(5119) 1988 RA1

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(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[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 62.27 yr (22,743 days)
Aphelion 5.7640 AU
Perihelion 4.6386 AU
5.2013 AU
Eccentricity 0.1082
11.86 yr (4,333 days)
177.99°
0° 4m 59.16s / day
Inclination 15.949°
316.98°
16.972°
Jupiter MOID 0.3989 AU
Jupiter Tisserand parameter 2.9120
Physical characteristics
Dimensions 49.251±0.518[4][5]
50.77 km (calculated)[2]
12.807±0.016 h[6]
0.057 (assumed)[2]
0.061±0.008[4][5]
C[2]
10.2[2][4] · 10.3[1] · 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.[8]

Discovery[edit]

On the night this minor planet was discovered at Brorfelde Observatory, Poul Jensen also discovered the Jupiter trojan (6002) 1988 RO,[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.

A first precovery was taken at Palomar Observatory in 1954, extending the asteroid's observation arc by 34 years prior to its discovery.[8]

Orbit and classification[edit]

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.[1]

Physical characteristics[edit]

Lightcurve[edit]

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 lightcurve showing a rotation period of 12.807±0.016 hours with a brightness variation of 0.31±0.01 magnitude (U=2+).[6]

Diameter and albedo[edit]

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.[4][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]

Naming[edit]

As of 2017, (5119) 1988 RA1 has not been named by the Minor Planet Center.[8]

References[edit]

  1. ^ a b c d "JPL Small-Body Database Browser: 5119 (1988 RA1)" (2016-04-17 last obs.). Jet Propulsion Laboratory. Retrieved 14 December 2016. 
  2. ^ a b c d e f "LCDB Data for (5119)". Asteroid Lightcurve Database (LCDB). Retrieved 24 May 2016. 
  3. ^ "List of Jupiter Trojans". Minor Planet Center. 20 June 2016. Retrieved 20 June 2016. 
  4. ^ 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". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 24 May 2016. 
  5. ^ 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. arXiv:1209.1549Freely accessible. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. Retrieved 14 December 2016. 
  6. ^ 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 24 May 2016. 
  7. ^ 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:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 24 May 2016. 
  8. ^ a b c "5119 (1988 RA1)". Minor Planet Center. Retrieved 1 March 2016. 
  9. ^ "6002 (1988 RO)". Minor Planet Center. Retrieved 31 August 2016. 
  10. ^ "JPL Small-Body Database Browser: 9840 (1988 RQ2)". Jet Propulsion Laboratory. Retrieved 31 August 2016. 

External links[edit]