Danger Asteroids

[TheBigDog]

http://www.physorg.com/news11340.html

___The article brings up Apophis in relation to a different asteroid, 2004 VD17

The approach distance for this rock is not given, according to the article, but it is danger color code grade yellow, "meriting attention." :steering:

 

From the article above...

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.

That is my 134th birthday! I can have a birthday/apocalypse party!

 

Bill

[sergey500]

This has nothing to do with rocks from space, but it does have to do with getting objects out of space back down to Earth. Sorry if this a little too out of place, I just always wondered....

 

The ISS will be completed later on this year, I just wanted to know, when it is all done and used up in like the next 5 years or so where it becomes useless. How are they going to get it down? Or will they leave it floating? Or take it piece by piece? Just wondering.

 

Anyways, about objects hitting, Earth don't worry. They travel at 120,000 mph if it and it really is that big you will be dead within 10 min. I guess it depends where you live, but no point of worrying if death comes that fast. Besdies isn't NASA building a whole array of defense protocols against these things? That STILL haven';t been tested although the idea was given in the 1980's, oh well.

[Qfwfq]

ie worst cast senario, moon gets put into a declining orbit and earth now has X years to live

To cause that it would have to reduce the moon's orbital angular momentum to a tiny fraction of the current value, a 300 metre rock at ardinary velocity wouldn't do that. It wouldn't be after years anyway, it would be within one lunar orbit. Once the moon was in a new elipse, that would be its new orbit until something else changed it.

 

A 300 m rock would only be a killer according to where it strikes, early warning would be the best remedy except for non-transportable property.

[InfiniteNow]

A 300 m rock would only be a killer according to where it strikes, early warning would be the best remedy except for non-transportable property.

Correct me if I'm wrong... wouldn't a land based impact be better than an oceanic impact?

[sergey500]

...What are you talking about infiiitenow? A land impact would send out trememdous shockwaves, then Earthquakes bouncing back and forth around the Earth, and don't forget the dust that will rise up blocking out sun and causing us another ice age that we already heading into. Meanwhile a water impact would create tsunamis amd wipe out some low lieing costs and destroy some shore cities. I don't know about you, but I will take a few destroyed cities over the whole planet freezing up faster anyday.

[InfiniteNow]

Hmmm.... Okay, quick-draw... thanks for motivating me to find the answer myself:

 

 

http://neo.jpl.nasa.gov/neo/report.html

Collision hazard - The damage and casualties resulting from a collision with members of the hazardous population were estimated, including direct damage from land impact, as well as the amplification of damage caused by tsunami and global effects. The capture cross-section of the Earth was then used to estimate a collision rate and thus a yearly average hazard from NEO collisions as a function of their diameter. We find that damage from smaller land impacts below the threshold for global climatic effects is peaked at sizes on the scale of the Tunguska air blast event of 1908 (50-100 m diameter). For the local damage due to ocean impacts (and the associated tsunami), the damage reaches a maximum for impacts from objects at about 200 m in diameter; smaller ones do not reach the surface at cosmic speed and energy.

 

 

http://impact.arc.nasa.gov/gov_threat_2002.cfm

After NEAs that are large enough to risk a global catastrophe, we naturally turn our attention to smaller impacts that never-the-less would be capable of destruction on a vast scale, killing tens of millions of people. These are impacts by NEAs less than 1 km in diameter, but still large enough to devastate a large region. Such sub-kilometer NEAs are most dangerous, in fact, if they strike in the oceans. The resulting tidal wave or tsunami is an effective way to carry the energy of the collision to large distances from the point of impact. The tsunami from the ocean impact of a NEA 500 m in diameter could inundate many coastal cities in a single event. While not posing as great a risk as the global scale impact from NEAs more than 1 km in diameter, the danger from such ocean impacts may eventually be judged great enough to warrant action.

 

 

You might want to slow down some before posting with such a tone... :confused:

[InfiniteNow]

What I'm not sure about is if this changes at all with rocks bigger than 1 km in diameter.

[sergey500]

You're chances of that is 1:100,000,000,000 or 1 every 16 million years or something along those lines.

 

GAHDedit:

@Turtle: talk in PM about rep

[Qfwfq]

In any case Sergey you might wish to do as Infinite says, and tone down once and a while, instead of making a big deal of rep. Saying "what are you talking about" as a rebutt might not always be taken as humourous and this isn't the first time you've come across with altered tones. It might even induce someone to comment on your sig, finding it in line with your attitude. Apparently, Turtle does have a sense of humour.

 

Watchin' over you,

Qfwfq

[Turtle]

___The discovery of a new impact crater some 19 miles in diameter is described in the following link. Found by satellite image analysis, the impact crater is in the Sahara desert & hardly distinguishable as a crater from the ground.

___An impact this large is likely to have global consequences & its study may better prepare us for future impacts.:naughty:

http://www.bu.edu/phpbin/news/releases/display.php?id=1073

[Mercedes Benzene]

Apparently Apophis is now being considered a big enough threat to have scientists urge the UN to take action. I can't find a good postable article yet, but just google "asteroid". It's making news.

1 in 45,000 chance of a collision.

Here's the CNN article.

Asteroid Deflector