Asteroid fly past the earth

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Asteroid fly past the earth

Postby Wizav on Sun Sep 12, 2010 9:18 pm

http://uk.news.yahoo.com/4/20100908/twl ... f21e0.html

Nasa have urged amateur astronomers to watch the skies as the Earth has a near encounter with two asteroids. The objects, discovered just days ago, will pass within the moon's distance. Both can be viewed through medium-sized amateur telescopes.

The Catalina Sky Survey in Arizona, discovered both objects on Sunday morning during a routine monitoring of the skies.Astronomers in Massachusetts determined their orbits and concluded that both objects would pass within the distance of the moon about three days after their discovery.

Near-Earth asteroid 2010 RX30 is estimated to be 32 to 65 feet (10 to 20 meters) in size and will pass within 0.6 lunar distances of Earth (about 154,000 miles, or 248,000 kilometers) 10am GMT. The second object, 2010 RF12, estimated to be 20 to 46 feet (6 to 14 meters) in size, will pass within 0.2 lunar distances (about 49,088 miles or 79,000 kilometers) a few hours later at 6 pm GMT.


"Just days ago" seems a bit too short notice to be detecting things heading for earth methins :S Does anyone know how large an asteroid has to be to survive entry into the atmosphere, 20-46 feet sounds big enough to me, That's a chunk of rock size of a lorry hitting earth at 20,000+ mph going to make a nice dent


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Re: Asteroid fly past the earth

Postby EWJ on Sun Sep 12, 2010 10:10 pm

aye but those size of asteroids burn up.
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Re: Asteroid fly past the earth

Postby Wizav on Sun Sep 12, 2010 10:58 pm

Are you sure?


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Re: Asteroid fly past the earth

Postby Xhiea on Sun Sep 12, 2010 11:06 pm

apparently these things fly past all the time, the ones which actually are 'on target' burn up in the atmosphere, thats why NASA aren't really bothered about them.

It was on gizmodo a few days ago

http://gizmodo.com/5632193/nasa-asterio ... confidence
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Re: Asteroid fly past the earth

Postby EWJ on Sun Sep 12, 2010 11:55 pm

Wizav wrote: Does anyone know how large an asteroid has to be to survive entry into the atmosphere, 20-46 feet sounds big enough to me, That's a chunk of rock size of a lorry hitting earth at 20,000+ mph going to make a nice dent



according to our pals in NASA... it'd be
the atmosphere protects us against most objects smaller than a football field across


or about 360 by 160 feet.(assuming they mean a US football field) :)

So pretty damn big.. :cheers:
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Re: Asteroid fly past the earth

Postby Wizav on Mon Sep 13, 2010 12:24 am

How do these get through then?

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And Mojave desert is littered with them ranging in size from tennis ball to basketball. I guess they start off alot bigger and burn off most of there mass in the atmosphere?


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Re: Asteroid fly past the earth

Postby quaduski on Mon Sep 13, 2010 6:36 am

you answered your own question, thats all thats left after the atomsphere burnt away the outer layers of material. It would still give you a headache!
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Re: Asteroid fly past the earth

Postby EWJ on Mon Sep 13, 2010 7:37 am

The Discovery channel ran some ads a few years back with people all walking around with bullseye's on their heads.. twas funny to see people looking to the sky everytime they heard a noise..
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Re: Asteroid fly past the earth

Postby syco cocker on Mon Sep 13, 2010 1:04 pm

I always think if a big one hits they won't see it coming anyway.
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Re: Asteroid fly past the earth

Postby epicfail on Mon Sep 13, 2010 1:40 pm

There are some pretty big craters aren't there? Where really big ones hit, the one I'm thinking of was mentioned in that movie wolf creek.


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Re: Asteroid fly past the earth

Postby Flare on Mon Sep 13, 2010 1:52 pm

LOL, when I first read the OP (or should that be misread :oops: ) I thought it said a near earth sized asteroid was going to pass earth at a distance from moon to the earth, was like ' WHAAAATTT.... ' .

I read on , and saw it was luckily slightly smaller than I initially read. :cheers:
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Re: Asteroid fly past the earth

Postby Nightwalker on Mon Sep 13, 2010 3:24 pm

Those smaller rocks (see pic) hitting the earth were originally hundrerd times bigger before entering the atmosphere. I have spoken!
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Re: Asteroid fly past the earth

Postby Nightwalker on Mon Sep 13, 2010 3:24 pm

Those smaller rocks (see pic) hitting the earth were originally at least a hundred times bigger before entering the atmosphere. I have spoken!
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Re: Asteroid fly past the earth

Postby EWJ on Mon Sep 13, 2010 5:06 pm

spoken twice cos of being a true hero! :D
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Re: Asteroid fly past the earth

Postby Nightwalker on Mon Sep 13, 2010 6:01 pm

lol weird that this dubbelposted...
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Re: Asteroid fly past the earth

Postby Arbor plena simia on Mon Sep 13, 2010 6:24 pm

epicfail wrote:There are some pretty big craters aren't there?
The Chixulub crater at Yucutan is over 180km across. This was caused by an asteroid that struck around the dinosaur extinction (note, not necessarily what caused it) which was about 10km across - the width originaly ascertained from iridum densities at the K/T boundary. The energy released would have been the equivelant of about 50Gt of TNT or 3 million Hiroshima bombs.

That's pretty damn big. We don't see many craters compared to say the moon though because of the atmosphere burning up asteroids for a start, but also erosion (from having an atmosphere) and tectonic subduction removing older ones.
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Re: Asteroid fly past the earth

Postby epicfail on Mon Sep 13, 2010 6:41 pm

Fingers crossed nothing like that happens soon then. Note to self: always wear a helmet outdoors.


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Re: Asteroid fly past the earth

Postby UK_sniper on Mon Sep 13, 2010 6:50 pm

to be honest, if an asteroid the size of the one that killed off the dinosaurs struck again it would be pretty much game over for humans no matter what we do.

so if you hear of an asteroid going to hit earth your probably better off near the impact zone. at least it'd be quick :|
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Re: Asteroid fly past the earth

Postby Wizav on Mon Sep 13, 2010 7:42 pm

According to this http://en.wikipedia.org/wiki/Tunguska_event small asteroids can still be deadly.

Here's a list of current biggest craters on earth http://en.wikipedia.org/wiki/List_of_im ... s_on_Earth

Some of them are only 200,000 years apart and the most recent was 5 million years ago.

Biggest currently known http://en.wikipedia.org/wiki/Vredefort_crater


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Re: Asteroid fly past the earth

Postby Demiguise on Mon Sep 13, 2010 8:42 pm

It's quite hard to spot a small object travelling towards the Earth with the infinite space behind it. It's not like we have super cool sensors :/
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