6002 Eetion
| Discovery [1] | |
|---|---|
| Discovered by | P. Jensen |
| Discovery site | Brorfelde Obs. |
| Discovery date | 8 September 1988 |
| Designations | |
| (6002) 1988 RO | |
| 1988 RO | |
| Jupiter trojan [2] (Trojan camp)[3] | |
| Orbital characteristics [1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 62.62 yr (22,871 days) |
| Aphelion | 5.7032 AU |
| Perihelion | 4.7376 AU |
| 5.2204 AU | |
| Eccentricity | 0.0925 |
| 11.93 yr (4,357 days) | |
| 113.13° | |
| 0° 4m 57.36s / day | |
| Inclination | 15.555° |
| 209.72° | |
| 159.74° | |
| Jupiter MOID | 0.1944 AU |
| TJupiter | 2.9180 |
| Physical characteristics | |
| Dimensions | 40.408±0.466 km[1][4] 40.41±0.47 km[2][5] 42.23 km (calculated)[2] |
| 12.918±0.022 h[6] | |
| 0.057 (assumed)[2] 0.075[2][5] 0.075±0.009[1][4] | |
| C [2] | |
| 10.4[5] 10.52±0.34[7] 10.6[1][2] | |
(6002) 1988 RO is a carbonaceous Jupiter trojan from the Trojan camp, approximately 41 kilometers in diameter. It was discovered on 8 September 1988, by Danish astronomer Poul Jensen at the Brorfelde Observatory near Holbæk, Denmark.[8]
The dark C-type Jovian asteroid resides in Jupiter's L5 Lagrangian point (Trojan camp), which lies 60° behind the gas giant's orbit.[3] It orbits the Sun at a distance of 4.7–5.7 AU once every 11 years and 11 months (4,357 days). Its orbit has an eccentricity of 0.09 and an inclination of 16° with respect to the ecliptic.[1] The first precovery was taken at Palomar Observatory in 1953, extending the body's observation arc by 35 years prior to its discovery.[8]
In February 1993, the Trojan asteroid 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 light-curve 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 ever determined rotation period in literature.[6]: 29
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the Trojan asteroid measures 40.4 kilometers in diameter and its surface has an albedo of 0.075.[5][4] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 42.2 kilometers, based on an absolute magnitude of 10.6.[2]
On the night this minor planet was discovered at Brorfelde Observatory, Poul Jensen also discovered the Jupiter trojan (5119) 1988 RA1,[9] the 12-kilometer size main-belt asteroid (9840) 1988 RQ2,[10] as well as (12689) 1988 RO2, (14364) 1988 RM2, (14837) 1988 RN2, and (24664) 1988 RB1, all main-belt asteroids of inner, middle and outer region of the asteroid belt, respectively.
References
- ^ a b c d e f "JPL Small-Body Database Browser: 6002 (1988 RO)" (2016-04-29 last obs.). Jet Propulsion Laboratory. Retrieved 31 August 2016.
- ^ a b c d e f g h "LCDB Data for (6002)". Asteroid Lightcurve Database (LCDB). Retrieved 31 August 2016.
- ^ a b "List of Jupiter Trojans". Minor Planet Center. 20 June 2016. Retrieved 31 August 2016.
- ^ a b c 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. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. Retrieved 31 August 2016.
- ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 31 August 2016.
- ^ a b c 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. Retrieved 31 August 2016.
- ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 31 August 2016.
- ^ a b "6002 (1988 RO)". Minor Planet Center. Retrieved 31 August 2016.
- ^ "5119 (1988 RA1)". Minor Planet Center. Retrieved 1 March 2016.
- ^ "JPL Small-Body Database Browser: 9840 (1988 RQ2)". Jet Propulsion Laboratory. Retrieved 31 August 2016.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- 6002 Eetion at the JPL Small-Body Database
