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Bolide

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Bolide

A bolide (French via Latin from the Greek βολίς bolís, "missile") is an extremely bright meteor, especially one that explodes in the atmosphere. In astronomy, it refers to a fireball about as bright as the full moon, and it is generally considered a synonym of a fireball. In geology, a bolide is a very large impactor.

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One definition describes a bolide as a fireball reaching an apparent magnitude of −14 or brighter – more than twice as bright as the full moon. Another definition describes a bolide as any generic large crater-forming impacting body whose composition (for example, whether it is a rocky or metallic asteroid, or an icy comet) is unknown.

A superbolide is a bolide which reaches an apparent magnitude of −17 or brighter. Recent examples of superbolides include the Sutter's Mill meteorite and the Chelyabinsk meteor.

Astronomy

The IAU has no official definition of "bolide", and generally considers the term synonymous with fireball, a brighter-than-usual meteor. However, the term generally applies to fireballs reaching an apparent magnitude −14 or brighter. Astronomers tend to use bolide to identify an exceptionally bright fireball, particularly one that explodes (sometimes called a detonating fireball). It may also be used to mean a fireball that is audible.

Superbolide

Selected superbolide air-bursts events:

  • Tunguska event (Russia, 1908)
  • 2009 Sulawesi superbolide (Indonesia, 2009)
  • Chelyabinsk meteor (Russia, 2013)
  • Geology

    Geologists use the term bolide in a somewhat different context than astronomers do. In geology, it indicates a very large impactor. For example, the Woods Hole Coastal and Marine Science Center of the USGS uses bolide as a generic term that describes any large crater-forming impacting body whose origin and composition is unknown, as, for example, whether it was a stony or metallic asteroid, or a less dense, icy comet made of volatiles, such as water, ammonia and methane.

    References

    Bolide Wikipedia


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