1994 WR12

Near-Earth asteroid February 2018 yes 1994 WR 12 #FFC2E0 C. S. Shoemaker Palomar Obs. 28 November 1994 1994 WR 12 NEOAten 2025-Nov-21 (JD 2461000.5) 0 31.06 yr (11,345 d) 1.0576 AU e6km unit on 0.4560 AU e6km unit 0.7568 AU e6km unit 0.39748 240.5 days (0.658 yr) 152.77° 1.4971 ms / day 6.8465° 62.521° 206.04° 0.0015 AU LD on 130 m (est.)92 – 210 m (CNEOS) 2.9 9 kg (est.) 22.4 1994 WR 12 is an asteroid and near-Earth object approximately 130 m ft off 2 us in diameter. As a member of the Aten group almost all of its orbit is closer to the Sun than Earth is. On 24 November 1994 it passed about 374100 km from the Moon. First imaged at Kitami Observatory on 26 November 1994, it was discovered two nights later by American astronomer Carolyn S. Shoemaker at Palomar Observatory on 28 November 1994. The asteroid then went unobserved from 1994 until it was recovered by Mauna Kea in March 2016. It was removed from the Sentry Risk Table on 2 April 2016. +Close approaches Date JPL SBDBnominal geocentricdistance uncertaintyregion(3-sigma)2021-11-29 6152189 km ± 34 km2046-11-25 1633719 km ± 4133 km2190-11-23 135000000 km ± 815 million km Description 1994 WR 12 orbits the Sun at a distance of 0.5–1.1 AU once every 8 months (240 days). Its orbit has an eccentricity of 0.40 and an inclination of 7° with respect to the ecliptic. It has an Earth minimum orbital intersection distance of 0.0018 AU km on 3, which translates into 0.7 lunar distances. On 25 November 2046, it will pass 1633719 km from Earth with an uncertainty of ±4133 km. While listed on the Sentry Risk Table the range for the 2046 close approach distance varied from 0.001 AU km on to 0.039 AU km on from Earth. While listed on the Sentry Risk Table, virtual clones of the asteroid that fit the uncertainty in the known trajectory showed 116 potential impacts between 2054 and 2109. It had about a cumulative 1 in 9090 chance of impacting the Earth. The formerly poorly known trajectory of this asteroid was further complicated by close approaches to Venus and Mercury. It was recovered by Mauna Kea in March 2016, which extended the observation arc from 34 days to 21 years. It is estimated that an impact would produce the equivalent of 77 megatons of TNT, roughly 1.5 times that of most powerful nuclear weapon ever detonated (Tsar Bomba). It has a unique characteristic: it is coplanar with Mercury, it can be a fragment thrown away by an asteroid impact on Mercury, its very little MOID with the Earth can produce a meteor shower on Earth and if the meteoroids were large enough even Mercurian meteorites.June 2026 See also Lost asteroids References 2022-01-25 last obs. JPL Small-Body Database Browser: (1994 WR12) https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=3005969&view=OPC Jet Propulsion Laboratory https://web.archive.org/web/20171130073410/http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=1994WR12;cad=1 2017-11-30 live 29 November 2021 1994 WR12 Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1994+WR12 30 June 2020 MPEC 1994-Y05 : 1994 WR12 IAU Minor Planet Center 1994-12-21 http://www.minorplanetcenter.net/mpec/J94/J94Y05.html 2011-10-17 (J94W12R) Archive: Sentry Risk Table NASA/JPL Near-Earth Object Program Office http://neo.jpl.nasa.gov/risk/ 2013-05-29 dead https://web.archive.org/web/20130529175100/http://neo.jpl.nasa.gov/risk/ 2013-05-29 Archive: Earth Impact Risk Summary: 1994 WR12 NASA/JPL Near-Earth Object Program Office http://neo.jpl.nasa.gov/risk/1994wr12.html 26 March 2016 dead https://web.archive.org/web/20160326083250/http://neo.jpl.nasa.gov/risk/1994wr12.html 26 March 2016 Removed Objects NASA/JPL Near-Earth Object Program Office https://cneos.jpl.nasa.gov/sentry/removed.html JPL Close-Approach Data: (1994 WR12) https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=1994WR12&view=OPC 2021-11-29 http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=1994WR12;cad=1%23cad (1994 WR12) 2018-01-29 https://archive.today/20121213114447/http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=1994WR12;cad=1%23cad 2012-12-13 (last observation: 1994-12-31; arc: 35 days; Uncertainty: 8) Horizons Batch for 2021-Nov-29 06:05 UT JPL Horizons https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%271994+WR12%27&START_TIME=%272021-Nov-29%2006:05%27&STOP_TIME=%272021-Nov-30%27&STEP_SIZE=%271+day%27&QUANTITIES=%2720,39%27 https://web.archive.org/web/20211119145557/https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%271994+WR12%27&START_TIME=%272021-Nov-29+06%3A03%27&STOP_TIME=%272021-Nov-30%27&STEP_SIZE=%271+day%27&QUANTITIES=%2720%2C39%27 2021-11-19 live 2021-11-28 Horizons Batch for 2190-Nov-23 22:27 UT JPL Horizons https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%271994+WR12%27&START_TIME=%272190-Nov-23%2022:27%27&STOP_TIME=%272190-Nov-24%27&STEP_SIZE=%271+day%27&QUANTITIES=%2720,39%27 https://web.archive.org/web/20211120140319/https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%271994+WR12%27&START_TIME=%272190-Nov-24+06%3A35%27&STOP_TIME=%272190-Nov-25%27&STEP_SIZE=%271+day%27&QUANTITIES=%2720%2C39%27 2021-11-20 live 2021-11-29 External links List Of Aten Minor Planets (by designation), Minor Planet Center 1994+WR12 1994WR12 # Category:Minor planet object articles (unnumbered) Category:Discoveries by Carolyn S. Shoemaker # 2021129 19941128