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Topic: 2004 MN4

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	(99942) 2004 MNâ - Wikipedia, the free encyclopedia
		2004 MN was discovered on June 19, 2004, by Roy Tucker, David J. Tholen, and Fabrizio Bernardi of the NASA -funded University of Hawaii Asteroid Survey from Kitt Peak National Observatory in Arizona.
		Combined with its size, this caused 2004 MN to be assessed at level four out of ten on the Torino Impact Hazard Scale and 1.10 on the Palermo scale, scales scientists use to represent the danger of an asteroid hitting Earth.
		As of January 15, 2005, the cumulative Palermo scale rating for 2004 MN is â’1.59 and the Torino scale rating is 1.
	en.wikipedia.org /wiki/2004_MN4 (1661 words)

	SPACE.com -- Asteroid With Chance of Hitting Earth in 2029 Now Being Watched 'Very Carefully'
		The risk rating for asteroid 2004 MN4 was raised Friday by NASA and a separate group of researchers in Italy.
		Asteroid 2004 MN4 is an unusual case in that follow-up observations have caused the risk assessment to climb -- from Torino level 2 to 4 -- rather than fall.
		2004 MN4 was discovered on June 19 by Roy Tucker, David Tholen and Fabrizio Bernardi of the NASA-funded University of Hawaii Asteroid Survey.
	space.com /scienceastronomy/asteroid_risk_041224.html (994 words)

	2004 mn4
		The asteroid's uncertainty region is not large enough to extend to the moon as it passes by, and so a lunar impact is not possible.
		The brightness of 2004 MN4 originally suggested that its diameter is roughly 380 meters and the current, but very uncertain, best estimate of the flyby distance in 2029 is about 390,000 km ( about the distance of the moon).
		It could be that 2004 MN4 is the bright leftover rocket body from Surveyor 3.
	www.geocities.com /douglasrana/2004mn4.htm (1019 words)

	WorldChanging: Another World Is Here: Planetary Life Insurance
		2004 MN4 is an Earth-orbit-crossing asteroid that, for several days in late December, appeared to be on target to hit the Earth in 2029.
		With our current observations about 2004 MN4, astronomers estimate that MN4 has a 1 in 23,000 chance of hitting the Earth in 2035 and a 1 in 14,000 chance of hitting in 2036.
		The reason we would need to launch a transponder soon is that, should we discover 2004 MN4 was going to impact the Earth, it would take steady pushing for months a decade or more in advance to make sure it missed.
	www.worldchanging.com /archives/002793.html (1089 words)

	2004 MN4 Near-Earth Asteroid
		2004 MN4 is a 390 meter asteroid that may intersect Earth oribit on Friday the 13th of April, 2029.
		Asteroid 2004 MN4 Will be visible for the next several months, and astronomers will be closely monitoring and updating the chance of impact.
		On Thursday December 23rd, 2004 the press began reporting that asteroid 2004MN4 has been upgraded to "level 2" on the Torino Impact Hazard Scale.
	2004mn4.info (1035 words)

	Could 2004 MN4 be a rocket body from a space probe launch? (Site not responding. Last check: 2007-10-14)
		On Monday, December 27, 2004 it was announced that enough astronomical observations of 2004 MN4 have been received to rule out a collision in 2029.
		On December 24, 2004, some of the news media sprang the story that an asteroid identified as "2004 MN4" had a 1-in-233 chance of colliding with the Earth on April 13, 2029.
		According to this data (which could be modified by further observations), 2004 MN4 is most likely to miss the Earth by 130,000 miles (half the distance to the Moon) around 22:20 UTC on Friday, April 13, 2029.
	ian.kluft.com /opinions/2004mn4 (1248 words)

	Earth Impact In 2029 Ruled Out For Asteroid MN4
		When these additional observations were used to update the orbit of 2004 MN4, the uncertainties associated with this object's future positions in space were reduced to such an extent that none of the object's possible trajectories can impact the Earth (or Moon) in 2029.
		In the accompanying diagram, the most likely position of asteroid 2004 MN4 is shown at the end of the blue line near the Earth on 13 April 2029.
		The passage of the asteroid by the Earth in 2029 alters its subsequent trajectory and expands the asteroid's position uncertainty region (i.e., the line of white dots increases in extent) so the asteroid's subsequent motion is less certain than it was prior to the 2029 close Earth approach.
	www.spacedaily.com /news/deepimpact-04v.html (591 words)

	2004_mn4 (Site not responding. Last check: 2007-10-14)
		Updated Set of Possible Positions of 2004 MN4 on April 13, 2029 Closeup View The passage of the asteroid by the Earth in 2029 alters its...
		white bar indicates uncertainty in the range of positions (99942) 2004 MN 4 (also written (99942) 2004 MN4) is a Near-Earth asteroid discovered by David J. Tholen that caused a brief period of concern in...
		2004 MN4 circles the Sun, but unlike most asteroids that reside in a belt between Mars and Jupiter, the 323-day orbit of 2004 MN4 lies mostly within the orbit of...
	2004_mn4.networklive.org (749 words)

	2004 MN4 impact risk (Torino scale 2 risk) (Site not responding. Last check: 2007-10-14)
		Bouncing around various mailing lists is news that the asteroid 2004 MN4 has been rated at a Torino scale impact risk of 2, the first object to ever garner that rating.
		Let me be the first of many to suggest that a mission to stick a solar powered radio transponder on 2004 MN4 should now percolate up to the top of the NASA unmanned science mission priorities list, so that we can try and nail down its orbit significantly better.
		Re: 2004 MN4 impact risk (Torino scale 2 risk)
	www.talkaboutscience.com /group/sci.space.policy/messages/312397.html (1270 words)

	News Article: The Saga of Asteroid 2004 MN4 (Site not responding. Last check: 2007-10-14)
		Don Yeomans of JPL summarized the information available on December 22 as follows: 2004 MN4 was discovered on 19 June 2004 by Roy Tucker, David Tholen and Fabrizio Bernardi from Kitt Peak, Arizona, and observed over two nights.
		The diameter of MN4 was estimated to be about half a kilometer (later revised downward slightly to 400 m).
		This case of MN4 was unusual in two ways: for a few days it yielded a value of TS=4, far higher than any encountered previously, and for several days the addition of new data served to increase the calculated odds of impact.
	nai.arc.nasa.gov /impact/news_detail.cfm?ID=154 (961 words)

	Gravity Simulator
		Asteroid 2004 MN4 was discovered on June 19, 2004 by Roy Tucker, David Tholen and Fabrizio Bernardi of the University of Hawaii Asteroid Survey.
		The object was re-discovered on December 18, 2004 by Gordon Garradd of the Siding Spring Survey.
		It was quickly determined that asteroid 2004 MN4 had a very real chance of hitting the Earth on April 13, 2029.
	www.orbitsimulator.com /gravity/articles/a2004mn4.html (334 words)

	Dec. '04 stack 3, Major News about Minor Objects
		2004 MN4 was reported from Reedy Creek Observatory in Australia from yesterday and the day before, 2004 XM29 from Begues and Great Shefford observatories last night in Spain and England, and 2004 XP14 from Farpoint Observatory in Kansas last night.
		It is clear from a question received from a new reader that it needs to be stated that 2004 MN4 remains rated at Torino Scale 4 ("merits concern" for "A close encounter, with 1% or greater chance of a collision capable of causing regional devastation"), something that hasn't changed since December 24th.
		The Minor Planet Center issued its first MPEC for 2004 MN4 on December 20th, MPEC 2004-Y25, linking to the 19-20 June observations and reporting "Additional Observations" from the Siding Spring Survey ( SSS) on the 18th and confirmation from Sabino Canyon Observatory in Arizona and Mt.
	www.hohmanntransfer.com /mn/0412/stak3.htm (5577 words)

	SPACE.com -- Worrisome Asteroid Underscores Planetary Defense Mission
		If indeed the asteroid -- tagged as 2004 MN4 -- does have Earth’s name on it, this errant space rock, given its apparent size, is capable of causing regional devastation.
		While the asteroid is likely to be demoted from its current threat level, the case of 2004 MN4 comes at a time when NASA is weighing the prospect of flying a future asteroid mission that could evaluate planetary defense techniques.
		Asteroid 2004 MN4 is "the most newsworthy NEA event that has happened since the NEA threat was recognized," Chapman observed.
	www.space.com /news/asteroid_defense_041227.html (1456 words)

	Friday the 13th, 2029
		Asteroid 2004 MN4 had been discovered in June 2004, lost, then discovered again six months later.
		Astronomers knew 2004 MN4 would miss Earth when they found pictures of the asteroid taken, unwittingly, in March 2004, three months before its official discovery.
		In January 2004, a team of astronomers led by Lance Benner of JPL pinged 2004 MN4 using the giant Arecibo radar in Puerto Rico.
	science.nasa.gov /headlines/y2005/13may_2004mn4.htm (884 words)

	Universe Today - Asteroid 2004 MN4 Gets the Highest Score on the Torino Scale
		According to current calculations, Asteroid 2004 MN4 will have a 1/300 chance of striking the Earth on April 13, 2029.
		The brightness of 2004 MN4 suggests that its diameter is roughly 400 meters (1300 feet) and our current, but very uncertain, best estimate of the flyby distance in 2029 is about twice the distance of the moon, or about 780,000 km (480,000 miles).
		2004 MN4 was discovered on 19 June 2004 by Roy Tucker, David Tholen and Fabrizio Bernardi of the NASA-funded University of Hawaii Asteroid Survey (UHAS), from Kitt Peak, Arizona, and observed over two nights.
	www.universetoday.com /am/publish/asteroid_2004_mn4.html (676 words)

	Near-Earth Asteroid 2004 MN4 Reaches Highest Score To Date On Hazard Scale \| SpaceRef - Your Space Reference
		December 24 Update: 2004 MN4 is now being tracked very carefully by many astronomers around the world, and we continue to update our risk analysis for this object.
		The cloud of possible positions of asteroid 2004 MN4 relative to Earth on April 13, 2029 is shown in white.
		Animation showing the cloud of possible positions of asteroid 2004 MN4 relative to Earth in April 2029 is shown in white.
	www.spaceref.com /news/viewsr.html?pid=14887 (982 words)

	mark rushing’s things » Blog Archive » Asteriod 2004 MN4 Impact Risk
		Of the appromiately 15,000 known nuclear devices we have today, the 2004 MN4 impact would only be like detonating 2,400 of them simultaneously.
		Asteriod 2004 MN4 was discovered just this year, on June 19th at Kitt Peak observatory in Arizona.
		This entry was posted on Saturday, December 25th, 2004 at 6:52 pm and is filed under Science.
	orbum.net /mark/index.php?p=52 (612 words)

	2004 Mn4 - Information Technology Services (Site not responding. Last check: 2007-10-14)
		To capture the asteroid and 'park' it in orbit would require a decelerating force to bring its velocity down to that which would be compatible with an orbital velocity in Earth's gravity field.
		Even diverting an asteroid that isn't due to hit for 24 years is on the limits of our technology, and to turn a 24 year distant hit into a near miss requires only the tiniest of nudges, compared with the massive shove required to get it into Earth orbit.
		We have elements of system that could be used to deflect NEO 2004 MN4, but we do not have an integrated delivery or missions system.
	www.physicsforums.com /archive/forum/t-57917_2004_Mn4.html (302 words)

	Asteroid 2004 MN4 could hit or miss Earth in 2029
		The Asteroid named 2004 MN4 has been assigned level 4 [A close encounter, with 1% or greater chance of a collision capable of causing regional devastation.], the first Asteroid to get this level rating.
		Roy Tucker, David Tholen and Fabrizio Bernardi of NASA discovered the 2004 MN4 Asteroid in June 19, 2004, from Kitt Peak — Arizona.
		The views expressed in the articles are not necessarily those of earthtimes.org and we accept no responsibility for the views or opinions expressed in the articles either direct or indirect.
	www.earthtimes.org /articles/show/986.html (423 words)

	2004 MN4 - Enpsychlopedia (Site not responding. Last check: 2007-10-14)
		As of February 2005 it is predicted that the asteroid will pass about 36,350 km (22,600 miles) from the Earth's surface on April 13, 2029, slightly higher than the altitude of geosynchronous satellites, which orbit at 35,786 km (22,300 miles).
		The asteroid was precovered to 2004 - March 15.1104, and an improved orbital prediction was released on December 27.
		da:2004 MN4 de:2004 MN4 fr:2004 MN4 ja:2004 MN4 nl:2004 MN4 pl:2004 MN4 zh:2004 MN4
	www.grohol.com /psypsych/2004_MN4 (1726 words)

	The Space Review: Sounding an alarm, cautiously
		If 2004 MN4 passes through a “keyhole” in 2029 just 640 meters across—about twice the diameter of the asteroid itself—the object would enter a trajectory that would result in a collision with the Earth on April 13, 2036.
		One way to better refine the asteroid’s orbit would be to launch a spacecraft to 2004 MN4 in the next few years and place a radio transponder on it, allowing it to be tracked even when it is out of view of Earth-based optical telescopes.
		Also backing the idea of a spacecraft mission to 2004 MN4 is Brian Marsden, director of the Minor Planets Center at the Harvard-Smithsonian Center for Astrophysics, the nexus for coordinating NEO observations and calculating orbits.
	www.thespacereview.com /article/384/1 (2466 words)

	Zeroth Order Approximation: 2004 MN4
		As many people have heard, Earth-crossing asteroid 2004 MN4 (estimated diameter 440 meters) will pass extremely close to Earth on April 13, 2029.
		So we might harbor a secret hope that something like 2004 MN4 will be just what the doctor ordered to summon the political will in our society to invest in a serious spacefaring capability.
		We children of the Apollo age have waited three decades for the next steps in exploration that we once thought were only a few years away.
	zerothorderapprox.blogspot.com /2004/12/2004-mn4.html (665 words)

	News - asteroid 2004 MN4 to miss Earth in 2029
		In the accompanying diagram, the most likely position of 430-metre-long asteroid 2004 MN is shown at the end of the blue line near the Earth on April 13th, 2029.
		When these additional observations were used to update the orbit of 2004 MN, the uncertainties associated with this object's future positions in space were reduced to such an extent that none of the object's possible trajectories can impact the Earth (or Moon) in 2029.
		However, our current risk analysis for 2004 MN indicates that no subsequent Earth encounters in the 21st century are of any concern.
	www.astronomynow.com /news/041227_asteroid_miss.shtml (521 words)

	Analog Discussion Board (Site not responding. Last check: 2007-10-14)
		Asteroid 2004 MN4, about 1300 ft in diameter, orbits the sun in an earth crossing orbit.
		If MN4 is composed of a couple or few large pieces and debris, or is just a rubble pile, the "bag" might hafta be the equivalent of armor plating.
		Apparently, we know less about where MN4 is heading after its close encounter in 2029 than the reassurances that it won't hit the Earth on that particular pass suggest.
	www.analogsf.com /discus/messages/1/975.html?1109263441 (1958 words)

	Astronomy - Will Earth break up 2004 MN4? - Bill Cooke
		But for 2004 MN4, the change in the miss distance was greater than the error computed in the December analyses.
		Put another way, 2004 MN4 is now outside the uncertainty box — the region astronomers thought would contain the object's most likely locations on April 13, 2029.
		Therefore, 2004 MN4 still holds at 1 on the Torino impact hazard scale, a classification designed to quantify the impact risk of near-Earth asteroids (similar to the Ritcher scale for earthquakes).
	www.astronomy.com /asy/default.aspx?c=a&id=2874 (807 words)

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