений при близком сближении с Землей в прошлом, либо под действием раскрутки вследствие давления солнечного излучения.
	www.cnews.ru /news/line/index.shtml?2006/10/12/213729 (143 words)

	Scheeres DJ - Últimos artículos en medline
		Dynamical configuration of binary near-Earth asteroid (66391) 1999 KW4.
		Radar imaging of binary near-Earth asteroid (66391) 1999 KW4.
		Mass and local topography measurements of Itokawa by Hayabusa.
	www.galenicom.com /medline/author/Scheeres+DJ (142 words)

	ScienceDaily: First Detailed Pictures Of Asteroid Reveal Bizarre System
		Floating Pile Of Rubble A Pristine Record Of Solar System's History (June 2, 2006) -- A small, near-Earth asteroid named Itokawa is just a pile of floating rubble, probably created from the breakup of an ancient planet, according to a University of Michigan researcher who was part of...
		Astronomers Sight An Asteroid's Moon (October 7, 1999) -- Astronomers this week announced their discovery of a moon orbiting an asteroid, in the first images ever obtained of such an object from Earth.
		Astronomer Discovers New Asteroid Between Mars And Jupiter (October 21, 1999) -- Texas A&M University astronomer Don Carona and his colleagues at Stephen F. Austin State University (SFA) have discovered an asteroid orbiting the sun more than 200 million miles from Earth between...
	www.sciencedaily.com /releases/2006/10/061012184307.htm (1744 words)

	(66391) 1999 KW4
		Primary discovered 20 May 1999 by the LINEAR program, Lincoln Laboratory ETS, Socorro, New Mexico, USA, but linked to prediscovery observations from 1998.
		CBA Belgium Observatory Observations of Near Earth Object 1999 KW4.
		Near-Earth Asteroid 1999 KW4 is a Binary System.
	pages.prodigy.net /wrjohnston/astro/astmoons/am-66391.html (326 words)

	Coelum Astronomia - News - Ultime Notizie di Astronomia
		Grazie al satellite Swift gli astronomi osservano l'accensione record di due supernovae nella stessa galassia a distanza di meno di cinque mesi l'una dall'altra.
		I radiotelescopi di Arecibo e Goldstone sono stati puntati sull'asteroide (66391) 1999 KW4 e hanno permesso di tracciare un accurato modello tridimensionale di questo potenziale proiettile cosmico.
		In un recente studio vengono analizzate e discusse alcune tracce lasciate da possibili recenti eruzioni di gas sulla superficie del nostro satellite.
	www.coelum.com /index.php?goto=news&nva=2006&nvm=11&id=323 (380 words)

	Asteroide doble 1999 KW4 observado con gran detalle desde Arecibo - Axxón - Garrafex News
		Asteroide doble 1999 KW4 observado con gran detalle desde Arecibo - Axxón - Garrafex News
		Asteroide doble 1999 KW4 observado con gran detalle desde Arecibo
		Un grupo de investigadores, utilizando la poderosa antena del radioobservatorio de Arecibo como radar, consiguió realizar las más detalladas observaciones, hasta la fecha, de un asteroide binario que se aproxima a la Tierra (66391) 1999 KW4.
	axxon.com.ar /not/168/c-1680113.htm (496 words)

	NEA's
		1999 CV 2006 8 7.000 I 12.7 AU 25.4J 88 DIJ Sint Annen 1999 CV 2006 8 5.997 I 12.6 AU 25.4J 88 BOU Sint Annen
		1999 CU 2003 9 24.853 I 14.0 HS 31.0J 143 DIJ Lauwersoog 1999 CU 2003 9 24.851 I 13.8 HS 31.0J 143 BOU Lauwersoog 1999 CU 2003 9 23.850 I 13.9: HS 25.4J 143 DIJ Noorddijk 1999 CU 2003 9 23.847 I 13.9 HS 25.4J 143 BOU Noorddijk
		1999 KW 2001 5 26.000 I 10.9 TJ 31.0J 72 BOU Sint Annen 1999 KW 2001 5 25.958 I 11.0 TJ 31.0J 72 DIJ Sint Annen 1999 KW 2001 5 25.956 I 10.9 TJ 31.0J 72 BOU Sint Annen
	www.shopplaza.nl /astro/cometobs/NEAS.HTM (2304 words)

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