Meteor that streaked over Missouri weighed about 220 pounds

ST. LOUIS -- NASA says a meteor seen streaking through the sky behind the Gateway Arch in St. Louis was a basketball-size hunk of rock that broke off from an asteroid belt between Mars and Jupiter.

The St. Louis Post-Dispatch reported experts used hundreds of eyewitness accounts from as far away as South Dakota and Minnesota along with two videos to calculate information about the meteor.

They determined the approximately 220-pound rock traveled through the sky Monday night at 33,500 mph, causing a sonic boom. A NASA weather satellite helped the agency confirm it was brighter than Venus in the sky, making it a fireball.

Bill Cooke, of the NASA Meteoroid Environments Office in Huntsville, Alabama, said it broke into pieces 12 miles above the ground.

Information from: St. Louis Post-Dispatch, http://www.stltoday.com