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And thanks LibWhacker.

NASA confirms the 60-meter (197-feet) asteroid, spotted by Spanish stargazers in February, has a good chance of colliding with Earth... February 15, 2013, when the distance between the planet and space wanderer will be under 27,000 km (16,700 miles)... if the entire asteroid is to crash into the planet, the impact will be as hard as in the Tunguska blast, which in 1908 knocked down trees over a total area of 2,150 sq km (830 sq miles) in Siberia. This is almost the size of Luxembourg.

Gee, it'll just knock down some trees. Whew. Of course, the Tunguska object is generally believed to have been mostly water, and detonated above the ground. This is *just* a 60 meter (197 foot) rock...

Meteor Crater [snip] The Meteor Crater in the state of Arizona was the first crater to be identified as an impact crater. Between 20,000 to 50,000 years ago, a small asteroid about 80 feet in diameter impacted the Earth and formed the crater. The crater is the best preserved crater on Earth and measures 1.2 km [3/4 mile] in diameter. [/snip]

...IOW, this asteroid is approximately EIGHT times (at least twice in each of three dimensions) more massive than the Barringer object that made Meteor/Barringer Crater — enough to make a crater eight times the size. If it hit in, say, Chicago, the crater would be roughly two miles across (sq root of 8, 2.828427125 times .75 miles), and the shock wave would knock down everything else for many miles in all directions.

Of course, we’d better not take my word for it...