Английская Википедия:(341843) 2008 EV5

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Шаблон:Short description

Шаблон:Use dmy dates Шаблон:Infobox planet

Шаблон:Mp, provisional designation Шаблон:Mp, is a sub-kilometer asteroid, classified as a near-Earth object and potentially hazardous asteroid of the Aten group, approximately Шаблон:Convert in diameter. It was discovered on 4 March 2008, by astronomers of the Mount Lemmon Survey at Mount Lemmon Observatory near Tucson, Arizona, United States.[1]

Origin and orbital history

Шаблон:Mp started its existence as part of a much larger body in the asteroid belt, with a likely diameter greater than 100 kilometers.[2] Шаблон:Mp's immediate history likely started when its parent body experienced a large cratering event or, more likely, a catastrophic disruption event that resulted in a highly fractured, shattered, or reaccumulated object (rubble pile). As a result, Шаблон:Mp may have been produced as a reassembly of ejected fragments. The location of what is now Шаблон:Mp within this parent body is unknown.[3]

Given the available modeling work and data, the most plausible source family candidates for Шаблон:Mp are Eulalia, New Polana, and Erigone. This assumes that Шаблон:Mp's true albedo is considerably lower than 10%. If it does have a high albedo, a plausible source would be a population of high-albedo C-type asteroids in the inner asteroid belt. Second tier candidate families for the high-albedo case are Baptistina and Pallas.[3]

From here, the newly liberated Шаблон:Mp began to change via the forces referred to as the Yarkovsky and YORP effects. The Yarkovsky effect describes a small force that affects orbital motion. It is caused by sunlight; when objects heat up in the Sun, they reradiate the energy away as heat, which in turn creates a tiny thrust. This recoil acceleration is much weaker than solar and planetary gravitational forces, but it can produce substantial orbital changes over timescales ranging from many millions to billions of years. The same physical phenomenon also creates a thermal torque that probably caused Шаблон:Mp to take on a top-like appearance.[4][3][5]

Dynamical models indicate that Шаблон:Mp migrated inward across the inner asteroid belt over long timescales (i.e. the order of ~0.01–1 Gyr) until it reached a planetary gravitational resonance that drove it into the near-Earth asteroid (NEA) population over a timescale of the order of ~1 Myr. From there, gravitational interactions with both the planets and resonances allowed it to reach its current orbit within a few Myr to a few tens of Myr.[3]

Close approaches

On 23 December 2008, Шаблон:Mp made a close approach to Earth at a distance of 8.4 lunar distances (0.022 AU, 3.2 million km), its closest until 2169.[4] Its brightness peaked on 26 December about 13.2 magnitude.

Файл:2008 EV5 skyview 2008.png
2008 Path of Шаблон:Mp close approach, with 3 day motion markers
Earth Approach on 20 December 2023[6]
Date JPL Horizons
nominal geocentric
distance (AU) 		uncertainty
region
(3-sigma)
2023-Dec-20 06:52 Шаблон:Convert[6] ±Шаблон:Val[7]

Physical characteristics

Файл:Asteroid-2008EV5-ShapeModel-20111006.gif
Radar-based shape model of Шаблон:Mp

Шаблон:Mp is an oblate spheroid (also described as "muffin-shaped"[8]) Шаблон:Convert in diameter. It rotates very slowly in a retrograde direction. There is a Шаблон:Convert diameter concave feature, possibly an impact crater, or a relic feature from a previous episode of rapid rotation that caused the asteroid's shape to reconfigure.[4]

Visible and near-infrared spectroscopy show that Шаблон:Mp's composition is similar to that of carbonaceous chondrite meteorites.[9] Шаблон:Clear left

Proposed sample return mission

Шаблон:Mp was the preliminary baseline target of NASA's proposed sample-return Asteroid Redirect Mission. Besides Шаблон:Mp, several other asteroids, including Itokawa and Bennu, were considered for this mission,[10][11] before its cancellation in 2017.

See also

References

Шаблон:Reflist

External links

Шаблон:Minor planets navigator Шаблон:Small Solar System bodies Шаблон:Authority control

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  1. ↑ Ошибка цитирования Неверный тег <ref>; для сносок MPC-object не указан текст
  2. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Morbidelli-2009 не указан текст
  3. ↑ 3,0 3,1 3,2 3,3 Ошибка цитирования Неверный тег <ref>; для сносок ARM не указан текст
  4. ↑ 4,0 4,1 4,2 Ошибка цитирования Неверный тег <ref>; для сносок Busch-2011 не указан текст
  5. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Walsh-2008 не указан текст
  6. ↑ 6,0 6,1 Ошибка цитирования Неверный тег <ref>; для сносок jpldata не указан текст
  7. ↑ Ошибка цитирования Неверный тег <ref>; для сносок CA2023 не указан текст
  8. ↑ Шаблон:Cite news
  9. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Reddy-2012 не указан текст
  10. ↑ Ошибка цитирования Неверный тег <ref>; для сносок NASA-20150325-DES не указан текст
  11. ↑ Ошибка цитирования Неверный тег <ref>; для сносок AP-20150325 не указан текст
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