2011 XC2

Near-Earth asteroid February 2018 {{DISPLAYTITLE:2011 XC2}} yes #FFC2E0 2011 XC 2 LINEAR (704) 8 December 2011 2011 XC 2 ApolloNEO 13 January 2016 (JD 2457400.5) 22 days 3.1579 AU Gm on on (Q) 0.83844 AU Gm on (q) 1.9982 AU Gm on (a) 0.58040 (e) 2.82 yr (1031.7 d) 28.768° (i) 70.686° (Ω) 176.76° (M) 306.58° (ω) ~85 m us60–140 meters 8.48 kg (assumed) 23.2 0.34894 ms /day (n) 7 0.00132534 AU km on 2.67756 AU Gm on 2011 XC 2 is a near-Earth asteroid roughly 60 - 140 m us in diameter that passed less than 1 lunar distance from Earth on 3 December 2011. From mid October 2011 until 3 December 2011 15:00 UT the small dim asteroid had an elongation less than 60 degrees from the Sun. (While less than 18 degrees from the Sun any dim asteroid can be lost in astronomical twilight, and many observatories can not see below ~40 degrees from the horizon.) On 3 December 2011 at 15:20 UT the asteroid passed 0.0023 AU km mi on on from Earth and at 16:20 UT passed 0.0016 AU km mi on off from the Moon. The asteroid was then discovered on 8 December 2011 by Lincoln Near-Earth Asteroid Research (LINEAR) at an apparent magnitude of 19 using a 1.0 m in on us reflecting telescope. At the time of discovery the asteroid was near opposition to the Sun. It has an observation arc of 22 days with an uncertainty parameter of 7. Virtual clones of the asteroid that fit the uncertainty region in the known trajectory show a 1 in 455,000 chance that the asteroid will impact Earth on 2 December 2056. With a 2056 Palermo Technical Scale of −4.35, the odds of impact by 2011 XC 2 in 2056 are about 22387 times less than the background hazard level of Earth impacts which is defined as the average risk posed by objects of the same size or larger over the years until the date of the potential impact. Using the nominal orbit, JPL Horizons shows that the asteroid will be 3.8 AU km mi on off from Earth on 2 December 2056. +H < 24 asteroids passing less than 1 LD from EarthAsteroidDateNominal approach distance (LD)Min. distance (LD)Max. distance (LD)Absolute magnitude (H)Size (meters)(152680) 1998 KJ 9 1914-12-31 0.606 0.604 0.608 19.4 279–900(458732) 2011 MD 5 1918-09-17 0.911 0.909 0.913 17.9 556–1795(163132) 2002 CU 11 1925-08-30 0.903 0.901 0.905 18.5 443–4772010 VB 1 1936-01-06 0.553 0.553 0.553 23.2 48–1562002 JE 9 1971-04-11 0.616 0.587 0.651 21.2 122–3932013 UG 1 1976-10-17 0.854 0.853 0.855 22.3 73–2372012 TY 52 1981-11-04 0.818 0.813 0.823 21.4 111–3582012 UE 34 1991-04-08 0.847 0.676 1.027 23.3 46–1492017 VW 13 2001-11-08 0.454 0.318 3.436 20.7 153–4942002 MN 2002-06-14 0.312 0.312 0.312 23.6 40–130(308635) 2005 YU 55 2011-11-08 0.845 0.845 0.845 21.9 320–4002011 XC 2 2011-12-03 0.904 0.901 0.907 23.2 48–1562018 AH 2018-01-02 0.773 0.772 0.773 22.5 67–2162018 GE 3 2018-04-15 0.502 0.501 0.503 23.7 35–135(153814) 2001 WN 5 2028-06-26 0.647 0.647 0.647 18.2 921–94399942 Apophis 2029-04-13 0.0981 0.0963 0.1000 19.7 310–3402012 UE 34 2041-04-08 0.283 0.274 0.354 23.3 46–1492015 XJ 351 2047-06-06 0.789 0.251 38.135 22.4 70–2262007 TV 18 2058-09-22 0.918 0.917 0.919 23.8 37–1192005 WY 55 2065-05-28 0.865 0.856 0.874 20.7 153–494(308635) 2005 YU 55 2075-11-08 0.592 0.499 0.752 21.9 320–400(456938) 2007 YV 56 2101-01-02 0.621 0.615 0.628 21.0 133–4312007 UW 1 2129-10-19 0.239 0.155 0.381 22.7 61–197101955 Bennu 2135-09-25 0.780 0.308 1.406 20.19 472–512(153201) 2000 WO 107 2140-12-01 0.634 0.631 0.637 19.3 427–5932009 DO 111 2146-03-23 0.896 0.744 1.288 22.8 58–188(85640) 1998 OX 4 2148-01-22 0.771 0.770 0.771 21.1 127–4112007 UY 1 2156-02-13 0.685 0.652 6.856 22.9 56–1792011 LT 17 2156-12-16 0.998 0.955 1.215 21.6 101–327 References last observation: 2011-12-30; arc: 22 days JPL Small-Body Database Browser: (2011 XC2) http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2011XC2 https://web.archive.org/web/20190528050534/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2011XC2 dead 28 May 2019 Jet Propulsion Laboratory 1 April 2016 MPEC 2011-X35 : 2011 XC2 IAU Minor Planet Center 2011-12-11 http://www.minorplanetcenter.net/mpec/K11/K11X35.html 2014-02-20 (K11X02C) last observation: 2011-12-30; arc: 22 days JPL Close-Approach Data: (2011 XC2) http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2011XC2;cad=1#cad 2014-02-20 Earth Impact Risk Summary: 2011 XC2 NASA/JPL Near-Earth Object Program Office https://cneos.jpl.nasa.gov/sentry/details.html#?des=2011%20XC2 2014-02-20 Math: 104.35 = 22387 31 Aug 2005 The Palermo Technical Impact Hazard Scale NASA/JPL Near-Earth Object Program Office http://neo.jpl.nasa.gov/risk/doc/palermo.html https://web.archive.org/web/20020321092747/http://neo.jpl.nasa.gov/risk/doc/palermo.html dead 21 March 2002 2014-02-20 Absolute Magnitude (H) NASA/JPL http://neo.jpl.nasa.gov/glossary/h.html https://web.archive.org/web/20010302182040/http://neo.jpl.nasa.gov/glossary/h.html dead 2001-03-02 2014-02-20 2011XC2 Ephemerides for 11 October 2011 through 17 December 2011 NEODyS (Near Earth Objects – Dynamic Site) http://newton.spacedys.com/neodys/index.php?pc=1.1.3.1&n=2011XC2&oc=500&y0=2011&m0=10&d0=11&h0=0&mi0=0&y1=2011&m1=12&d1=17&h1=0&mi1=0&ti=1.0&tiu=days 2014-02-20 Horizons output http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2011XC2 Horizon Online Ephemeris System 2014-02-20 (Geocentric Solution) External links 2011+XC2 2011XC2 3590911 (308635) 2005 YU 55 Large NEO Earth close approach(inside the orbit of the Moon) 3 December 2011 367943 Duende (2012 DA 14) # Category:Minor planet object articles (unnumbered) * 20111203 20111208