astro.wikisort.org - Asteroid

4827 Dares /ˈdɛəriːz/ is a larger Jupiter trojan from the Trojan camp, approximately 43 kilometers (27 miles) in diameter. It was discovered on 17 August 1988 by American astronomer Carolyn Shoemaker at the Palomar Observatory in California.[1] The dark D-type asteroid has a rotation period of 19.0 hours.[7] It was named after Dares from Greek mythology.[1]

4827 Dares

Discovery [1]
Discovered by	C. Shoemaker
Discovery site	Palomar Obs.
Discovery date	17 August 1988
Designations
MPC designation	(4827) Dares
Pronunciation	/ˈdɛəriːz/[2]
Named after	Dares (Greek mythology)[1]
Alternative designations	1988 QE
Minor planet category	Jupiter trojan [1][3] Trojan [4] · background [5]
Adjectives	Daretian
Orbital characteristics [3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc	63.49 yr (23,191 d)
Aphelion	5.3517 AU
Perihelion	4.8903 AU
Semi-major axis	5.1210 AU
Eccentricity	0.0451
Orbital period (sidereal)	11.59 yr (4,233 d)
Mean anomaly	119.05°
Mean motion	0° 5m 6.36s / day
Inclination	7.7056°
Longitude of ascending node	242.04°
Argument of perihelion	170.69°
Jupiter MOID	0.0037 AU
TJupiter	2.9800
Physical characteristics
Mean diameter	42.77±0.26 km[6] 44.22 km (calculated)[7]
Synodic rotation period	18.995±0.028 h[8]
Geometric albedo	0.057 (assumed)[7] 0.067±0.007[6]
Spectral type	D (Pan-STARRS)[7][9] D (SDSS-MOC)[10][11]
Absolute magnitude (H)	10.4[6] 10.5[1][3][7] 10.88±0.01[9]

Orbit and classification

Dares is a dark Jovian asteroid in a 1:1 orbital resonance with Jupiter. It is located in the trailering Trojan camp at the Gas Giant's L₅ Lagrangian point, 60° behind on its orbit (see Trojans in astronomy). It is also a non-family asteroid of the Jovian background population.[5] It orbits the Sun at a distance of 4.9–5.4 AU once every 11 years and 7 months (4,233 days; semi-major axis of 5.12 AU). Its orbit has an eccentricity of 0.05 and an inclination of 8° with respect to the ecliptic.[3]

The body's observation arc begins with a precovery at Palomar in November 1954, almost 34 years prior to its official discovery observation.[1]

Physical characteristics

In the SDSS-based taxonomy, Dares is a dark D-type asteroid.[10][11] It is also characterized as a D-type by Pan-STARRS' survey.[7][9]

Rotation period

In February 1994, a rotational lightcurve of Dares was obtained over five nights of observation by Stefano Mottola and Anders Erikson using the ESO 1-metre telescope at La Silla Observatory in Chile. Lightcurve analysis showed a well-defined rotation period of 18.995±0.028 hours with a brightness variation of 0.24 magnitude (U=3).[7][8]

In October 2013, photometric observations in the R-band by astronomers at the Palomar Transient Factory in California gave a concurring period of 18.967 hours with an amplitude of 0.23 magnitude (U=2).[7][12]

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Dares measures 42.77 kilometers in diameter and its surface has an albedo of 0.067,[6] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 44.22 kilometers based on an absolute magnitude of 10.5.[7]

Naming

This minor planet was named by the discoverer from Greek mythology after the Trojan Dares, one of Aeneas' wandering companions (Aeneads) who were not killed or enslaved by the end of the Trojan War.[1] The official naming citation was published by the Minor Planet Center on 25 August 1991 (M.P.C. 18647).[13]

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 (1)-(5000) – Minor Planet Center
• 4827 Dares at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 4827 Dares at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (4827) Dares

(4827) Dares ist ein Asteroid aus der Gruppe der Jupiter-Trojaner. Damit werden Asteroiden bezeichnet, die auf den Lagrange-Punkten auf der Bahn des Jupiter um die Sonne laufen. (4827) Dares wurde am 17. August 1988 von der US-amerikanischen Astronomin Carolyn Shoemaker entdeckt. Er ist dem Lagrangepunkt L5 zugeordnet.

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- [en] 4827 Dares

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[fr] (4827) Darès

(4827) Darès, désignation internationale (4827) Dares, est un astéroïde troyen jovien.

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[ru] (4827) Дарет

(4827) Дарет (лат. Dares, др.-греч. Δάρης) — типичный троянский астероид Юпитера, движущийся в точке Лагранжа L5, в 60° позади планеты. Астероид был открыт 17 августа 1988 года американским астрономом Кэролин Шумейкер в Паломарской обсерватории и назван в честь Дарета Фригийского, одного из героев Троянской войны[2].

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