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Topic: 2004 VD17

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	2004 VD17
		Based on observations available at the time, 2004 VD17 was estimated to have a 1 in 1600 chance of striking the Earth on May 4, 2102, and a 1 in 500,000 chance of hitting two years later.
		The odds of a collision in 2102 have now been reduced to 1 in 63,000 and the asteroid's Torino rating to 1.
		2004 VD17 was discovered on Nov. 7, 2004 by the LINEAR asteroid survey.
	www.daviddarling.info /encyclopedia/A/2004_VD17.html (178 words)

	NEO Threat - Planetary News \| The Planetary Society
		The estimate is based on 691 observations of the asteroid, from November 7, 2004 to March 2, 2006.
		Orbital calculations indicate that the relative speed of 2004 VD17 at the time of impact would be 21.4 kilometers per second (13.3 miles per second).
		Because of the impact probability and the potential for widespread destruction, 2004 VD17 was assigned a value of 2 on the Torino scale, which measures the risk NEO's pose to Earth.
	www.planetary.org /news/2006/0303_Asteroid_Scores_2_on_Torino_Scale.html (389 words)

	News Article: Asteroid 2004 VD17 classed as Torino Scale 2 (Site not responding. Last check: 2007-10-23)
		At the end of February, orbital calculations for near-Earth-asteroid (NEA) 2004 VD17 indicated that the risk of an impact within the next century (specifically on May 4, 2102) was higher than that of any other known asteroid.
		Judging from its brightness, NEA 2004 VD17 has a nominal diameter near 500 m and a mass of nearly a billion tons.
		Fortunately, it is nearly a century before the 2102 possible hazard from NEA 2004 VD17.
	impact.arc.nasa.gov /news_detail.cfm?ID=167 (423 words)

	The Space Review: 2004 VD17, impact assessment scales, and a natural impact warning clearinghouse
		And languish 2004 VD17 does, despite the publication of potential precovery positions from 2002.
		For 2004 VD17 and the 2102 date, this “Purgatorio Ratio” (PR) is 0.014, increasing to 0.042 if one accepts the 2002 precovery observations and the 2102 threat continues to be valid.
		On the other hand, we do know for sure that 2004 VD17 will be within a million or two kilometers of the Earth on 2102 May 4, and that makes for a different situation.
	www.thespacereview.com /article/581/2 (1285 words)

	Space & Astronomy News - New asteroid top of Earth's hit list - 03/03/2006
		The rock, 2004 VD17, is about 500 metres long and has a mass of nearly a billion tonnes.
		VD17 was spotted in late November 2004 and was swiftly identified as a rock that potentially crosses Earth's orbit.
		VD17 was previously categorised as a grade green, which means merits careful watching, on the Torino scale of NEO hazards.
	www.abc.net.au /science/news/space/SpaceRepublish_1582984.htm (472 words)

	Asteroid 2004 VD17 Classed as Torino Scale 2 \| SpaceRef - Space News as it Happens
		Asteroid 2004 VD17 Classed as Torino Scale 2
		For comparison, NEA Apophis (formerly 2004 MN4) is currently listed on the NEO webpage as Torino scale 1, with an impact probability on April 13, 2036, of about 1 part in 5000.
		Fortunately, it is nearly a century before the close pass from VD17.
	www.spaceref.com /news/viewsr.html?pid=19798 (799 words)

	Asteroid 2004 VD17 is upgraded to Torino Scale 2 - Forums powered by UBBThreads™ (Site not responding. Last check: 2007-10-23)
		New data in on 2004 VD17 has refined the trajectory knowledge with 472 days of observaton, and increased the risk scale further, and is now ranked at Torino Scale 2 for both JPL NEODYS and CLOMON.
		The rock, 2004 VD17, is about 500 metres (yards) long and has a mass of nearly a billion tonnes, which -- if it were to impact -- would deliver 10,000 megatonnes of energy, equivalent to all the world's nuclear weapons.
		Spotted on November 27 2004, VD 17 was swiftly identified as rock that potentially crossed Earth's orbit, with a 1 in 3,000 risk of collision on May 4 2102.
	uplink.space.com /showflat.php?Board=sciastro&Number=442646 (2285 words)

	A/CC's Consolidated Risk Tables
		2004 VD17 brightened into view in early Feb. 2006 and was picked up with the Spacewatch 1.8m telescope on 6 Feb. It remains in view until around June 22nd, then comes back again in late July for the rest of the year.
		On 27 Dec. 2004 it was reported in MPEC 2004-Y70 that 2004 MN4 had been found in images from the Spacewatch 0.9m telescope from March 15th, extending this object's observing arc by a very significant 96.060 days.
		2004 MN4 was observed by radar from Arecibo in Puerto Rico on 27, 29, and 30 Jan. and 7 Aug. 2005.
	www.hohmanntransfer.com /crt.htm#2006bq6 (4514 words)

	Asteroid to hit earth in 2102 - red-dawn.net
		On 23 February, new observations allowed researchers to more accurately calculate the orbit of the asteroid, named 2004 VD17, which was originally detected by the Massachusetts Institute of Technology's LINEAR project.
		The highest level ever reached by an asteroid was level 4 by Apophis (2004 MN4) in December 2004, but subsequent calculations downgraded that concern to a level 1.
		He also notes that VD17 is dim and distant and is not projected to pass close by the Earth before 2102.
	www.red-dawn.net /forums/index.php?showtopic=3569 (806 words)

	Astronomija
		Последните пресметки на орбиталните карактеристики на астероидот 2004 VD17, направени кон крајот на месец февруари оваа година, покажуваат дека шансите овој астероид да удри во Земјата во следниве 100 години се поголеми отколку што се мислеше до сега.
		Астероидот 2004 VD17 беше откриен на 7 ноември 2004, од системот LINEAR.
		За сега, 2004 VD17 и Апофис (порано познат под ознаката 2004 MN4) се единствените астероиди кои на TORINO скалата имаат ознака поголема од 0.
	www.astronomija.com.mk /vest.asp?id=799 (274 words)

	The Telegraph - Calcutta : International
		Spotted on November 27, 2004, VD17 was swiftly identified as a rock that potentially crossed Earth’s orbit, with a 1 in 3,000 risk of collision on May 4, 2102.
		This should provide ample time to refine the orbit and, most probably, determine that the asteroid will miss the earth.”; VD17, which was previously categorised as a grade green (“merits careful watching”) on the Torino scale of neo hazards, has been upgraded to grade yellow, “meriting attention”.
		The Torino Scale is a method for categorising the impact hazard associated with near-Earth objects such as asteroids and comets.
	www.telegraphindia.com /1060304/asp/foreign/story_5924494.asp (316 words)

	2004 VD17 (Site not responding. Last check: 2007-10-23)
		2004 VD17 (also written 2004 VD17) is a near-Earth asteroid with a low but non-zero probability of impacting Earth in 2102.
		2004 VD17 was discovered on November 7, 2004 by the NASA-funded LINEAR asteroid survey.
		The object is estimated at 500-1,200 metres in diameter.
	www.vd17.org (235 words)

	Planetary Society Blog article on 2004 VD17 - Unmanned Spaceflight.com
		In case there is anyone here who doesn't keep an eye on Emily's TPS Blog she has just posted an excellent blog entry on 2004 VD17, an asteroid that currently holds the distinction of having the highest Torino scale rating (2) of any known object.
		...she has just posted an excellent blog entry on 2004 VD17, an asteroid that currently holds the distinction of having the highest Torino scale rating (2) of any known object.
		Apophis (2004 MN4) is the one to watch, because its first close approach is coming up much sooner, in 30 years (2036) -- which is I think a comfortable amount of lead time to actually develop some nifty program combining a long baseline of Earth observations with some little mission.
	www.unmannedspaceflight.com /index.php?showtopic=2343 (531 words)

	2004 VD17 at AllExperts
		was discovered on November 7, 2004 by the NASA-funded LINEAR asteroid survey.
		has led the Earth-impact hazard list since November 22, 2004, supplanted for a few days in late December 2004 by 99942 Apophis (then known only by its provisional designation) which was briefly rated 4 on the Torino Scale.
		On March 20, 2006, 's observation arc increased from 487 to 1,482 days because of additional reporting of positions from February 16, 2002, while observations on May 20, 2006 increased the observation arc to 1,553 days and lowered its Torino scale to level 1.
	en.allexperts.com /e/0/2004_vd17.htm (342 words)

	Flashespace.com - Un astéroïde classé 2 sur l'Echelle de Turin
		L'astéroïde 2004 VD17 a été classé 2 sur l'Echelle de Turin, qui vise à quantifier les risques posés par des astéroïdes et autres comètes susceptibles de percuter la Terre.
		D'après les observations menées depuis le sol, 2004 VD17 aurait un diamètre d'environ 500 mètres et serait d'une masse d'environ 1 milliard de tonnes.
		Apophis et 2004 VD17 sont les deux seuls objets classés au-delà de 0 sur l'Echelle de Turin.
	www.flashespace.com /html/mars06/03_03.htm (450 words)

	www.ufo.com.ua - 2006 - Астероид NEA 2004 VD17 может столкнуться с Землей в 2102 ...
		Астероид NEA 2004 VD17, который был открыт в 2004 г., на днях получил самый высокий рейтинг опасности среди известных астероидов, которые в обозримом будущем могут пролететь в непосредственной близости от Земли или даже столкнуться с ней.
		2004 VD17 и Apophis - это единственные астероиды, которые по Туринской шкале имеют рейтинг выше 0.
		К тому же, дальнейшие наблюдения за астероидом NEA 2004 VD17 могут показать, что он успешно пролетит мимо Земли.
	www.ufo.com.ua /articles/1141395160224 (239 words)

	PLANETKY.cz
		Hlavním podezřelým je blízkozemní asteroid známý pod označením 2004 VD17.
		Tím je asteroid Apophis, který ještě pod předběžným označením 2004 MN4 dosáhl v prosinci 2004 stupně 4.
		Naopak, 2004 VD17 je vhodným příkladem pro sledování práce astronomů a náročnosti výpočtu CO MOŽNÁ NEJPŘESNĚJŠÍCH DRAH blízkozemních asteroidů.
	www.planetky.cz /article.php3?sid=169&mode=thread&order=0&thold=0 (430 words)

	Dec. '04 stack 1, Major News about Minor Objects
		Today's JPL 2004 XK3 risk assessment is very similar to that from two days ago, on the 7th, with ratings that are low but higher than yesterday's.
		Risk monitoring: JPL has posted 2004 XO, the discovery of which was announced today in MPEC 2004-X08, found early yesterday by the Catalina Sky Survey and confirmed overnight from five other observing facilities.
		There are 2004 VD17 observations in today's DOU from yesterday morning from Robert Hutsebaut with Rent-A-Scope at New Mexico Skies and early today from Great Shefford Observatory in England.
	www.hohmanntransfer.com /mn/0412/stak1.htm (3131 words)

	THINGS TO WORRY ABOUT (Site not responding. Last check: 2007-10-23)
		The diameter of 2005 WY55 is estimated at between 210 and 480 meters.
		On May 4, 2102, the asteroid 2004 VD17 will strike the earth with a probability of about 1:1600.
		2004 VD17 is about 580 m in diameter, with a mass estimated at 2.7×10
	www.usna.edu /Users/math/meh/worry.html (260 words)

	Millennium Ark: Hot News
		That is, in short, how one could sum up the latest developments in the saga of asteroid 2004 VD17.
		In case of 2004 VD17, we know that there is absolutely no problem about getting future data.
		I hope that the mess over 2004 VD17 will convince more members of the NEO community that the current risk communication system isn’t working properly and thus in urgent need of modification and improvement.
	www.millennium-ark.net /NEWS/06_Space/060322.asteroid.2004.VD17.html (1826 words)

	WorldChanging: Tools, Models and Ideas for Building a Bright Green Future: Torino 2, and Counting
		It's extraordinarily rare for further refinement to increase the measured risk; the last time this happened was with asteroid 2004 MN4, which is now estimated to miss the Earth by a whisker in 2029.
		Given that VD17 is three times the size of the one used for the gravity tugboat idea, it would need both a bigger space craft and more time.
		Based on the Asteroid Impact Effects page at the University of Arizona, if VD17 was an otherwise typical dense rock asteroid, it would hit the ground with an impact equivalent of a 10 gigaton nuclear bomb, knocking down buildings a hundred or more kilometers away, and leaving a 9 kilometer-wide crater.
	www.worldchanging.com /archives/004162.html (2116 words)

	EL MOUDJAHID - QUOTIDIEN NATIONAL D'INFORMATION (Site not responding. Last check: 2007-10-23)
		L’astéroïde, baptisé 2004 VD17, mesure 500 mètres de long et pèse un milliard de tonnes.
		Le danger potentiel présenté par l’astéroïde avait été rapidement perçu après sa découverte le 27 novembre 2004.
		2004 VD17 devient ainsi l’astéroïde le plus susceptible d’entrer en collision avec la Terre, dans un scénario maintes fois abordé par les ouvrages de science-fiction.
	www.elmoudjahid.com /stories.php?story=06/03/03/6718269 (480 words)

	۞ 2004 VD17 - Infos und Erklärungen auf Astronomie.naturToday.de (Site not responding. Last check: 2007-10-23)
		November 2004 durch die automatische Himmelsüberwachung LINEAR (Lincoln Near Earth Asteroid Research) entdeckt wurde.
		2004 VD ist allerdings erst der zweite Asteroid, der auf einen Wert von über 1 auf der Torinoskala eingestuft wurde.
		November 2004 ist 2004 VD das erdnahe Objekt mit dem höchsten bekannten Einschlagsrisiko in den nächsten Jahrzehnten.
	astronomie.naturtoday.de /2004_VD17 (733 words)

	Technobytes, The News International
		The highest level ever reached by an asteroid was level four by Apophis (2004 MN4) in December 2004, but subsequent calculations downgraded that concern to a level one.
		Based on current observations, he says the asteroid has a one in 1600 chance of striking the Earth in 2102 and a one in 500,000 chance of hitting two years later.
		NEO hunter, Andrea Milani Comparetti of the University of Pisa, Italy, says VD17 "is a serious problem, but not for our generation." He also notes that VD17 is dim and distant and is not projected to pass close by the Earth before 2102.
	jang.com.pk /thenews/mar2006-weekly/techno-08-03-2006 (2825 words)

	(2004) VD17 - Savoir
		L'astéroïde 2004 VD a été découvert par LINEAR le 7 novembre 2004.
		Des observations montrent qu'il y a une probabilité de 1 sur 2 780 pour que 2004 VD entre en collision avec la Terre le 4 mai 2102.
		Ils furent tout les deux au niveau 1 de l'échelle de Turin pendant un moment, avant que 2004 VD soit réévalué au niveau 2 de cette échelle en mars 2006, la probabilité de collision pour le 4 mai 2102 étant de 1 sur 1000.
	savoir.pingouin.org /index.php/2004_VD17 (344 words)

	CCNet-16-03-2006
		This will of course lead to a further change in the computation of the random number (currently advertized as 1 in 1300) that is the 2102 impact probability--perhaps to the extent that the whole impact possibility will go away.
		For 2004 VD17 and the 2102 date, this Purgatorio Ratio is 0.014, increasing to 0.042 if one accepts the 2002 precovery observations and the 2102 threat continues to be valid.
		On the other hand, we do know for sure that 2004 VD17 will be within a million or two km of the earth on 2102 May 4, and that makes for a different situation.
	www.staff.livjm.ac.uk /spsbpeis/CCNet-16-03-06.htm (6341 words)

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