6002_Eetion

6002 Eetion

6002 Eetion

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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.

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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 for Small Bodies 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]

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References

  1. [1]
    "6002 (1988 RO)". Minor Planet Center. Retrieved 22 June 2018.
  2. [2]
    "JPL Small-Body Database Browser: 6002 (1988 RO)" (2018-05-22 last obs.). Jet Propulsion Laboratory. Retrieved 22 June 2018.
  3. [3]
    "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. Retrieved 22 June 2018.
  4. [4]
    "Asteroid (6002) 1988 RO – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 22 June 2018.
  5. [5]
    Grav, T.; Mainzer, A. K.; Bauer, J. M.; Masiero, J. R.; Nugent, C. R. (November 2012). "WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy". The Astrophysical Journal. 759 (1): 10. arXiv:1209.1549. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. S2CID 119101711. (online catalog)
  6. [6]
    Mottola, Stefano; Di Martino, Mario; Erikson, Anders; Gonano-Beurer, Maria; Carbognani, Albino; Carsenty, Uri; et al. (May 2011). "Rotational Properties of Jupiter Trojans. I. Light Curves of 80 Objects". The Astronomical Journal. 141 (5): 32. Bibcode:2011AJ....141..170M. doi:10.1088/0004-6256/141/5/170.
  7. [7]
    "LCDB Data for (6002)". Asteroid Lightcurve Database (LCDB). Retrieved 22 June 2018.
  8. [8]
    "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 22 June 2018.
  9. [9]
    "WGSBN Bulletin Archive". Working Group for Small Bodies Nomenclature. 29 November 2021. Retrieved 29 November 2021. (Bulletin #12)
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