List of asteroid close approaches to Earth in 2014 explained

Time of discovery of asteroids which came closer to Earth than the Moon in 2014
Other Years Caption: Years Below: 2012, 2013, 2014, 2015, 2016

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

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.^[1]

For reference, the radius of Earth is approximately 4.26E-05abbr=onNaNabbr=on or 0.0166 Lunar distances.
The orbit of geosynchronous satellites, however, is 0.000282abbr=onNaNabbr=on 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).^[2]

Date of closest approach	Date discovered	width=60	Object	width=205 data-sort-type="number"	Nominal geocentric distance (AU)^[3]	data-sort-type="number"	Nominal geocentric distance (LD)	data-sort-type="number"	Size (m) (approx.)	data-sort-type="number"	(H) (abs. mag)	Closer approach to Moon	width=120	Refs^[4] ^[5]
2014-01-01	2014-01-02		0.00064abbr=onNaNabbr=on	0.25	5–10	28.8^[6]	Yes
2014-01-02	2014-01-01	2014 AA	3E-06abbr=onNaNabbr=on(Impact)^[7] ^[8]	0.001 (Impact)	2–4	30.9
2014-01-08	2014-01-10		0.00247abbr=onNaNabbr=on	0.96	15–30	26.6^[9]	Yes
2014-01-09	2014-01-10		0.000877abbr=onNaNabbr=on	0.34	2–5	29.9^[10]
2014-01-10	2014-01-10		0.00124abbr=onNaNabbr=on	0.48	10–20	27.2^[11]
2014-02-21	2014-02-22		0.00173abbr=onNaNabbr=on	0.67	7–16	27.8^[12]
2014-03-05	2014-02-28		0.00233abbr=onNaNabbr=on	0.91	20–40	25.7^[13]
2014-03-06	2014-03-05	2014 EF	0.00113abbr=onNaNabbr=on	0.44	4–9	29.0^[14]
2014-03-06	2014-03-05		0.000412abbr=onNaNabbr=on	0.16	6–14	28.2^[15]
2014-03-09	2014-03-11		0.00175abbr=onNaNabbr=on	0.68	5–11	28.7^[16]	Yes
2014-03-30	2014-04-04		0.00111abbr=onNaNabbr=on	0.43	20–50	25.4^[17]	Yes
2014-04-03	2014-04-04		0.000759abbr=onNaNabbr=on	0.30	5–11	28.6^[18]
2014-05-03	2014-04-28		0.00195abbr=onNaNabbr=on	0.76	6–14	28.0^[19]
2014-05-07	2014-05-06		0.000714abbr=onNaNabbr=on	0.28	3–8	29.3^[20]
2014-05-10	2014-05-10		0.000676abbr=onNaNabbr=on	0.26	3–8	29.2^[21]
2014-05-26	2014-05-28		0.0023abbr=onNaNabbr=on	0.89	6–14	28.0^[22]
2014-05-28	2014-05-27		0.00059abbr=onNaNabbr=on	0.23	3–8	29.4^[23]
2014-06-03	2014-06-05		0.00143abbr=onNaNabbr=on	0.54	10–20	27.2^[24]
2014-06-03	2014-06-02		0.000111abbr=onNaNabbr=on	0.043	4–8	29.1^[25]	?
2014-06-22	2014-06-24		0.00165abbr=onNaNabbr=on	0.64	10–23	27.0^[26]	Yes
2014-07-24	2014-07-25		0.00134abbr=onNaNabbr=on	0.52	4–9	29.0^[27]
2014-07-25	2014-07-26		0.0018abbr=onNaNabbr=on	0.70	4–9	29.0^[28]
2014-08-31	2014-09-01	2014 RA	0.000379abbr=onNaNabbr=on	0.15	5–10	28.8^[29]
2014-09-07	2014-09-01		0.000267abbr=onNaNabbr=on	0.10	11–25	26.8^[30]
2014-09-20	2014-09-20		0.000532abbr=onNaNabbr=on	0.21	4–9	29.0^[31]
2014-10-01	2014-10-02	2014 TL	0.000656abbr=onNaNabbr=on	0.26	8–17	27.6^[32]
2014-10-19	2014-10-24		0.00174abbr=onNaNabbr=on	0.66	7–15	28.0^[33]
2014-10-27	2014-10-25		0.0011abbr=onNaNabbr=on	0.43	8–19	27.4^[34]
2014-11-13	2014-11-17		0.00147abbr=onNaNabbr=on	0.57	2–5	30.3^[35]	Yes
2014-11-15	2014-11-17		0.00223abbr=onNaNabbr=on	0.86	9–23	27.1^[36]	Yes
2014-12-07	2014-11-24		0.00251abbr=onNaNabbr=on	0.98	3–7	29.4^[37]	Yes
2014-12-26	2014-12-27		0.00233abbr=onNaNabbr=on	0.91	16–35	26.1^[38]

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

Notes

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)^[39]	Nominal lunocentric distance (LD)	data-sort-type="number"	Size (m) (approximate)	(H)	approach distance to Earth (LD)
2014-01-01		0.000625abbr=onNaNabbr=on	0.24	4–12	28.8	0.25
2014-01-02		0.00238abbr=onNaNabbr=on	0.93^[40]	1–5	30.9^[41]	impact
2014-01-07		0.00142abbr=onNaNabbr=on	0.55	10–33	26.6	0.96
2014-01-08		0.00244abbr=onNaNabbr=on	0.95	7–23	27.4^[42]	1.50
2014-01-09		0.00238abbr=onNaNabbr=on	0.93	2–7	29.9	0.34
2014-01-10		0.00218abbr=onNaNabbr=on	0.85	7–22	27.5	0.48
2014-03-05		0.0025abbr=onNaNabbr=on	0.97	15–49	25.7	0.91
2014-03-06		0.00257abbr=onNaNabbr=on	0.9992	5–16	28.2	0.16
2014-03-09		0.00164abbr=onNaNabbr=on	0.64	4–13	28.6	0.68
2014-03-17	2014 FE	0.00232abbr=onNaNabbr=on	0.90	7–24	27.3^[43]	1.10
2014-03-29		0.00025abbr=onNaNabbr=on	0.097	18–57	25.4	0.43
2014-05-10		0.00216abbr=onNaNabbr=on	0.84	3–10	29.2	0.26
2014-05-28		0.00171abbr=onNaNabbr=on	0.67	3–9	29.3	0.23
2014-06-03		0.00201abbr=onNaNabbr=on	0.78	8–27	27.0	0.54
2014-06-04		0.00108abbr=onNaNabbr=on	0.42	3–10	29.1	0.043
2014-06-22		0.000956abbr=onNaNabbr=on	0.37	8–26	27.1	0.64
2014-08-31	2014 RA	0.00203abbr=onNaNabbr=on	0.79	4–11	28.9	0.15
2014-09-07		0.000845abbr=onNaNabbr=on	0.33	9–30	26.8	0.10
2014-09-20		0.00205abbr=onNaNabbr=on	0.80	3–10	29.1	0.21
2014-10-01	2014 TL	0.00191abbr=onNaNabbr=on	0.74	6–19	27.8	0.26
2014-10-27		0.00137abbr=onNaNabbr=on	0.53	7–23	27.4	0.43
2014-11-13		0.00122abbr=onNaNabbr=on	0.48	2–6	30.4	0.57
2014-11-15		0.00181abbr=onNaNabbr=on	0.70	8–26	27.1	0.86
2014-12-04		0.00148abbr=onNaNabbr=on	0.58	3–8	29.6	0.98

Notes

Additional examples

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.

• (~300 meters in diameter) passed 6.2 lunar distances from Earth on 10 February 2014.
• (~200 meters in diameter) passed more than 0.018abbr=onNaNabbr=on from Earth on 17–18 February 2014.
• (~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).
• (~25 meters in diameter) passed 1.1 lunar distances from Earth on 3 June 2014.^[44]
• (~325 meters in diameter) passed 3.25 lunar distances from Earth on 8 June 2014.
• (~75 meters in diameter) passed 0.0297abbr=onNaNabbr=on from Earth on 18 August 2014.
• (~230 meters in diameter) passed roughly 0.26abbr=onNaNabbr=on 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 0.1abbr=onNaNabbr=on from Earth.^[45]
• (~10 meters in diameter) passed 1.1 lunar distances from Earth on 23 September 2014.^[46]
• (~60 meters in diameter) passed 1.5 lunar distances from Earth on 24 October 2014.^[47]

See also

• List of asteroid close approaches to Earth
• List of asteroid close approaches to Earth in 2013
• List of asteroid close approaches to Earth in 2015

Notes and References

1. For a list of current Earth close approaches see NEO Earth Close Approaches
2. Web site: Fireballs.
3. 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.
4. Web site: JPL Small-Body Database Browser . 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: (2014 AF5) . last observation: 2014-01-03 . 2014-01-06.
7. The trajectory and atmospheric impact of asteroid 2014 AA. Davide. Farnocchia. Steven R.. Chesley. Peter G.. Brown. Paul W.. Chodas. 1 August 2016. Icarus. 274. 327–333. 2016Icar..274..327F. 10.1016/j.icarus.2016.02.056 .
8. Homing in for New Year: impact parameters and pre-impact orbital evolution of meteoroid 2014 AA. C.. de la Fuente Marcos. R.. de la Fuente Marcos. P.. Mialle. 13 October 2016. Astrophysics and Space Science. 361. 11. 358 (33 pp.). 1610.01055. 2016Ap&SS.361..358D . 10.1007/s10509-016-2945-3.
9. Web site: JPL Small-Body Database Browser: (2014 AK51) . last observation: 2014-01-13.
10. Web site: JPL Small-Body Database Browser: (2014 AG51) . last observation: 2014-01-11.
11. Web site: JPL Small-Body Database Browser: (2014 AW32) . last observation: 2014-01-11.
12. Web site: JPL Small-Body Database Browser: (2014 DK10) . last observation: 2014-02-24.
13. Web site: JPL Small-Body Database Browser: (2014 DX110) . last observation: 2014-03-05.
14. Web site: JPL Small-Body Database Browser: (2014 EF) . last observation: 2014-03-05.
15. Web site: JPL Small-Body Database Browser: (2014 EC) . last observation: 2014-03-05.
16. Web site: JPL Small-Body Database Browser: (2014 EX24) . last observation: 2014-03-12.
17. Web site: JPL Small-Body Database Browser: (2014 GY44) . last observation: 2014-04-09.
18. Web site: JPL Small-Body Database Browser: (2014 GC49) . last observation: 2014-04-05.
19. Web site: JPL Small-Body Database Browser: (2014 HL129) . last observation: 2014-04-29.
20. Web site: JPL Small-Body Database Browser: (2014 JR24) . last observation: 2014-05-07.
21. Web site: JPL Small-Body Database Browser: (2014 JG55) . last observation: 2014-05-10.
22. Web site: JPL Small-Body Database Browser: (2014 KW76) . last observation: 2014-05-30.
23. Web site: JPL Small-Body Database Browser: (2014 KC45) . last observation: 2014-05-28.
24. Web site: JPL Small-Body Database Browser: (2014 LN17) . last observation: 2014-06-07.
25. Web site: JPL Small-Body Database Browser: (2014 LY21) . last observation: 2014-06-02.
26. Web site: JPL Small-Body Database Browser: (2014 MH6) . last observation: 2014-06-25.
27. Web site: JPL Small-Body Database Browser: (2014 OP2) . last observation: 2014-06-28.
28. Web site: JPL Small-Body Database Browser: (2014 OM207) . last observation: 2014-06-29.
29. Web site: JPL Small-Body Database Browser: (2014 RA) . last observation: 2014-09-02.
30. Web site: JPL Small-Body Database Browser: (2014 RC) . last observation: 2014-09-07.
31. Web site: JPL Small-Body Database Browser: (2014 SG1) . last observation: 2014-09-20.
32. Web site: JPL Small-Body Database Browser: (2014 TL) . last observation: 2014-10-02.
33. Web site: JPL Small-Body Database Browser: (2014 UU56) . last observation: 2014-10-26.
34. Web site: JPL Small-Body Database Browser: (2014 UF56) . last observation: 2014-10-26.
35. Web site: JPL Small-Body Database Browser: (2014 WE6) . last observation: 2014-11-21.
36. Web site: JPL Small-Body Database Browser: (2014 WJ6) . last observation: 2014-11-19.
37. Web site: JPL Small-Body Database Browser: (2014 WX202) . last observation: 2014-11-26.
38. Web site: JPL Small-Body Database Browser: (2014 YR14) . last observation: 2014-12-27.
39. Distance from the center of the Moon to the center of the object. the Moon has a radius of approximately 1,740 km.
40. if 2014 AA had not hit Earth, it would have traveled much closer to the Moon
41. Web site: JPL Small-Body Database Browser: (2014 AA) . last observation: 2014-01-02.
42. Web site: JPL Small-Body Database Browser: (2014 AD16) . last observation: 2014-01-06.
43. Web site: JPL Small-Body Database Browser: (2014 FE) . last observation: 2014-03-24.
44. http://www.universetoday.com/112296/asteroid-2014-kh39-zips-just-1-1-ld-from-earth-watch-it-live-june-3/ B. King - Asteroid 2014 KH39 Zips Just 1.1 LD from Earth - Universe Today
45. Web site: JPL Small-Body Database Browser: (2009 RR) . last observation: 2009-09-15; arc: 4 days.
46. Web site: JPL Small-Body Database Browser: (2014 SN142) . last observation: 2014-09-22.
47. Web site: JPL Small-Body Database Browser: (2014 SC324) . last observation: 2014-10-24.