2015 RX245

Highly eccentric detached trans-Neptunian object October 2018 yes 2015 RX 245 #C2E0FF Planet_nine-etnos_now-new2.png Orbital diagram of 2015 RX 245 and other objects along with hypothetical Planet Nine (first observed only)OSSOS Mauna Kea Obs. 8 September 2015 2015 RX 245 o5t52 TNOEDDOETNOdistant 27 April 2019 (JD 2458600.5) 5 1.61 yr (587 d) 788.22 AU 45.563 AU 416.89 AU 0.8907 8512 yr (3,109,107 d) 358.03° 0.0001 ms / day 12.144° 8.5994° 65.124° 17.5 AU 245 km (est.) How many dwarf planets are there in the outer solar system? California Institute of Technology Brown Michael E. http://web.gps.caltech.edu/~mbrown/dps.html 25 October 2018255 km (est.) 0.08 (assumed)0.09 (assumed) 6.2 2015 RX 245 is a detached trans-Neptunian object on a highly eccentric orbit in the outermost region of the Solar System. It measures approximately 250 km mi off 2 us in diameter. It was first observed on 8 September 2015, by astronomers with Outer Solar System Origins Survey using the 3.6-meter Canada–France–Hawaii Telescope at Mauna Kea Observatories, Hawaii, in the United States. Orbit and classification 200px|thumb|left|2015 RX 245 has a similar size and orbit as 2013 SY 99. 2015 RX 245 belongs to a small group of detached objects with perihelion distances of 30 AU or more, and semi-major axes of 150 AU or more. These extreme trans-Neptunian objects (ETNOs) can not reach such orbits without some perturbing object, which leads to the speculation of Planet Nine. It is also denoted as an extended detached disc object or extreme distant detached object (EDDO). It orbits the Sun at a distance of 45.6–788 AU once every 8512 years (3,109,107 days; semi-major axis of 417 AU). Its orbit has an exceptionally high eccentricity of 0.89 and an inclination of 12° with respect to the ecliptic. The body's observation arc begins with a precovery taken at Mauna Kea on 23 June 2015, or 11 weeks prior to its official first observation. It has a minimum orbital intersection distance with Neptune of 17.5 AU. 2015 RX 245 has a similar size and orbit as 2013 SY 99, as well as close positions to each other at the moment, both about 60 AU from the Sun (see adjunct diagram, in the middle bottom). left Numbering and naming As of 2025, this minor planet has neither been numbered nor named by the Minor Planet Center. The official discoverers will be defined when the object is numbered. Physical characteristics According to American astronomer Michael Brown and to Johnston's Archive, 2015 RX 245 measures 128 and 130 kilometers in diameter based on an assumed albedo of 0.09 and 0.08, respectively. As of 2018, no rotational lightcurve has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown. See also List of unnumbered trans-Neptunian objects 2015 RX245 References 30em 2017-01-30 last obs. JPL Small-Body Database Browser: (2015 RX245) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3775259 Jet Propulsion Laboratory 26 October 2018 2015 RX245 Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=2015+RX245 26 October 2018 MPEC 2017-M25 : 2015 RX245 Minor Planet Center 19 June 2017 https://www.minorplanetcenter.net/mpec/K17/K17M25.html 26 October 2018 List Of Centaurs and Scattered-Disk Objects Minor Planet Center https://www.minorplanetcenter.net/iau/lists/t_centaurs.html 25 October 2018 Database Query: objects q>30, a>150 Minor Planet Center http://minorplanetcenter.net/db_search/show_by_properties?perihelion_distance_min=30&semimajor_axis_min=150 25 October 2018 List of Known Trans-Neptunian Objects Johnston's Archive 7 October 2018 http://www.johnstonsarchive.net/astro/tnoslist.html 25 October 2018 2015 RX245 26 October 2018 etal Shankman Cory OSSOS. VI. Striking Biases in the Detection of Large Semimajor Axis Trans-Neptunian Objects https://pure.qub.ac.uk/portal/en/publications/ossos-vi-striking-biases-in-the-detection-of-large-semimajor-axis-transneptunian-objects(027b7a9c-a171-42b4-9449-9355b0a255d4).html 2017 The Astronomical Journal 154 2 50 10.3847/1538-3881/aa7aed 1706.05348 2017AJ....154...50S 10150/625487 3535702 free External links OSSOS VI. Striking Biases in the detection of large semimajor axis Trans-Neptunian Objects 16 Jun 2017 List Of Centaurs and Scattered-Disk Objects, Minor Planet Center 2015RX245 3775259 # # Category:Minor planet object articles (unnumbered) Category:Discoveries by OSSOS 20150908 Category:Inner Oort cloud