(5119) 1988 RA1

(5119) 1988 RA1, provisional designation 1988 RA1, is a Jupiter trojan from the Trojan camp, approximately 49 kilometers (30 mi) in diameter. It was discovered on 8 September 1988 by Danish astronomer Poul Jensen at the Brorfelde Observatory near Holbæk, Denmark.[1] The dark Jovian asteroid has a rotation period of 12.8 hours.[8] It has not been named since its numbering in March 1992.[10]

(5119) 1988 RA1
Discovery [1]
Discovered byP. Jensen
Discovery siteBrorfelde Obs.
Discovery date8 September 1988
Designations
(5119) 1988 RA1
1988 RA1
Jupiter trojan [1][2]
Trojan [3] · background [4]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc63.33 yr (23,130 d)
Aphelion5.7641 AU
Perihelion4.6383 AU
5.2012 AU
Eccentricity0.1082
11.86 yr (4,333 d)
194.78°
0° 4m 59.16s / day
Inclination15.950°
316.98°
16.833°
Jupiter MOID0.398 AU
TJupiter2.9120
Physical characteristics
Dimensions40 km × 40 km[5]
Mean diameter
49.25±0.52 km[6]
12.807±0.016 h[7]
0.061±0.008[6]
C (assumed)[8]
B–V = 0.680±0.060[9]
V–R = 0.440±0.040[9]
V–I = 0.970±0.032[8]
10.2[6]
10.3[1][2][8]

    Discovery

    On the night this minor planet was discovered at Brorfelde Observatory, Poul Jensen also discovered the Jupiter trojan (6002) 1988 RO,[11] the 12-kilometer size main-belt asteroid (9840) 1988 RQ2,[12] 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 December 1954, extending the asteroid's observation arc by 34 years prior to its discovery.[1]

    Orbit and classification

    1988 RA1 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). It is also a non-family asteroid of the Jovian background population.[4] It orbits the Sun at a distance of 4.6–5.8 AU once every 11 years and 10 months (4,333 days; semi-major axis of 5.2 AU). Its orbit has an eccentricity of 0.11 and an inclination of 16° with respect to the ecliptic.[2]

    Physical characteristics

    1988 RA1 is an assumed, carbonaceous C-type asteroid, while most larger Jupiter trojans are D-types. It has a typical V–I color index of 0.97.[8]

    Lightcurve

    In February 1994, 1988 RA1 was observed by Stefano Mottola and Anders Erikson at La Silla Observatory in Chile, using the ESO 1-metre telescope and its DLR MkII CCD-camera. 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+).[7]

    Diameter and albedo

    According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the Trojan asteroid measures 49.25 kilometers in diameter and its surface has a low albedo of 0.061,[6] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroid of 0.057 and calculates a diameter of 48.48 kilometers based on an absolute magnitude of 10.3.[8]

    Numbering and naming

    This minor planet was numbered on 18 March 1992 (M.P.C. 19840).[10] As of 2018, it has not been named.[1]

    References
    1. "5119 (1988 RA1)". Minor Planet Center. Retrieved 21 June 2018.
    2. "JPL Small-Body Database Browser: 5119 (1988 RA1)" (2018-04-20 last obs.). Jet Propulsion Laboratory. Retrieved 21 June 2018.
    3. "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. Retrieved 21 June 2018.
    4. "Asteroid (5119) 1988 RA1 – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 21 June 2018.
    5. "Asteroid (5119) 1988 RA1". Small Bodies Data Ferret. Retrieved 21 June 2018.
    6. 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. (online catalog)
    7. 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.
    8. "LCDB Data for (5119)". Asteroid Lightcurve Database (LCDB). Retrieved 21 June 2018.
    9. Chatelain, Joseph P.; Henry, Todd J.; French, Linda M.; Winters, Jennifer G.; Trilling, David E. (June 2016). "Photometric colors of the brightest members of the Jupiter L5 Trojan cloud". Icarus. 271: 158–169. Bibcode:2016Icar..271..158C. doi:10.1016/j.icarus.2016.01.026.
    10. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 21 June 2018.
    11. "6002 (1988 RO)". Minor Planet Center. Retrieved 31 August 2016.
    12. "JPL Small-Body Database Browser: 9840 (1988 RQ2)". Jet Propulsion Laboratory. Retrieved 31 August 2016.

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