I know, I know. That’s a scary headline, but we’re all safe. A very small asteroid estimated at between 3 and 13 feet across (1-4 meters) named 2014 AA headed straight for Earth around 9 p.m. CST on Jan. 1. It likely broke apart in the atmosphere with pieces scattering somewhere along a path stretching from Central America across the Atlantic Ocean to West Africa.
The reason for the uncertainty is that only a few measurements of of 2014 AA’s position were possible before it literally disappeared from view. Richard Kowalski of the Catalina Sky Survey out of Tucson, Ariz. picked up the object on New Year’s Eve in northern Orion as a tiny twinkle of 19th magnitude. At the time, the asteroid was only 300,000 miles from Earth. When it hit the atmosphere some 22 hours later, it must have created a spectacular fireball.
2014 AA was similar in size to 2008 TC3, the only other asteroid discovered and tracked before impact. That one, estimated at 13 feet across, fragmented in Earth’s atmosphere over the Nubian Desert in Sudan on October 7, 2008.
Later, dozens of fragments with a total weight of 8.7 pounds (3.95 kg) were recovered as the Almahata Sitta meteorite.
Right now, signals from the global network of infrasound stations are being analyzed to see if they can be correlated with an impact. There are no visual sightings of the asteroid … Perhaps a surveillance satellite snagged it or we’ll hear of a airplane pilot seeing something. Stay tuned!
UPDATE Jan. 3: Three weak infrasound signals have been detected pointing to an impact near 12 degrees north, 40 degrees west latitude about 1,900 miles (3,000 km) east of Caracas, Venezuela in the Atlantic Ocean.