List of asteroid close approaches to Earth in 2011 explained

Time of discovery of asteroids which came closer to Earth than the moon in 2011
Other Years
Caption:Years
Below:2009, 2010, 2011, 2012, 2013
Below is the list of asteroid close approaches to Earth in 2011.

Timeline of close approaches less than one lunar distance from Earth in 2011

A list of known near-Earth asteroid close approaches less than 1 lunar distance (384,400 km or 0.00256 AU) from Earth in 2011.[1]

This list does not include any of the objects that collided with earth in 2011, none of which were discovered in advance, but were recorded by sensors designed to detect detonation of nuclear devices.

Date of
closest
approach 		Date
discovered		Object Nominal geocentric
distance (AU)[2] 		Size (m)
(approximate)
[3] 		(H) Closer
approach
to Moon		width=120 Refs[4] [5]
2011-01-11 2011-01-13 0.00086abbr=onNaNabbr=on 6 29.7[6]
2011-01-17 2011-01-14 0.00213abbr=onNaNabbr=on 11 28.6[7] Yes
2011-01-20 2011-01-24 0.00238abbr=onNaNabbr=on 22 27.1[8] Yes
2011-01-25 2011-01-26 0.00086abbr=onNaNabbr=on 13 28.3[9]
2011-01-31 2011-02-05 0.00165abbr=onNaNabbr=on 22 27.1[10]
2011-02-04 2011-02-04 7.9E-05abbr=onNaNabbr=on 1 32.1[11]
2011-02-06 2011-02-07 0.00026abbr=onNaNabbr=on 3 30.9[12]
2011-02-09 2011-02-07 0.00069abbr=onNaNabbr=on 5 30.3[13]
2011-02-23 2011-02-27 0.00192abbr=onNaNabbr=on 27 26.7[14]
2011-03-03 2011-03-04 0.00166abbr=onNaNabbr=on 15 27.9[15]
2011-03-07 2011-03-05 0.000876abbr=onNaNabbr=on 11 28.5[16]
2011-03-08 2011-03-10 0.00161abbr=onNaNabbr=on 14 28.0[17]
2011-04-06 2011-04-04 0.00132abbr=onNaNabbr=on 14 28.1[18]
2011-04-06 2011-04-04 0.00063abbr=onNaNabbr=on 7 29.4[19]
2011-05-05 2011-05-08 0.00231abbr=onNaNabbr=on 6 29.7[20] Yes
2011-06-02 2009-01-16 0.00231325abbr=onNaNabbr=on 14 28.1[21]
2011-06-27 2011-06-22 0.00012467abbr=onNaNabbr=on 14 28.0[22]
2011-07-24 2011-08-06 0.00224abbr=onNaNabbr=on 60 25.0[23] Yes
2011-07-28 2011-07-31 0.00115abbr=onNaNabbr=on 30 26.5[24]
2011-09-27 2011-09-23 0.00158abbr=onNaNabbr=on 16 27.8[25]
2011-09-28 2011-10-01 0.00086abbr=onNaNabbr=on 30 26.3[26]
2011-09-30 2011-09-29 0.00194abbr=onNaNabbr=on 16 27.8[27]
2011-10-12 2011-10-17 0.0015abbr=onNaNabbr=on 37 26.0[28] Yes
2011-10-17 2009-10-15 0.00219AU align=center 6–12 align=center 28.4 align=center Yes
2011-10-26 2011-10-27 0.00177abbr=onNaNabbr=on 13 28.3[29]
2011-10-28 2011-10-30 0.00092abbr=onNaNabbr=on 19 27.4[30]
2011-11-08 2005-12-28 0.00217202abbr=onNaNabbr=on 360 21.9[31] Yes
2011-12-03 2011-12-08 0.00232abbr=onNaNabbr=on 100 23.1[32] Yes
2011-12-28 2011-12-29 0.00071abbr=onNaNabbr=on 6 29.7[33]
2011-12-29 2012-01-01 0.00179abbr=onNaNabbr=on 4 30.7[34]
2011-12-30 2011-12-31 0.00161abbr=onNaNabbr=on 9 29.0[35]

Warning Times by Size

This sub-section visualises the warning times of the close approaches listed in the above table, depending on the size of the asteroid. The sizes of the charts show the relative sizes of the asteroids to scale. For comparison, the approximate size of a person is also shown. This is based the absolute magnitude of each asteroid, an approximate measure of size based on brightness.

Abs Magnitude 30 and greater (size of a person for comparison)Abs Magnitude 29-30Absolute Magnitude 28-29Absolute Magnitude 27-28Absolute Magnitude 26-27Absolute Magnitude 25-26 Absolute Magnitude less than 25 (largest)

See also

Notes

Notes and References

  1. For a list of current Earth close approaches see NEO Earth Close Approaches
  2. Distance from the center of Earth to the center of the object. See the NASA/JPL Solar System Dynamics Glossary: Geocentric. Earth has a radius of approximately 6,400 km.
  3. For asteroids without a well determined size an albedo of 0.05 is assumed. An albedo of 0.05 establishes an approximate upper limit to the size of the asteroid.
  4. Web site: JPL Small-Body Database Browser . https://web.archive.org/web/20060612225025/http://ssd.jpl.nasa.gov/sbdb.cgi . dead . 2006-06-12 . JPL Solar System Dynamics . NASA Jet Propulsion Laboratory.
  5. Web site: MPC Database . IAU Minor Planet Center . International Astronomical Union . 1 January 2021.
  6. Web site: JPL Small-Body Database Browser: (2011 AM37) . 2011-01-14 last obs.
  7. Web site: JPL Small-Body Database Browser: (2011 AN52) . 2011-01-17 last obs.
  8. Web site: JPL Small-Body Database Browser: (2011 BY10) . 2011-01-30 last obs.
  9. Web site: JPL Small-Body Database Browser: (2011 BW11) . 2011-01-28 last obs.
  10. Web site: JPL Small-Body Database Browser: (2011 CA4) . 2011-02-10 last obs.
  11. Web site: JPL Small-Body Database Browser: (2011 CQ1) . 2011-02-04 last obs.
  12. Web site: JPL Small-Body Database Browser: (2011 CF22) . 2011-02-07 last obs.
  13. Web site: JPL Small-Body Database Browser: (2011 CA7) . 2011-02-08 last obs.
  14. Web site: JPL Small-Body Database Browser: (2011 DU9) . 2011-03-11 last obs.
  15. Web site: JPL Small-Body Database Browser: (2011 EN11) . 2011-03-05 last obs.
  16. Web site: JPL Small-Body Database Browser: (2011 EY11) . 2011-03-07 last obs.
  17. Web site: JPL Small-Body Database Browser: (2011 EM40) . 2011-03-14 last obs.
  18. Web site: JPL Small-Body Database Browser: (2011 GW9) . 2011-04-05 last obs.
  19. Web site: JPL Small-Body Database Browser: (2011 GP28) . 2011-04-05 last obs.
  20. Web site: JPL Small-Body Database Browser: (2011 JV10) . 2011-05-10 last obs.
  21. Web site: JPL Small-Body Database Browser: (2009 BD) . 2011-06-20 last obs (arc=2.4 yr).
  22. Web site: JPL Small-Body Database Browser: (2011 MD) . 2011-07-03 last obs (arc=12 days).
  23. Web site: JPL Small-Body Database Browser: (2011 PU1) . 2011-09-21 last obs (arc=46 days).
  24. Web site: JPL Small-Body Database Browser: (2011 OD18) . 2011-08-08 last obs.
  25. Web site: JPL Small-Body Database Browser: (2011 SE58) . 2011-09-27 last obs.
  26. Web site: JPL Small-Body Database Browser: (2011 TO) . 2013-01-12 last obs (arc=1.28 yr).
  27. Web site: JPL Small-Body Database Browser: (2011 SM173) . 2011-09-30 last obs.
  28. Web site: JPL Small-Body Database Browser: (2011 UT) . 2011-11-24 last obs (arc=38 days).
  29. Web site: JPL Small-Body Database Browser: (2011 UL169) . 2011-10-31 last obs.
  30. Web site: JPL Small-Body Database Browser: (2011 UX255) . 2011-11-01 last obs.
  31. Web site: JPL Small-Body Database Browser: (2005 YU55) . 2011-12-16 last obs.
  32. Web site: JPL Small-Body Database Browser: (2011 XC2) . 2011-12-30 last obs (arc=22 days).
  33. Web site: JPL Small-Body Database Browser: (2011 YC40) . 2011-12-30 last obs.
  34. Web site: JPL Small-Body Database Browser: (2012 AQ) . 2012-01-03 last obs.
  35. Web site: JPL Small-Body Database Browser: (2011 YC63) . 2012-01-01 last obs.

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