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Topic: 1950 DA

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	1950 DA, extinctor
		The data on 1950 DA suggest it is travelling at a velocity of about 15 km per second relative to the Earth.
		Integration of the orbit of asteroid (29075) 1950 DA, based on radar and optical measurements spanning 51 years, reveals a 20-minute interval in March 2880 when there could be a non-negligible probability of the 1-kilometer object colliding with Earth.
		Currently, 1950 DA has been rated as a level two event on the Torino warning scale, which means it is an event "meriting concern".
	www.geocities.com /blobrana/features/1950da.html (2130 words)

	1950 DA - Wikipedia
		Dezember 2000 wurde das Objekt von der Himmelsüberwachung LONEOS wiederentdeckt und erhielt zwischenzeitlich die provisorische Bezeichnung 2000 YK bis festgestellt wurde, dass es sich um 1950 DA handelte.
		1950 DA war mit 0,17 das erste Objekt, für das ein Wert größer als Null auf der Palermo-Skala ermittelt wurde.
		Die Radarbeobachtungen zeigen auch, dass es sich bei 1950 DA um ein nahezu kugelförmiges Objekt mit einem Durchmesser von 1,1 Kilometer handelt.
	de.wikipedia.org /wiki/1950_DA (206 words)

	News Article: Possible Impact in 2880 (Site not responding. Last check: 2007-11-07)
		If future generations' studies of 1950 DA indicate it ought to be diverted to prevent a collision, the subtle influences that its physical properties have on its motion might be manipulated to advantage.
		ON 1950 DA This case of 1950 DA is rich in the sense of there being many different aspects to it.
		The case especially illustrates the value of planetary radar; 1950 DA's impact potential was detected when the asteroid's position and velocity were measured by Goldstone at the 10's of meters and millimeter per second level.
	nai.arc.nasa.gov /impact/news_detail.cfm?ID=111 (3309 words)

	BBC NEWS \| Science/Nature \| Asteroid could hit Earth in 2880
		The calculations indicate that 1950 DA will have its closest pass to Earth on 16 March, 2880 - how close has still to be determined.
		The data on 1950 DA suggest it is travelling at a velocity of about 15 km (nine miles) per second relative to the Earth.
		Given the relatively small size of 1950 DA and the 878 years' advance warning, it would be possible to alter the orbit of the object if it was considered necessary.
	news.bbc.co.uk /hi/english/sci/tech/newsid_1910000/1910518.stm (677 words)

	Fall 2001 - Q&A and Calendar of Events
		Jon Giorgini: An asteroid designated 1950 DA, first discovered by [C. Wirtanen] in February of 1950, was recently rediscovered, having been lost for the last half century.
		In it, references are made to a computer named "DA" and to "celestial objects passing by the Earth." Neither reference is in the original 1932 novel.
		It seems quite plausible that some alert person, upon reading a news item about 1950 DA, might have thought of the old novel In that case, he was way ahead of the astronomers, who were not thinking in those terms at all.
	www.mira.org /newsletr/nlfall02/pg2.htm (693 words)

	There's A Rock Headed Our Way
		The rating given to 1950 DA (+0.17) indicates that the risk of it hitting Earth is about 47.9% greater than the expected statistical average chance of being hit by an asteroid or comet.
		There is a 99 and 2/3rds percent chance that (29075) 1950 DA is going to pass a couple hundred thousand miles from Earth and not, repeat, not, enter our atmosphere, crash into water or land, and cause havoc and disaster.
		For an object such as 1950 DA that has a highly inclined orbit, that means that the sun's gravity has an almost negligibly different tug at different parts of the asteroid's orbit.
	www.spacedaily.com /news/deepimpact-02f.html (1852 words)

	New Scientist Breaking News - Asteroid forecast has good and bad news
		Asteroid 1950 DA is an exception to the rule that asteroid orbits can be predicted for only about 100 years.
		1950 DA is also in a gravitational resonance with the Earth, circling the Sun five times for every 11 Earth orbits.
		Giorgini says 1950 DA "could be redirected by spreading chalk or charcoal across the surface, or by sending a solar sail spacecraft that collapses around the asteroid and sort of shrink-wraps it".
	www.newscientist.com /article.ns?id=dn2130 (558 words)

	SPACE.com -- The Lucky Case of Potentially Deadly Asteroid 1950 DA
		Deflecting 1950 DA How the Sun's energy could be harnessed to nudge the asteroid off course.
		Asteroid 1950 DA might or might not hit Earth in the year 2880, according to a report that will appear in the April 4 issue of the journal Science.
		Either way, 1950 DA represents a unique situation in which time and luck have combined to allow more precise projections of a potentially threatening asteroid's future than ever before.
	www.space.com /scienceastronomy/solarsystem/asteroid_1950da_020404.html (1046 words)

	Meteorites (Site not responding. Last check: 2007-11-07)
		Asteroid 1950 DA In April 2002, astronomers re-observed an asteroid, called Asteroid 1950 DA, which was discovered in 1950.
		You can find a number of reports on the web: here are links to reports on 1950 DA from Sky and Telescope; the BBC; ABC news; CBS news; and Newsday.
		1950 DA is 1.1 km in diameter; were it to hit the Earth it would cause major damage.
	www.ess.sunysb.edu /fwalter/AST101/meteorites.html (678 words)

	Asteroid 1950 DA (Site not responding. Last check: 2007-11-07)
		Asteroid 1950 DA, was the first piece of rogue rock orbiting within our Sun's grasp, that we as a species noticed could one day, all most definitely, destroy all species on Earth.
		Because 1950 DA is quite large -- more than 1 kilometer (0.6 miles) across -- the consequences would be catastrophic on a Global scale, because of all its kinetic energy; it is traveling at around 30,000 km PER SECOND.
		Asteroid 1950 DA, is a kilometer across but it is only a baby compared to some out there on the space debris super highway.
	www.thesahara.net /asteroid_1950_DA.htm (1984 words)

	USATODAY.com - Large asteroid could hit the Earth — in 878 years (Site not responding. Last check: 2007-11-07)
		A new look at an asteroid named 1950 DA shows that it is the most likely of all of the known asteroids at least six-tenths of a mile wide to smash into the Earth, researchers said Thursday in the journal Science.
		Asteroid 1950 DA was first discovered on Feb. 23, 1950, but then not noted in astronomy logs again for decades.
		From that, the astronomers projected the orbital path 1950 DA would take on its next 15 near passes of the Earth —; over a period covering nearly nine centuries.
	www.usatoday.com /news/science/2002-04-04-asteroid.htm (752 words)

	Huge asteroid could hit Earth - in 29th Century
		Named 1950 DA, the asteroid -- six-tenths of a mile wide -- is the most threatening to the Earth of all of the known large asteroids, but the odds are only about one in 300 that it would hit the planet, researchers said.
		If 1950 DA did hit the Earth, said Giorgini, it would have planetwide effects, setting off fires, changing the weather and perhaps creating immense tidal waves.
		If scientists determine in the coming centuries that 1950 DA does represent a threat, he said, there'll be plenty of time to act.
	www.freep.com /news/nw/aster5_20020405.htm (437 words)

	Asteroid Might Hit Earth In 2880, Unless it is Painted (Site not responding. Last check: 2007-11-07)
		The result: 1950 DA currently has at most a 1-in-300 chance of hitting Earth on March 16, 2880.
		Because 1950 DA is large -- more than 1 kilometer (0.6 miles) across -- the consequences would be grave and global.
		So we say the collision probability of 1950 DA is either near the maximum of 1-in-300 or near zero.
	www.spsnational.org /hotscience/article2.htm (1252 words)

	SPACE.com -- Catch the Wave: Asteroid-driven Tsunami in U.S. Eastern Seaboard's Future
		On March 16, 2880 the Earth's Atlantic Ocean is turned toward 1950 DA, and with 70-percent of the Earth covered in water an ocean impact would be the most likely to model.
		In the simulation, 1950 DA slams into the Atlantic Ocean about 360 miles (579 kilometer) off the eastern coast of the United States.
		1950 DA is one of the larger asteroids that astronomers worry might hit the Earth.
	www.space.com /scienceastronomy/tsunami_asteroid_030602.html (807 words)

	Scientific American: Asteroid Impact Possible in 2880, Astronomers Conclude (Site not responding. Last check: 2007-11-07)
		Giorgini of the California Institute of Technology and colleagues used radar and optical measurements made during 1950 DA's two appearances to determine the trajectory of its orbit, as well as the likelihood of an impact with Earth.
		The most recent opportunity to track the asteroid's journey will not be the last: 1950 DA will be observable again in 2032 and several times thereafter.
		For example, Spitale proposes that controlled explosions on the surface of 1950 DA could change the absorption and radiation of energy, thus altering the Yarkovsky effect and shifting the asteroid's path.
	www.sciam.com /print_version.cfm?articleID=000EAB17-08AE-1CD0-B4A8809EC588EEDF (348 words)

	Threatening Asteroid Aids Planetary Prognosticators
		Astronomers at Lowell Observatory rediscovered the wayward object, known as 1950 DA, by accident on New Year's Eve 2000, and three months later teams of radar astronomers pinged it from Goldstone, California, and Arecibo, Puerto Rico.
		When orbital dynamicists combined the high-precision radar tracks with the half-century-long photographic record, they realized that 1950 DA is likely to make three close brushes with Earth in the centuries ahead.
		For 1950 DA (now officially numbered 29075), knowing the spin direction is crucial: if it's prograde, like Earth's, then the chance of a collision in 2880 remains as high as 0.3 percent; if it's "retrograde," like Venus, then a direct hit can't possibly occur.
	newton.uor.edu /FacultyFolder/tyler_nordgren/SP2002/article_570.htm (659 words)

	Could asteroid hit in 2880? - Science Mysteries - MSNBC.com (Site not responding. Last check: 2007-11-07)
		1950 DA also returns to the same position relative to Earth every few years, subjecting itself to Earth’s gravity at the same point in its orbit.
		Based on their record of the asteroid’s orbit thus far, and the likely gravitational effects of a handful of other large objects in the solar system, Giorgini and his colleagues projected 1950 DA’s orbital path out to 2880, where they found a 20-minute window during which a collision with Earth may be possible.
		In each case, the primary effect was to cause 1950 DA to either speed up or slow down along its orbital path, as if it were a train on a track.
	msnbc.msn.com /id/3077460 (998 words)

	asteroid 29075 1950 DA (Site not responding. Last check: 2007-11-07)
		1950 DA was discovered on 23 Feb. 1950 at Lick Observatory by Carl A. Wirtanen.
		During the Asteroids 2001 conference, held 11-16 June 2001 in Palermo, Italy, Jon Giorgini led a team of writers in making a poster presentation on "Asteroid 1950 DA: Long term prediction of its Earth close approaches" (abstract DOC file), reporting March 2001 radar observations and projecting a close-call for the Earth in the year 2880.
		29075 1950 DA was back in the news again in Spring 2003 when it was used as an example of what the authors of a scientific paper predict would happen if a large asteroid fell into the Atlantic ocean.
	www.hohmanntransfer.com /cgi-bin/get.cgi?num=29075 (577 words)

	CBC News:Warning to earthlings for March 16, 2880 – Duck! (Site not responding. Last check: 2007-11-07)
		The one-kilometre asteroid 1950 DA is the only one they've found so far.
		Asteroid 1950 DA was discovered on Feb. 23, 1950, but then astronomers lost track of it until March 2001, when Giorgini and his team were able to gather visual and radar readings.
		The paper concludes a space mission to the asteroid might be needed to precisely measure the asteroid's distance from Earth.
	www.cbc.ca /stories/2002/04/05/asteroid020405 (388 words)

	WorldNetDaily: Could an asteroid doom Earth? (Site not responding. Last check: 2007-11-07)
		The asteroid, "1950 DA," is the most threatening to Earth of all of the known large asteroids, though the odds are only about one in 300 that it would impact the planet.
		So if future generations determine the risk is increasing based on new information, they could simply coat the surface of 1950 DA with chalk or charcoal, or send a solar sail spacecraft mission that ends by running into the asteroid and collapsing around it – sort of like shrink-wrapping it.
		A: Something the size of 1950 DA (1.1 kilometers) moving at its encounter velocity of 14.25 kilometers per second would have 100,000 megatons of energy to dissipate upon impact.
	www.worldnetdaily.com /news/article.asp?ARTICLE_ID=27208 (1563 words)

	[No title]
		The orbit of 1950 DA (asteroid 29075) discovered 1950feb23 by C. Wirtanen.
		The most threatening object yet found is 1950 DA which was first discovered 1950feb23 and lost, but was recovered on 2000dec31 (last evening of the 20th century by the precise definition).
		The risk from 1950 DA given its chance of hitting and its size is thought to be greater than the combined risk by all other known asteroids through to 2880.
	www.physics.unlv.edu /~jeffery/astro/asteroid/asteroid.html (1560 words)

	Asteroid impact scenario
		March 16, 2880, is the day the asteroid known as 1950 DA, a huge rock two-thirds of a mile in diameter, is due to swing so close to Earth it could slam into the Atlantic Ocean at 38,000 miles per hour.
		Asteroids the size of 1950 DA have probably struck the Earth about 600 times since the age of the dinosaurs," Ward said.
		Although the probability of an impact from 1950 DA is only about 0.3 percent, it is the only asteroid yet detected that scientists cannot entirely dismiss as a threat.
	currents.ucsc.edu /02-03/06-02/tsunami.html (1223 words)

	Cadernos Eletrônicos da Pós (Site not responding. Last check: 2007-11-07)
		O papel das universidades americanas na pesquisa e experimentação destes novos tipos de estrutura vai também contribuir ao seu desenvolvimento, os estudantes tendo aí uma participação significativa.
		Barras separadas para ligar as pontas das pirâmides
		Entre as vantagens que apresentam estas estruturas para a industrialização da construção podemos citar sua leveza, sua mobilidade, a evolução de suas formas, sua hiperestaticidade nas provas mecânicas, sísmicas e térmicas, assim como a facilidade de fabricação, de montagem das peças, de estocagem e de transporte.
	www.unb.br /fau/pos_graduacao/cadernos_eletronicos/estruturas_espaciais/estruturas.htm (6055 words)

	Doylestown Patriot - News - 02/03/2005 - Paint job for an asteroid
		That's the prediction of space experts who have been watching 1950 DA for a long while, and never once lost it, to my knowledge.
		The name 1950 DA comes from the fact that the asteroid was first noticed in 1950.
		Thoughts of sending a spacecraft full of explosives to give 1950 DA a shove, and change its direction, have been expressed by experts.
	www.zwire.com /site/news.cfm?BRD=1685&dept_id=45240&newsid=13883770&PAG=461&rfi=9 (488 words)

	Near-Earth object - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-11-07)
		Currently, the only other known NEO with a Palermo scale value greater than zero is (29075) 1950 DA, which is predicted to pass very close to or collide with the Earth (p≤0.003) in the year 2880.
		If this collision were to happen, the energy released by a collision with (29075) 1950 DA would cause an Extinction event which would destroy most life on the planet.
		However, humanity has over 800 years to refine its estimates of the orbit of (29075) 1950 DA, and to deflect it if necessary.
	www.bucyrus.us /project/wikipedia/index.php/Near-Earth_object (668 words)

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