(506479) 2003 HB57

(506479) 2003 HB57, is an extreme trans-Neptunian object of the extended scattered disc in the outermost region of the Solar System, approximately 180 kilometers in diameter. It was discovered by astronomers at the Mauna Kea Observatory on 26 April 2003.[4]

(506479) 2003 HB57
Discovery[1]
Discovered byMauna Kea Obs.
Discovery siteMauna Kea Obs.
Discovery date26 April 2003
Designations
(506479) 2003 HB57
2003 HB57
TNO[1] · E-SDO[2][3]
distant[4] · detached
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 4
Observation arc13.94 yr (5,090 days)
Aphelion294.21 AU
Perihelion38.109 AU
166.16 AU
Eccentricity0.7706
2141.87 yr (782,317 days)
1.4255°
0° 0m 1.8s / day
Inclination15.473°
197.82°
11.013°
Physical characteristics
Mean diameter
147 km[2]
200 km[5]
0.04[5]
0.09[2]
BR[2]
7.4[1] · 7.6[5]

    Description

    2003 HB57 orbits the Sun at a distance of 38.1–294.2 AU once every 2141 years and 10 months (782,317 days). Its orbit has an eccentricity of 0.77 and an inclination of 15° with respect to the ecliptic.[1]

    Extended scattered disc

    It is one of a small group of extreme trans-Neptunian objects with perihelion distances of 30 AU or more, and semi-major axes of 150 AU or more.[6] Such objects can not have reached their present-day orbits without the gravitational influence of some perturbing object, which lead to the speculation of planet nine.[7][8]

    Physical characterization

    2003 HB57 has a BR-type spectrum and an estimated diameter of 147 and 200 kilometers based on an assumed albedo of 0.09 and 0.04, respectively.[2][5]

    References
    1. "JPL Small-Body Database Browser: 506479 (2003 HB57)" (2017-04-02 last obs.). Jet Propulsion Laboratory. Retrieved 9 December 2017.
    2. Johnston, Wm. Robert (15 October 2017). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 16 November 2017.
    3. "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. Retrieved 9 December 2017.
    4. "506479 (2003 HB57)". Minor Planet Center. Retrieved 9 December 2017.
    5. Michael E. Brown. "How many dwarf planets are there in the outer solar system?". California Institute of Technology. Retrieved 30 July 2017.
    6. minorplanetcenter.net: q>30, a>150
    7. Sheppard, Scott S.; Trujillo, Chadwick (December 2016). "New Extreme Trans-Neptunian Objects: Toward a Super-Earth in the Outer Solar System". The Astronomical Journal. 152 (6): 18. arXiv:1608.08772. Bibcode:2016AJ....152..221S. doi:10.3847/1538-3881/152/6/221. S2CID 119187392.
    8. de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl (21 October 2016). "Finding Planet Nine: apsidal anti-alignment Monte Carlo results". Monthly Notices of the Royal Astronomical Society. 462 (2): 1972–1977. arXiv:1607.05633. Bibcode:2016MNRAS.462.1972D. doi:10.1093/mnras/stw1778. S2CID 119212828.

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