Английская Википедия:(523622) 2007 TG422

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Шаблон:Short description

Шаблон:Use dmy dates Шаблон:Infobox planet Шаблон:Mp, provisional designation Шаблон:Mp, is a trans-Neptunian object on a highly eccentric orbit in the scattered disc region at the edge of Solar System. Approximately Шаблон:Convert in diameter, it was discovered on 3 October 2007 by astronomers Andrew Becker, Andrew Puckett and Jeremy Kubica during the Sloan Digital Sky Survey at Apache Point Observatory in New Mexico, United States.[1] According to American astronomer Michael Brown, the bluish object is "possibly" a dwarf planet.[2] It belongs to a group of objects studied in 2014, which lead to the proposition of the hypothetical Planet Nine.[3]

Orbit and classification

Шаблон:Mp orbits the Sun at a distance of 35.5–910 AU once every 10279 years and 9 months (3,754,688 days; semi-major axis of 473 AU). Its orbit has an exceptionally high eccentricity of 0.92 and an inclination of 19° with respect to the ecliptic.[4]

Шаблон:Mp is an extended scattered disc object,[5] as its large aphelion distance is similar to that of the detached objects such as the sednoids (e.g. 90377 Sedna), its perihelion distance, however, is much lower and still just inside the gravitational influence of Neptune.[6] The object came to perihelion in 2005 at a heliocentric distance of 35.5 AU,[4] and is currently 37.9 AU from the Sun.[7] It was in the constellation of Taurus until 2018, and came to opposition 29 November 2017. The body's observation arc begins at Apache Point in September 2007, one month prior to its official discovery observation.[1] It has since been observed over a hundred times and has an orbital uncertainty of 1.[4]

Unstable heliocentric solutions

Year[lower-alpha 1]
(epoch)		 Aphelion
(AU)		 Orbital
period
years
28 August 2007[6] 932 10652
30 September 2012[8] 1099 13512
16 February 2017[4] 917 10399
26 June 2018 901 10143
Stable
Barycentric
2017[9]		 970 11300

Given the orbital eccentricity of this object, different epochs can generate quite different heliocentric unperturbed two-body best-fit solutions to the aphelion (maximum distance from the Sun) of this object.[lower-alpha 2] With a 2007 epoch the object had an approximate period of about 10,611 years with aphelion at 930 AU.[6] But using a 2012 epoch shows a period of about 13,512 years with aphelion at 1099 AU.[8] For objects at such high eccentricity, the Sun's barycentric coordinates are more stable than heliocentric coordinates.[10] Using JPL Horizons with an observed orbital arc of 5 years, the barycentric orbital elements for epoch 2008-May-14 generate a semi-major axis of 503 AU and a period of 11,300 years.[9] For comparison, Sedna has a barycentric semi-major axis of 506 AU and a period of 11,400 years.[9] Both Шаблон:Mpl and Шаблон:Mpl take longer than Sedna and Шаблон:Mp to orbit the Sun using barycentric coordinates.

Numbering and naming

This minor planet was numbered by the Minor Planet Center on 25 September 2018 (Шаблон:Small).[11] As of 2018, it has not been named.[1]

Physical characteristics

Шаблон:Mp is expected to have a low albedo (see below) due to its blue (neutral) color.[2]

Diameter and albedo

According to the Johnston's archive and to Michael Brown, Шаблон:Mp measures 222 and 331 kilometers in diameter, based on an absolute magnitude of 6.5 and an assumed standard albedo of 0.09 and 0.04 for the body's surface, respectively.[5][2] As of 2018, no rotational lightcurve has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.[4][12] Michael Brown's website lists it as a possible dwarf planet.[2]

Comparison

Файл:Distant object orbits + Planet Nine.png
The orbits of Шаблон:Dp, Шаблон:Mpl, Leleākūhonua, and other very distant objects along with the predicted orbit of Planet Nine. The three sednoids (pink) along with the red-colored extreme trans-Neptunian object (eTNO) orbits are suspected to be aligned with the hypothetical Planet Nine while the blue-colored eTNO orbits are anti-aligned. The highly elongated orbits colored brown include centaurs and damocloids with large aphelion distances over 200 AU.

Notes

Шаблон:Reflist

References

Шаблон:Reflist

External links

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

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  1. ↑ 1,0 1,1 1,2 Ошибка цитирования Неверный тег <ref>; для сносок MPC-object не указан текст
  2. ↑ 2,0 2,1 2,2 2,3 Ошибка цитирования Неверный тег <ref>; для сносок Brown-dplist не указан текст
  3. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Trujillo-2014 не указан текст
  4. ↑ 4,0 4,1 4,2 4,3 4,4 Ошибка цитирования Неверный тег <ref>; для сносок jpldata не указан текст
  5. ↑ 5,0 5,1 Ошибка цитирования Неверный тег <ref>; для сносок johnstonsarchive-TNO-list не указан текст
  6. ↑ 6,0 6,1 6,2 Ошибка цитирования Неверный тег <ref>; для сносок Buie не указан текст
  7. ↑ Ошибка цитирования Неверный тег <ref>; для сносок AstDys-object не указан текст
  8. ↑ 8,0 8,1 Ошибка цитирования Неверный тег <ref>; для сносок epoch2012 не указан текст
  9. ↑ 9,0 9,1 9,2 Ошибка цитирования Неверный тег <ref>; для сносок barycenter не указан текст
  10. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Kaib-2009 не указан текст
  11. ↑ Ошибка цитирования Неверный тег <ref>; для сносок MPC-Circulars-Archive не указан текст
  12. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Ferret не указан текст


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