Astronomy:2005 NB56
| Discovery[1] | |
|---|---|
| Discovered by | Mount Lemmon Survey |
| Discovery site | Summerhaven, Arizona, US |
| Discovery date | 11 July 2005 |
| Designations | |
| 2005 NB56 | |
| Minor planet category | |
| Orbital characteristics[2] | |
| Epoch 14 July 2005 (JD 2453565.5) | |
| Uncertainty parameter 7 | |
| Observation arc | 17[1] d |
| |{{{apsis}}}|helion}} | 2.41707 astronomical unit|AU (361.589 Gm) |
| |{{{apsis}}}|helion}} | 0.86585 AU (129.529 Gm) |
| 1.64146 AU (245.559 Gm) | |
| Eccentricity | 0.47251 |
| Orbital period | 2.10 yr (768.15 d) |
| Mean anomaly | 25.175° |
| Mean motion | 0° 28m 7.176s /day |
| Inclination | 6.7563° |
| Longitude of ascending node | 112.359° |
| 114.15° | |
| Earth MOID | 0.0163799 AU (2,450,400 km) |
| Jupiter MOID | 2.5887 AU (387.26 Gm) |
| Physical characteristics | |
| Mean diameter | ~170 m[3] |
| Absolute magnitude (H) | 22.9[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 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.[2]
References
- ↑ 1.0 1.1 "2005 NB56". Minor Planet Center. http://www.minorplanetcenter.net/db_search/show_object?utf8=%E2%9C%93&object_id=2005+NB56. Retrieved 9 August 2017.
- ↑ 2.0 2.1 2.2 2.3 "(2005 NB56)". JPL Small-Body Database. Jet Propulsion Laboratory. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3283898.
- ↑ 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].
- ↑ 4.0 4.1 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. https://newton.spacedys.com/neodys/index.php?pc=1.1.8&n=2005NB56. Retrieved 19 May 2009.
External links
- 2005 NB56 at the JPL Small-Body Database
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