is a meteoroid discovered on 4 February 2011 by Richard A. Kowalski, at the Catalina Sky Survey. On the same day the meteoroid passed within 0.85 Earth radii ( of Earth's surface, and was perturbed from the Apollo class to the Aten class of near-Earth objects. With a relative velocity of only 9.7 km/s, had the asteroid passed less than 0.5 Earth radii from Earth's surface, it would have fallen as a brilliant fireball. The meteoroid is between and wide. The meteoroid was removed from the Sentry Risk Table on 5 February 2011.
ParameterEpoch aphelion(Q) perihelion(q) Semi-majoraxis(a) eccentricity(e) Period(p) inclination(i) Longitudeascendingnode(Ω) Meananomaly(M) Argumentofperihelion(ω) UnitsAU (days) (°)Pre-flyby 2011-Jan-26 1.347 0.9096 1.128 0.1940 437.9 1.073° 135.4° 310.9° 58.59° Post-flyby 2011-Feb-08 1.009 0.6624 0.8360 0.2076 279.2 5.296° 315.4° 220.6° 335.1°
It was not until 2020 QG on 16 August 2020 that a non-impacting closer approach to Earth was observed.
See also
References (K11C01Q)
External links Tiny Asteroid Zips Close By Earth space.com 6 February 2011 Asteroid makes sharpest turn yet seen in solar system New Scientist 9 February 2011 Asteroid's Record-Breaking Brush with Earth Changed It Forever Space.com 23 February 2011