(678191) 2017 OF69

Trans-Neptunian object 2017 OF201 2017 OF 201, a distant extreme trans-Neptunian object October 2018 yes (678191) 2017 OF 69 #C2E0FF 2017 OF69 Hubble.png 2017 OF 69 photographed by the Hubble Space Telescope on 9 June 2026 David J. Tholen Scott S. Sheppard Chad Trujillo Maunakea Obs. 26 July 2017 (678191) 2017 OF 69 TNOplutinodistant 27 April 2019 (JD 2458600.5) 3 6.01 yr (2,195 d) 47.844 AU Tm on 31.418 AU Tm on 39.631 AU Tm on 0.2072 249.49 yr (91,128 d) 251.02° 0.0040 ms / day 13.654° 218.53° 215.37° 0 662 km (est.) 0.074 (assumed) 4.34 (678191) 2017 OF 69 is a trans-Neptunian object located in the Kuiper belt, a region of the Solar System beyond the orbit of Neptune. It is a member of the plutinos, a population of Kuiper belt objects in a 2:3 orbital resonance with Neptune, like Pluto. The object measures approximately 662 km mi off 2 us in diameter. It was discovered on 26 July 2017, by American astronomers David Tholen, Scott Sheppard, and Chad Trujillo at Maunakea Observatory in Hawaii, but not announced until 31 May 2018 due to observations made in April and May 2018 refining its orbit significantly. 2017 OF 69 was photographed by the Hubble Space Telescope on 9 June 2026, during a search for moons around large trans-Neptunian objects. Orbit and classification 2017 OF 69 is a large plutino, a subgroup of the resonant trans-Neptunian objects located in the inner region of Kuiper belt. Named after the group's largest member, Pluto, the plutinos have a 2:3 orbital resonance with Neptune. It orbits the Sun at a distance of 31.4–47.8 AU once every 249 years and 6 months (91,128 days; semi-major axis of 39.63 AU). Its orbit has an eccentricity of 0.21 and an inclination of 14° with respect to the ecliptic. The body's observation arc begins with a precovery by Pan-STARRS in June 2012. thumb|center|Orbital diagram of 2017 OF 69 with other large plutinos: Pluto, Orcus, Achlys and Ixion Numbering and naming This minor planet was numbered by the Minor Planet Center on 22 March 2024 (M.P.C. 172722). January 2026, it has not been named. Physical characteristics Diameter and albedo According to Johnston's Archive, 2017 OF 69 measures 662 kilometers in diameter assuming an albedo of 0.074 for the body's surface. This makes 2017 OF 69 a notably large body for how late it has been discovered, being the fifth largest plutino in the Solar System, after Pluto, Orcus, Achlys, and Ixion, and the largest discovered since Orcus in 2004. Rotation period As of 2018, no rotational lightcurve of 2017 OF 69 has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown. See also (84922) 2003 VS 2 – an elongated plutino with a similar size as 2017 OF 69 References 30em 2018-06-14 last obs. JPL Small-Body Database Browser: (2017 OF69) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3825047 Jet Propulsion Laboratory 23 October 2018 MPEC 2018-K109L 2017 OF69 31 May 2018 Minor Planet Center International Astronomical Union https://minorplanetcenter.net/mpec/K18/K18KA9.html 1 June 2018 2017 OF69 Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=2017+OF69 23 October 2018 List of Known Trans-Neptunian Objects Johnston's Archive 7 October 2018 http://www.johnstonsarchive.net/astro/tnoslist.html 23 October 2018 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 22 April 2024 A Search For The Moons of Mid-Sized TNOs https://www.stsci.edu/hst-program-info/download/hst/pdf/18010/ Benjamin Proudfoot Mikulski Archive for Space Telescopes Space Telescope Science Institute August 2025 HST Proposal 18010 Cycle 33 2025-08-17 External links List of Transneptunian Objects, Minor Planet Center 2017OF69 20678191 678191 (678191) 2017 OF 69 Category:Plutinos Category:Discoveries by David J. Tholen Category:Discoveries by Chad Trujillo Category:Discoveries by Scott S. Sheppard 20170726