astro.wikisort.org - Asteroid

12052 Aretaon /ærɪˈteɪɒn/ is a mid-sized Jupiter trojan from the Trojan camp, approximately 40 kilometers (25 miles) in diameter. It was discovered on 3 May 1997, by Belgian astronomer Eric Elst at ESO's La Silla Observatory in northern Chile.[1] The dark Jovian asteroid has a rotation period of 8.05 hours.[6] It was named after Aretaon from Greek mythology.[1]

12052 Aretaon

Discovery[1]
Discovered by	E. W. Elst
Discovery site	La Silla Obs.
Discovery date	3 May 1997
Designations
MPC designation	(12052) Aretaon
Pronunciation	/ærɪˈteɪɒn/
Named after	Ἀρετάων Aretāōn[1] (Greek mythology)
Alternative designations	1997 JB16 · 1977 UG5 1999 NE62
Minor planet category	Jupiter trojan[1][2] Trojan[3] · background[4]
Orbital characteristics[2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc	40.60 yr (14,828 d)
Aphelion	5.5958 AU
Perihelion	4.8837 AU
Semi-major axis	5.2397 AU
Eccentricity	0.0680
Orbital period (sidereal)	11.99 yr (4,381 d)
Mean anomaly	197.23°
Mean motion	0° 4m 55.92s / day
Inclination	11.463°
Longitude of ascending node	219.79°
Argument of perihelion	85.727°
Jupiter MOID	0.256 AU
TJupiter	2.9550
Physical characteristics
Mean diameter	39.151±0.809 km[5] 42.23 km (calculated)[6]
Synodic rotation period	8.05 h[7]
Geometric albedo	0.057 (assumed)[6] 0.073±0.013[5]
Spectral type	C (assumed)[6]
Absolute magnitude (H)	10.425±0.002 (R)[8] 10.50[5] 10.6[1][2][6]

Orbit and classification

Aretaon is a Jupiter trojan 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 its orbit (see Trojans in astronomy).[3] It orbits the Sun at a distance of 4.9–5.6 AU once every 11 years and 12 months (4,381 days; semi-major axis of 5.24 AU). Its orbit has an eccentricity of 0.07 and an inclination of 11° with respect to the ecliptic.[2] The body's observation arc begins with its first observation as 1977 UG₅ at the Palomar Observatory in October 1977, almost 20 years prior to its official discovery observation at La Silla.[1]

Naming

This minor planet was named from Greek mythology after the Trojan warrior Aretaon. He was killed by Teucer during the Trojan War.[1] The official naming citation was published by the Minor Planet Center on 6 January 2003 (M.P.C. 47300).[9]

Physical characteristics

Aretaon is an assumed, carbonaceous C-type asteroid.[6] The majority of Jupiter trojans are D-types, with the reminder being mostly C- and P-type asteroids.[6]

Rotation period

In September 2012, a rotational lightcurve of Aretaon was obtained from photometric observations by Robert Stephens at the Center for Solar System Studies in Landers, California. Lightcurve analysis gave a rotation period of 8.05 hours with a brightness amplitude of 0.17 magnitude (U=2).[7] This period determination was confirmed by astronomers at the Palomar Transient Factory in September 2013, measuring a period of 8.048 hours and an amplitude of 0.19 magnitude in the R-band (U=2).[8]

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Aretaon measures 39.151 kilometers in diameter and its surface has an albedo of 0.073,[5] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 42.23 kilometers based on an absolute magnitude of 10.6.[6]

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
• Discovery Circumstances: Numbered Minor Planets (10001)-(15000) – Minor Planet Center
• Asteroid 12052 Aretaon at the Small Bodies Data Ferret
• 12052 Aretaon at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 12052 Aretaon at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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- [en] 12052 Aretaon

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[ru] (12052) Аретаон

(12052) Аретаон (лат. Aretaon) — типичный троянский астероид Юпитера, движущийся в точке Лагранжа L5, в 60° позади планеты. Астероид был открыт 3 мая 1997 года бельгийским астрономом Эриком Эльстом в обсерватории Ла-Силья и назван в честь одного из защитников Трои.

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