2011 CQ1

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°

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~1 meter (39 in)
14.2 (2011 peak)[4]
32.1[2]

    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
    Asteroid Date Distance from
    surface of Earth    		 Uncertainty in
    approach distance    		 Reference
    2020 VT42020-11-13374 km±25 kmdata
    2020 QG2020-08-162946 km±20 kmdata
    2011 CQ12011-02-045481 km±5 kmdata
    2019 UN132019-10-316242 km±200 kmdata
    2008 TS262008-10-096259 km±1000 kmdata
    2004 FU1622004-03-316542 km±15000 kmdata

    References
    1. "MPEC 2011-C12 : 2011 CQ1". IAU Minor Planet Center. 4 February 2011. Retrieved 27 February 2013. (K11C01Q)
    2. "JPL Close-Approach Data: (2011 CQ1)" (last observation: 2011-02-04; arc: 1 day). 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. 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. Retrieved 19 March 2012.
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