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2011 CQ1

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2011 CQ1
Discovery[1]
Discovered byCatalina Sky Survey
Richard A. Kowalski
Discovery date4 February 2011
Designations
2011 CQ1
Orbital characteristics[2]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 5
Observation arc12.4 hours[3]
(35 observations used)
Aphelion1.0087 AU (150.90 Gm) (Q)
Perihelion0.66454 AU (99.414 Gm) (q)
0.83661 AU (125.155 Gm) (a)
Eccentricity0.20567 (e)
0.77 yr (279.5 d)
18.607° (M)
1.2880°/day (n)
Inclination5.2445° (i)
315.23° (Ω)
335.40° (ω)
Earth MOID0.000166307 AU (24,879.2 km)
Jupiter MOID4.09715 AU (612.925 Gm)
Physical characteristics
Dimensions~2 meters (79 in)
14.2 (2011 peak)[4]
32.1[2]

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

[edit]
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

[edit]
  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.
[edit]
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