Asteroid Alert

Originally posted by backinblack
reply to post by DJW001

 

Nice thread and added info.

But when did NASA actually notice this rock?
We seem to be getting a few late surprises lately..

This is the exact problem... We dont have the funding or ability right now to find and track all asteroids.
It happens quite often that a asteroid is detected only right before it reaches near earth orbit.
It would be even worse if there was a comet or something coming from direction of the sun, then even if it was large as hell we might not notice it before it is right at our doorstep.

How close does this look !!! lol
This is from the asteroids point of view.

What type of crater could one expect if this did hit earth?

reply to post by RenegadeScholar


See to my post on the last page. It would most likely cause an Air Burst. But who knows.... it may impact the surface or parts of it if it enters the Earths atmosphere and breaks up..

Hell ya ! Right off the bat, it's great to see some one with the proper mojo is on top of this one. That way if you say duck, we can all duck at the same time. I don't why I always have to try be comedien ? I only hope no one else gets as sick of it as I do. Any way Snf . Just don't forget to say when DJ.

reply to post by shauny


Star from me for that!!

awesome just awesome that bloody close one hell of a veiw
thanks for that

karma

reply to post by DJW001


ARRRGGGHHHHHH. It's making a banking turn!!!!!!

Hehe, I had to say it,

Originally posted by LightAssassin
reply to post by DJW001

 

ARRRGGGHHHHHH. It's making a banking turn!!!!!!

Hehe, I had to say it,

The BUGS did it..

Originally posted by shauny
How close does this look !!! lol
This is from the asteroids point of view.

edit on 24/6/2011 by shauny because: (no reason given)

That was killer! Thanks for sharing but it kinda spooked me out haha.

reply to post by FlyersFan


Thats from the asteroid strike of 290 million years ago,Permian Event...hit between S America and the Falklands.....took out 90% of life on Earth at the time....still plays havoc with navigation down there but wont affect anything in space....wish it would plop down though....be some nice waves echoing around for awhile

reply to post by TheUniverse

That could be bad; if it does in-fact collide with Earth since Tunguska(Asteroid) Caused a 5-30 megaton explosion and was 60 metres across.

30 metres may cause a significant Air burst..

I wouldn't be so quick to quote specifics from the Tunguska event. Nobody is even sure what happened there hence why they call it the Tunguska event.

The explosion is believed to have been caused by the air burst of a large meteoroid or comet fragment at an altitude of 5–10 kilometres (3–6 mi) above the Earth's surface. Different studies have yielded varying estimates of the object's size, with general agreement that it was a few tens of metres across.

Tungustka Event
Not sure if it was a comet or meteoroid, how high it was before exploding nor how big it was. No one is sure what this thing was made of nor has anyone actually proven that this was either a meteoroid or comet fragment. There is still a very big mystery concerning this event.

The two things they seem to be sure of are the time of this event and that it was an air burst.

I think that any object coming our way big enough to do any real damage would be seen much sooner than these little rocks. Remember objects fall from the sky onto Earth all the time and most of them hit the ground with little to no damage.

reply to post by Elvis_Is_Dead


20meters... Thats 60 feet in Diamiter.... Something that size won't totally burn up in the atmosphere. It would make an awsome mini-nuke when it hit and a nice hole in the ground..lol

Lucky it is going to miss, though the chances of it hitting a populated area if it were to collide, would be pretty slim..

reply to post by Devino


I already know this but brought the information to the thread because it is widely accepted that is the most probably cause for what happened there.

The other theories are mostly unfounded. What else do you think would have caused the Air Burst?

I'm already aware of the alternate theories but thankyou

Also referring to your last paragraph in your post.....

Well of course little meteorites and asteroids don't do anything to the Earth when they are extremely small they mostly burn up in the atmosphere.

What did you expect?

Remember objects fall from the sky onto Earth all the time and most of them hit the ground with little to no damage.

Well of course thats because they are all small. Rocks/Asteroids/Meteorites/Comets that are larger than 20+30 metres may have fragments survive the journey through the atmosphere and impact with Earth and/or initiate an air-burst event that purportedly happened at Tunguska

reply to post by Ironclad


Refer to my post above its actually estimated to be 9-30 metres

wouldn't be cool if we ended up getting a new moon out of it

I don't know if anyone has posted this, but it appears they've had to recalculate when it's going to blow by us, and so it'll arrive three hours later than originally thought....I suppose there is a normal explanation for why they screwed the pooch during the initial calculation, but I couldn't help but think: Whoa, it's must have slowed down...

here's the link I read the update at

news.yahoo.com...

Originally posted by juleol
This is the exact problem... We dont have the funding or ability right now to find and track all asteroids.

Actually its not the funding...

Military Hush-Up: Incoming Space Rocks Now Classified
Date: 10 June 2009 Time: 05:35 PM ET

For 15 years, scientists have benefited from data gleaned by U.S. classified satellites of natural fireball events in Earth's atmosphere – but no longer. A recent U.S. military policy decision now explicitly states that observations by hush-hush government spacecraft of incoming bolides and fireballs are classified secret and are not to be released, SPACE.com has learned.

www.space.com...

Now why would they want to make incoming space rocks CLASSIFIED?

Originally posted by Ironclad
20meters... Thats 60 feet in Diamiter.... Something that size won't totally burn up in the atmosphere. It would make an awsome mini-nuke when it hit and a nice hole in the ground..lol

Here is some average data, based on a nickel iron meteorite of 20 meters dia entering at 45 degree angle at an average speed. I used distance from impact at 1 kilometer

Your Inputs:
Distance from Impact: 1000.00 meters ( = 3280.00 feet )
Projectile diameter: 20.00 meters ( = 65.60 feet )
Projectile Density: 8000 kg/m3 (nickel/iron)
Impact Velocity: 20.00 km per second ( = 12.40 miles per second )
Impact Angle: 45 degrees
Target Density: 2500 kg/m3
Target Type: Sedimentary Rock

Energy:
Energy before atmospheric entry: 6.70 x 1015 Joules = 1.60 MegaTons TNT
The average interval between impacts of this size somewhere on Earth is 169.6 years

Major Global Changes:
The Earth is not strongly disturbed by the impact and loses negligible mass.
The impact does not make a noticeable change in the tilt of Earth's axis (< 5 hundreths of a degree).
The impact does not shift the Earth's orbit noticeably.

Atmospheric Entry:
The projectile begins to breakup at an altitude of 16600 meters = 54400 ft
The projectile bursts into a cloud of fragments at an altitude of 4780 meters = 15700 ft
The residual velocity of the projectile fragments after the burst is 8.08 km/s = 5.02 miles/s
The energy of the airburst is 5.61 x 1015 Joules = 1.34 x 100 MegaTons.
Large fragments strike the surface and may create a crater strewn field. A more careful treatment of atmospheric entry is required to accurately estimate the size-frequency distribution of meteoroid fragments and predict the number and size of craters formed.

Air Blast:
The air blast will arrive approximately 14.8 seconds after impact.
Peak Overpressure: 40100 Pa = 0.401 bars = 5.69 psi
Max wind velocity: 81.5 m/s = 182 mph
Sound Intensity: 92 dB (May cause ear pain)

Damage Description:
Multistory wall-bearing buildings will experience severe cracking and interior partitions will be blown down
Wood frame buildings will almost completely collapse.
Glass windows will shatter.
Up to 90 percent of trees blown down; remainder stripped of branches and leaves.

impact.ese.ic.ac.uk... wdepth=&wdepthUnits=1&tdens=2500

Not exactly a small rock

reply to post by zorgon

Now why would they want to make incoming space rocks CLASSIFIED?

You have to ask??

But really, at a time when even the President's Dog's real name is probably classified,what would you expect..

Remember, the President received his recent "Transparency Award" behind closed doors !!