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2011 XC2

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2011 XC2
Discovery[1]
Discovered byLINEAR(704)
Discovery date8 December 2011
Designations
2011 XC2
ApolloApollo
NEO[2]
Orbital characteristics[2]
Epoch13 January 2016 (JD2457400.5)
Uncertainty parameter7
Observation arc22 days
Aphelion3.1579AU(472.42Gm) (Q)
Perihelion0.83844 AU (125.429 Gm) (q)
1.9982 AU (298.93 Gm) (a)
Eccentricity0.58040 (e)
2.82yr(1031.7d)
176.76°(M)
0° 20m56.184s/day (n)
Inclination28.768° (i)
70.686° (Ω)
306.58° (ω)
EarthMOID0.00132534 AU (198,268 km)
JupiterMOID2.67756 AU (400.557 Gm)
Physical characteristics
Dimensions~85 meters (279 ft)[3]
60–140 meters[4]
Mass8.4×108kg (assumed)[3]
23.2[2]

2011 XC2(also written2011 XC2) is anear-Earth asteroidroughly 60–140 meters (200–460 ft) in diameter that passed less than 1lunar distancefrom Earth on 3 December 2011.[5]

From mid October 2011 until 3 December 2011 15:00UTthe small dim asteroid had anelongationless than 60 degrees from the Sun.[6](While less than 18 degrees from the Sun any dim asteroid can be lost inastronomical twilight,and manyobservatoriescan not see below ~40 degrees from thehorizon.) On 3 December 2011 at 15:20 UT the asteroid passed 0.0023AU(340,000km;210,000mi) from Earth and at 16:20 UT passed 0.0016 AU (240,000 km; 150,000 mi) from the Moon.[5]The asteroid was then discovered on 8 December 2011 byLincoln Near-Earth Asteroid Research(LINEAR) at anapparent magnitudeof 19 using a 1.0-meter (39 in)reflecting telescope.[1]At the time of discovery the asteroid was nearoppositionto the Sun.[6]

It has an observation arc of 22 days with anuncertainty parameterof 7.[2]Virtual clones of the asteroid that fit the uncertainty region in the known trajectory show a 1 in 455,000 chance that the asteroid willimpactEarth on 2 December 2056.[3]With a 2056Palermo Technical Scaleof −4.35,[3]the odds of impact by2011 XC2in 2056 are about 22387 times less[7]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.[8]Using thenominalorbit,JPL Horizonsshows that the asteroid will be 3.8 AU (570,000,000 km; 350,000,000 mi) from Earth on 2 December 2056.[9]

References

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  1. ^ab"MPEC 2011-X35: 2011 XC2".IAU Minor Planet Center.11 December 2011.Retrieved20 February2014.(K11X02C)
  2. ^abcd"JPL Small-Body Database Browser: (2011 XC2)"(last observation: 2011-12-30;arc:22 days).Jet Propulsion Laboratory.Archived fromthe originalon 28 May 2019.Retrieved1 April2016.
  3. ^abcd"Earth Impact Risk Summary: 2011 XC2".NASA/JPL Near-Earth Object Program Office.Retrieved20 February2014.
  4. ^"Absolute Magnitude (H)".NASA/JPL. Archived fromthe originalon 2 March 2001.Retrieved20 February2014.
  5. ^ab"JPL Close-Approach Data: (2011 XC2)"(last observation: 2011-12-30;arc:22 days).Retrieved20 February2014.
  6. ^ab"2011XC2 Ephemerides for 11 October 2011 through 17 December 2011".NEODyS(Near Earth Objects – Dynamic Site).Retrieved20 February2014.
  7. ^Math: 104.35= 22387
  8. ^"The Palermo Technical Impact Hazard Scale".NASA/JPL Near-Earth Object Program Office. 31 August 2005. Archived fromthe originalon 21 March 2002.Retrieved20 February2014.
  9. ^Horizonsoutput."Horizon Online Ephemeris System".Retrieved20 February2014.(Geocentric Solution)
[edit]
Preceded by LargeNEOEarth close approach
(inside the orbit of the Moon)
3 December 2011 		Succeeded by
367943 Duende(2012 DA14)
Retrieved from "https://en.wikipedia.org/w/index.php?title=2011_XC2&oldid=1187132998"