astro.wikisort.org - Asteroid

20898 Fountainhills, provisional designation 2000 WE₁₄₇, is a dark asteroid in a cometary orbit (ACO) from the outermost regions of the asteroid belt, approximately 37 kilometers (23 miles) in diameter. It was discovered on 30 November 2000, by American amateur astronomer Charles W. Juels at the Fountain Hills Observatory in Arizona, United States.[1] The D-type asteroid has a rotation period of 12.84 hours.[3] It was named for the city of Fountain Hills, Arizona, in the United States.[1]

20898 Fountainhills

Discovery [1]
Discovered by	C. W. Juels
Discovery site	Fountain Hills Obs.
Discovery date	30 November 2000
Designations
MPC designation	(20898) Fountainhills
Named after	Fountain Hills [1] (U.S. city in Arizona)
Alternative designations	2000 WE147 · 1975 BE 1994 NA1
Minor planet category	main-belt [1][2] · (outer) [2][3] background [4] · ACO [5]: 872
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc	66.49 yr (24,285 d)
Aphelion	6.1881 AU
Perihelion	2.2572 AU
Semi-major axis	4.2226 AU
Eccentricity	0.4654
Orbital period (sidereal)	8.68 yr (3,169 d)
Mean anomaly	328.44°
Mean motion	0° 6m 48.96s / day
Inclination	45.523°
Longitude of ascending node	293.19°
Argument of perihelion	234.78°
Jupiter MOID	0.5295 AU
TJupiter	2.3490
Physical characteristics
Mean diameter	37.08 km (derived)[3] 37.31±1.1 km[6] 41.53±0.85 km[7]
Synodic rotation period	12.84±0.03 h[8]
Geometric albedo	0.0200 (derived)[3] 0.037±0.007[7] 0.0505±0.003[6]
Spectral type	D [3][5] B–V = 0.767±0.008[9] V–R = 0.428±0.010[9] V–I = 0.826±0.008[9]
Absolute magnitude (H)	11.0[6] · 11.10[2][7] 12.02[3][8]

Orbit and classification

Fountainhills is a non-family from the main belt's background population.[4] For an object in the asteroid belt, its orbit is extremely eccentric and highly inclined. With a Jupiter tisserand (T_Jupiter) of less than 3 and with no observable coma, it is an asteroid in cometary orbit (ACO) and a candidate for being a dormant or extinct comet.[5] It is however, not a damocloid based on current orbital criteria, which typically have a T_Jupiter of less than 2 (also see List of damocloids).

The asteroid orbits the Sun in the outer main-belt at a distance of 2.3–6.2 AU once every 8 years and 8 months (3,169 days; semi-major axis of 4.22 AU). Its orbit has an eccentricity of 0.47 and an inclination of 46° with respect to the ecliptic.[2] The body's observation arc begins with a precovery taken at Palomar Observatory during the Digitized Sky Survey in July 1951, more than 49 years prior to its official discovery observation at Fountain Hills.[1]

Fountainhills is the second most eccentric object as large as it is inside the orbit of Jupiter (after 1036 Ganymed), and the most highly inclined object of its size within the orbit of Jupiter. While its aphelion is outside that of Jupiter's orbit, it is so highly inclined that its furthest point from the Sun is far out of the ecliptic.^{[citation needed]}

Physical characteristics

Fountainhills has been characterized as a dark D-type asteroid in a study of asteroids in cometary orbits using the Nordic Optical Telescope at Roque de los Muchachos Observatory on the Canary Island, Spain.[5]

Rotation period

In January 2001, a rotational lightcurve of Fountainhills was obtained from photometric observations by American amateur astronomer Bill Holliday at River Oaks Observatory (915) in Texas. Lightcurve analysis gave a well-defined rotation period of 12.84 hours with a brightness amplitude of 0.20 magnitude (U=3).[8]

Diameter and albedo

According to the survey carried out by the Infrared Astronomical Satellite IRAS, and on data obtained by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Fountainhills measures between 37.31 and 41.53 kilometers in diameter and its surface has an albedo between 0.037 and 0.0505.[6][7] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.02 and a diameter of 37.08 kilometers based on an absolute magnitude of 12.02.[3]

Naming

This minor planet was named after the town of Fountain Hills, located near the Sonoran desert on the foothills of the McDowell Mountains, home to one of the world's tallest water fountains. The official naming citation was published by the Minor Planet Center on 9 May 2001 (M.P.C. 42678).[10]

References

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (20001)-(25000) – Minor Planet Center
• 20898 Fountainhills at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 20898 Fountainhills at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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- [en] 20898 Fountainhills

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[ru] (20898) Фаунтинхилс

(20898) Фаунтинхилс (лат. Fountainhills) — небольшой астероид внешней части главного пояса. Он был открыт 30 ноября 2000 года американским астрономом Чарльзом Джулзом в обсерватории Фаунтин-Хилс и назван в честь одноимённого города[en] в Аризоне[1].

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