2011 CQ1
2011 CQ1 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 (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. 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 80 centimeters (31 in) and 2.6 meters (100 in) wide. The meteoroid was removed from the Sentry Risk Table on 5 February 2011.
| 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° |
| Discovery | |
|---|---|
| Discovered by | Catalina Sky Survey Richard A. Kowalski |
| Discovery date | 4 February 2011 |
| Designations | |
MPC designation | 2011 CQ1 |
Minor planet category |
|
| Orbital characteristics | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 5 | |
| Observation arc | 12.4 hours (35 observations used) |
| Aphelion | 1.0087 AU (150.90 Gm) (Q) |
| Perihelion | 0.66454 AU (99.414 Gm) (q) |
Semi-major axis | 0.83661 AU (125.155 Gm) (a) |
| Eccentricity | 0.20567 (e) |
Orbital period (sidereal) | 0.77 yr (279.5 d) |
Mean anomaly | 18.607° (M) |
Mean motion | 1.2880°/day (n) |
| Inclination | 5.2445° (i) |
Longitude of ascending node | 315.23° (Ω) |
| 335.40° (ω) | |
| Earth MOID | 0.000166307 AU (24,879.2 km) |
| Jupiter MOID | 4.09715 AU (612.925 Gm) |
| Physical characteristics | |
| Dimensions | ~2 meters (79 in) |
| 14.2 (2011 peak) | |
| 32.1 | |
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
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