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2005 NB₅₆, also written as 2005 NB56, is a near-Earth asteroid of the Apollo group. In 2009, research physicist Edward Drobyshevski and colleagues have suggested that 2005 NB₅₆ could be a possible source of the meteoroid that caused the Tunguska event on 30 June 1908. It has been also suspected to be a dormant comet.

Possible source of the Tunguska event bolide

One study "suggests that a chunk of a comet caused the 5-10 megaton fireball, bouncing off the atmosphere and back into orbit around the sun."

This object made a close approach to Earth when it was discovered in 2005 and will do so again in 2045. This object has a poorly known orbit and was only observed over an observation arc of 17 days, not sufficient to predict its position in 1908 with sufficient accuracy.

References

1. ^ "2005 NB56". Minor Planet Center. Retrieved 9 August 2017.
2. ^ "(2005 NB56)". JPL Small-Body Database. Jet Propulsion Laboratory. SPK-ID: 3283898. Retrieved 9 August 2017.
3. Drobyshevski, E. M.; Galushina, T. Yu; Drobyshevski, M. E. (March 2009). "A search for a present-day candidate for the Comet P/Tunguska-1908". arXiv:0903.3313 .
4. ^ When Comets Attack: Solving the Mystery of the Biggest Natural Explosion in Modern History, By Mark Anderson, Popular Mechanics
5. "NEODyS: 2005NB56". Department of Mathematics, University of Pisa, ITALY. Retrieved 19 May 2009.

External links

• 2005 NB56 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

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