astro.wikisort.org - Asteroid

2483 Guinevere /ˈɡwɪnɪvɪər/ is a dark and elongated Hilda asteroid from the outermost regions of the asteroid belt, approximately 43 kilometers (27 miles) in diameter. The asteroid was discovered on 17 August 1928, by German astronomer Max Wolf at Heidelberg Observatory in southwest Germany and given the provisional designation 1928 QB.[3] In the 1980s, it was named after King Arthur's wife Guinevere.[2]

2483 Guinevere

Shape model of Guinevere from its lightcurve
Discovery [1]
Discovered by	M. F. Wolf
Discovery site	Heidelberg Obs.
Discovery date	17 August 1928
Designations
MPC designation	(2483) Guinevere
Pronunciation	/ˈɡwɪnɪvɪər/
Named after	Guinevere (Arthurian legend)[2]
Alternative designations	1928 QB · 1929 VR 1955 FZ1 · 1961 VM 1961 XR · 1971 BM 1971 FN · 1977 XL A921 WF
Minor planet category	main-belt · (outer) [1] Hilda [3][4][5]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	88.51 yr (32,327 days)
Aphelion	5.0733 AU
Perihelion	2.8687 AU
Semi-major axis	3.9710 AU
Eccentricity	0.2776
Orbital period (sidereal)	7.91 yr (2,890 days)
Mean anomaly	4.7663°
Mean motion	0° 7m 28.56s / day
Inclination	4.5000°
Longitude of ascending node	252.04°
Argument of perihelion	183.36°
Jupiter MOID	0.2309 AU
Physical characteristics
Mean diameter	35.687±0.180 km[6] 42.42±2.89 km[7] 44.14 km (derived)[5] 44.17±3.9 km[8]
Synodic rotation period	14.730±0.002 h[9][lower-alpha 1] 14.73081±0.00001 h[10] 14.733 h[11]
Geometric albedo	0.0396 (derived)[5] 0.0433±0.009[8] 0.048±0.007[7] 0.067±0.011[6]
Spectral type	C [5]
Absolute magnitude (H)	10.8[7][8] · 10.9[1][5]

Classification and orbit

Hildian asteroid

Located in the outermost part of the main-belt, Guinevere is a member of the Hilda family, a large group of asteroids that are thought to have originated from the Kuiper belt. They orbit in a 3:2 orbital resonance with the gas giant Jupiter, meaning that for every 2 orbits Jupiter completes around the Sun, a Hildian asteroid will complete 3 orbits. Based on a numerical integration, Guinevere is the Hilda asteroid with the greatest chance of impacting with another asteroid.[4] About 74% of the impact risk occurs when Guinevere is relatively close to perihelion and approaches the main-belt asteroids.

Orbit

Guinevere orbits the Sun at a distance of 2.9–5.1 AU once every 7 years and 11 months (2,890 days). Its orbit has an eccentricity of 0.28 and an inclination of 5° with respect to the ecliptic.[1] In November 1921, it was first identified as A921 WF at Bergedorf Observatory in Hamburg, Germany. The body's observation arc begins two nights after its official discovery observation at Heidelberg in August 1928.[3]

Naming

This minor planet was named after Guinevere, the wife of King Arthur and the lover of Lancelot in Arthurian legend, after whom the minor planets (2041) and (2597) are named. This affair lead to civil war between King Arthur and his chief knight, who rescued Guinevere from burning at the stake, and initiated the downfall of Arthur's idyllic kingdom.[2] The name was suggested by Frederick Pilcher and the proposal was submitted by Edward Bowell, who also made the object's key identification.[2] The approved naming citation was published by the Minor Planet Center on 24 July 1983 (M.P.C. 8064).[12]

Physical characteristics

Lightcurves

During a survey of Hilda asteroids in the 1990s, a rotational lightcurve of Guinevere was obtained from photometric observations by an international collaboration of Swedish, German and Italian astronomers. Lightcurve analysis gave a well-defined rotation period of 14.733 hours with a brightness variation of 1.38 magnitude (U=3).[11] Guinevere is a high-amplitude Hilda. A high brightness amplitude typically indicates that the body is elongated and has a non-spheroidal shape. Thermal emission measurements from the Wide-field Infrared Survey Explorer (WISE) gave an even higher amplitude of 1.53 magnitude.[13]^: 15, 24 In October 2016, another lightcurve of Guinevere was obtained at the Center for Solar System Studies (CS3), Landers, in the Southern California desert, during a photometric survey conducted by American astronomers Dan Coley, Robert Stephens and Brian Warner (U80–U82). It showed a period of 14.730 hours with an amplitude of 0.89 magnitude (U=3-).[9][lower-alpha 1]

A 2016-published lightcurve, using modeled photometric data from the Lowell Photometric Database (LPD), gave a concurring period of 14.73081 hours (U=n.a.), as well as two spin axis of (19.0°, 70.0°) and (194.0°, 59.0°) in ecliptic coordinates (λ, β).[10]

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 WISE spacecraft, Guinevere measures between 35.687 and 44.17 kilometers in diameter and its surface has an albedo between 0.0433 and 0.067.[6][7][8] The Collaborative Asteroid Lightcurve Link agrees with IRAS and derives an albedo of 0.0396 and a diameter of 44.14 kilometers based on an absolute magnitude of 10.9.[5]

Notes

References

External links

• Lightcurve Database Query (LCDB), at www.minorplanet.info
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Geneva Observatory, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 2483 Guinevere at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 2483 Guinevere at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (2483) Guinevere

(2483) Guinevere ist ein Asteroid des Hauptgürtels, der am 17. August 1928 vom deutschen Astronomen Max Wolf in Heidelberg entdeckt wurde.

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- [en] 2483 Guinevere

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[es] (2483) Guinevere

(2483) Guinevere es un asteroide perteneciente al cinturón exterior de asteroides descubierto el 17 de agosto de 1928 por Maximilian Franz Wolf desde el Observatorio de Heidelberg-Königstuhl, Alemania.

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[ru] (2483) Гвиневра

(2483) Гвиневра (лат. Guinevere) — астероид внешней части главного пояса, который входит в состав семейства Хильды. Он был открыт 17 августа 1928 года немецким астрономом Максом Вольфом в обсерватории Хайдельберг и назван в честь супруги короля Артура Гвиневры[1].

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