List of asteroid close approaches to Earth in 2014

Below is the list of asteroid close approaches to Earth in 2014.

Time of discovery of asteroids which came closer to Earth than the Moon in 2014

After closest approach: 18 (56.2%)< 24 hours before: 5 (15.6%)up to 7 days before: 8 (25.0%)> one week before: 1 (3.1%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

  •   After closest approach: 18 (56.2%)
  •   < 24 hours before: 5 (15.6%)
  •   up to 7 days before: 8 (25.0%)
  •   > one week before: 1 (3.1%)
  •   > 7 weeks before: 0 (0.0%)
  •   > one year before: 0 (0.0%)

Timeline of known close approaches less than one lunar distance from Earth in 2014

A list of known near-Earth asteroid close approaches less than 1 lunar distance (384,400 km or 0.00256 AU) from Earth in 2014.[note 1]

For reference, the radius of Earth is approximately 0.0000426 AU (6,370 km; 3,960 mi) or 0.0166 Lunar distances.
The orbit of geosynchronous satellites, however, is 0.000282 AU (42,200 km; 26,200 mi) or 0.110 Lunar distances. This year, 3 asteroids were detected which traveled nearer than this, most notably 2014 AA, which impacted. This list does not include any of the other 32 objects that collided with earth in 2014, none of which were discovered in advance, but were recorded by sensors designed to detect detonation of nuclear devices (of the 33 objects detected 5 had an impact energy greater than that of a 1 kiloton device).[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)

Date of
closest
approach		 Date
discovered		 Object Nominal geocentric
distance (AU)[note 2]		 Nominal geocentric
distance (LD)		 Size (m)
(approx.)		 (H)
(abs. mag)		 Closer
approach
to Moon		 Refs[2][3]
2014-01-012014-01-022014 AF50.00064 AU (96,000 km; 59,000 mi)0.255–1028.8[4]Yesdata · 2014 AF5
2014-01-022014-01-012014 AA0.000003 AU (450 km; 280 mi)(Impact)[5][6]0.001 (Impact)2–430.9data · 2014 AA
2014-01-082014-01-102014 AK510.00247 AU (370,000 km; 230,000 mi)0.9615–3026.6[7]Yesdata · 2014 AK51
2014-01-092014-01-102014 AG510.000877 AU (131,200 km; 81,500 mi)0.342–529.9[8]data · 2014 AG51
2014-01-102014-01-102014 AW320.00124 AU (186,000 km; 115,000 mi)0.4810–2027.2[9]data · 2014 AW32
2014-02-212014-02-222014 DK100.00173 AU (259,000 km; 161,000 mi)0.677–1627.8[10]data · 2014 DK10
2014-03-052014-02-282014 DX1100.00233 AU (349,000 km; 217,000 mi)0.9120–4025.7[11]data · 2014 DX110
2014-03-062014-03-052014 EF0.00113 AU (169,000 km; 105,000 mi)0.444–929.0[12]data · 2014 EF
2014-03-062014-03-052014 EC0.000412 AU (61,600 km; 38,300 mi)0.166–1428.2[13]data · 2014 EC
2014-03-092014-03-112014 EX240.00175 AU (262,000 km; 163,000 mi)0.685–1128.7[14]Yesdata · 2014 EX24
2014-03-302014-04-042014 GY440.00111 AU (166,000 km; 103,000 mi)0.4320–5025.4[15]Yesdata · 2014 GY44
2014-04-032014-04-042014 GC490.000759 AU (113,500 km; 70,600 mi)0.305–1128.6[16]data · 2014 GC49
2014-05-032014-04-282014 HL1290.00195 AU (292,000 km; 181,000 mi)0.766–1428.0[17]data · 2014 HL129
2014-05-072014-05-062014 JR240.000714 AU (106,800 km; 66,400 mi)0.283–829.3[18]data · 2014 JR24
2014-05-102014-05-102014 JG550.000676 AU (101,100 km; 62,800 mi)0.263–829.2[19]data · 2014 JG55
2014-05-262014-05-282014 KW760.00230 AU (344,000 km; 214,000 mi)0.896–1428.0[20]data · 2014 KW76
2014-05-282014-05-272014 KC450.000590 AU (88,300 km; 54,800 mi)0.233–829.4[21]data · 2014 KC45
2014-06-032014-06-052014 LN170.00143 AU (214,000 km; 133,000 mi)0.5410–2027.2[22]data · 2014 LN17
2014-06-032014-06-022014 LY210.000111 AU (16,600 km; 10,300 mi)0.0434–829.1[23]?data · 2014 LY21
2014-06-222014-06-242014 MH60.00165 AU (247,000 km; 153,000 mi)0.6410–2327.0[24]Yesdata · 2014 MH6
2014-07-242014-07-252014 OP20.00134 AU (200,000 km; 125,000 mi)0.524–929.0[25]data · 2014 OP2
2014-07-252014-07-262014 OM2070.00180 AU (269,000 km; 167,000 mi)0.704–929.0[26]data · 2014 OM207
2014-08-312014-09-012014 RA0.000379 AU (56,700 km; 35,200 mi)0.155–1028.8[27]data · 2014 RA
2014-09-072014-09-012014 RC0.000267 AU (39,900 km; 24,800 mi)0.1011–2526.8[28]data · 2014 RC
2014-09-202014-09-202014 SG10.000532 AU (79,600 km; 49,500 mi)0.214–929.0[29]data · 2014 SG1
2014-10-012014-10-022014 TL0.000656 AU (98,100 km; 61,000 mi)0.268–1727.6[30]data · 2014 TL
2014-10-192014-10-242014 UU560.00174 AU (260,000 km; 162,000 mi)0.667–1528.0[31]data · 2014 UU56
2014-10-272014-10-252014 UF560.00110 AU (165,000 km; 102,000 mi)0.438–1927.4[32]data · 2014 UF56
2014-11-132014-11-172014 WE60.00147 AU (220,000 km; 137,000 mi)0.572–530.3[33]Yesdata · 2014 WE6
2014-11-152014-11-172014 WJ60.00223 AU (334,000 km; 207,000 mi)0.869–2327.1[34]Yesdata · 2014 WJ6
2014-12-072014-11-242014 WX2020.00251 AU (375,000 km; 233,000 mi)0.983–729.4[35]Yesdata · 2014 WX202
2014-12-262014-12-272014 YR140.00233 AU (349,000 km; 217,000 mi)0.9116–3526.1[36]data · 2014 YR14

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: 1 (50.0%)< 24 hours before: 1 (50.0%)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%)

Abs Magnitude 29-30

After closest approach: 3 (30.0%)< 24 hours before: 3 (30.0%)up to 7 days before: 3 (30.0%)> one week before: 1 (10.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Absolute Magnitude 28-29

After closest approach: 6 (75.0%)< 24 hours before: 0 (0.0%)up to 7 days before: 2 (25.0%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Absolute Magnitude 27-28

After closest approach: 5 (71.4%)< 24 hours before: 1 (14.3%)up to 7 days before: 1 (14.3%)> 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: 2 (66.7%)< 24 hours before: 0 (0.0%)up to 7 days before: 1 (33.3%)> 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 (50.0%)< 24 hours before: 0 (0.0%)up to 7 days before: 1 (50.0%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

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.

Timeline of close approaches less than one Lunar distance from the Moon in 2014

The number of asteroids listed here are significantly less than those of asteroids approaching Earth for several reasons:

  • Asteroids approaching Earth not only move faster, but are brighter and are easier to detect with modern surveys due to these factors
  • Asteroids approaching closer to Earth are higher priority to confirm, and only confirmed asteroids are listed with a lunocentric approach distance
  • Those which make close approaches to the Moon are frequently lost in its glare, making them harder to confirm, and are more easily discovered during the new Moon, when the Moon is too close to the Sun for any asteroids to be detected while they are near to the Moon anyway.

These factors combined severely limit the amount of Moon-approaching asteroids, to a level many times lower than the detected asteroids to pass just as close to Earth instead.

Date of
closest
approach		 Object Nominal lunocentric
distance (AU)[note2 1]		 Nominal lunocentric
distance (LD)		 Size (m)
(approximate)		 (H)
approach
distance
to Earth
(LD)
2014-01-012014 AF50.000625 AU (93,500 km; 58,100 mi)0.244–1228.8[4]0.25
2014-01-022014 AA0.00238 AU (356,000 km; 221,000 mi)0.93[note2 2]1–530.9[37]impact
2014-01-072014 AK510.00142 AU (212,000 km; 132,000 mi)0.5510–3326.6[7]0.96
2014-01-082014 AD160.00244 AU (365,000 km; 227,000 mi)0.957–2327.4[38]1.50
2014-01-092014 AG510.00238 AU (356,000 km; 221,000 mi)0.932–729.9[8]0.34
2014-01-102014 AW320.00218 AU (326,000 km; 203,000 mi)0.857–2227.5[9]0.48
2014-03-052014 DX1100.00250 AU (374,000 km; 232,000 mi)0.9715–4925.7[11]0.91
2014-03-062014 EC0.00257 AU (384,000 km; 239,000 mi)0.99925–1628.2[13]0.16
2014-03-092014 EX240.00164 AU (245,000 km; 152,000 mi)0.644–1328.6[14]0.68
2014-03-172014 FE0.00232 AU (347,000 km; 216,000 mi)0.907–2427.3[39]1.10
2014-03-292014 GY440.000250 AU (37,400 km; 23,200 mi)0.09718–5725.4[15]0.43
2014-05-102014 JG550.00216 AU (323,000 km; 201,000 mi)0.843–1029.2[19]0.26
2014-05-282014 KC450.00171 AU (256,000 km; 159,000 mi)0.673–929.3[21]0.23
2014-06-032014 LN170.00201 AU (301,000 km; 187,000 mi)0.788–2727.0[22]0.54
2014-06-042014 LY210.00108 AU (162,000 km; 100,000 mi)0.423–1029.1[23]0.043
2014-06-222014 MH60.000956 AU (143,000 km; 88,900 mi)0.378–2627.1[24]0.64
2014-08-312014 RA0.00203 AU (304,000 km; 189,000 mi)0.794–1128.9[27]0.15
2014-09-072014 RC0.000845 AU (126,400 km; 78,500 mi)0.339–3026.8[28]0.10
2014-09-202014 SG10.00205 AU (307,000 km; 191,000 mi)0.803–1029.1[29]0.21
2014-10-012014 TL0.00191 AU (286,000 km; 178,000 mi)0.746–1927.8[30]0.26
2014-10-272014 UF560.00137 AU (205,000 km; 127,000 mi)0.537–2327.4[32]0.43
2014-11-132014 WE60.00122 AU (183,000 km; 113,000 mi)0.482–630.4[33]0.57
2014-11-152014 WJ60.00181 AU (271,000 km; 168,000 mi)0.708–2627.1[34]0.86
2014-12-042014 WX2020.00148 AU (221,000 km; 138,000 mi)0.583–829.6[35]0.98

Notes
  1. Distance from the center of the Moon to the center of the object. the Moon has a radius of approximately 1,740 km.
  2. if 2014 AA had not hit Earth, it would have traveled much closer to the Moon

Additional examples
Radar-imaging of 2006 DP14, which passed by Earth in early February 2014 at a distance of 6.25 LD

An example list of near-Earth asteroids that passed more than 1 lunar distance (384,400 km or 0.00256 AU) from Earth in 2014.

  • (388188) 2006 DP14 (~300 meters in diameter) passed 6.2 lunar distances from Earth on 10 February 2014.
  • 2000 EM26 (~200 meters in diameter) passed more than 0.018 AU (2,700,000 km; 1,700,000 mi) from Earth on 17–18 February 2014.
  • 2014 HJ197 (~3 meters in diameter) may have passed as close as 0.97 lunar distances (371,000 km) from Earth (0.68 lunar distances (261,000 km) from the Moon on either April 14 or 15th, 2014, but the nominal orbit calculates an approach of 1.29 lunar distances (495,000 km) from Earth (1.23 lunar distances (473,000 km) from the Moon).
  • 2014 KH39 (~25 meters in diameter) passed 1.1 lunar distances from Earth on 3 June 2014.[40]
  • 2014 HQ124 (~325 meters in diameter) passed 3.25 lunar distances from Earth on 8 June 2014.
  • 2014 OO6 (~75 meters in diameter) passed 0.0297 AU (4,440,000 km; 2,760,000 mi) from Earth on 18 August 2014.
  • 2014 XL7 (~230 meters in diameter) passed roughly 0.26 AU (39,000,000 km; 24,000,000 mi) from Earth on 1 September 2014.
  • The orbit of 2009 RR (20–45 meters in diameter) with an observation arc of only 4 days predicted that it could pass just inside 1 lunar distance on 2014-09-16, but the orbital uncertainties show that it could have passed as much as 0.1 AU (15,000,000 km; 9,300,000 mi) from Earth.[41]
  • 2014 SN142 (~10 meters in diameter) passed 1.1 lunar distances from Earth on 23 September 2014.[42]
  • 2014 SC324 (~60 meters in diameter) passed 1.5 lunar distances from Earth on 24 October 2014.[43]

See also

References
  1. "Fireballs".
  2. "JPL Small-Body Database Browser". JPL Solar System Dynamics. NASA Jet Propulsion Laboratory.
  3. "MPC Database". IAU Minor Planet Center. International Astronomical Union. Retrieved 1 January 2021.
  4. "JPL Small-Body Database Browser: (2014 AF5)" (last observation: 2014-01-03). Retrieved 2014-01-06.
  5. Farnocchia, Davide; Chesley, Steven R.; Brown, Peter G.; Chodas, Paul W. (1 August 2016). "The trajectory and atmospheric impact of asteroid 2014 AA". Icarus. 274: 327–333. Bibcode:2016Icar..274..327F. doi:10.1016/j.icarus.2016.02.056.
  6. de la Fuente Marcos, C.; de la Fuente Marcos, R.; Mialle, P. (13 October 2016). "Homing in for New Year: impact parameters and pre-impact orbital evolution of meteoroid 2014 AA". Astrophysics and Space Science. 361 (11): 358 (33 pp.). arXiv:1610.01055. Bibcode:2016Ap&SS.361..358D. doi:10.1007/s10509-016-2945-3.
  7. "JPL Small-Body Database Browser: (2014 AK51)" (last observation: 2014-01-13).
  8. "JPL Small-Body Database Browser: (2014 AG51)" (last observation: 2014-01-11).
  9. "JPL Small-Body Database Browser: (2014 AW32)" (last observation: 2014-01-11).
  10. "JPL Small-Body Database Browser: (2014 DK10)" (last observation: 2014-02-24).
  11. "JPL Small-Body Database Browser: (2014 DX110)" (last observation: 2014-03-05).
  12. "JPL Small-Body Database Browser: (2014 EF)" (last observation: 2014-03-05).
  13. "JPL Small-Body Database Browser: (2014 EC)" (last observation: 2014-03-05).
  14. "JPL Small-Body Database Browser: (2014 EX24)" (last observation: 2014-03-12).
  15. "JPL Small-Body Database Browser: (2014 GY44)" (last observation: 2014-04-09).
  16. "JPL Small-Body Database Browser: (2014 GC49)" (last observation: 2014-04-05).
  17. "JPL Small-Body Database Browser: (2014 HL129)" (last observation: 2014-04-29).
  18. "JPL Small-Body Database Browser: (2014 JR24)" (last observation: 2014-05-07).
  19. "JPL Small-Body Database Browser: (2014 JG55)" (last observation: 2014-05-10).
  20. "JPL Small-Body Database Browser: (2014 KW76)" (last observation: 2014-05-30).
  21. "JPL Small-Body Database Browser: (2014 KC45)" (last observation: 2014-05-28).
  22. "JPL Small-Body Database Browser: (2014 LN17)" (last observation: 2014-06-07).
  23. "JPL Small-Body Database Browser: (2014 LY21)" (last observation: 2014-06-02).
  24. "JPL Small-Body Database Browser: (2014 MH6)" (last observation: 2014-06-25).
  25. "JPL Small-Body Database Browser: (2014 OP2)" (last observation: 2014-06-28).
  26. "JPL Small-Body Database Browser: (2014 OM207)" (last observation: 2014-06-29).
  27. "JPL Small-Body Database Browser: (2014 RA)" (last observation: 2014-09-02).
  28. "JPL Small-Body Database Browser: (2014 RC)" (last observation: 2014-09-07).
  29. "JPL Small-Body Database Browser: (2014 SG1)" (last observation: 2014-09-20).
  30. "JPL Small-Body Database Browser: (2014 TL)" (last observation: 2014-10-02).
  31. "JPL Small-Body Database Browser: (2014 UU56)" (last observation: 2014-10-26).
  32. "JPL Small-Body Database Browser: (2014 UF56)" (last observation: 2014-10-26).
  33. "JPL Small-Body Database Browser: (2014 WE6)" (last observation: 2014-11-21).
  34. "JPL Small-Body Database Browser: (2014 WJ6)" (last observation: 2014-11-19).
  35. "JPL Small-Body Database Browser: (2014 WX202)" (last observation: 2014-11-26).
  36. "JPL Small-Body Database Browser: (2014 YR14)" (last observation: 2014-12-27).
  37. "JPL Small-Body Database Browser: (2014 AA)" (last observation: 2014-01-02).
  38. "JPL Small-Body Database Browser: (2014 AD16)" (last observation: 2014-01-06).
  39. "JPL Small-Body Database Browser: (2014 FE)" (last observation: 2014-03-24).
  40. B. King - Asteroid 2014 KH39 Zips Just 1.1 LD from Earth - Universe Today
  41. "JPL Small-Body Database Browser: (2009 RR)" (last observation: 2009-09-15; arc: 4 days).
  42. "JPL Small-Body Database Browser: (2014 SN142)" (last observation: 2014-09-22).
  43. "JPL Small-Body Database Browser: (2014 SC324)" (last observation: 2014-10-24).
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