1972 Great Daylight Fireball

The fireball of August 10, 1972, a meteoroid, which occurred on 10th August 1972 at 14:30 clock local time ( 20:29 UTC) the U.S. state of Utah with a speed of about 15 km / s in the Earth's atmosphere and these crossed at a maximum approach of 53 kilometers. The meteoroid was there, visible in full daylight, as bolide (or fireball ). The object was moving in a northerly direction of flight and left the atmosphere after about 100 seconds on the Canadian province of Alberta. The fireball was observed by many people, shot on film and recorded by sensors in space. It was this is the first ever observed and scientifically researched cars. The meteoroid was designated US19720810. In the Anglo -Saxon world, this event became known as the Great Daylight Fireball of 1972 (large daylight bolide of 1972).

Scientific studies have shown that the meteoroid (in the case of a carbonaceous chondrites ) and 14 meters ( in the case of cometary ice) was great before the entrance between 3 meters. An analysis of 1994 came to the conclusion that the passage reduced the mass of the meteoroid to one-third by the Earth's atmosphere. Its speed thereby decreased by about 800 meters per second and the orbital inclination changed markedly from 15 to 8 degrees.

By 2008, only three other such incidents have been observed: The fireball on October 13, 1990 at 100 km above the Czech Republic and the possible fireball over Japan on 29 March 2006 and EN070807.

Swell

• . Abe, Shinsuke et al: "Earth- grazing fireball on March 29, 2006," European Planetary Science Congress 2006, p 486; 'the first and second Earth - grazing fireballs Observed on August 10, 1972 ( Jacchia, 1974; Ceplecha, 1979) and on October 13, 1990 ( Borovicka and Ceplecha, 1992) '
• Abe, Shinsuke et al.: "Earth- grazing fireball on March 29, 2006 " (PDF)