Английская Википедия:2015 TB145
Шаблон:Use dmy dates Шаблон:Infobox planet Шаблон:Mp is a sub-kilometer asteroid, classified as near-Earth object and potentially hazardous asteroid of the Apollo group, approximately Шаблон:Convert in diameter.[1] It safely passed 1.27 lunar distances from Earth on 31 October 2015 at 17:01 UTC,[2] and passed by Earth again in November 2018.
Discovery
The asteroid was first observed on 10 October 2015 by Pan-STARRS at an apparent magnitude of 20 using a Шаблон:Convert Ritchey–Chrétien telescope.[3][4]Шаблон:Refn The asteroid was not discovered sooner because it spends most of its time beyond the orbit of Mars, has a large orbital inclination, and is usually well below the plane of the ecliptic.[5] The asteroid last passed within Шаблон:Convert of Earth on 29 October 1923 and will not pass that close again until 1 November 2088.[2]
The media has nicknamed the asteroid the "Great Pumpkin"[6] after the animated Halloween television special It's the Great Pumpkin, Charlie Brown,[7] "Spooky",[8] the "Halloween Asteroid",[9][10] and the "Skull Asteroid"[7] due to its skull-like appearance following radio frequency images taken at Arecibo Observatory and closest approach coincidentally occurring on Halloween day.[7]
2015 flyby
On 31 October 2015 the asteroid passed Шаблон:Convert from the Moon and then passed Шаблон:Convert from Earth.[2]
The last approach this close by an object with absolute magnitude brighter than 20 was Шаблон:Mpl on 3 July 2006 at 1.1 lunar distances. The next object this large known to pass this close to Earth is Шаблон:Mpl that will pass about 1 lunar distance from Earth on 7 August 2027.[11] It is estimated that there are about 2400 near-Earth asteroids 300–500 meters in diameter, of which about 1100 have been discovered.[12]
During closest approach to Earth the asteroid reached about apparent magnitude 10,[13] which is much too faint to be seen by the naked eye. Even at peak brightness, the asteroid was a challenging target for amateur astronomers with small telescopes, best seen in the Northern hemisphere. The glare from an 80% waning gibbous Moon also hindered observations.Шаблон:Citation needed
At 11:00 UT the asteroid was in the constellation of Taurus about 9 degrees from the Moon and moving at a rate of 3.4 degrees per hour.[13] At the time of closest approach of 17:00 UT the asteroid was in the constellation of Ursa Major about 56 degrees from the Moon and moving at a rate of 14.7 degrees per hour.[13] After closest approach it quickly became too faint and too close to the Sun in the sky to be seen.[11]
Шаблон:Large near earth asteroid flybys 2LD
2018 flyby
After it had been unobservable for almost three years, Шаблон:Mp was recovered on 7 October 2018 by L. Buzzi at Schiaparelli Observatory (observatory code 204), at apparent magnitude 21.[14]
The 11 November 2018 flyby was about Шаблон:Convert from Earth.[2][15]
Observations
Radar imagery
The close approach was studied with radar using Goldstone, the Green Bank Telescope,[11] and the Arecibo Observatory. It was one of the best radar targets of the year with a resolution as high as Шаблон:Convert per pixel.[11] Bistatic radar images created with the Green Bank Telescope had a resolution of Шаблон:Convert per pixel.[16] Arecibo images had a resolution of Шаблон:Convert per pixel.[17]
| 30 October | 31 October 12:55–13:08 UTC |
1 November |
|---|---|---|
| Файл:PIA20041-Asteroid-2015TB145-Animation-20151030.gif | Файл:Halloween asteroid rotation animation.gif | Файл:2015TB145 November 1.webm |
Possible cometary origin
The high orbital inclination and eccentricity suggest Шаблон:Mp may be an extinct comet that has shed its volatiles after numerous passes around the Sun.[17][18] Orbital calculations by Petrus Jenniskens and Jérémie Vaubaillon showed that it was not expected to produce associated meteors in 2015.[19] Any meteoroids were expected to pass more than Шаблон:Convert from Earth's orbit.[19]
If meteoroids related to this asteroid were to cross Earth's path, the radiant is expected to be near Northern Eridanus.[19] Cameras for Allsky Meteor Surveillance (CAMS) did not detect any activity in the presumed area of the sky during 2013 and 2014.[19] The object has a low albedo of 0.06, which is only slightly more than a typical comet that has an albedo of 0.03-0.05.[17]
Notes
References
External links
- ALERT! Bright NEO 2015 TB145 on 29–31 October 2015Шаблон:Snd Ian Musgrave (itelescope)
- WebCite archive of JPL solution #2 from 14 October 2015
- Halloween Asteroid is a Radar Science Treat (NASA Jet Propulsion Laboratory on YouTube)
- Halloween Asteroid 2015 TB145 Flyby Jerry Hilburn, 10/31/2015 12:12-12:24AM, Catfish Observatory, Teirra Del Sol, Canon 5D and an Orion ED 80 Refractor on an AVX Celestron Mount
- Шаблон:NeoDys
- Шаблон:ESA-SSA
- Шаблон:JPL small body
Шаблон:2015 in space Шаблон:Planetary defense Шаблон:Small Solar System bodies Шаблон:Authority control
- ↑ Ошибка цитирования Неверный тег
<ref>; для сносокMuller2017не указан текст - ↑ 2,0 2,1 2,2 2,3 Ошибка цитирования Неверный тег
<ref>; для сносокjpl-closeне указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокMPEC2015-T86не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокmpcне указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокST20151022не указан текст - ↑ Шаблон:Cite news
- ↑ 7,0 7,1 7,2 Шаблон:Cite news
- ↑ Шаблон:Cite news
- ↑ Шаблон:Cite news
- ↑ Шаблон:Cite news
- ↑ 11,0 11,1 11,2 11,3 Ошибка цитирования Неверный тег
<ref>; для сносокGoldstoneне указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокpia14734не указан текст - ↑ 13,0 13,1 13,2 Ошибка цитирования Неверный тег
<ref>; для сносокNEODyS2015не указан текст - ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Ошибка цитирования Неверный тег
<ref>; для сносокPIA20043не указан текст - ↑ 17,0 17,1 17,2 Ошибка цитирования Неверный тег
<ref>; для сносокOct30 2015не указан текст - ↑ Шаблон:Cite news
- ↑ 19,0 19,1 19,2 19,3 Ошибка цитирования Неверный тег
<ref>; для сносокCBET4154не указан текст
- Страницы с игнорируемыми отображаемыми названиями
- Английская Википедия
- Страницы с неработающими файловыми ссылками
- Apollo asteroids
- Minor planet object articles (unnumbered)
- Extinct comets
- Venus-crossing asteroids
- Mercury-crossing asteroids
- Potentially hazardous asteroids
- Discoveries by Pan-STARRS
- Near-Earth objects in 2015
- Astronomical objects discovered in 2015
- Страницы, где используется шаблон "Навигационная таблица/Телепорт"
- Страницы с телепортом
- Википедия
- Статья из Википедии
- Статья из Английской Википедии
- Страницы с ошибками в примечаниях
