(5119) 1988 RA1
| Discovery [1] | |
|---|---|
| Discovered by | P. Jensen |
| Discovery site | Brorfelde Obs. |
| Discovery date | 8 September 1988 |
| Designations | |
| MPC designation | (5119) 1988 RA1 |
| 1988 RA1 | |
|
Jupiter trojan [2] at L5 · Trojan camp[3] | |
| Orbital characteristics [4] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 61.15 yr (22,335 days) |
| Aphelion | 5.7658 AU |
| Perihelion | 4.6358 AU |
| 5.2008 AU | |
| Eccentricity | 0.1086 |
| 11.86 yr (4,332 days) | |
| 127.67° | |
| Inclination | 15.950° |
| 316.97° | |
| 17.326° | |
| Physical characteristics | |
| Dimensions |
49.25±0.52 km[5] 50.77 km (calculated)[2] |
| 12.807±0.016 h[3] | |
|
0.061±0.008[5] 0.057 (assumed)[2] | |
| C [2] | |
|
10.3[4] 10.2[2][5] 10.63±0.20[6] | |
|
| |
(5119) 1988 RA1 is an unnamed, carbonaceous asteroid, classified as Jupiter trojan, about 50 kilometers in diameter. It was discovered by Danish astronomer Poul Jensen at the Brorfelde Observatory near Holbæk, Denmark, on September 8, 1988.[1]
The dark C-type asteroid resides in the trailing Trojan camp at Jupiter's L5 Lagrangian point, which lies 60° behind its orbit.[3] It orbits the Sun at a distance of 4.6–5.8 AU once every 11 years and 10 months (4,332 days). Its orbit has an eccentricity of 0.11 and an inclination of 16° with respect to the ecliptic.[4]
In February 1994, the Trojan asteroid was observed by astronomers Stefano Mottola and Anders Eriksson 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 12.807±0.016 hours with a brightness variation of 0.31±0.01 magnitude (U=2+).[3]
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the Trojan asteroid measures 49.3 kilometers in diameter and its surface has a low albedo of 0.061.[5] The Collaborative Asteroid Lightcurve Link (CALL) assumes a similar albedo of 0.057 and calculates a diameter of 50.8 kilometers.[2]
References
- 1 2 "5119 (1988 RA1)". Minor Planet Center. Retrieved March 2016.
- 1 2 3 4 5 6 "LCDB Data for (5119)". Asteroid Lightcurve Database (LCDB). Retrieved March 2016.
- 1 2 3 4 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.
- 1 2 3 "JPL Small-Body Database Browser: 5119 (1988 RA1)" (2016-02-15 last obs.). Jet Propulsion Laboratory. Retrieved March 2016.
- 1 2 3 4 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
- ↑ 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.
External links
- Rotational Properties of Jupiter Trojans. I. Light Curves of 80 Objects (PDF)
- 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
- (5119) 1988 RA1 at the JPL Small-Body Database
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