Английская Википедия:(31345) 1998 PG

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Шаблон:Infobox planet

Шаблон:Mp is an eccentric, stony asteroid and binary system, classified as near-Earth object of the Amor group of asteroids, approximately 900 meters in diameter. It minor-planet moon, S/2001 (31345) 1, has an estimated diameter of 270 meters.

This asteroid was discovered on 3 August 1998, by the Lowell Observatory Near-Earth-Object Search (LONEOS) at Anderson Mesa Station, near Flagstaff, Arizona, United States.[1]

Orbit

Шаблон:Mp orbits the Sun at a distance of 1.2–2.8 AU once every 2 years and 10 months (1,046 days). Its orbit has an eccentricity of 0.39 and an inclination of 7° with respect to the ecliptic.[2] A first precovery was taken at Palomar Observatory in 1978, extending the body's observation arc by 20 years prior to its official discovery observation at Anderson Mesa.[1]

Close approaches

The asteroid has an Earth minimum orbital intersection distance of Шаблон:Convert, which translates into approximately 92 lunar distances. It has made multiple close approaches to Earth, with the closest being 35,648,680 kilometers on 15 October 1978.[2] With an aphelion of more than 2.8 AU, Шаблон:Mp is also a Mars-crosser.

Physical characteristics

Spectral type

In the SMASS taxonomy, Шаблон:Mp is classified as a transitional Sq-type, which is an intermediary between the common stony S-type and the less frequent Q-type asteroids.[2]

Diameter and albedo

According to the 2006-published Photometric survey of binary near-Earth asteroids by Petr Pravec and derived data from the Collaborative Asteroid Lightcurve Link and the "Johnston's archive", Шаблон:Mp measures between 880 and 940 meters in diameter and its surface has an albedo of 0.18 and 0.20, respectively.[3][4][5]Шаблон:Efn

Rotation

In the late 1990s, a rotational lightcurve of Шаблон:Mp was obtained from photometric observations by Hungarian astronomers László Kiss, Gyula Szabó and Krisztián Sárneczky. Lightcurve analysis gave a rotation period of 2.5 hours with a brightness variation of 0.1 magnitude (Шаблон:Small).[6]

A second lightcurve obtained and published in 2000, by an international collaboration of astronomers gave a rotation period of Шаблон:Val hours with a brightness amplitude of 0.11 magnitude (Шаблон:Small).[7]

Moon

During the second photometric observation, it was discovered that Шаблон:Mp is a probable/possible asynchronous binary system with a minor-planet moon orbiting it every 7.0035 hours,[5] or twice this period solution.[3]

The moon's provisional designation is Шаблон:Mp.[3] The system has an estimated secondary-to-primary mean-diameter ratio of more than 0.3,[7]Шаблон:Efn which translates into a diameter of 270 meter for the satellite.[3] The "Johnston's archive" also estimates that the moon's orbit has a semi-major axis of 1.4 kilometers.[3]

From the surface of Шаблон:Mp, the moon would have an angular diameter of about 16.3°.Шаблон:Efn For comparison, the Sun appears to be 0.5° from Earth.

Numbering and naming

This minor planet was numbered by the Minor Planet Center on 30 November 2001.[8] As of 2018, it has not been named.[1]

Gallery

Notes

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Шаблон:Efn

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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 Ошибка цитирования Неверный тег <ref>; для сносок jpldata не указан текст
  3. ↑ 3,0 3,1 3,2 3,3 3,4 Ошибка цитирования Неверный тег <ref>; для сносок johnstonsarchive не указан текст
  4. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Pravec-2006 не указан текст
  5. ↑ 5,0 5,1 Ошибка цитирования Неверный тег <ref>; для сносок lcdb не указан текст
  6. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Kiss-1999 не указан текст
  7. ↑ 7,0 7,1 Ошибка цитирования Неверный тег <ref>; для сносок Pravec-2000b не указан текст
  8. ↑ Ошибка цитирования Неверный тег <ref>; для сносок MPC-Circulars-Archive не указан текст
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