(506479) 2003 HB57

Extreme trans-Neptunian object October 2017 yes (506479) 2003 HB 57 #C2E0FF Mauna Kea Obs. Mauna Kea Obs. 26 April 2003 (506479) 2003 HB 57 TNOE-SDOdistantdetached 4 September 2017 (JD 2458000.5) 4 13.94 yr (5,090 days) 294.21 AU 38.109 AU 166.16 AU 0.7706 2141.87 yr (782,317 days) 1.4255° 0.0005 ms / day 15.473° 197.82° 11.013° 147 km200 km 0.040.09 BR 7.47.6 (506479) 2003 HB 57 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. Description 2003 HB 57 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. 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. Such objects can not have reached their present-day orbits without the gravitational influence of some perturbing object, which leads to the speculation of Planet Nine. Physical characterization 2003 HB 57 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. References 30em 2017-04-02 last obs. JPL Small-Body Database Browser: 506479 (2003 HB57) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2506479 Jet Propulsion Laboratory 9 December 2017 506479 (2003 HB57) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=506479 9 December 2017 List of Known Trans-Neptunian Objects Johnston's Archive 15 October 2017 Johnston, Wm. Robert http://www.johnstonsarchive.net/astro/tnoslist.html 16 November 2017 How many dwarf planets are there in the outer solar system? California Institute of Technology Michael E. Brown http://web.gps.caltech.edu/~mbrown/dps.html 30 July 2017 List Of Centaurs and Scattered-Disk Objects Minor Planet Center http://www.minorplanetcenter.org/iau/lists/Centaurs.html 9 December 2017 minorplanetcenter.net: q>30, a>150 Scott S. Sheppard Chadwick Trujillo December 2016 New Extreme Trans-Neptunian Objects: Toward a Super-Earth in the Outer Solar System The Astronomical Journal 152 6 18 2016AJ....152..221S 10.3847/1538-3881/152/6/221 1608.08772 119187392 free de la Fuente Marcos Carlos de la Fuente Marcos Raúl Finding Planet Nine: apsidal anti-alignment Monte Carlo results Monthly Notices of the Royal Astronomical Society 21 October 2016 462 2 1972–1977 1607.05633 10.1093/mnras/stw1778 free 2016MNRAS.462.1972D 119212828 External links Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) Discovery Circumstances: Numbered Minor Planets (505001)-(510000) – Minor Planet Center 506479 506479 (506479) 2003 HB 57 506479 506479 20030426