(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] (Trojan camp)[3] | |
| Orbital characteristics [4] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 61.32 yr (22,397 days) |
| Aphelion | 5.7649 AU |
| Perihelion | 4.6374 AU |
| 5.2011 AU | |
| Eccentricity | 0.1084 |
| 11.86 yr (4,333 days) | |
| 144.42° | |
| 0° 4m 59.16s / day | |
| Inclination | 15.950° |
| 316.98° | |
| 17.233° | |
| Jupiter MOID | 0.4011 AU |
| Jupiter Tisserand parameter | 2.9120 |
| Physical characteristics | |
| Dimensions |
49.25±0.52 km[5] 50.77 km (calculated)[2] |
| 12.807±0.016 h[6] | |
|
0.057 (assumed)[2] 0.061±0.008[5] | |
| C [2] | |
|
10.2[2][5] 10.3[4] 10.63±0.20[7] | |
|
| |
(5119) 1988 RA1 is a carbonaceous Jupiter trojan from the Trojan camp, approximately 50 kilometers in diameter. It was discovered on 8 September 1988, by Danish astronomer Poul Jensen at the Brorfelde Observatory near Holbæk, Denmark.[1]
The dark C-type Jovian asteroid resides in Jupiter's L5 Lagrangian point (Trojan camp), which lies 60° behind the gas giant's orbit.[6] It orbits the Sun at a distance of 4.6–5.8 AU once every 11 years and 10 months (4,333 days). The Jovian trojan's orbit has an eccentricity of 0.11 and an inclination of 16° with respect to the ecliptic.[4] The first precovery was taken at Palomar Observatory in 1954, extending the asteroid's observation arc by 34 years prior to its discovery.[1]
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+).[6]
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 assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 50.8 kilometers, based on an absolute magnitude of 10.2.[2]
On the night this minor planet was discovered at Brorfelde Observatory, Poul Jensen also discovered the Jupiter trojan (6002) 1988 RO,[8] the 12-kilometer size main-belt asteroid (9840) 1988 RQ2,[9] 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
- 1 2 3 "5119 (1988 RA1)". Minor Planet Center. Retrieved 1 March 2016.
- 1 2 3 4 5 6 "LCDB Data for (5119)". Asteroid Lightcurve Database (LCDB). Retrieved 24 May 2016.
- ↑ "List of Jupiter Trojans". Minor Planet Center. 20 June 2016. Retrieved 20 June 2016.
- 1 2 3 "JPL Small-Body Database Browser: 5119 (1988 RA1)" (2016-04-17 last obs.). Jet Propulsion Laboratory. Retrieved 24 May 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. Retrieved 24 May 2016. - 1 2 3 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 24 May 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 24 May 2016.
- ↑ "6002 (1988 RO)". Minor Planet Center. Retrieved 31 August 2016.
- ↑ "JPL Small-Body Database Browser: 9840 (1988 RQ2)". Jet Propulsion Laboratory. Retrieved 31 August 2016.
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
