Astronomy:2011 CQ1

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Short description: 2nd closest non-impacting Earth approach


2011 CQ1
Discovery[1]
Discovered byCatalina Sky Survey
Richard A. Kowalski
Discovery date4 February 2011
Designations
2011 CQ1
Minor planet category
Orbital characteristics[2]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 5
Observation arc12.4 hours[3]
(35 observations used)
|{{{apsis}}}|helion}}1.0087 astronomical unit|AU (150.90 Gm) (Q)
|{{{apsis}}}|helion}}0.66454 AU (99.414 Gm) (q)
0.83661 AU (125.155 Gm) (a)
Eccentricity0.20567 (e)
Orbital period0.77 yr (279.5 d)
Mean anomaly18.607° (M)
Mean motion1.2880°/day (n)
Inclination5.2445° (i)
Longitude of ascending node315.23° (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)
Apparent magnitude14.2 (2011 peak)[4]
Absolute magnitude (H)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

References

  1. ↑ 1.0 1.1 "MPEC 2011-C12 : 2011 CQ1". IAU Minor Planet Center. 2011-02-04. http://www.minorplanetcenter.net/mpec/K11/K11C12.html. Retrieved 2013-02-27.  (K11C01Q)
  2. ↑ 2.0 2.1 2.2 2.3 "JPL Close-Approach Data: (2011 CQ1)". https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=2011CQ1&view=OPC. 
  3. ↑ "2011 CQ1". Minor Planet Center. http://www.minorplanetcenter.net/db_search/show_object?object_id=2011+CQ1. Retrieved 2020-08-21. 
  4. ↑ "2011 CQ1 Ephemerides for 4 February 2011". NEODyS (Near Earth Objects – Dynamic Site). https://newton.spacedys.com/neodys/index.php?pc=1.1.3.1&n=2011CQ1&oc=500&y0=2011&m0=2&d0=4&h0=0&mi0=0&y1=2011&m1=2&d1=5&h1=0&mi1=0&ti=15&tiu=minutes. Retrieved 2013-02-28. 
  5. ↑ 5.0 5.1 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. https://web.archive.org/web/20110902004227/http://neo.jpl.nasa.gov/news/news170.html. Retrieved 18 September 2011. 
  6. ↑ "Date/Time Removed". NASA/JPL Near-Earth Object Program Office. http://neo.jpl.nasa.gov/risk/removed.html. Retrieved 2012-03-19. 

External links



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