astro.wikisort.org - Asteroid

6002 Eetion, provisional designation: 1988 RO, is a mid-sized Jupiter trojan from the Trojan camp, approximately 40 kilometers (25 miles) in diameter. It was discovered by Poul Jensen at the Brorfelde Observatory in 1988, and has not been named since its numbering in June 1994.[8] The dark Jovian asteroid has a rotation period of 12.9 hours.[7] In 2021, it was named from Greek mythology after King Eetion, who was killed by Achilles during the raid on Thebe.

6002 Eetion

Discovery[1]
Discovered by	P. Jensen
Discovery site	Brorfelde Obs.
Discovery date	8 September 1988
Designations
MPC designation	(6002) Eetion
Named after	Eetion (Greek mythology)[1]
Alternative designations	1988 RO
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	64.68 yr (23,624 d)
Aphelion	5.7007 AU
Perihelion	4.7464 AU
Semi-major axis	5.2235 AU
Eccentricity	0.0914
Orbital period (sidereal)	11.94 yr (4,361 d)
Mean anomaly	163.01°
Mean motion	0° 4m 57.36s / day
Inclination	15.556°
Longitude of ascending node	209.71°
Argument of perihelion	159.55°
Jupiter MOID	0.1867 AU
TJupiter	2.9190
Physical characteristics
Mean diameter	40.41±0.47 km[5]
Synodic rotation period	12.918±0.022 h[6]
Geometric albedo	0.075±0.009[5]
Spectral type	C (assumed)[7]
Absolute magnitude (H)	10.4[5] 10.5[1][2] 10.6[7]

Discovery

Eetion discovered on 8 September 1988, by Danish astronomer Poul Jensen at the Brorfelde Observatory near Holbæk, Denmark,[1] who on very same night also discovered the Jupiter trojan (5119) 1988 RA1, and several other main-belt asteroids including (9840) 1988 RQ₂, (12689) 1988 RO₂, (14364) 1988 RM2, (14837) 1988 RN₂, and (24664) 1988 RB₁.

Orbit and classification

Eetion 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 its orbit (see Trojans in astronomy).[3] It is also a non-family asteroid of the Jovian background population.[4]

It orbits the Sun at a distance of 4.7–5.7 AU once every 11 years and 11 months (4,361 days; semi-major axis of 5.22 AU). Its orbit has an eccentricity of 0.09 and an inclination of 16° with respect to the ecliptic.[2] A first precovery was taken at Palomar Observatory in September 1953, extending the body's observation arc by 35 years prior to its official discovery observation at Brorfelde.[1]

Numbering and naming

This minor planet was numbered by the Minor Planet Center on 23 June 1994 (M.P.C. 23661).[8] On 29 November 2021, IAU's Working Group Small Body Nomenclature named it from Greek mythology after King Eetion of Thebe Hypoplakia, father of Andromache, and father-in-law of Hector. Eetion was killed during the raid on Thebe by Achilles.[1][9]

Physical characteristics

This Jupiter trojan is an assumed, carbonaceous C-type asteroid.[7]

Rotation period

In February 1993, Eetion was observed by astronomers Stefano Mottola and Mario Di Martino with the ESO 1-metre telescope and its DLR MkII CCD-camera at La Silla in Chile. The photometric observations were used to build a lightcurve showing a rotation period of 12.918±0.022 hours with a brightness variation of 0.18±0.01 magnitude (U=3-).[6] It was the body's first determined rotation period in literature.[6]^: 29

Diameter and albedo

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Eetion measures 40.4 kilometers in diameter and its surface has an albedo of 0.075,[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.[7]

References

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
• Asteroid (6002) 1988 RO at the Small Bodies Data Ferret
• 6002 Eetion at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 6002 Eetion at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (6002) Eetion

(6002) Eetion 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. (6002) Eetion wurde am 8. September 1988 von Poul Jensen am Observatorium Brorfelde (IAU-Code 054) entdeckt. Er ist dem Lagrangepunkt L5 zugeordnet.

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- [en] 6002 Eetion

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