1972 Great Daylight Fireball

[3] An eyewitness to the event, located in Missoula, Montana, saw the object pass directly overhead and heard a double sonic boom.

A 1994 study found that it is probably still in an Earth-crossing orbit and predicted that it would pass close to Earth again in August 1997.

[5] Analysis of its appearance and trajectory showed the object was about 3 to 14 meters (10 to 46 feet) in diameter, depending on whether it was a comet made of ice or a stony and therefore denser asteroid.

[2][6] Other sources identified it as an Apollo asteroid in an Earth-crossing orbit that would make a subsequent close approach to Earth in August 1997.

[6] The object was tracked by military surveillance systems and sufficient data obtained to determine its orbit both before and after its 100-second passage through Earth's atmosphere.