(792156) 2020 XR

Apollo near-Earth asteroid December 2020 yes #FFC2E0 (792156) 2020 XR 2020xr.dec04.p05us.p4hz.orbital.motion.labelled.v2.jpg Goldstone Observatory radar images of 2020 XR and its satellite Pan-STARRS 2 Haleakala Obs. 4 December 2020 (792156) 2020 XR NEO–Apollo  PHA  2020-May-31 (JD 2459000.5) 0 7.8 years 0.00085 AU km LD on 1.4 AU km on 4.0272 AU km on on (Q) 0.97013 AU km on (q) 8 December 2020 2.4987 AU km on (a) 0.61174 (e) 13.947° (i) 3.95 yr 249.74° (Ω) 312.19° (M) 163.01° (ω) 1 ~390 m ft 1 off us 19.8 __NOTOC__ (792156) 2020 XR is a binary Apollo near-Earth object and potentially hazardous asteroid roughly 390 m ft 1 off us in diameter. With a 5-day observation arc it was briefly listed as having a 1 in 11,000 chance of impacting Earth on 1 December 2028, which placed it at the top of the Sentry Risk Table with a Palermo scale rating of −0.70. Discovery 2020 XR was discovered by Pan-STARRS 2 on 4 December 2020, when it was 0.426 AU e6km unit on from Earth and had a solar elongation of 75°. It came to perihelion on 8 December 2020. On 2 January 2021, it passed 0.328 AU e6km unit from Earth. On 13 December 2020, precovery observations from 2013, 2016, and mid-2020 extended the observation arc from 8 days to 7.8 years allowing the asteroid to be removed from the Sentry Risk Table. Permanent number was assigned on 31 March 2025. Satellite A satellite was discovered on 2 December 2024 by Goldstone Observatory in California using radar observations. 2024 It was the Earth's perturbations of the asteroid in 2024 that determined if an impact was possible in December 2028. On 4 December 2024, the asteroid passed 0.0147 AU e6km LD unit from Earth with an uncertainty region of about ±800 km. This increased the asteroid's orbital period by 10 days. +Orbital period 3 months before and after 2024-Dec-04 Earth approach Parameter Epoch(date) OrbitalPeriod Units (days) Pre-flyby 2024-Sep-04 1441 Post-flyby 2025-Mar-04 1451 2028 On 7 November 2028, the asteroid will pass 0.121 AU e6km unit from Earth. By 1 December 2028 the asteroid will be 0.19 AU e6km unit from Earth with an uncertainty region of about ±10,000 km.short-arc Notes short-arc While the observation arc was only a few days, the uncertainty region on 1 December 2028 was approximately a billion km. References MPEC 2020-X365 : 2020 XR IAU Minor Planet Center 2020-12-07 https://minorplanetcenter.net/mpec/K20/K20X36.html 2020-12-13 (K20X00R) Earth Impact Risk Summary: 2020 XR NASA/JPL Near-Earth Object Program Office https://cneos.jpl.nasa.gov/sentry/details.html#?des=2020%20XR https://web.archive.org/web/20201210071109/https://cneos.jpl.nasa.gov/sentry/ 2020-12-10 dead 2020-12-13 hohmanntransfer: 2020 XR (10 Dec 2020) (1/11000 = 9E-05) last observation: 2020-12-12; arc: 7.8 years JPL Small-Body Database Browser: (2020 XR) http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2020XR&cad=1 Jet Propulsion Laboratory https://web.archive.org/web/20201213155450/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2020XR&cad=1 2020-12-13 live 2020-11-13 2020 XR Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=2020+XR 13 December 2020 (792156) 2020 XR Wm. Robert Johnston https://www.johnstonsarchive.net/astro/astmoons/am-792156.html 13 April 2025 2020XR Ephemerides for 1 December 2028 NEODyS (Near Earth Objects Dynamic Site) https://newton.spacedys.com/neodys/index.php?pc=1.1.3.1&n=2020XR&oc=500&y0=2028&m0=12&d0=1&h0=0&mi0=0&y1=2028&m1=12&d1=2&h1=0&mi1=0&ti=1.0&tiu=days https://web.archive.org/web/20201212155855/https://newton.spacedys.com/neodys/index.php?pc=1.1.3.1&n=2020XR&oc=500&y0=2028&m0=12&d0=1&h0=0&mi0=0&y1=2028&m1=12&d1=2&h1=0&mi1=0&ti=1.0&tiu=days 2020-12-12 live 2020-12-13 External links Asteroid Hazards, Part 3: Finding the Path – YouTube video by the Minor Planet Center (26 August 2015) 2020+XR 2020XR 2020 XR at Virtual Telescope Project 54097969 792156 Category:Apollo asteroids Category:Discoveries by Pan-STARRS Category:Potentially hazardous asteroids Category:Near-Earth objects removed from the Sentry Risk Table 20210102 20201204 Category:Binary asteroids Category:Minor planet object articles (numbered)