Английская Википедия:2009 BD
Шаблон:Mp is a very small asteroid, approximately 10 meters in diameter, which is classified as near-Earth object of the Apollo group and as an Earth co-orbital asteroid.
Orbit
During the 2011 opposition, the last opposition of Шаблон:Mp that was observed, Шаблон:Mp approached on June 2, 2011 within 0.00231 AU (346,000 km) of the Earth, which is less than 1 lunar distance. For comparison, the distance to the Moon is about 0.0026 AU (384,400 km).
With an orbital period of 369.99 days, Шаблон:Mp is in a near 1:1 orbital resonance with Earth, and also has about the same orbit around the Sun as Earth. Other resonant near-Earth objects in addition to Шаблон:Mp include Шаблон:Mpl (the first to be discovered), Шаблон:Mpl, Шаблон:Mpl, Шаблон:Mpl, Шаблон:Mpl, Шаблон:Mpl, Шаблон:Mpl, and Шаблон:Mpl (an Earth trojan).
The Jupiter Tisserand invariant, used to distinguish different kinds of orbits, is 6.039.[1] The orbit has a small inclination of about 0.4 degrees.
JPL[1] and MPC[2] give different parameters for the orbit of Шаблон:Mp, affecting whether the orbit type should be considered an Apollo asteroid or an Amor asteroid. JPL includes non-gravitational acceleration parameters in the orbital solution.
Physical characteristics
Because Шаблон:Mp is a very small multi-opposition near-Earth object, the effect of radiation pressure on the orbit caused by light from the Sun was able to be detected.[3] The radiation-related acceleration allowed the Area to Mass Ratio (AMR) to be estimated at (2.97 ± 0.33) × 10−4 m2/kg. Assuming an albedo of 0.12, a typical average for asteroids in the inner solar system, this AMR corresponds to a density of about 640 kg/m3. This density is consistent with the density of very porous rock. For comparison, the asteroid 2006 RH120 has a measured density of about 400 kg/m3, and the density of the asteroid 253 Mathilde as measured by the NEAR-Shoemaker space probe was 1300 kg/m3. In contrast, the density of the man-made near-Earth object 6Q0B44E is 15 kg/m3.
References
External links
Шаблон:Small Solar System bodies Шаблон:2011 in space Шаблон:Authority control
- ↑ 1,0 1,1 Ошибка цитирования Неверный тег
<ref>; для сносокorbitне указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокdiscovery refне указан текст - ↑ Шаблон:Cite journal
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