2014 AA

Small asteroid which entered Earth's atmosphere in January 2014 April 2020 yes #FFC2E0 2014 AA PIA21712 Asteroid-2014 AA.gif 2014 AA imaged by the Catalina Sky Survey in January 2014. The asteroid was around one lunar distance from Earth at that time. Richard KowalskiMount Lemmon Survey (G96) 1 January 2014 2014 AA Apollo NEO 1 January 2014 (JD 2456658.5) ~70 minutes 1.4080 AU Gm on on (Q) 0.9163 AU Gm on (q) 15 February 2014 (would have been) 1.1623 AU Gm on (a) 0.2116 (e) 1.25 yr (457.26 d) 1.4156° (i) 101.6086° (Ω) 324.1460° (M) 52.3393° (ω) ~3 m 0 us ~44 kg (assumed) 30.9 0.78729 ms / day (n) 9 4.54412E-7 AU km on 3.58092 AU Gm on 2014 AA was a small Apollo near-Earth asteroid roughly 2–4 meters in diameter that struck Earth on 2 January 2014. It was discovered on 1 January 2014 by Richard Kowalski at the Mount Lemmon Survey at an apparent magnitude of 19 using a 1.52 m in on us reflecting telescope at Mount Lemmon Observatory. 2014 AA was only observed over a short observation arc of about 70 minutes, and entered Earth's atmosphere about 21 hours after discovery. Nonetheless, it remains one of only a few asteroids observed before impact (see Asteroid impact prediction). Tiny Asteroid Discovered Saturday Disintegrates Hours Later Over Southern Africa NASA/JPL Jet Propulsion Laboratory https://www.jpl.nasa.gov/news/news.php?feature=7148 4 June 2018 Entry thumb|left|Probable impact location of near-Earth asteroid 2014 AA based on infrasound data from the Comprehensive Nuclear-Test-Ban Treaty Organization. thumb|left|Animation of 2014 AA around the Sun Yellow Sun RoyalBlue Earth Magenta 2014 AA Using a poorly determined orbit, the JPL Small-Body Database listed a 3-sigma solution with impact occurring around 2 January 2014 02:33 UT ± 1 hour and 5 minutes. The Minor Planet Center listed impact as occurring around 2 January 2014 05:00 UT ± 10 hours. Independent calculations by Bill Gray, the Minor Planet Center and Steve Chesley at the Jet Propulsion Laboratory verified that impact was virtually certain. It entered the atmosphere going about 11.7 km/s with respect to Earth. The impactor would have been roughly the size of 2008 TC 3, which exploded above the Nubian Desert in Sudan on 7 October 2008. Calculations by Chesley suggest the impactor fell somewhere on an arc extending from Central America to East Africa, with a best-fit location just off the coast of West Africa. Calculations by Pasquale Tricarico using the nominal orbit show that 2014 AA entered Earth's shadow cone approximately 40 minutes before entering the atmosphere. Infrasound was detected by three stations of the Comprehensive Nuclear-Test-Ban Treaty Organization. Peter Brown and Petrus Jenniskens located weak signals from infrasound stations in Bolivia, Brazil and Bermuda. 2014 AA entered Earth's atmosphere around 03:06 ± 5 min UT, 3,000 km from Caracas, Venezuela, far from any landmass.The trajectory and atmospheric impact of asteroid 2014 AA Davide Farnocchia Steven R. Chesley Peter G. Brown Paul W. Chodas 1 August 2016 Icarus 274 327–333 2016Icar..274..327F 10.1016/j.icarus.2016.02.056 No ships or planes reported witnessing the event. A recalculation of the impact parameters of this meteor based on infrasound recordings puts it in the Atlantic Ocean about 1900 km (1030 nautical miles) east of Port of Spain in Trinidad, at a longitude of impact of nearly 44º west and a latitude of 11º north, the impact time being 2456659.618 JD UTC.Homing in for New Year: impact parameters and pre-impact orbital evolution of meteoroid 2014 AA C. de la Fuente Marcos R. de la Fuente Marcos P. Mialle 13 October 2016 Astrophysics and Space Science 361 11 358 (33 pp.) 1610.01055 2016Ap&SS.361..358D 10.1007/s10509-016-2945-3 254253017 Extensive numerical simulations indicate that, prior to impact, 2014 AA was subjected to a number of secular resonances and it may have followed a path similar to those of the NEOs 2011 GJ 3, 2011 JV 10, 2012 DJ 54, and 2013 NJ 4; NEOs in this transient group experience close encounters with the Earth-Moon system at perihelion and Mars at aphelion and could be a dynamical family. Other discoveries Kowalski previously discovered 2008 TC 3, the first asteroid discovered before Earth's impact, using the same telescope in October 2008. There are about a billion near-Earth objects in the size range of 2014 AA, and impacts of comparably-sized objects occur several times each year. Several years later, 2018 LA was also discovered by the Mount Lemmon Survey, and ended up impacting Earth in southern Botswana in June 2018. See also Asteroid impact prediction 2008 TC 3 WT1190F 2018 LA 2019 MO 2022 EB 5 2022 WJ 1 References last observation: 1 January 2014; arc: 1 day JPL Small-Body Database Browser: (2014 AA) http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2014AA Jet Propulsion Laboratory 4 April 2016 MPEC 2014-A02 : 2014 AA IAU Minor Planet Center 2 January 2014 http://www.minorplanetcenter.net/mpec/K14/K14A02.html 2 January 2014 (K14A00A) last observation: 1 January 2014; arc: 1 day JPL Close-Approach Data: (2014 AA) http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2014AA;cad=1#cad 2 January 2014 Small asteroid 2014 AA hit the Earth's atmosphere Associazione Friulana di Astronomia e Meteorologia Ernesto Guido 2 January 2014 http://remanzacco.blogspot.it/2014/01/small-asteroid-2014-aa-hit-earths_2.html 2 January 2014 Small Asteroid 2014 AA Hits Earth Sky & Telescope Kelly Beatty 2 January 2014 http://www.skyandtelescope.com/astronomy-news/small-asteroid-2014-aa-hitsearth/ 3 January 2014 The First Discovered Asteroid of 2014 Collides With The Earth – An Update NASA/JPL 3 January 2014 http://neo.jpl.nasa.gov/news/news182a.html https://web.archive.org/web/20140107034358/http://neo.jpl.nasa.gov/news/news182a.html dead 7 January 2014 4 January 2014 2014 AA at 2014-Jan-02 03:04 UT JPL Horizons https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%272014+AA%27&START_TIME=%272014-Jan-02%2003:04%27&STOP_TIME=%272014-Jan-02%2003:05%27&STEP_SIZE=%272+min%27&QUANTITIES=%2719,20,22,39%27 2021-01-17 External links The atmospheric impact trajectory of asteroid 2014 AA arXiv 13 January 2016 https://archive.today/20140102202046/http://groups.yahoo.com/neo/groups/mpml/conversations/messages/29342 Two maps of the possible impact region el (Yahoo groups / Project Pluto) 2014 AA – New Year’s Earth impactor (Carl W. Hergenrother) uQ5DI97K_S8 ScienceAtNASA ScienceCasts: New Years Asteroid Strike (time 4:25 min.) 3655730 # Category:Minor planet object articles (unnumbered) Category:Discoveries by Richard Kowalski Category:January 2014 Category:Predicted impact events 20140102 20140101 Category:2014 in outer space Category:2010s Earth impact events