Английская Википедия:(84522) 2002 TC302

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Шаблон:Short description

Шаблон:Infobox planet

Шаблон:Mp, prov. designation: Шаблон:Mp, is a mid-sized trans-Neptunian object located in the outermost region of the Solar System. It was discovered on 9 October 2002, by American astronomers Mike Brown, Chad Trujillo and David Rabinowitz at the Palomar Observatory in California.[1] The resonant trans-Neptunian object stays in a 2:5 resonance with Neptune. It has a reddish color, a rotation period of 56.1 hours and measures at least Шаблон:Convert in diameter.

Orbit and classification

Шаблон:Mp orbits the Sun at a distance of 39.2–71.4 AU once every 410 years and 12 months (150,105 days; semi-major axis of 55.28 AU). Its orbit has an eccentricity of 0.29 and an inclination of 35° with respect to the ecliptic.[2] In December 2058, It will come to perihelion (minimum distance from the Sun) at 39.2 AU,[2] which is about the same as Pluto's semi-major axis (average distance from the Sun). Given the long orbit that TNOs have around the Sun, Шаблон:Mp comes to opposition in late October of each year at an apparent magnitude of 20.5.[3]

Both the Minor Planet Center (MPC) and the Deep Ecliptic Survey (DES) show Шаблон:Mp to be a resonant trans-Neptunian object in a 2:5 resonance with Neptune, meaning it completes two orbits for every five orbits of Neptune.[4][5][6] Шаблон:Multiple image

Physical characteristics

Файл:TheTransneptunians Size Albedo Color.svg
Comparison of Шаблон:Mp with selected other trans-Neptunian objects

Шаблон:Mp has an absolute magnitude of 3.78.[2] It has an estimated diameter of Шаблон:Val.[7] Using the Spitzer Space Telescope, it was previously estimated to have a diameter of Шаблон:Val,[8] which would have made it one of the largest TNOs. This overestimation was due to insufficient motion to allow for a good sky subtraction, and because Шаблон:Mp was very close to a brighter background object.[7] Brown noted that the Spitzer measurement involved a very large potential error and that the object would likely be much smaller.[9]

The red spectra suggests that Шаблон:Mp has very little fresh ice on its surface.[8] Its rotation period was initially estimated by Thirouin et al. to be 5.41 h, based on a light-curve amplitude of Шаблон:Val.[10] However, this short rotation period was most likely an alias due to a bias for shorter and more easily discernable shorter periods. Шаблон:Mp is highly oblate, and Ortiz et al. suggest a longer rotation period estimate of 56.1 hours.[11]

An occultation of a 15.3 magnitude star by Шаблон:Mp on 28 January 2018 over Europe suggests that it has highly oblate shape with dimensions of Шаблон:Val × Шаблон:Val and a projected axial ratio of a/c=1.18.[11] The area equivalent diameter of Шаблон:Mp is Шаблон:Val.[11]

On 11 November 2021, an occultation across North America and Europe detected an oblate shape of Шаблон:Val km (mean 499 km), in strong agreement with the 2018 occultation results. No satellites were detected.[12]

Possible satellite

The mean diameter of Шаблон:Mp determined from occultations in 2018 is smaller than the larger diameter estimate of Шаблон:Val by Spitzer in 2008. Despite the large uncertainty in the Spitzer's estimate, the difference of Шаблон:Val between the two diameters is significant, implying that Шаблон:Mp may have a large satellite with a possible size range of Шаблон:Val, nearly as large as Шаблон:Mp itself.[13] This possible satellite is expected to orbit Шаблон:Mp at a very close distance of less than Шаблон:Val, close enough to slow down Шаблон:Mp's rotation through tidal interactions.[11]

If both the primary body and satellite are doubly tidally locked, then the expected orbital period of the satellite would be approximately 54 hours, equal to Шаблон:Mp's rotation. Given an orbital period of 54 hours, the satellite's estimated orbital separation from the primary would be Шаблон:Val, with an angular separation of 58 milliarcseconds, too small to be resolved with current space telescopes such as Hubble. Under the assumption the satellite's diameter is Шаблон:Val, it would cause Шаблон:Mp's position to oscillate by 18 milliarcseconds as it orbits around its barycenter.[11]

See also

Notes

Шаблон:Notelist

References

Шаблон:Reflist

External links

Шаблон:Commons category

Шаблон:Minor planets navigator Шаблон:Dwarf planets Шаблон:Trans-Neptunian objects 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. ↑ 2,0 2,1 2,2 Ошибка цитирования Неверный тег <ref>; для сносок jpldata не указан текст
  3. ↑ Ошибка цитирования Неверный тег <ref>; для сносок ephemerides не указан текст
  4. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Buie-DES не указан текст
  5. ↑ Ошибка цитирования Неверный тег <ref>; для сносок johnstonsarchive-TNOs не указан текст
  6. ↑ Ошибка цитирования Неверный тег <ref>; для сносок MPEC 2009-C70 не указан текст
  7. ↑ 7,0 7,1 Ошибка цитирования Неверный тег <ref>; для сносок Fornasier-2013 не указан текст
  8. ↑ 8,0 8,1 Ошибка цитирования Неверный тег <ref>; для сносок spitzer не указан текст
  9. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Brown-dplist не указан текст
  10. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Thirouin-2012 не указан текст
  11. ↑ 11,0 11,1 11,2 11,3 11,4 Ошибка цитирования Неверный тег <ref>; для сносок Ortiz-2020 не указан текст
  12. ↑ Шаблон:Cite web
  13. ↑ Ошибка цитирования Неверный тег <ref>; для сносок sciencealert не указан текст
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