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Close Approach By Asteroid 2012 BX34
An anonymous reader writes with news that asteroid 2012 BX34, 11 meters wide, is in the process of passing within 60,000km of Earth — about a fifth of the distance between the Earth and the Moon. At that size, the asteroid would pose no danger even if it hit the Earth's atmosphere.
Either the summary changed or Brucelet neglected to read the summary where it says the asteroid is 11 meters wide.
nope, stony asteroid has to be about 35 meters or more in diameter to "make a dent", otherwise it will just burn up in atmosphere.
also of interest, a 10 meter metal (e.g. iron-nickel) asteroid will have big fragments that will hit the ground, for example the one that hit Sikhote-Alin mountains in Siberia in February 1947, 150 tons of fragments hit the ground and one of them weighed 1.7 tons!
The asteroid was discovered two days ago on the 25th, and its closest approach occurs today. Not much time there to get the shuttle back from the Smithsonian, haul it down to Florida, refit it with all the stuff they took out, and launch Bruce Willis to destroy the asteroid. Good thing it's not a larger asteroid on an actual collision course. (Yeah, I know, the shuttle isn't actually at the Smithsonian yet)
Better known as 318230.
"A stony meteoroid of about 10 metres (30 ft) in diameter can produce an explosion of around 20 kilotons". (air-burst) I guess it depends on the angle of attack and altitude at burst. (from Wiki) http://en.wikipedia.org/wiki/Tunguska_event
The issue is we can only tell when one is about a day out. Many times we can only see them as they are leaving, not aproaching. It is actually a fairly common occorance. You can see them at http://www.spaceweather.com/. Since the begniing of the year there have been 5 that have come close enough to actually be of note.
You might not find it interesting, but I do.
Just because it isn't software or hardware doesn't mean it isn't fitting for a nerd-news site. It's appropriately listed under Science and is a very interesting event. A small (seriously, 11 metres) object coming very close to Earth poses an interesting test of our local space awareness. If we can detect these things sooner and more accurately this is exactly the sort of thing that would be a candidate for capture once we have a proper space presence.
We are shifting, astrologically, from the Age of Pisces to the Age of Aquarius.
Hooray for water recycling!
Ezekiel 23:20
Generally, if they cite only one dimension, they're citing the *largest* dimension. So you know it's at most 11 x 11 x 11.
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I would rather have a baseball traveling the speed of light hit us rather then a 1000 ton pieces of stone impacting the earth at 55,000 km per hour.
Are you sure?
The "big rock hitting us pretty fast" case is a kinetic energy content of 1.167 x 10^14 Joules, or about 28 kilotons equivalent yield.
OTOH, that wee little 145 gram baseball at .999c is 6.5 x 10^15 Joules, or 1.55 megatons yield equivalent*.
Both of those are city-killers, I suppose, but the baseball will kill a bigger city deader.
Neither is a dinosaur-killer. Humanity has made, and used, weapons with as much energy release as that.
*Actually, that "baseball at the speed of light" is classical kinetic energy. Using the relativistic kinetic energy equation, which seems appropriate at .999c, the answer turns out to be 2.78 x 10^17 Joules,, or about 66 1/2 megatons. Which is a bit more than the biggest weapon we've ever used in any setting. Still not a dinosaur-killer, but damned unpleasant to be anywhere near I'd bet.
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