Английская Википедия:1362 Griqua
1362 Griqua, provisional designation Шаблон:Mp is a dark, Jupiter-resonant background asteroid on an eccentric, cometary-like orbit and the namesake of the Griqua group, located in the Hecuba gap in the outermost region of the asteroid belt.[1] The carbonaceous asteroid measures approximately Шаблон:Convert in diameter and has a rotation period of 6.9 hours.[2] It was discovered on 31 July 1935, by South-African astronomer Cyril Jackson at Union Observatory in Johannesburg.[3] The asteroid was named after the Griqua people in South Africa and Namibia.[4]
Orbit and classification
Griqua is an asteroid in a cometary orbit (ACO), with no observable coma but with a Tisserand's parameter of 2.95,[5] below the threshold of 3.0 defined for main-belt asteroids. ACO's may be extinct comets.[6] It is the namesake and largest member of the small dynamical Griqua group (known as the "Griquas"), a marginally unstable group of asteroids observed in the Hecuba gap, a resonant zone with the gas giant Jupiter (2/1J).[1] Griqua itself is background asteroids and does not belong to any known asteroid family.[7]
This asteroid orbits the Sun in the outermost asteroid belt at a distance of 2.0–4.4 AU once every 5 years and 9 months (2,107 days; semi-major axis of 3.22 AU). Its orbit has a high eccentricity of 0.37 and an inclination of 24° with respect to the ecliptic.[5]
The body's observation arc begins with its first observation as Шаблон:Mp at Lowell Observatory in January 1931, more than 4 years prior to its official discovery observation at Johannesburg.[3]
Groups in the Hecuba gap
The marginally unstable Griqua group includes 3688 Navajo, 4177 Kohman and 11665 Dirichlet, while the stable 2:1 resonant group are the "Zhongguos", named after 3789 Zhongguo. The transition between these two groups, however, is not clear. The unnamed, third group in the Hecuba gap are strongly unstable. Their largest members are the asteroids 1921 Pala, 1922 Zulu and 5201 Ferraz-Mello, as well as 5370 Taranis, 8373 Stephengould, and 9767 Midsomer Norton.[1]Шаблон:Rp
Physical characteristics
In the Tholen classification, GriquaШаблон:'s spectral type is ambiguous, closest to a common C-type asteroid and somewhat similar to an primitive P-type asteroid (CP).[5][2] The asteroid has also been characterized as a "brighter" B-type asteroid in both the Tholen- and SMASS-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2).[6][8]
Rotation period
In November 2000, a rotational lightcurve of Griqua was obtained from photometric observations by Colin Bembrick at the Mount Tarana Observatory in Australia. Lightcurve analysis gave a well-defined rotation period of 6.907 hours with a brightness variation of 0.25 magnitude (Шаблон:Small).[9] In 2009, follow-up observations by Jean and Milan Strajnic Шаблон:Obscode, Alain Klotz and Raoul Behrend as well as observations in the S-band by astronomers at the Palomar Transient Factory in California gave a concurring period of 6.891 and 6.9 hours with an amplitude of 0.23 and 0.24 magnitude, respectively (Шаблон:Small).[10][11] The result supersedes a measurement of 7 hours made in the 1970s (Шаблон:Small).[12]
Diameter and albedo
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Griqua measures between 25.60 and 30 kilometers in diameter and its surface has an albedo between 0.0667 and 0.091.[13][14][15][16][17][18][19]
The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0667 with a diameter of 29.90 kilometers based on an absolute magnitude of 11.18,[2] while fragmentary radiometric observations in the 1970s determined a diameter of 31.0 kilometer and a derived albedo of 0.055 (TRIAD).[7]Шаблон:Efn
Naming
This minor planet is named after the Afrikaans-speaking Griqua people, a mixed tribe of Bushman and Khoikhoi descent in Griqualand in South Africa and Namibia. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (Шаблон:Small).[4]
Notes
References
External links
- Asteroids in Cometary Orbits (ACOs), Instituto de Astrofísica de Canarias
- Asteroid Lightcurve Database (LCDB), query form (info Шаблон:Webarchive)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- Шаблон:AstDys
- Шаблон:JPL small body
Шаблон:Use dmy dates Шаблон:Minor planets navigator Шаблон:Small Solar System bodies
- ↑ 1,0 1,1 1,2 Ошибка цитирования Неверный тег
<ref>
; для сносокRoig-2002
не указан текст - ↑ 2,0 2,1 2,2 Ошибка цитирования Неверный тег
<ref>
; для сносокlcdb
не указан текст - ↑ 3,0 3,1 Ошибка цитирования Неверный тег
<ref>
; для сносокMPC-object
не указан текст - ↑ 4,0 4,1 Ошибка цитирования Неверный тег
<ref>
; для сносокspringer
не указан текст - ↑ 5,0 5,1 5,2 Ошибка цитирования Неверный тег
<ref>
; для сносокjpldata
не указан текст - ↑ 6,0 6,1 Ошибка цитирования Неверный тег
<ref>
; для сносокLicandro-2008
не указан текст - ↑ 7,0 7,1 Ошибка цитирования Неверный тег
<ref>
; для сносокFerret
не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>
; для сносокLazzaro-2004
не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>
; для сносокBembrick-2001a
не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>
; для сносокWaszczak-2015
не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>
; для сносокgeneva-obs
не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>
; для сносокTaylor-1976
не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>
; для сносокMasiero-2012
не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>
; для сносокMasiero-2011
не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>
; для сносокWISE
не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>
; для сносокAKARI
не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>
; для сносокSIMPS
не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>
; для сносокAli-Lagoa-2016
не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>
; для сносокAli-Lagoa-2013
не указан текст
- Английская Википедия
- Griqua asteroids
- Background asteroids
- Discoveries by Cyril Jackson (astronomer)
- Named minor planets
- CP-type asteroids (Tholen)
- Astronomical objects discovered in 1935
- Страницы, где используется шаблон "Навигационная таблица/Телепорт"
- Страницы с телепортом
- Википедия
- Статья из Википедии
- Статья из Английской Википедии
- Страницы с ошибками в примечаниях