2011 CQ1 is a meteoroid discovered on 4 February 2011 by Richard A. Kowalski, at the Catalina Sky Survey.[1] On the same day the meteoroid passed within 0.85 Earth radii (5,480 kilometers (3,410 mi)) of Earth's surface, and was perturbed from the Apollo class to the Aten class of near-Earth objects.[5] With a relative velocity of only 9.7 km/s,[2] 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 80 centimeters (31 in) and 2.6 meters (100 in) wide.[5] The meteoroid was removed from the Sentry Risk Table on 5 February 2011.[6]

Parameter Epoch aphelion
(Q) 		perihelion
(q) 		Semi-major
axis
(a) 		eccentricity
(e) 		Period
(p) 		inclination
(i) 		Longitude
ascending
node
(Ω) 		Mean
anomaly
(M) 		Argument
of
perihelion
(ω)
Units AU (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.

Animation of 2011 CQ1's orbit - 2011 flyby
Around the Sun
Around the Earth
   Sun ·   2011 CQ1 ·   Earth

See also

Closest non-impacting asteroids to Earth, except Earth-grazing fireballs
(using JPL SBDB numbers and Earth radius of 6,378 km)
Asteroid Date Distance from
surface of Earth 		Uncertainty in
approach distance 		Observation arc Reference
2020 VT4 2020-11-13 17:21 368 km ±11 km 5 days (34 obs) data
2020 QG 2020-08-16 04:09 2939 km ±11 km 2 days (35 obs) data
2021 UA1 2021-10-25 03:07 3049 km ±10 km 1 day (22 obs) data
2023 BU 2023-01-27 00:29 3589 km ±<1 km 10 days (231 obs) data
2011 CQ1 2011-02-04 19:39 5474 km ±5 km 1 day (35 obs) data
2019 UN13 2019-10-31 14:45 6235 km ±189 km 1 day (16 obs) data
2008 TS26 2008-10-09 03:30 6260 km ±970 km 1 day (19 obs) data
2004 FU162 2004-03-31 15:35 6535 km ±13000 km 1 day (4 obs) data

References

  1. ^ a b "MPEC 2011-C12 : 2011 CQ1". IAU Minor Planet Center. 4 February 2011. Retrieved 27 February 2013. (K11C01Q)
  2. ^ a b c d "JPL Close-Approach Data: (2011 CQ1)" (last observation: 2011-02-04; arc: 1 day). Archived from the original on 28 June 2021. Retrieved 31 March 2016.
  3. ^ "2011 CQ1". Minor Planet Center. Retrieved 21 August 2020.
  4. ^ "2011 CQ1 Ephemerides for 4 February 2011". NEODyS (Near Earth Objects – Dynamic Site). Retrieved 28 February 2013.
  5. ^ a b Don Yeomans & Paul Chodas (4 February 2011). "Very Small Asteroid Makes Close Earth Approach on 4 February 2011". News. NASA/JPL Near-Earth Object Program Office. Archived from the original on 2 September 2011. Retrieved 18 September 2011.
  6. ^ "Date/Time Removed". NASA/JPL Near-Earth Object Program Office. Archived from the original on 2 June 2002. Retrieved 19 March 2012.
Allikas: https://en.wikipedia.org/wiki/2011_CQ1
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