Looks like we're in for another close pass by a big chunk of space debris:
Talk about a close shave. On Feb. 15th an asteroid about half the size of a football field will fly past Earth only 17,200 miles above our planet's surface. There's no danger of a collision, but the space rock, designated 2012 DA14, has NASA's attention.
"This is a record-setting close approach," says Don Yeomans of NASA's Near Earth Object Program at JPL. "Since regular sky surveys began in the 1990s, we've never seen an object this big get so close to Earth."
Record Setting Asteroid Flyby
The new, digital NASA even has an online video to talk about it, which is where this diagram of 2012-DA14's close approach to earth came from:
Image credit: Screenshot of this NASA video by Cujo359
So, yes, once again we will not get to see earth-shattering explosions happen, unless, of course, we like what passes for science fiction cinema these days. As the graphic shows, the asteroid will pass closer than geosynchronous satellites, but well above the International Space Station (ISS) or the Hubble Space Telescope, so there's not much danger there, either. (Well, maybe not "shows" as "implies. See UPDATE/NOTE1.)
What would have happened had this asteroid hit the Earth? It would have been extremely unpleasant for some of us:
The impact of a 50-meter asteroid is not cataclysmic--unless you happen to be underneath it. Yeomans points out that a similar-sized object formed the mile wide Meteor Crater in Arizona when it struck about 50,000 years ago. "That asteroid was made of iron," he says, "which made it an especially potent impactor." Also, in 1908, something about the size of 2012 DA14 exploded in the atmosphere above Siberia, leveling hundreds of square miles of forest. Researchers are still studying the "Tunguska Event" for clues to the impacting object.
"2012 DA14 will definitely not hit Earth," emphasizes Yeomans. "The orbit of the asteroid is known well enough to rule out an impact."
Record Setting Asteroid Flyby
As this photo I took of the meteor that hit Meteor Crater, shows, that was, indeed, made of metal, which made it a more formidable projectile. 2012 DA14 is made of stone, so probably would break up more before reaching the surface.
The main reason I mention this is that, for some reason, the Space.com article on this subject is "embargoed", to use their terminology from the front page. I'm not sure why that is, but it doesn't appear to be the work of some doomsday cult.
UPDATE/NOTE 1: Well, actually, the graphic doesn't show low earth orbit, largely because it's so near the Earth on that scale that you probably couldn't see it. The ISS is roughly 200 miles (let's say roughly 300 kilometers) above the Earth's surface. That's well below where the asteroid will be passing us.