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Asteroid With Chance of Hitting Earth in 2029 Now Being Watched 'Very Carefully' (1 in 43 odds)
http://www.space.com ^ | Update, Dec. 25, 9:47 p.m. ET | Robert Roy Britt

Posted on 12/26/2004 8:33:58 PM PST by shadowman99


Original story below

Update, Dec. 25, 9:47 p.m. ET: The risk of an impact by asteroid 2004 MN4 went up slightly on Saturday, Dec. 25. It is now pegged at having a 1-in -45 chance of striking the planet on April 13, 2029. That's up from 1-in-63 late on Dec. 24, and 1-in-300 early on Dec. 24.

Astronomers still stress that it is very likely the risk will be reduced to zero with further observations. And even as it stands with present knowledge, the chances are 97.8 percent the rock will miss Earth.


Update, Dec. 24, 10:19 p.m. ET: An asteroid that has a small chance of hitting Earth in the year 2029 was upgraded to an unprecedented level of risk Friday, Dec. 24. Scientists still stress, however, that further observations will likely show the space rock won't be on a collision course with the planet.

The risk rating for asteroid 2004 MN4 was raised Friday by NASA and a separate group of researchers in Italy.

The asteroid's risk rating a possible impact scenario on April 13, 2029 has now been categorized as a 4 on the Torino Scale. The level 4 rating -- never before issued -- is reserved for "events meriting concern."

The Dec. 24 update from NASA stated:

"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. Today's impact monitoring results indicate that the impact probability for April 13, 2029 has risen to about 1.6 percent, which for an object of this size corresponds to a rating of 4 on the ten-point Torino Scale. Nevertheless, the odds against impact are still high, about 60-to-1, meaning that there is a better than 98 percent chance that new data in the coming days, weeks, and months will rule out any possibility of impact in 2029."

With a half-dozen or so other asteroid discoveries dating back to 1997, scientists had announced long odds of an impact -- generating frightening headlines in some cases -- only to announce within hours or days that the impact chances had been reduced to zero by further observations. Experts have said repeatedly that they are concerned about alarming the public before enough data is gathered to project an asteroid's path accurately.

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.


An edited version of the 2004 MN4 story originally posted on SPACE.com at 9:58 a.m. ET on Dec. 24:

Scientists said Thursday that a recently discovered asteroid has a chance of hitting Earth in the year 2029, but that further observations would likely rule out the impact scenario.

The asteroid is named 2004 MN4. It was discovered in June and spotted again this month. It is about a quarter mile (400 meters) wide.

That's bigger than the space rock that carved meteor crater in Arizona, and bigger than one that exploded in the air above Siberia in 1908, flattening thousands of square miles of forest. If an asteroid the size of 2004 MN4 hit the Earth, it would do considerable localized or regional damage. It would not cause damage on a global scale.

Scientists stressed, however, that the rock would likely miss the planet.

A statement was released by NASA asteroid experts Don Yeomans, Steve Chesley and Paul Chodas.

"The odds of impact, presently around 1-in-300, are unusual enough to merit special monitoring by astronomers, but should not be of public concern," the scientists said. "These odds are likely to change on a day-to-day basis as new data are received. In all likelihood, the possibility of impact will eventually be eliminated as the asteroid continues to be tracked by astronomers around the world."

The scientists project an asteroid's future travels based on observations of its current orbit around the Sun. On computer models, the future orbits are not lines but rather windows of possibility. The orbit projections for 2004 MN4 on April 13, 2029 cover a wide swath of space that includes the location where Earth will be. Additional observations will allow refined orbit forecasts -- more like a line instead of a window.

The asteroid will be easily observable in coming months, so scientists expect to figure out its path.

Most asteroids circle the Sun in a belt between Mars and Jupiter. But some get gravitationally booted toward the inner solar system.

The 323-day orbit of 2004 MN4 lies mostly within the orbit of Earth. The asteroid approaches the Sun almost as close as the orbit of Venus. It crosses near the Earth's orbit twice on each of its passages about the Sun.

2004 MN4 was discovered on June 19 by Roy Tucker, David Tholen and Fabrizio Bernardi of the NASA-funded University of Hawaii Asteroid Survey. It was rediscovered on Dec. 18 from Australia by Gordon Garradd of the Siding Spring Survey. More than three dozen observations have been made, with more expected to roll in from other observatories this week.

It has been a busy stretch for asteroid scientists. Earlier this week, researchers announced that a small space rock had zoomed past Earth closer than the orbits of some satellites.


TOPICS: Extended News; News/Current Events; Technical
KEYWORDS: 2029; artbell; asteroid; theskyisfalling
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Happy New Year.
1 posted on 12/26/2004 8:33:58 PM PST by shadowman99
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To: shadowman99

I'm holding off on joining Netflix. If the world ends and there are days left in the month, I ain't losin out!


2 posted on 12/26/2004 8:38:20 PM PST by Darkwolf377 (Meeting lunacy with lunacy since 1965.)
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To: shadowman99
Anybody ever read a great novel from the 1970's called Luicifer's Hammer by Jerry Pournelle and Larry Niven? Awesome book on point (nearly--concerns a comet) with this thread!
3 posted on 12/26/2004 8:40:57 PM PST by ExSoldier (Democracy is 2 wolves and a lamb voting on dinner. Liberty is a well armed lamb contesting the vote.)
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To: shadowman99

So what? Let's party like it's 1999.


4 posted on 12/26/2004 8:42:19 PM PST by HighWheeler ("The penalty good men pay for indifference to public affairs is to be ruled by evil men." Plato)
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To: ExSoldier

I've read it, several times, in fact.

Excellent read, but a little unlikely.


5 posted on 12/26/2004 8:44:34 PM PST by clee1 (Islam is a deadly plague; liberalism is the AIDS virus that prevents us from defending ourselves.)
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To: ExSoldier

Yup. Terrific book. I consider the scene with the surfer trying to ride out the tsunami one of the most memorable scenes in any book I ever read, and I'm not even a big surfing fan.

Qwinn


6 posted on 12/26/2004 8:45:13 PM PST by Qwinn
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To: shadowman99

Bruce Willis... Please go to a white courtesy phone for a message.


7 posted on 12/26/2004 8:45:43 PM PST by nhoward14 (Freedom costs a buck-o-five.)
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To: shadowman99

Wait a sec -- the first time this story was posted, the odds were 1/300. Why the change??


8 posted on 12/26/2004 8:45:56 PM PST by berkeleybeej (Live Free or Diebold)
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To: berkeleybeej

1/300 wasn't scary enough...


9 posted on 12/26/2004 8:47:06 PM PST by null and void (I refuse to live my life as if someone, somewhere will be offended if I laugh...)
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Comment #10 Removed by Moderator

To: shadowman99
It has been a busy stretch for asteroid scientists. Earlier this week, researchers announced that a small space rock had zoomed past Earth closer than the orbits of some satellites.

It's shooting gallery out there folks, and Planet Earth is a sitting duck!

11 posted on 12/26/2004 8:50:37 PM PST by F16Fighter
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To: Darkwolf377

lets see, if I take out my y2k kit, add some duck tape and change the water, I should be ok.


12 posted on 12/26/2004 8:51:29 PM PST by Lokibob (All typos and spelling errors are mine and copyrighted!!!!)
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To: Darkwolf377

I will be 80dy..Dont care.....


13 posted on 12/26/2004 8:51:47 PM PST by CGASMIA68
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To: shadowman99
...categorized as a 4 on the Torino Scale...

I'd say this one is a 10.

14 posted on 12/26/2004 8:52:28 PM PST by FReepaholic (Proud FReeper since 1998. Proud monthly donor.)
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To: berkeleybeej
Wait a sec -- the first time this story was posted, the odds were 1/300. Why the change??

More data from more observations changed the result of the calculation of the chance it hits.

15 posted on 12/26/2004 8:54:43 PM PST by Strategerist
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To: ExSoldier

It reminded me of Footfall by the same authors. Great book. The pfftth (I'm sure I spelled it wrong) threw an asteroid at us and wiped out India.


16 posted on 12/26/2004 8:55:32 PM PST by gitmo (Thanks, Mel. I needed that.)
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To: shadowman99

The way the odds are going, I'd lay a bet on that one.


17 posted on 12/26/2004 8:56:26 PM PST by Duchess47 ("One day I will leave this world and dream myself to Reality" Crazy Horse)
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To: shadowman99
It is now pegged at having a 1-in -45 chance of striking the planet on April 13, 2029.

Yep, that's the risk on that one day only. Cumulatively, over the 70 years subsequent to 2029, the risk is about 30% (as of right now). Wish they wouldn't announce these things until they get it nailed down. What's the point?

18 posted on 12/26/2004 8:57:19 PM PST by LibWhacker
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To: shadowman99

I will be 17 days shy of 62 years old on that day. My son will be 29 years, and my daughter will be 34.


19 posted on 12/26/2004 8:57:42 PM PST by trussell (I Never Frown, even when I am sad,because I never know who is falling in love with my Smile!!!)
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To: shadowman99
Time to develop the giant space based laser "defensive" weapon.
20 posted on 12/26/2004 8:57:43 PM PST by bayourod (Our troops are already securing our borders against terrorists. They're killing them in Iraq.)
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