| Discovery[1] | |
|---|---|
| Discovered by | Mount Lemmon Survey |
| Discovery site | Summerhaven, Arizona, US |
| Discovery date | 11 July 2005 |
| Designations | |
| 2005 NB56 | |
| Orbital characteristics[2] | |
| 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) |
| 1.64261 AU (245.731 Gm) | |
| Eccentricity | 0.47270 |
| 2.11 yr (768.95 d) | |
| 266.58° | |
| 0° 28m 5.412s /day | |
| Inclination | 6.7671° |
| 112.109° | |
| 114.48° | |
| Earth MOID | 0.0154071 AU (2,304,870 km) |
| Jupiter MOID | 2.58553 AU (386.790 Gm) |
| Physical characteristics | |
| ~170 m[3] | |
| 23.33[2] | |
2005 NB56, also written as 2005 NB56, is a near-Earth asteroid of the Apollo group.[2] 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.[4]
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."[4]
This object made a close approach to Earth when it was discovered in 2005 and will do so again in 2045.[5] 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.[2]
References
- ^ "2005 NB56". Minor Planet Center. Retrieved 9 August 2017.
- ^ a b c d "(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].
- ^ a b 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
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