(468861) 2013 LU28

Trans-Neptunian object August 2026 yes (468861) 2013 LU 28 #C2E0FF Mount Lemmon Srvy. Mount Lemon Obs. 8 June 2013 (468861) 2013 LU 28 2014 LJ 92015 KB 157 TNOcentaurdamocloiddistant 9 June 2026 (JD 2461200.5) 0 12.82 yr (4,684 d) 348.86 AU 8.748851AU 178.808 AU 0.951071 2433.62 yr 359.24° 0.00041221 ms / day 125.309096° 276.050762° 153.16585° 3.87262 AU -2.065 106 km (est.)114 km (est.) 0.08 (est.)0.09 (est.) Prominent water (H 2 O/"bowl" type)6 8.21 (468861) 2013 LU 28 is a highly eccentric trans-Neptunian object, retrograde centaur and damocloid from the outer regions of the Solar System. It was discovered on 8 June 2013 by astronomers with the Mount Lemmon Survey at the Mount Lemmon Observatory in Arizona, United States. 2013 LU 28 is approximately 110 km mi off 2 us in diameter. It was numbered in 2016 and has not been named since. Discovery and naming Discovery June 2026 thumb|left|Mount Lemmon Survey 2013 LU 28 was discovered on 8 June 2013 by astronomers with the Mount Lemmon Survey at the Mount Lemmon Observatory in Arizona, United States. Naming and numbering This distant minor planet was numbered by the Minor Planet Center on 20 June 2016 (M.P.C. 100585). As of 2025, it has not been named. Orbit and classification 2013 LU 28 orbits the Sun at a distance of 8.7–353.1 AU once every 2434 years (888,879 days; semi-major axis of 180.92 AU). Its orbit has an exceptionally high eccentricity of 0.95 and an inclination of 125° with respect to the ecliptic. The body's observation arc begins with its official discovery observation at Mount Lemmon in June 2013. TNO, centaur and damocloid With a semi-major axis larger than that of Neptune, 2013 LU 28 is generically classified as a trans-Neptunian object. It is also considered an (extended) centaur, due to its eccentric orbit with a low perihelion of 8.7 AU and a higher-than-90°-inclination, which gives it a retrograde orbit. There are only about a hundred known retrograde minor planets out of nearly 800,000 observed bodies, and, together with 342842 2008 YB 3 and 2011 MM 4, it is among the largest such objects. 2013 LU 28 also meets the orbital definition for being a damocloid, a cometary-like object without a coma or tail and a Tisserand's parameter with respect to Jupiter of less than 2 besides a retrograde orbit. Physical characteristics Diameter and albedo According to Johnston's Archive and astronomer Michael Brown, 2013 LU 28 measures 106 and 114 kilometers in diameter, based on an absolute magnitude of 8.1 and an assumed albedo for the body's surface of 0.08 and 0.09, respectively. As of 2018, no physical characteristics have been determined from photometric observations. The body's rotation period, pole and shape remain unknown. Observations On 12 April 2024, the James Webb Space Telescope (JWST) observed 2013 LU 28 using its Mid-Infrared Instrument (MIRI). Published results are expected at a later date.https://jwstfeed.com/Schedule/ShowSchedule?pageNumber=1 JWST Schedule James Webb Space Telescope 17 April 2024 On 30 January 2025, 2013 LU 28's shadow, cast by a magnitude 12 star (TYC 2449-01891-1), swept across the eastern US and central Europe. Out of 31 stations, 7 successfully observed the occultation, from which a 122.2 km x 105.0 km profile was derived. References 30em 2026-04-05 last obs. JPL Small-Body Database Browser: 468861 (2013 LU28) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2468861 Jet Propulsion Laboratory 29 June 2026 468861 (2013 LU28) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=468861 17 October 2018 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 17 October 2018 List of Known Trans-Neptunian Objects Johnston's Archive 7 October 2018 Johnston Wm. Robert http://www.johnstonsarchive.net/astro/tnoslist.html 17 October 2018 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 17 October 2018 List of Centaurs and Scattered-Disk Objects Minor Planet Center https://www.minorplanetcenter.net/iau/lists/t_centaurs.html 17 October 2018 C. de la Fuente Marcos R. de la Fuente Marcos August 2014 Large retrograde Centaurs: visitors from the Oort cloud? Astrophysics and Space Science 352 2 409–419(Ap&SSHomepage) 2014Ap&SS.352..409D 10.1007/s10509-014-1993-9 1406.1450 119255885 468861 17 October 2018 Asteroidal Occultation Reviewed Results for North America International Occultation Timing Association (IOTA) https://www.asteroidoccultation.com/observations/Results/Reviewed/Data2025/20250130_468861_2013%20LU28_Profile-Detail.gif 12 February 2025 etal Noemí Pinilla-Alonso Rosario Brunetto Mário N. De Prá Bryan J. Holler Elsa Hénault Ana Carolina de Souza Feliciano A JWST/DiSCo-TNOs portrait of the primordial Solar System through its trans-Neptunian objects https://hal.science/hal-04961629v1/file/s41550-024-02433-2.pdf Nature Astronomy December 2024 9 2 230–244 10.1038/s41550-024-02433-2 2025NatAs...9..230P 274932942 External links List Of Centaurs and Scattered-Disk Objects, Minor Planet Center Discovery Circumstances: Numbered Minor Planets (465001)-(470000) – Minor Planet Center Asteroid (468861) 2013 LU28, Small Bodies Data Ferret 468861 2468861 468861 (468861) 2013 LU 28 Category:Damocloids Category:Centaurs (small Solar System bodies) Category:Discoveries by MLS 20130608 Category:Minor planets with a retrograde orbit