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Topic: (29075) 1950 DA

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	Asteroid 1950 DA
		Asteroid 1950 DA Asteroid 1950 DA Arecibo radar image of 1950 DA on 4 March 2001, from a distance of 0.052 AU.
		If it is eventually decided 1950 DA needs to be diverted, the hundreds of years of warning could allow a method as simple as dusting the surface of the asteroid with chalk or charcoal, or perhaps white glass beads, or sending a solar sail spacecraft that ends by collapsing its reflective sail around the asteroid.
		Initial 1950 DA results were first reported at the "Asteroids 2001: from Piazzi to the 3rd Millennium" conference in Palermo, Sicily June 11-16: J.D. Giorgini et al., "Asteroid 1950 DA: Long Term Prediction of its Earth Close Approaches" Asteroids 2001, Palermo, Italy, June 2001.
	neo.jpl.nasa.gov /1950da (1627 words)

	29075 1950 DA
		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.
		Images of 29075 1950 DA Arecibo radar image of 1950 DA on 4 March 2001, from a distance of 0.052 AU (22 lunar distances).
		Arecibo radar images of asteroid 1950 DA obtained during 48 minutes (37% of a rotation) on March 4, 2001.
	www.geocities.com /lipanovic/29075_1950da/29075_1950da.html (886 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 (1664 words)

	News Article: Possible Impact in 2880 (Site not responding. Last check: )
		Abstract: Integration of the orbit of asteroid (29075) 1950 DA, which is based on radar and optical measurements spanning 51 years, reveals a 20-minute interval in March 2880 when there could be a nonnegligible probability of the 1-kilometer object colliding with Earth.
		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.
		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.
	www.nai.arc.nasa.gov /impact/news_detail.cfm?ID=111 (3280 words)

	ipedia.com: (29075) 1950 DA Article (Site not responding. Last check: )
		1950 DA is an asteroid considered to be the near Earth object with the highest known likelihood of crashing into Earth.
		(29075) 1950 DA is an asteroid considered to be the near Earth object with the highest known likelihood of crashing into Earth.
		The asteroid was first discovered on February 23, 1950 by Carl A. Wirtanen; it was observed for 17 days and then faded from view for half a century.
	www.ipedia.com /_29075__1950_da.html (307 words)

	1950 DA
		(29075) 1950 DA ist ein Planetoid, der sowohl die Bahn der Erde als auch die des Mars kreuzt.
		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 Kilometern handelt.
	www.weblexikon.de /1950_DA.html (237 words)

	(29075) 1950 DA Information
		(29075) 1950 DA is an asteroid considered to be the near Earth object with the highest known probability of impacting Earth, according to the Palermo Technical Impact Hazard Scale.
		If 1950 DA continues on its present orbit, it will approach near to the Earth on March 16, 2880.
		The energy released by a collision with 1950 DA could cause major effects on the climate and biosphere which would be devastating to human civilization.
	www.bookrags.com /wiki/(29075)_1950_DA (367 words)

	(29075) 1950 DA at AllExperts
		(29075) 1950 DA Asteroid 1950 DA is an asteroid considered to be the near Earth object with the highest known probability of crashing into Earth, according to the Palermo Technical Impact Hazard Scale.
		Radar observations were made at the Goldstone and Arecibo Observatory from March 3 to 7, 2001 during the asteroid's 7.8 Gm approach to the Earth (a distance 21 times larger than that separating the Earth and Moon).
		The energy released by a collision with 1950 DA could cause an extinction event, destroying most life on the planet.
	en.allexperts.com /e/0/(29075)_1950_DA.htm (357 words)

	The asteroid (29075) 1950 DA
		The asteroid (29075) 1950 DA The asteroid (29075) 1950 DA - a potential impactor with the Earth
		Note: The following report includes some personal results on this topic.
		"Asteroid 1950 DA's encounter with Earth in 2880: Physical limits of collision probability prediction", Science, 296, p.
	math.ubbcluj.ro /~sberinde/thesis/impact.html (397 words)

	Cambridge Conference Correspondence
		change the prediction of 1950 DA unless adequate physical knowledge of it is
		sight during a break), when the case of 1950 DA was introduced at that time.
		Integration of the orbit of asteroid (29075) 1950 DA, which is based on
	abob.libs.uga.edu /bobk/ccc/cc041702.html (6706 words)

	SkyandTelescope.com - News from SkyandTelescope - Threatening Asteroid Aids Planetary Prognosticators
		A radar image of asteroid 29075 (1950 DA), acquired on March 4, 2001, from Arecibo observatory in Puerto Rico.
		Astronomers at Lowell Observatory rediscovered the wayward object, known as 1950 DA, by accident on New Year's Eve 2000, and three months later a team of radar astronomers pinged it from Goldstone, California, and Arecibo, Puerto Rico.
		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.
	skyandtelescope.com /news/current/article_567_1.asp (693 words)

	Threatening Asteroid Aids Planetary Prognosticators
		A radar image of asteroid 29075 (1950 DA), acquired on March 4, 2001, from Arecibo observatory in 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)

	Terraformers Society of Canada - Arjunas (Near Earth Asteroids)
		Although there have been a few false alarms, a number of asteroids are definitely known to be threats to the Earth.
		Asteroid (29075) 1950 DA was lost after its discovery in 1950 since not enough observations were made to allow plotting its orbit, and then rediscovered on December 31, 2000.
		(29075) 1950 DA has a diameter of a roughly kilometre.
	society.terraformers.ca /content/view/44/65 (1091 words)

	Archived Weblog Entry - 06/12/2003: "Asteroid (29075) 1950 DA: Houston, Do We Have a Problem?"
		According to NASA/JPL NEO PROGRAM, 1950 DA may be more than a casual close encounter.
		Scientific American's note on this states "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.
		From this research, the duo developed a computer simulation to investigate the effects an asteroid the size of 1950 DA (about two-thirds of a mile or one kilometer across) landing in the Atlantic about 360 miles (580 km) from the east coast of the United States.....
	www.llpoh.org /archives/00000323.html (641 words)

	Asteroid mining (Site not responding. Last check: )
		Although there have been a few false alarms, a number of asteroids are definitely known to be threats to the Earth.
		Asteroid (29075) 1950 DA was lost after its discovery in 1950 since not enough observations were made to allow plotting its orbit, and then rediscovered on December 31, 2000.
		(29075) 1950 DA has a diameter of a kilometre.
	www.pledgeco.com /techno/space-technology/asteroid-mining.htm (3647 words)

	This Day in Astro History: February
		But planetary conjunctions are rarely this close and Venus and Jupiter are the two brightest objects in the sky, after the sun and moon, a very pretty sky view indeed.
		Then, an object discovered on 31 December 2000 (New Year's Eve) was recognized as being the long-lost 1950 DA.
		1950 DA is the only known asteroid whose hazard could be above the background level.
	thisdayinastrohistory.com /thisday/thisdaytable2.htm (2038 words)

	1950 Encyclopedia (Site not responding. Last check: )
		1950 (MCML) was a common year starting on Sunday.
		June 29 - United States defeats England 1-0 in the 1950 FIFA World Cup.
		The 1950 Plan should have had a fairly low potential for distinctiveness...
	www.hallencyclopedia.com /topic/1950.html (3144 words)

	da.html (Site not responding. Last check: )
		Odds for a collision are at most one in 300, and probably even more remote, based on what is known about the asteroid so far.
		Still, that makes this object, named 1950 DA, a greater hazard than any other known asteroid.
		Radar images of asteroid 1950 DA obtained at Arecibo on Mar. 4, 2001, from a distance of 0.052 AU (22 lunar distances, eight million kilometers, five million miles):
	echo.jpl.nasa.gov /~ostro/da/index.html (181 words)

	Michael W. Busch
		I am currently working on the near-Earth asteroid 29075 (1950 DA), which was observed by radar and optical telescopes in 2001.
		To predict where an asteroid, such as 1950 DA, will be in a century to within a hundred thousand kilometers, we need to know the physical properties of the object in order to compute the magnitude of such things as the
		In the case of 99942 Apophis, the unknown physical properties of that object cause uncertainties in the trajectory which are drastically magnified by the 2029 close approach.
	www.gps.caltech.edu /~busch (1166 words)

	Armageddon Online - Near Earth Object - NEO / Asteroid - Possible Earth Impacts
		Currently, the only 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.armageddononline.org /content/view/100/49 (548 words)

	1950 DA (Site not responding. Last check: )
		1950 DA was discovered on 23 Febraury 1950 by C. Wirtanen at Lick Observatory.
		This old data contributed marginally to refine the orbit further and allowed Dr. Giorgini's team to calculate a maximum impact probability with the Earth for this date in 2880, which was rated about one in 300.
		Thanks to the very high orbital accuracy of 1950 DA, now numbered by the MPC as (29075), this is the first time that the possibility of a collision with the Earth is identified so far into the future.
	spaceguard.esa.int /SSystem/NEOCS/1950da.html (323 words)

	dan's blog
		Actually the most dangerous asteroid with the highest Palermo rating (+0.17) is (29075) 1950 DA which is also the only one known with an impact probability higher than 0.
		Simply because potential collision will be in year 2880 (16th March 2880, if you're curious) and that's too much in the future to start caring about (and to be sure about calculations).
		1950 DA is peculiar because it's trajectory is well know but probably there will be many new asteroids with similar impact rating until then.
	blog.linux.it /dan/real_world/2007/02/19/is-the-earth-going-to-be-destructed-soon-by-an-asteroid (454 words)

	The Space Review: 2004 VD17, impact assessment scales, and a natural impact warning clearinghouse (Site not responding. Last check: )
		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.
		Even the 0.042 value is smaller than the PRs of 0.062 for (99942) Apophis in 2036 and 0.063 for (29075) 1950 DA in 2880.
		1950 DA and Apophis currently have PP = 0.98 and 0.94, respectively.
	www.thespacereview.com /article/581/2 (1285 words)

	1950 - MoMA.org \| The Collection \| Jackson Pollock. One: Number 31, 1950 (Site not responding. Last check: )
		The Soviet view of the 1950 American intervention in the Korean War from Andrei Gromyko, the Deputy Minister of Foreign Affairs of the USSR.
		In the 1950's the DA (Ducks Ass), was the haircut of choice for the "cool" guys.
		Asteroid 1950 DA Arecibo radar image of 1950 DA on 4 March 2001, from a distance of 0.052 AU.
	justindexes.com /jsid/1950.html (1156 words)

	Time to prepare defences
		This whole subject may have a science-fiction feel to it, but it is a serious matter.
		Already a far-off asteroid - Asteroid (29075) 1950 DA - has been detected heading towards Earth.
		This 1.1km-diameter asteroid has a 0-0.33 per cent chance of hitting Earth in March 2880.
	www.universityscience.ie /pages/scimat_Time_to_prepare_asteroids.php (865 words)

	Could Trotter's plucky motor save the planet? - Space - RedOrbit
		And although the newly discovered asteroid that scared everyone earlier this month was quickly shown to be a false alarm, the "big one" with our name on it may already have been found, says Genge.
		Scientists got a long look at what was christened asteroid (29075) 1950DA - discovered in February 1950, then rediscovered in December 2000.
		"It is possible the countdown has already started with 1950 DA," he adds.
	www.redorbit.com /news/space/8687/could_trotters_plucky_motor_save_the_planet/index.html (697 words)

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