2005 NB56

2005 NB₅₆
Discovery
Discovered by	Mount Lemmon Survey
Discovery site	Summerhaven, Arizona, US
Discovery date	11 July 2005
Designations
Minor planet category	Apollo ; NEO;
Orbital characteristics
	Epoch 21 November 2025 (JD 2461000.5)
	Uncertainty parameter 0
Observation arc	6,808 d (18.64 yr)
Aphelion	2.41907 AU (361.888 Gm)
Perihelion	0.86615 AU (129.574 Gm)
Semi-major axis	1.64261 AU (245.731 Gm)
Eccentricity	0.47270
Orbital period (sidereal)	2.11 yr (768.95 d)
Mean anomaly	266.58°
Mean motion	0° 28m 5.412s /day
Inclination	6.7671°
Longitude of ascending node	112.109°
Argument of perihelion	114.48°
Earth MOID	0.0154071 AU (2,304,870 km)
Jupiter MOID	2.58553 AU (386.790 Gm)
Physical characteristics
Mean diameter	~170 m
Absolute magnitude (H)	23.33

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 had a poorly known orbit and was only observed over an observation arc of 17 days when it was discovered in 2005, not sufficient to predict its position in 1908 with sufficient accuracy.

References

↑ "2005 NB56". Minor Planet Center. Retrieved 9 August 2017.
1 2 3 4 "(2005 NB56)". JPL Small-Body Database. Jet Propulsion Laboratory. SPK-ID: 3283898. Retrieved 9 August 2017.
↑ 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 [astro-ph.EP].
1 2 When Comets Attack: Solving the Mystery of the Biggest Natural Explosion in Modern History, By Mark Anderson, Popular Mechanics
↑ "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

This near-Earth asteroid-related article is a stub. You can help Wikipedia by adding missing information.

[discovery_ref-1] "2005 NB56". Minor Planet Center. Retrieved 9 August 2017.

[sbdb-2] 1 2 3 4 "(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 [astro-ph.EP].

[PopMech-4] 1 2 When Comets Attack: Solving the Mystery of the Biggest Natural Explosion in Modern History, By Mark Anderson, Popular Mechanics

[neodys-5] "NEODyS: 2005NB56". Department of Mathematics, University of Pisa, ITALY. Retrieved 19 May 2009.