List of asteroid close approaches to Earth in 2011

Below is the list of asteroid close approaches to Earth in 2011.

Time of discovery of asteroids which came closer to Earth than the moon in 2011

After closest approach: 19 (61.3%)< 24 hours before: 1 (3.2%)up to 7 days before: 9 (29.0%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 2 (6.5%)

  •   After closest approach: 19 (61.3%)
  •   < 24 hours before: 1 (3.2%)
  •   up to 7 days before: 9 (29.0%)
  •   > one week before: 0 (0.0%)
  •   > 7 weeks before: 0 (0.0%)
  •   > one year before: 2 (6.5%)

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.[note 1]

  Rows highlighted red indicate objects which were not discovered until after closest approach

  Rows highlighted yellow indicate objects discovered less than 24 hours before closest approach

  Rows highlighted green indicate objects discovered more than one week before closest approach

  Rows highlighted turquoise indicate objects discovered more than 7 weeks before closest approach

  Rows highlighted blue indicate objects discovered more than one year before closest approach (i.e.
objects successfully cataloged on a previous orbit, rather than being detected during final approach)

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		 ObjectNominal geocentric
distance (AU)[note 2]		Size (m)
(approximate)
[note 3]		(H)Closer
approach
to Moon		 Refs[1][2]
2011-01-112011-01-132011 AM370.00086 AU (129,000 km; 80,000 mi)629.7[3]data · 2011 AM37
2011-01-172011-01-142011 AN520.00213 AU (319,000 km; 198,000 mi)1128.6[4]Yesdata · 2011 AN52
2011-01-202011-01-242011 BY100.00238 AU (356,000 km; 221,000 mi)2227.1[5]Yesdata · 2011 BY10
2011-01-252011-01-262011 BW110.00086 AU (129,000 km; 80,000 mi)1328.3[6]data · 2011 BW11
2011-01-312011-02-052011 CA40.00165 AU (247,000 km; 153,000 mi)2227.1[7]data · 2011 CA4
2011-02-042011-02-042011 CQ10.000079 AU (11,800 km; 7,300 mi)132.1[8]data · 2011 CQ1
2011-02-062011-02-072011 CF220.00026 AU (39,000 km; 24,000 mi)330.9[9]data · 2011 CF22
2011-02-092011-02-072011 CA70.00069 AU (103,000 km; 64,000 mi)530.3[10]data · 2011 CA7
2011-02-232011-02-272011 DU90.00192 AU (287,000 km; 178,000 mi)2726.7[11]data · 2011 DU9
2011-03-032011-03-042011 EN110.00166 AU (248,000 km; 154,000 mi)1527.9[12]data · 2011 EN11
2011-03-072011-03-052011 EY110.000876 AU (131,000 km; 81,400 mi)1128.5[13]data · 2011 EY11
2011-03-082011-03-102011 EM400.00161 AU (241,000 km; 150,000 mi)1428.0[14]data · 2011 EM40
2011-04-062011-04-042011 GW90.00132 AU (197,000 km; 123,000 mi)1428.1[15]data · 2011 GW9
2011-04-062011-04-042011 GP280.00063 AU (94,000 km; 59,000 mi)729.4[16]data · 2011 GP28
2011-05-052011-05-082011 JV100.00231 AU (346,000 km; 215,000 mi)629.7[17]Yesdata · 2011 JV10
2011-06-022009-01-162009 BD0.00231325 AU (346,057 km; 215,030 mi)1428.1[18]data · 2009 BD
2011-06-272011-06-222011 MD0.00012467 AU (18,650 km; 11,589 mi)1428.0[19]data · 2011 MD
2011-07-242011-08-062011 PU10.00224 AU (335,000 km; 208,000 mi)6025.0[20]Yesdata · 2011 PU1
2011-07-282011-07-312011 OD180.00115 AU (172,000 km; 107,000 mi)3026.5[21]data · 2011 OD18
2011-09-272011-09-232011 SE580.00158 AU (236,000 km; 147,000 mi)1627.8[22]data · 2011 SE58
2011-09-282011-10-012011 TO0.00086 AU (129,000 km; 80,000 mi)3026.3[23]data · 2011 TO
2011-09-302011-09-292011 SM1730.00194 AU (290,000 km; 180,000 mi)1627.8[24]data · 2011 SM173
2011-10-122011-10-172011 UT0.0015 AU (220,000 km; 140,000 mi)3726.0[25]Yesdata · 2011 UT
2011-10-172009-10-152009 TM80.00219 AU (328,000 km; 204,000 mi)6–1228.4Yesdata · 2009 TM8
2011-10-262011-10-272011 UL1690.00177 AU (265,000 km; 165,000 mi)1328.3[26]data · 2011 UL169
2011-10-282011-10-302011 UX2550.00092 AU (138,000 km; 86,000 mi)1927.4[27]data · 2011 UX255
2011-11-082005-12-28(308635) 2005 YU550.00217202 AU (324,930 km; 201,902 mi)36021.9[28]Yesdata · 2005 YU55
2011-12-032011-12-082011 XC20.00232 AU (347,000 km; 216,000 mi)10023.1[29]Yesdata · 2011 XC2
2011-12-282011-12-292011 YC400.00071 AU (106,000 km; 66,000 mi)629.7[30]data · 2011 YC40
2011-12-292012-01-012012 AQ0.00179 AU (268,000 km; 166,000 mi)430.7[31]data · 2012 AQ
2011-12-302011-12-312011 YC630.00161 AU (241,000 km; 150,000 mi)929.0[32]data · 2011 YC63

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

Silhouette of man standing and facing forward

(size of a person for comparison)

After closest approach: 2 (50.0%)< 24 hours before: 1 (25.0%)up to 7 days before: 1 (25.0%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Abs Magnitude 29-30

After closest approach: 4 (80.0%)< 24 hours before: 0 (0.0%)up to 7 days before: 1 (20.0%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Absolute Magnitude 28-29

After closest approach: 3 (33.3%)< 24 hours before: 0 (0.0%)up to 7 days before: 5 (55.6%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 1 (11.1%)

Absolute Magnitude 27-28

After closest approach: 4 (66.7%)< 24 hours before: 0 (0.0%)up to 7 days before: 2 (33.3%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Absolute Magnitude 26-27

After closest approach: 4 (100.0%)< 24 hours before: 0 (0.0%)up to 7 days before: 0 (0.0%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Absolute Magnitude 25-26

After closest approach: 1 (100.0%)< 24 hours before: 0 (0.0%)up to 7 days before: 0 (0.0%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Absolute Magnitude less than 25 (largest)

After closest approach: 1 (50.0%)< 24 hours before: 0 (0.0%)up to 7 days before: 0 (0.0%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 1 (50.0%)

  •   After closest approach: 1 (50.0%)
  •   < 24 hours before: 0 (0.0%)
  •   up to 7 days before: 0 (0.0%)
  •   > one week before: 0 (0.0%)
  •   > 7 weeks before: 0 (0.0%)
  •   > one year before: 1 (50.0%)

See also

Notes
  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.

References
  1. "JPL Small-Body Database Browser". JPL Solar System Dynamics. NASA Jet Propulsion Laboratory.
  2. "MPC Database". IAU Minor Planet Center. International Astronomical Union. Retrieved 1 January 2021.
  3. "JPL Small-Body Database Browser: (2011 AM37)" (2011-01-14 last obs).
  4. "JPL Small-Body Database Browser: (2011 AN52)" (2011-01-17 last obs).
  5. "JPL Small-Body Database Browser: (2011 BY10)" (2011-01-30 last obs).
  6. "JPL Small-Body Database Browser: (2011 BW11)" (2011-01-28 last obs).
  7. "JPL Small-Body Database Browser: (2011 CA4)" (2011-02-10 last obs).
  8. "JPL Small-Body Database Browser: (2011 CQ1)" (2011-02-04 last obs).
  9. "JPL Small-Body Database Browser: (2011 CF22)" (2011-02-07 last obs).
  10. "JPL Small-Body Database Browser: (2011 CA7)" (2011-02-08 last obs).
  11. "JPL Small-Body Database Browser: (2011 DU9)" (2011-03-11 last obs).
  12. "JPL Small-Body Database Browser: (2011 EN11)" (2011-03-05 last obs).
  13. "JPL Small-Body Database Browser: (2011 EY11)" (2011-03-07 last obs).
  14. "JPL Small-Body Database Browser: (2011 EM40)" (2011-03-14 last obs).
  15. "JPL Small-Body Database Browser: (2011 GW9)" (2011-04-05 last obs).
  16. "JPL Small-Body Database Browser: (2011 GP28)" (2011-04-05 last obs).
  17. "JPL Small-Body Database Browser: (2011 JV10)" (2011-05-10 last obs).
  18. "JPL Small-Body Database Browser: (2009 BD)" (2011-06-20 last obs (arc=2.4 yr)).
  19. "JPL Small-Body Database Browser: (2011 MD)" (2011-07-03 last obs (arc=12 days)).
  20. "JPL Small-Body Database Browser: (2011 PU1)" (2011-09-21 last obs (arc=46 days)).
  21. "JPL Small-Body Database Browser: (2011 OD18)" (2011-08-08 last obs).
  22. "JPL Small-Body Database Browser: (2011 SE58)" (2011-09-27 last obs).
  23. "JPL Small-Body Database Browser: (2011 TO)" (2013-01-12 last obs (arc=1.28 yr)).
  24. "JPL Small-Body Database Browser: (2011 SM173)" (2011-09-30 last obs).
  25. "JPL Small-Body Database Browser: (2011 UT)" (2011-11-24 last obs (arc=38 days)).
  26. "JPL Small-Body Database Browser: (2011 UL169)" (2011-10-31 last obs).
  27. "JPL Small-Body Database Browser: (2011 UX255)" (2011-11-01 last obs).
  28. "JPL Small-Body Database Browser: (2005 YU55)" (2011-12-16 last obs).
  29. "JPL Small-Body Database Browser: (2011 XC2)" (2011-12-30 last obs (arc=22 days)).
  30. "JPL Small-Body Database Browser: (2011 YC40)" (2011-12-30 last obs).
  31. "JPL Small-Body Database Browser: (2012 AQ)" (2012-01-03 last obs).
  32. "JPL Small-Body Database Browser: (2011 YC63)" (2012-01-01 last obs).
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.