(574372) 2010 JO179

Large trans-Neptunian object August 2021 yes (574372) 2010 JO 179 possible dwarf planet Pan-STARRS 1 Haleakala Obs. 10 May 2010 (574372) 2010 JO 179 TNOSDO5:21 res.p-DPdistant 31 May 2020 (JD 2459000.5) 2 69.54 yr (25,399 days) 4 February 1951 (POSS-I) 117.997 AU 39.590 AU 1951-Sep-13 78.793 AU 0.49755 699.43 yr (255,466 d) 35.211° 0.0014 ms / day 32.025° 147.350° 10.427° 0 600 - 900 km (implied by estimated albedo)647 km? 30.6 h30.6324 h (best fit) 0.07 ~ 0.21 (estimated)0.124 (assumed) g-r 0.88 0.21r-i 0.34 0.26r-z 0.13 0.22 3.44 0.10 (R-band)3.83 (574372) 2010 JO 179 is a large, high-order resonant trans-Neptunian object in the outermost regions of the Solar System, probably somewhere between 600 and 900 km mi off 2 us in diameter. Long-term observations suggest that the object is in a meta-stable 5:21 resonance with Neptune. Other sources classify it as a scattered disc object. It is possibly large enough to be a dwarf planet. 2010 JO 179 has not yet been imaged by high-resolution telescopes, so it has no known moons. The Hubble Space Telescope is planned to image 2010 JO 179 in 2026, which should determine if it has significantly sized moons. First observation and orbit thumb|left|The libration of 2010 JO 179's nominal orbit, in a frame co-rotating with Neptune (click image to view animation) The Minor Planet Center credits the object's first official observation on 10 May 2010 to Pan-STARRS F51 at Haleakala Observatory, Hawaii, United States. The observations were made by Pan-STARRS Outer Solar System Survey. There are 4 February 1951 precovery images from the Palomar Observatory Sky Survey, extending the observation arc by approximately 60 years. The precovery images are from the same year the object came to perihelion (closest approach to the Sun). 2010 JO 179 orbits the Sun at a distance of 39.6–118 AU once every 699 years and 5 months (semi-major axis of 78.8 AU). Its orbit has a high eccentricity of 0.50 and an inclination of 32° with respect to the ecliptic. Numbering and naming This minor planet was numbered by the Minor Planet Center on 10 August 2021, receiving the number 574372 574372 in the minor planet catalog M.P.C. 133504. 2026 10, it has not been named. Physical characteristics Photometry Photometric observations of 2010 JO 179 gave a monomodal lightcurve with a slow rotation period of 30.6 hours, suggesting a rather spherical shape with significant albedo patchiness. An alternative period solution of a bimodal lightcurve is considered less likely. It would double the period and imply an ellipsoidal shape with an axis-ratio of at least 1.58. Surface and spectra 2010 JO 179 has color indices of g-r of 0.88 0.21, r-i of 0.34 0.26 and r-z of 0.13 0.22, making it have a moderately red surface. Diameter and albedo The object's mean diameter has been estimated to measure 600 to 900 km mi, based on an assumed albedo of 0.21 to 0.07. Johnston's archive estimates a diameter of 647 km mi, assuming an albedo of 0.124. References 30em 2020-08-19 last obs. JPL Small-Body Database Browser: (2010 JO179) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3781468 Jet Propulsion Laboratory 28 August 2020 2010 JO179 Minor Planet Center http://www.minorplanetcenter.net/db_search/show_object?object_id=2010+JO179 27 August 2020 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 21 August 2021 MPEC 2017-S54 : 2010 JO179 Minor Planet Center 18 September 2017 https://minorplanetcenter.net/mpec/K17/K17S54.html 21 February 2018 etal Matthew J. Holman Matthew J. Payne Wesley Fraser Pedro Lacerda Michele T. Bannister Michael Lackner A dwarf planet class object in the 21:5 resonance with Neptune The Astrophysical Journal 2018 855 1 L6 10.3847/2041-8213/aaadb3 1709.05427 2018ApJ...855L...6H 55279330 free List of Known Trans-Neptunian Objects Johnston's Archive 19 January 2026 Johnston, Wm. Robert http://www.johnstonsarchive.net/astro/tnoslist.html 19 February 2026 List Of Centaurs and Scattered-Disk Objects Minor Planet Center http://www.minorplanetcenter.org/iau/lists/Centaurs.html 15 December 2017 Horizons Batch for 574372 (2010 JO179) on 1951-Sep-13 JPL Horizons Perihelion occurs when rdot flips from negative to positive https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%272010+JO179%27&START_TIME=%271951-Sep-01%27&STOP_TIME=%271951-Sep-30%27&STEP_SIZE=%273%20hours%27&QUANTITIES=%2719%27 2021-09-21 (JPL#8/Soln.date: 2021-Aug-26) 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 MPEC, 18 September 2017 1951 precovery images 2010JO179 3781468 574372 (574372) 2010 JO 179 574372 Category:Trans-Neptunian objects in a 5:21 resonance 574372 574372 20100517