List of asteroid close approaches to Earth in 2018

Last updated

Time of discovery of asteroids which came closer to Earth than the Moon in 2018
Circle frame.svgAfter closest approach: 54 (58.1%)< 24 hours before: 11 (11.8%)up to 7 days before: 26 (28.0%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 2 (2.2%)
  •   After closest approach: 54 (58.1%)
  •   < 24 hours before: 11 (11.8%)
  •   up to 7 days before: 26 (28.0%)
  •   > one week before: 0 (0.0%)
  •   > 7 weeks before: 0 (0.0%)
  •   > one year before: 2 (2.2%)
Simulated animation of 2017 YE5, a binary system asteroid, which came within 15.5 lunar distances in June 2019 PIA22556-BinaryAsteroid-2017-YE5-Animation-20180712.gif
Simulated animation of 2017 YE5 , a binary system asteroid, which came within 15.5 lunar distances in June 2019

Below is the list of asteroid close approaches to Earth in 2018.

Contents

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

A list of known near-Earth asteroid close approaches less than 1 lunar distance (0.0025696 AU (384,410 km; 238,860 mi)) from Earth in 2018. [note 1]

For reference, the radius of Earth is approximately 0.0000426 AU (6,370 km; 3,960 mi) or 0.0166 lunar distances.
Geosynchronous satellites have an orbit with semi-major axis length of 0.000282 AU (42,200 km; 26,200 mi) or 0.110 lunar distances. Eight known asteroids (2018 BD, A106fgF, 2018 LA, A107j4q, 2018 PD20 , 2018 UA, 2018 WG, and 2018 WV1 ) are confirmed to have passed within this distance, and poorly-observed asteroids ZB0A262, 2018 DN4, ZGBE54F, A1080DC 2018 VQ10, ZW87F01, and ZW900BE may have also passed within this distance. While most asteroids on this list are confirmed, well-observed unconfirmed objects with a 50% or greater chance of passing within 1 LD of the Earth are included as well.

The largest asteroid to pass within 1 LD of Earth in 2018 was 2018 AH with an estimated diameter of around 137 meters and an absolute magnitude of 22.5. The fastest asteroid to pass within 1 LD of Earth in 2018 was 2018 GE3 that passed Earth with a velocity with respect to Earth of 29.6 km/s (66,000 mph). [1] [note 2]

  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 3] 		Nominal geocentric
distance (LD)		Size (m)
(approximate)		(H)
(abs. mag)		Closer
approach
to Moon 		Refs [2] [3]
2018-01-022018-01-04 2018 AH 0.00199  AU (298,000  km ; 185,000  mi )0.77 [note 4] 84–19022.5— data  · 2018 AH
2018-01-152018-01-172018 BW0.00112 AU (168,000 km; 104,000 mi)0.436–1428.1— data  · 2018 BW
2018-01-162018-01-172018 BR10.000877 AU (131,200 km; 81,500 mi)0.343–829.5— data  · 2018 BR1
2018-01-182018-01-18 2018 BD 0.000262 AU (39,200 km; 24,400 mi)0.102–630.1— data  · 2018 BD
2018-01-192018-01-20 2018 BF3 0.00162 AU (242,000 km; 151,000 mi)0.6317–3826.0— data  · 2018 BF3
2018-01-192018-01-172018 BC0.00189 AU (283,000 km; 176,000 mi)0.733–929.4— data  · 2018 BC
2018-01-192018-01-182018 BX0.00188 AU (281,000 km; 175,000 mi)0.734–929.1— data  · 2018 BX
2018-01-202018-01-242018 BL110.00203 AU (304,000 km; 189,000 mi)0.795–1328.3✓ data  · 2018 BL11
2018-01-222018-01-22A106fgFPotential Impact?0.0011 [note 5] 2–530.6— Src
2018-01-242018-01-272018 BN60.00242 AU (362,000 km; 225,000 mi)0.9412–2626.8— data  · 2018 BN6
2018-01-252018-01-26ZB0A2620.000401 AU (60,000 km; 37,300 mi)0.16 [note 6] 2–530.6— Src
2018-02-042018-02-072018 CS10.00230 AU (344,000 km; 214,000 mi)0.906–1428.2— data  · 2018 CS1
2018-02-062018-02-07 2018 CF2 0.000650 AU (97,200 km; 60,400 mi)0.256–1528.0— data  · 2018 CF2
2018-02-062018-02-04 2018 CC 0.00126 AU (188,000 km; 117,000 mi)0.4913–2826.6— data  · 2018 CC
2018-02-092018-02-08 2018 CN2 0.000467 AU (69,900 km; 43,400 mi)0.187–1627.8— data  · 2018 CN2
2018-02-092018-02-04 2018 CB 0.000466 AU (69,700 km; 43,300 mi)0.1818–3925.9— data  · 2018 CB
2018-02-162018-02-102018 CD30.00237 AU (355,000 km; 220,000 mi)0.925–1128.6— data  · 2018 CD3
2018-02-212018-02-222018 DQ0.000670 AU (100,200 km; 62,300 mi)0.264–929.1— data  · 2018 DQ
2018-02-242018-02-262018 DN40.00141 AU (211,000 km; 131,000 mi)0.55 [note 7] 5–1228.4 ? data  · 2018 DN4
2018-02-252018-02-232018 DU0.00190 AU (284,000 km; 177,000 mi)0.745–1328.3— data  · 2018 DU
2018-03-022018-02-26 2018 DV1 0.000748 AU (111,900 km; 69,500 mi)0.295–1228.4— data  · 2018 DV1
2018-03-142018-03-122018 EZ20.00144 AU (215,000 km; 134,000 mi)0.5613–2826.6✓ data  · 2018 EZ2
2018-03-172018-03-192018 FL290.00148 AU (221,000 km; 138,000 mi)0.582–630.1— data  · 2018 FL29
2018-03-182018-03-212018 FE30.000979 AU (146,500 km; 91,000 mi)0.389–2227.2— data  · 2018 FE3
2018-03-192018-03-202018 FQ30.00187 AU (280,000 km; 174,000 mi)0.735–1128.6— data  · 2018 FQ3
2018-03-232018-03-212018 FZ30.00129 AU (193,000 km; 120,000 mi)0.508–1827.6— data  · 2018 FZ3
2018-03-302018-03-282018 FK50.00100 AU (150,000 km; 93,000 mi)0.395–1328.3— data  · 2018 FK5
2018-04-072018-04-112018 GR110.00177 AU (265,000 km; 165,000 mi)0.696–1228.5— data  · 2018 GR11
2018-04-102008-04-132008 GY21 aka
2018 GY3		0.00201 AU (301,000 km; 187,000 mi)0.788–1827.6— data  · 2008 GY21
2018-04-122018-04-13ZGBE54F0.000469 AU (70,200 km; 43,600 mi)0.18 [note 8] 2–730.0— Src
2018-04-122018-04-112018 GD20.00201 AU (301,000 km; 187,000 mi)0.783–829.4— data  · 2018 GD2
2018-04-152018-04-14 2018 GE3 0.00129 AU (193,000 km; 120,000 mi)0.5046–10023.8✓ data  · 2018 GE3
2018-04-212018-04-232018 HW10.00229 AU (343,000 km; 213,000 mi)0.8918–4125.8— data  · 2018 HW1
2018-04-222018-04-212018 HV0.00103 AU (154,000 km; 96,000 mi)0.404–1028.9— data  · 2018 HV
2018-05-152010-11-30 2010 WC9 0.00136 AU (203,000 km; 126,000 mi)0.5351–11023.6— data  · 2010 WC9
2018-05-232018-05-222018 KW10.000997 AU (149,100 km; 92,700 mi)0.393–729.7— data  · 2018 KW1
2018-05-262018-05-242018 KY20.00200 AU (299,000 km; 186,000 mi)0.789–2227.2— data  · 2018 KY2
2018-06-022018-06-02 2018 LA 0.0000334 AU (5,000 km; 3,100 mi)
(Impact)		0.0130
(Impact) [note 9] 		2–330.5— data  · 2018 LA
2018-06-152018-06-112018 LV30.00221 AU (331,000 km; 205,000 mi)0.8613–3026.5— data  · 2018 LV3
2018-06-162018-06-172018 MZ40.00139 AU (208,000 km; 129,000 mi)0.544–1028.8✓ data  · 2018 MZ4
2018-06-172018-06-17A107j4q0.000206 AU (30,800 km; 19,100 mi)0.080 [note 10] 4–1128.9— Src  · diagram
2018-06-232018-06-24A107pL20.000525 AU (78,500 km; 48,800 mi)0.20 [note 11] 3–929.5— Src
2018-07-042018-07-05ZN2E0900.00132 AU (197,000 km; 123,000 mi)0.51 [note 12] 4–1228.8— Src
2018-07-072018-07-082018 NX0.000783 AU (117,100 km; 72,800 mi)0.307–1727.7— data  · 2018 NX
2018-07-082018-07-082018 NW0.000833 AU (124,600 km; 77,400 mi)0.327–1627.8— data  · 2018 NW
2018-08-102018-08-11 2018 PD20 0.000224 AU (33,500 km; 20,800 mi)0.0878–2027.4— data  · 2018 PD20
2018-08-122018-08-13A1080DC0.000284 AU (42,500 km; 26,400 mi)0.11 [note 13] 1–431.3— Src
2018-08-212018-08-212018 QR10.000592 AU (88,600 km; 55,000 mi)0.238–2027.4— data  · 2018 QR1
2018-09-032018-09-072018 RR10.00243 AU (364,000 km; 226,000 mi)0.942–629.9— data  · 2018 RR1
2018-09-052018-09-062018 RS0.000710 AU (106,200 km; 66,000 mi)0.282–930.0— data  · 2018 RS
2018-09-062018-09-072018 RE20.00255 AU (381,000 km; 237,000 mi)0.9915–1228.5— data  · 2018 RE2
2018-09-072018-09-092018 RJ30.00112 AU (168,000 km; 104,000 mi)0.447–1627.8— data  · 2018 RJ3
2018-09-082018-09-072018 RW0.00114 AU (171,000 km; 106,000 mi)0.442–530.3— data  · 2018 RW
2018-09-092018-09-032018 RC0.00150 AU (224,000 km; 139,000 mi)0.5828–6324.9— data  · 2018 RC
2018-09-122018-09-132018 RY50.00120 AU (180,000 km; 112,000 mi)0.4710–3626.5— data  · 2018 RY5
2018-09-122018-09-132018 RZ50.000331 AU (49,500 km; 30,800 mi)0.132–829.7— data  · 2018 RZ5
2018-09-152018-09-162018 SM0.000285 AU (42,600 km; 26,500 mi)0.113–929.4— data  · 2018 SM
2018-09-162018-09-182018 SN30.00131 AU (196,000 km; 122,000 mi)0.512–729.9— data  · 2018 SN3
2018-09-182018-09-172018 SC0.00179 AU (268,000 km; 166,000 mi)0.705–1927.9— data  · 2018 SC
2018-09-252018-09-212018 SD20.000587 AU (87,800 km; 54,600 mi)0.234–1228.6— data  · 2018 SD2
2018-09-302018-10-022018 TC0.00204 AU (305,000 km; 190,000 mi)0.7910–3126.6— data  · 2018 TC
2018-10-062018-10-052018 TV50.000682 AU (102,000 km; 63,400 mi)0.273–929.5— data  · 2018 TV5
2018-10-062018-10-06ZTF01Z90.00170 AU (254,000 km; 158,000 mi)0.66 [note 14] 4–1228.8— Src
2018-10-072018-10-052018 TV0.00190 AU (284,000 km; 177,000 mi)0.744–1328.6— data  · 2018 TV
2018-10-172018-10-182018 UL0.00148 AU (221,000 km; 138,000 mi)0.573–1129.1✓ data  · 2018 UL
2018-10-192018-10-19 2018 UA 0.0000914 AU (13,670 km; 8,500 mi)0.0362–630.2— data  · 2018 UA
2018-11-012018-11-012018 VQ100.000276 AU (41,300 km; 25,700 mi)0.11 [note 15] 2–530.6— Temp. src
2018-11-022018-11-03 2018 VP1 0.00101 AU (151,000 km; 94,000 mi)0.391–530.8— data  · 2018 VP1
2018-11-052018-11-082018 VT50.00123 AU (184,000 km; 114,000 mi)0.484–1628.3— data  · 2018 VT5
2018-11-062018-11-072018 VO50.000942 AU (140,900 km; 87,600 mi)0.379–3326.7— data  · 2018 VO5
2018-11-102018-11-042018 VX1 aka
2018 VA6		0.00255 AU (381,000 km; 237,000 mi)0.9946–2227.5— data  · 2018 VX1
2018-11-112018-11-112018 VS100.00103 AU (154,000 km; 96,000 mi)0.403–1029.1— Temp. src
2018-11-132018-11-102018 VC70.00224 AU (335,000 km; 208,000 mi)0.877–2327.4— data  · 2018 VC7
2018-11-132018-11-162018 WA10.00168 AU (251,000 km; 156,000 mi)0.652–730.0— data  · 2018 WA1
2018-11-142018-11-152018 VJ100.00133 AU (199,000 km; 124,000 mi)0.524–1228.6✓ data  · 2018 VJ10
2018-11-152018-11-17ZW84BCD0.000845 AU (126,400 km; 78,500 mi)0.33 [note 16] 2–730.0— Src
2018-11-162018-11-17ZW87F010.000594 AU (88,900 km; 55,200 mi)0.23 [note 17] 1–232.3— Src
2018-11-162018-11-172018 WH0.00127 AU (190,000 km; 118,000 mi)0.502–829.8— data  · 2018 WH
2018-11-162018-11-172018 WG0.000206 AU (30,800 km; 19,100 mi)0.0803–1029.3— data  · 2018 WG
2018-11-182018-11-172018 WE0.00160 AU (239,000 km; 149,000 mi)0.624–1628.3✓ data  · 2018 WE
2018-11-192018-11-172018 WJ0.000794 AU (118,800 km; 73,800 mi)0.316–2627.5— data  · 2018 WJ
2018-11-252018-11-262018 WE10.000715 AU (107,000 km; 66,500 mi)0.2812–5126.0— data  · 2018 WE1
2018-11-272018-11-282018 WZ10.000729 AU (109,100 km; 67,800 mi)0.283–929.4— data  · 2018 WZ1
2018-11-282018-11-292018 WA30.00216 AU (323,000 km; 201,000 mi)0.845–2027.8— data  · 2018 WA3
2018-11-282018-11-29ZW900BE0.000224 AU (33,500 km; 20,800 mi)0.087 [note 18] 1–431.2— Src
2018-11-302018-11-292018 WG20.00134 AU (200,000 km; 125,000 mi)0.522–730.1— data  · 2018 WG2
2018-12-022018-11-29 2018 WV1 0.000221 AU (33,100 km; 20,500 mi)0.0862–630.2— data  · 2018 WV1
2018-12-112018-12-132018 XA40.00249 AU (372,000 km; 231,000 mi)0.973–1129.1✓ data  · 2018 XA4
2018-12-272018-12-282018 YL20.000398 AU (59,500 km; 37,000 mi)0.153–1029.3— data  · 2018 YL2
2018-12-282018-12-292018 YO20.00131 AU (196,000 km; 122,000 mi)0.512–629.8— data  · 2018 YO2
2018-12-282019-01-032019 AW20.00110 AU (165,000 km; 102,000 mi)0.4322–6925.1— data  · 2019 AW2
2018-12-302018-12-312018 YJ40.000725 AU (108,500 km; 67,400 mi)0.282–729.8— Temp. src

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 Silhouette of man standing and facing forward.svg
Silhouette of man standing and facing forward

(size of a person for comparison)

Circle frame.svgAfter closest approach: 10 (55.6%)< 24 hours before: 6 (33.3%)up to 7 days before: 2 (11.1%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Abs Magnitude 29-30

Circle frame.svgAfter closest approach: 15 (71.4%)< 24 hours before: 2 (9.5%)up to 7 days before: 4 (19.0%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Absolute Magnitude 28-29

Circle frame.svgAfter closest approach: 12 (57.1%)< 24 hours before: 1 (4.8%)up to 7 days before: 8 (38.1%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Absolute Magnitude 27-28

Circle frame.svgAfter closest approach: 7 (43.8%)< 24 hours before: 2 (12.5%)up to 7 days before: 6 (37.5%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 1 (6.2%)

Absolute Magnitude 26-27

Circle frame.svgAfter closest approach: 7 (70.0%)< 24 hours before: 0 (0.0%)up to 7 days before: 3 (30.0%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Absolute Magnitude 25-26

Circle frame.svgAfter 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 less than 25 (largest)

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

Notes

  1. ↑ For a list of current Earth close approaches see NEO Earth Close Approaches
  2. ↑ 2018 GE3 passed Earth with a velocity with respect to Earth of 29.6 km/s and was approaching the Sun at 35.9 km/s.
  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. ↑ Largest known asteroid to pass so close to Earth since 2002 JE9 in 1971.
  5. ↑ distance error: 0.0000107 AU, approach range: 0 to 0.0052 LD. Assuming the observations were not made in error, there was a (~9%) this asteroid hit the Earth (Impact path). However, there was no record of an impact reported, so if it did indeed impact Earth, it was likely in an uninhabited region or in the Pacific ocean. (The further west in the impact path, the larger the asteroid would be. If it hit west of Africa or in the Indian ocean, it would have been several meters across and have been recorded.) The asteroid is unconfirmed and will likely never receive a provisional designation.
  6. ↑ distance error: 0.000305 AU, approach range: 0.037 to 0.27 LD. The asteroid is unconfirmed and will likely never receive a provisional designation.
  7. ↑ 0.00141+0.00156
    −0.00137     AU, approach range: 0.018 to 1.157 LD. There is no chance that it impacted Earth, as the minimum distance (0.018 LD) is still roughly 410 kilometers above Earth's surface.
  8. ↑ distance error: 0.000347 AU, approach range: 0.047 to 0.32 LD. The asteroid is unconfirmed and will likely never receive a provisional designation.
  9. ↑ 2018 LA was estimated to have an 82% chance of impacting Earth somewhere between the central Pacific ocean and Africa (Impact path Archived 2018-06-13 at the Wayback Machine ). Several reports have come from South Africa and Botswana confirming that it did indeed impact in central Africa
  10. ↑ distance error: 0.00000608 AU, approach range: 0.078 to 0.082 LD. The asteroid is unconfirmed and will likely never receive a provisional designation.
  11. ↑ distance error: 0.000184 AU, approach range: 0.13 to 0.28 LD. The asteroid is unconfirmed and will likely never receive a provisional designation.
  12. ↑ distance error: 0.000296 AU, approach range: 0.40 to 0.63 LD. The asteroid is unconfirmed and will likely never receive a provisional designation.
  13. ↑ distance error: 0.0000651 AU, approach range: 0.085 to 0.136 LD. The asteroid is unconfirmed and will likely never receive a provisional designation.
  14. ↑ distance error: 0.000600 AU, approach range: 0.43 to 0.89 LD. The asteroid is unconfirmed and will likely never receive a provisional designation.
  15. ↑ distance error: 0.0000181 AU, approach range: 0.100 to 0.115 LD.
  16. ↑ distance error: 0.0000114 AU, approach range: 0.325 to 0.333 LD. The asteroid is unconfirmed and will likely never receive a provisional designation.
  17. ↑ distance error: 0.000583 AU, approach range: 0.017 to 0.46 LD. The asteroid is unconfirmed and will likely never receive a provisional designation. There is no chance of impact as the asteroid was discovered after its closest approach.
  18. ↑ distance error: 0.000165 AU, approach range: 0.023 to 0.152 LD. The asteroid is unconfirmed and will likely never receive a provisional designation.

Timeline of close approaches less than one lunar distance from the Moon

The number of asteroids listed here are significantly less than those of asteroids that approach Earth for several reasons. Asteroids that approach Earth not only move faster, but are brighter and are easier to detect with modern surveys because:

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

Date of
closest
approach		Object Nominal lunocentric
distance (AU) [note2 1] 		Nominal lunocentric
distance (LD)		Size (m)
(approximate)		(H)
approach
distance
to Earth
(LD)		Refs
2018-01-152018 BW0.00212  AU (317,000  km ; 197,000  mi )0.825–1728.10.43 data  · 2018 BW
2018-01-19 2018 BD 0.00123 AU (184,000 km; 114,000 mi)0.482–630.20.10 data  · 2018 BD
2018-01-202018 BL110.00186 AU (278,000 km; 173,000 mi)0.725–1528.30.79 data  · 2018 BL11
2018-01-24ZB0A2620.00148 AU (221,000 km; 138,000 mi)0.57 [note2 2] 2–530.60.16 Src
2018-02-032018 CT0.00249 AU (372,000 km; 231,000 mi)0.9715–4725.81.69 data  · 2018 CT
2018-02-06 2018 CF2 0.00204 AU (305,000 km; 190,000 mi)0.794–2028.00.25 data  · 2018 CF2
2018-02-242018 DN40.00128 AU (191,000 km; 119,000 mi)0.50 [note2 3] 4–1428.40.55 data  · 2018 DN4
2018-03-01 2018 DV1 0.000893 AU (133,600 km; 83,000 mi)0.354–1528.40.29 data  · 2018 CD1
2018-03-142018 EZ20.00136 AU (203,000 km; 126,000 mi)0.5310–3426.50.56 data  · 2018 EZ2
2018-03-172018 FL290.00187 AU (280,000 km; 174,000 mi)0.732–730.10.58 data  · 2018 FL29
2018-03-172018 FE30.00118 AU (177,000 km; 110,000 mi)0.468–2727.10.38 data  · 2018 FE3
2018-03-302018 FK50.00157 AU (235,000 km; 146,000 mi)0.614–1628.30.39 data  · 2018 FK5
2018-04-132018 GD20.00221 AU (331,000 km; 205,000 mi)0.863–929.40.78 data  · 2018 GD2
2018-04-15 2018 GE3 0.000876 AU (131,000 km; 81,400 mi)0.3437–13823.60.50 data  · 2018 GE3
2018-05-232018 KW10.00146 AU (218,000 km; 136,000 mi)0.573–829.70.39 data  · 2018 KW1
2018-06-02 2018 LA 0.00208 AU (311,000 km; 193,000 mi)0.832–330.5Impact data  · 2018 LA
2018-06-162018 MZ40.000527 AU (78,800 km; 49,000 mi)0.204–1128.80.54 data  · 2018 MZ4
2018-06-17A107j4p0.00256 AU (383,000 km; 238,000 mi)0.995 [note2 4] 4–1128.90.080 Src
2018-06-23A107pL20.00208 AU (311,000 km; 193,000 mi)0.81 [note2 5] 3–929.50.20 Src
2018-07-022018 NH0.00109 AU (163,000 km; 101,000 mi)0.4324–8824.61.13 data  · 2018 NH
2018-07-05ZN2E0900.00168 AU (251,000 km; 156,000 mi)0.65 [note2 6] 4–1228.80.51 Src
2018-07-072018 NX0.00152 AU (227,000 km; 141,000 mi)0.597–1827.70.30 data  · 2018 NX
2018-07-082018 NW0.00165 AU (247,000 km; 153,000 mi)0.646–1827.80.32 data  · 2018 NW
2018-07-242018 OF20.000713 AU (106,700 km; 66,300 mi)0.288–2127.41.14 data  · 2018 OF2
2018-08-042018 PY70.00182 AU (272,000 km; 169,000 mi)0.719–3326.71.07 data  · 2018 PY7
2018-08-10 2018 PD20 0.00117 AU (175,000 km; 109,000 mi)0.467–2227.40.087 data  · 2018 PD20
2018-08-122018 OF20.00178 AU (266,000 km; 165,000 mi)0.691–431.30.11 data  · 2018 OF2
2018-08-152018 PY230.00117 AU (175,000 km; 109,000 mi)0.456–1727.91.32 data  · 2018 PY23
2018-08-19ZTF00VP0.00149 AU (223,000 km; 139,000 mi)0.58 [note2 7] 3–1129.01.12 Src
2018-09-032018 RR10.00254 AU (380,000 km; 236,000 mi)0.9902–729.80.95 data  · 2018 RR1
2018-09-052018 RS0.00220 AU (329,000 km; 205,000 mi)0.852–1229.50.28 data  · 2018 RS
2018-09-072018 RJ30.00200 AU (299,000 km; 186,000 mi)0.786–1927.80.44 data  · 2018 RJ3
2018-09-082018 RW0.00256 AU (383,000 km; 238,000 mi)0.9972–730.30.44 data  · 2018 RW
2018-09-102018 RC0.00244 AU (365,000 km; 227,000 mi)0.9523–8724.60.58 data  · 2018 RC
2018-09-122018 RZ50.00134 AU (200,000 km; 125,000 mi)0.522-829.70.13 data  · 2018 RZ5
2018-09-152018 SM0.00188 AU (281,000 km; 175,000 mi)0.733-929.40.11 data  · 2018 SM
2018-09-152018 SN30.00229 AU (343,000 km; 213,000 mi)0.892–729.90.51 data  · 2018 SN3
2018-09-192018 RF80.00154 AU (230,000 km; 143,000 mi)0.6014–5025.81.37 data  · 2018 RF8
2018-09-242018 SD20.00193 AU (289,000 km; 179,000 mi)0.754-1228.60.23 data  · 2018 SD2
2018-10-062018 TV50.000749 AU (112,000 km; 69,600 mi)0.293–929.50.27 data  · 2018 TV5
2018-10-172018 UL0.000992 AU (148,400 km; 92,200 mi)0.393–1129.10.57 data  · 2018 UL
2018-10-19 2018 UA 0.00189 AU (283,000 km; 176,000 mi)0.742–630.20.036 data  · 2018 UA
2018-11-012018 VQ100.00215 AU (322,000 km; 200,000 mi)0.842–530.60.11 Temp. Src
2018-11-032018 VV30.00131 AU (196,000 km; 122,000 mi)0.5113–3626.21.13 data  · 2018 VV3
2018-11-042018 WS0.00212 AU (317,000 km; 197,000 mi)0.8911–3426.51.74 data  · 2018 WS
2018-11-052018 VO50.00247 AU (370,000 km; 230,000 mi)0.969–3326.70.37 data  · 2018 VO5
2018-11-06ZV33FBC0.00147 AU (220,000 km; 137,000 mi)0.57 [note2 8] 9–2826.90.57 Src
2018-11-142018 VJ100.00124 AU (186,000 km; 115,000 mi)0.484–1228.60.52 data  · 2018 VJ10
2018-11-152018 WA10.00243 AU (364,000 km; 226,000 mi)0.952–730.00.65 data  · 2018 WA1
2018-11-15ZW87F010.00195 AU (292,000 km; 181,000 mi)0.76 [note2 9] 1–232.30.23 Src
2018-11-162018 WH0.00215 AU (322,000 km; 200,000 mi)0.832–829.80.50 data  · 2018 WH
2018-11-182018 WE0.00133 AU (199,000 km; 124,000 mi)0.524–1628.30.62 data  · 2018 WE
2018-11-192018 WJ0.00228 AU (341,000 km; 212,000 mi)0.896–2627.50.31 data  · 2018 WJ
2018-11-252018 WE10.00142 AU (212,000 km; 132,000 mi)0.5512–5126.00.28 data  · 2018 WE1
2018-11-25ZTF01p20.00246 AU (368,000 km; 229,000 mi)0.96 [note2 10] 10–3126.71.47 Src
2018-11-252018 WH10.00197 AU (295,000 km; 183,000 mi)0.774–1428.51.18 data  · 2018 WH1
2018-11-272018 WZ10.00225 AU (337,000 km; 209,000 mi)0.883–929.40.28 data  · 2018 WZ1
2018-11-28ZW900BE0.00255 AU (381,000 km; 237,000 mi)0.993 [note2 11] 1–431.20.087 Src
2018-12-052018 WV10.00225 AU (337,000 km; 209,000 mi)0.882–630.20.086 data  · 2018 WV1
2018-12-082018 XP20.00176 AU (263,000 km; 164,000 mi)0.685–1628.11.009 data  · 2018 XP2
2018-12-112018 XA40.00158 AU (236,000 km; 147,000 mi)0.613–1129.10.97 data  · 2018 XA4
2018-12-272018 YL20.00131 AU (196,000 km; 122,000 mi)0.513–1029.30.15 data  · 2018 YL2
2018-12-302018 YJ40.000253 AU (37,800 km; 23,500 mi)0.982–729.80.28 Temp. src

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. ↑ distance error: 0.000633 AU, approach range: 0.33 to 0.82 LD. The asteroid is unconfirmed and will likely never receive a provisional designation.
  3. ↑ 0.00128+0.00123
    −0.000241     AU. Approach range: 0.41 to 0.98 LD.
  4. ↑ distance error: 0.00000167 AU, approach range: 0.9942 to 0.9955 LD. The asteroid is unconfirmed and will likely never receive a provisional designation.
  5. ↑ distance error: 0.000198 AU, approach range: 0.73 to 0.89 LD. The asteroid is unconfirmed and will likely never receive a provisional designation.
  6. ↑ distance error: 0.000194 AU, approach range: 0.58 to 0.73 LD. The asteroid is unconfirmed and will likely never receive a provisional designation.
  7. ↑ distance error: Unknown, Approach range: Unknown. The asteroid is unconfirmed and will likely never receive a provisional designation.
  8. ↑ distance error: 0.000390 AU, approach range: 0.42 to 0.72 LD. The asteroid is unconfirmed and will likely never receive a provisional designation.
  9. ↑ distance error: 0.000506 AU, approach range: 0.56 to 0.95 LD. The asteroid is unconfirmed and will likely never receive a provisional designation.
  10. ↑ distance error: 0.0000329 AU, approach range: 0.943 to 0.968 LD. The asteroid is unconfirmed and will likely never receive a provisional designation.
  11. ↑ distance error: 0.0000552 AU, approach range: 0.972 to 1.015 LD. The asteroid is unconfirmed and will likely never receive a provisional designation.

Additional examples

Radar images of binary asteroid 2017 YE5 upon close approach in June 2018 PIA22559.gif
Radar images of binary asteroid 2017 YE5 upon close approach in June 2018
Radar animation of 2001 KB67 after its passage in May 2018 2001 KB67 Radar May28.gif
Radar animation of 2001 KB67 after its passage in May 2018

An example list of near-Earth asteroids that passed more than 1 lunar distance (384,400 km or 0.00256 AU) from Earth in 2018.

ObjectSize
meters		 lunar
distances 		DateRef
(276033) 2002 AJ129 62410.92018-02-04 JPL
3752 Camillo 230653.62018-02-20 JPL
2017 VR12 2713.762018-03-07 JPL
1981 Midas 340034.92018-03-21 JPL
2018 GU1461.702018-04-08 JPL
(388945) 2008 TZ3 2856.482018-05-09 JPL
(68347) 2001 KB67 3599.502018-05-29 JPL
2017 YE5 86015.52018-06-21 JPL
2018 NL321.422018-06-28 JPL
(4953) 1990 MU 280041.62018-11-29 JPL
2013 VX4624.092018-12-09 JPL
(163899) 2003 SD220 8007.362018-12-22 JPL

Statistics

Approaches by month
month<1 LD<5 LD
January
11
31
February
9
21
March
7
30
April
7
26
May
3
21
June
5
11
July
3
9
August
3
12
September
13
50
October
5
26
November
21
39
December
6
23
Approaches by size
Abs. mag <1 LD<5 LD
H <20
0
0
<21
0
1
<22
0
0
<23
1
1
<24
2
6
<25
1
20
<26
3
37
<27
10
73
<28
15
84
<29
22
49
<30
22
25
<31
15
16
<32
2
2
<33
1
1
Discoveries by survey
Survey<1 LD<5 LD
( 568 ) Mauna Kea
0
1
( 703 ) Catalina Sky Survey
28
98
( 704 ) Lincoln Laboratory ETS
0
2
( D29 ) XuYi Station, Purple Mountain
0
1
( F51 ) Pan-STARRS 1
1
11
( F52 ) Pan-STARRS 2
1
10
( G96 ) Mt. Lemmon Survey
37
121
( I41 ) Zwicky Transient Facility
10
37
( Q66 ) JAXA, Siding Spring Observatory
1
4
( T05 ) ATLAS-HKO
6
17
( T08 ) ATLAS-MLO
8
17
( Y00 ) SONEAR Observatory
1
1

Virtual Impactors

List of asteroids that are listed on the Sentry Risk Table because they have short observation arcs with poorly constrained orbits and have a chance of impacting Earth in 2018. Given a short observation arc, many different orbits fit the observed data. These objects could be millions if not billions of kilometers from Earth on the date of a low probability virtual impactor. For example, 2005 TM173 is expected to be 5  AU (700 million  km ) from Earth in December 2018 around the time of the 3 virtual impactors. [4] 2010 GZ60 was removed from the sentry table in February 2018 after further observations were found by NEOWISE, ruling out any possible impacts.

Cumulatively among the asteroids listed below, there is a roughly 1 in 98,700 chance that any of the asteroids will impact Earth in 2018. Most of this comes from asteroid 2008 US which is only ~2 meters in diameter and had a 1 in 240,000 chance of impact on 18 April 2018.

Also included are asteroids discovered before impact (specifically, 2018 LA) and exceptionally massive fireballs with either an equivalent yield of more than 1 kiloton of TNT or an estimated size of more than 3 meters.

DateObjectEstimated
diameter
(meters)		 Obs
arc
(days)		Impact
probability
(1 in)		Sigma from
best-fit orbit
[note3 1] 		Palermo
scale 		JPL Horizons
nominal geocentric
distance (AU)		 NEODyS
nominal geocentric
distance (AU)
2018-01-31 [5] 2011 CF66 [note3 2] 90.182,100,000,0000.994-7.871.1 AU (160,000,000 km; 100,000,000 mi)0.23 AU (34,000,000 km; 21,000,000 mi)
2018-02-10 [6] 2008 EL68 [note3 3] 90.071370,000,0000.039-8.381.3 AU (190,000,000 km; 120,000,000 mi)1.1 AU (160,000,000 km; 100,000,000 mi)
2018-02-15 [5] 2011 CF6690.18100,000,000-2.100-7.701.2 AU (180,000,000 km; 110,000,000 mi)0.25 AU (37,000,000 km; 23,000,000 mi)
2018-02-15 [5] 2011 CF6690.18140,000,000-1.183-7.821.2 AU (180,000,000 km; 110,000,000 mi)0.25 AU (37,000,000 km; 23,000,000 mi)
2018-02-17 [5] 2011 CF6690.18120,000,000-0.465-7.671.2 AU (180,000,000 km; 110,000,000 mi)0.25 AU (37,000,000 km; 23,000,000 mi)
2018-02-24 [7] 2009 VZ39 [note3 4] 90.043110,000,0000.948-7.632.7 AU (400,000,000 km; 250,000,000 mi)4.1 AU (610,000,000 km; 380,000,000 mi)
2018-02-25 [6] 2008 EL6890.0712,000,000-0.690-6.261.3 AU (190,000,000 km; 120,000,000 mi)1.2 AU (180,000,000 km; 110,000,000 mi)
2018-02-26 [8] 2015 HV182 [note3 5] 1571.02,100,000,0000.096-5.472.4 AU (360,000,000 km; 220,000,000 mi)2.4 AU (360,000,000 km; 220,000,000 mi)
2018-02-26 [9] 2008 JD3390.12290,000,000-2.389-8.340.95 AU (142,000,000 km; 88,000,000 mi)2.8 AU (420,000,000 km; 260,000,000 mi)
2018-03-01 [10] 2008 EK6840.0401,100,000,0000.697-9.012.9 AU (430,000,000 km; 270,000,000 mi)2.3 AU (340,000,000 km; 210,000,000 mi)
2018-03-09 [6] 2008 EL6890.0711,700,000,0001.232-8.051.4 AU (210,000,000 km; 130,000,000 mi)1.2 AU (180,000,000 km; 110,000,000 mi)
2018-03-10 [6] 2008 EL6890.0711,100,000,0000.806-8.351.4 AU (210,000,000 km; 130,000,000 mi)1.2 AU (180,000,000 km; 110,000,000 mi)
2018-03-11 [11] 2005 ED224 543.12,400,0001.438-3.721.6 AU (240,000,000 km; 150,000,000 mi)2.1 AU (310,000,000 km; 200,000,000 mi)
2018-03-11 [6] 2008 EL6890.0712,900,0000.544-6.011.4 AU (210,000,000 km; 130,000,000 mi)1.2 AU (180,000,000 km; 110,000,000 mi)
2018-03-11 [12] 2008 EM68 [note3 6] 100.113,400,0001.198-6.092.7 AU (400,000,000 km; 250,000,000 mi)3.0 AU (450,000,000 km; 280,000,000 mi)
2018-03-21 [13] 2014 OY391220.972,000,000,0003.436-7.943.4 AU (510,000,000 km; 320,000,000 mi)3.4 AU (510,000,000 km; 320,000,000 mi)
2018-03-22 [14] 2014 MV67 5370.931,900,000,0000.195-4.683.8 AU (570,000,000 km; 350,000,000 mi)2.4 AU (360,000,000 km; 220,000,000 mi)
2018-04-08 [15] 2014 HG196 [note3 7] 161.01,900,000,0000.196-8.193.0 AU (450,000,000 km; 280,000,000 mi)3.4 AU (510,000,000 km; 320,000,000 mi)
2018-04-10 [16] 2016 AZ193 [note3 8] 190.1691,000,0000.155-6.860.63 AU (94,000,000 km; 59,000,000 mi)0.60 AU (90,000,000 km; 56,000,000 mi)
2018-04-18 [17] 2008 US20.081240,0000.253-6.561.0 AU (150,000,000 km; 93,000,000 mi)1.0 AU (150,000,000 km; 93,000,000 mi)
2018-04-19 [18] N/A (not discovered
before impact)		4N/A10.0000N/A
(impact)		N/A
(impact)
2018-04-24 [19] 2008 UY91360.12310,000,0000.687-6.633.8 AU (570,000,000 km; 350,000,000 mi)3.8 AU (570,000,000 km; 350,000,000 mi)
2018-04-29 [16] 2016 AZ193190.16210,000,000-0.099-7.670.72 AU (108,000,000 km; 67,000,000 mi)0.69 AU (103,000,000 km; 64,000,000 mi)
2018-04-30 [20] 2014 HD19840.97710,000-1.705-6.183.7 AU (550,000,000 km; 340,000,000 mi)3.7 AU (550,000,000 km; 340,000,000 mi)
2018-05-04 [21] 2008 LE220.14270,000,000-0.137-7.012.3 AU (340,000,000 km; 210,000,000 mi)2.3 AU (340,000,000 km; 210,000,000 mi)
2018-05-08 [7] 2009 VZ3990.043210,000,0001.159-7.451.9 AU (280,000,000 km; 180,000,000 mi)3.0 AU (450,000,000 km; 280,000,000 mi)
2018-05-17 [22] 2008 VS4 [note3 9] 490.083480,000,0001.108-6.642.3 AU (340,000,000 km; 210,000,000 mi)1.6 AU (240,000,000 km; 150,000,000 mi)
2018-06-02 2018 LA 30.1610.000>00.00004 AU (6,000 km; 3,700 mi)
(impact)		0.00004 AU (6,000 km; 3,700 mi)
(impact)
2018-06-03 [23] 2014 LY21 [note3 10] 50.045910,000-0.349-5.671.1 AU (160,000,000 km; 100,000,000 mi)1.3 AU (190,000,000 km; 120,000,000 mi)
2018-06-03 [23] 2014 LY2150.045670,0000.067-6.101.1 AU (160,000,000 km; 100,000,000 mi)1.3 AU (190,000,000 km; 120,000,000 mi)
2018-06-04 [23] 2014 LY2150.045340,000,0000.474-9.171.1 AU (160,000,000 km; 100,000,000 mi)1.3 AU (190,000,000 km; 120,000,000 mi)
2018-06-21 [18] N/A (not discovered
before impact)		5N/A10.0000N/A
(impact)		N/A
(impact)
2018-06-22 [8] 2015 HV1821571.0500,000,000-0.333-5.621.9 AU (280,000,000 km; 180,000,000 mi)1.9 AU (280,000,000 km; 180,000,000 mi)
2018-07-25 [18] N/A (not discovered
before impact)		3N/A10.0000N/A
(impact)		N/A
(impact)
2018-08-12 [15] 2014 HG196161.0310,000,000-0.816-7.791.8 AU (270,000,000 km; 170,000,000 mi)1.6 AU (240,000,000 km; 150,000,000 mi)
2018-08-19 [24] 2015 ME131 4991.8560,000,0000.768-4.131.3 AU (190,000,000 km; 120,000,000 mi)1.3 AU (190,000,000 km; 120,000,000 mi)
2018-08-30 [12] 2008 EM68100.116,200,000,0002.277-9.632.8 AU (420,000,000 km; 260,000,000 mi)3.2 AU (480,000,000 km; 300,000,000 mi)
2018-09-07 [12] 2008 EM68100.11170,000,0001.084-7.952.7 AU (400,000,000 km; 250,000,000 mi)3.1 AU (460,000,000 km; 290,000,000 mi)
2018-09-10 [12] 2008 EM68100.1191,000,0000.297-7.562.7 AU (400,000,000 km; 250,000,000 mi)3.1 AU (460,000,000 km; 290,000,000 mi)
2018-09-11 [12] 2008 EM68100.11120,000,000-0.315-7.562.7 AU (400,000,000 km; 250,000,000 mi)3.1 AU (460,000,000 km; 290,000,000 mi)
2018-09-11 [12] 2008 EM68100.11710,000,000-1.258-8.142.7 AU (400,000,000 km; 250,000,000 mi)3.1 AU (460,000,000 km; 290,000,000 mi)
2018-09-12 [12] 2008 EM68100.11220,000,000-0.824-7.722.7 AU (400,000,000 km; 250,000,000 mi)3.0 AU (450,000,000 km; 280,000,000 mi)
2018-09-12 [12] 2008 EM68100.117,700,000,000-2.041-8.912.7 AU (400,000,000 km; 250,000,000 mi)3.0 AU (450,000,000 km; 280,000,000 mi)
2018-09-12 [12] 2008 EM68100.111,800,000,000-1.660-8.392.7 AU (400,000,000 km; 250,000,000 mi)3.0 AU (450,000,000 km; 280,000,000 mi)
2018-09-13 [25] 2015 HW182311.01,400,000,000-1.839-7.551.3 AU (190,000,000 km; 120,000,000 mi)1.4 AU (210,000,000 km; 130,000,000 mi)
2018-09-18 [26] 2015 HS182233.01,100,000,0001.918-7.983.0 AU (450,000,000 km; 280,000,000 mi)3.0 AU (450,000,000 km; 280,000,000 mi)
2018-09-19 [8] 2015 HV1821571.0770,000,000-0.337-5.872.3 AU (340,000,000 km; 210,000,000 mi)2.3 AU (340,000,000 km; 210,000,000 mi)
2018-09-20 [27] 2009 FZ4310.6014,000,0000.453-5.771.3 AU (190,000,000 km; 120,000,000 mi)0.62 AU (93,000,000 km; 58,000,000 mi)
2018-09-25 [18] N/A (not discovered
before impact)		4N/A10.0000N/A
(impact)		N/A
(impact)
2018-09-26 [8] 2015 HV1821571.02,400,000,0000.029-6.092.4 AU (360,000,000 km; 220,000,000 mi)2.4 AU (360,000,000 km; 220,000,000 mi)
2018-10-02 [28] 2016 JO38370.9753,000,0000.328-6.083.9 AU (580,000,000 km; 360,000,000 mi)1.6 AU (240,000,000 km; 150,000,000 mi)
2018-10-22 [29] 2008 UM120.0313,300,000,000-0.299-11.24.8 AU (720,000,000 km; 450,000,000 mi)3.8 AU (570,000,000 km; 350,000,000 mi)
2018-10-27 [30] 2014 HR197 [note3 11] 140.962,100,000,000-1.613-8.251.2 AU (180,000,000 km; 110,000,000 mi)1.7 AU (250,000,000 km; 160,000,000 mi)
2018-10-28 [30] 2014 HR197140.96500,000,000-0.177-7.921.2 AU (180,000,000 km; 110,000,000 mi)1.7 AU (250,000,000 km; 160,000,000 mi)
2018-10-30 [30] 2014 HR197140.968,300,000,0001.972-9.431.2 AU (180,000,000 km; 110,000,000 mi)1.7 AU (250,000,000 km; 160,000,000 mi)
2018-11-01 [31] 2008 VL90.12710,000,0001.279-8.274.5 AU (670,000,000 km; 420,000,000 mi)4.5 AU (670,000,000 km; 420,000,000 mi)
2018-11-12 [7] 2009 VZ3990.04377,000,000-0.297-7.790.29 AU (43,000,000 km; 27,000,000 mi)3.7 AU (550,000,000 km; 340,000,000 mi)
2018-11-12 [7] 2009 VZ3990.043770,000,000-0.704-8.260.29 AU (43,000,000 km; 27,000,000 mi)3.7 AU (550,000,000 km; 340,000,000 mi)
2018-11-12 [32] 2010 VP139 [note3 12] 60.04656,000,0000.822-8.270.44 AU (66,000,000 km; 41,000,000 mi)0.43 AU (64,000,000 km; 40,000,000 mi)
2018-11-12 [7] 2009 VZ3990.04332,000,0000.008-7.610.29 AU (43,000,000 km; 27,000,000 mi)3.7 AU (550,000,000 km; 340,000,000 mi)
2018-11-12 [32] 2010 VP13960.0461,900,000,0002.113-9.460.44 AU (66,000,000 km; 41,000,000 mi)0.43 AU (64,000,000 km; 40,000,000 mi)
2018-11-16 [7] 2009 VZ3990.04367,000,0000.981-7.600.28 AU (42,000,000 km; 26,000,000 mi)3.7 AU (550,000,000 km; 340,000,000 mi)
2018-11-16 [22] 2008 VS4490.08310,000,000,0001.753-7.733.4 AU (510,000,000 km; 320,000,000 mi)0.19 AU (28,000,000 km; 18,000,000 mi)
2018-11-20 [18] N/A (not discovered
before impact)		3N/A10.0000N/A
(impact)		N/A
(impact)
2018-11-29 [22] 2008 VS4490.0831,300,000,0000.856-7.423.4 AU (510,000,000 km; 320,000,000 mi)0.22 AU (33,000,000 km; 20,000,000 mi)
2018-12-11 [33] 2010 XC50.05840,000,000-0.250-8.272.4 AU (360,000,000 km; 220,000,000 mi)2.3 AU (340,000,000 km; 210,000,000 mi)
2018-12-13 [34] 2005 TM173 [note3 13] 511.92,000,000,0000.455-7.485.3 AU (790,000,000 km; 490,000,000 mi)5.3 AU (790,000,000 km; 490,000,000 mi) [4]
2018-12-14 [35] 2010 WW8180.066710,000,0001.218-7.872.9 AU (430,000,000 km; 270,000,000 mi)3.4 AU (510,000,000 km; 320,000,000 mi)
2018-12-14 [36] 2014 JT79 [note3 14] 132.8830,000,0000.401-7.753.1 AU (460,000,000 km; 290,000,000 mi)3.0 AU (450,000,000 km; 280,000,000 mi)
2018-12-15 [34] 2005 TM173511.9450,000,000-0.856-6.645.3 AU (790,000,000 km; 490,000,000 mi)5.3 AU (790,000,000 km; 490,000,000 mi) [4]
2018-12-16 [36] 2014 JT79132.8230,000,0000.147-7.533.1 AU (460,000,000 km; 290,000,000 mi)3.0 AU (450,000,000 km; 280,000,000 mi)
2018-12-17 [37] 2010 GZ60 [note3 15] ? (2000)1.4 (1.3)N/A (91,000,000)N/A (1.952)N/A (-2.43)6.9 AU (1.03×109 km; 640,000,000 mi)Not listed
2018-12-18 [36] 2014 JT79132.891,000,000-0.252-7.513.1 AU (460,000,000 km; 290,000,000 mi)3.1 AU (460,000,000 km; 290,000,000 mi)
2018-12-18 [38] 2010 MY1122311.41,000,000,000-0.262-5.143.4 AU (510,000,000 km; 320,000,000 mi)2.2 AU (330,000,000 km; 200,000,000 mi)
2018-12-18 [18] N/A (not discovered
before impact)		12N/A10.0000N/A
(impact)		N/A
(impact)
2018-12-20 [34] 2005 TM173511.93,400,000,000-1.991-7.295.3 AU (790,000,000 km; 490,000,000 mi)5.2 AU (780,000,000 km; 480,000,000 mi) [4]
2018-12-22 [36] 2014 JT79132.8200,000,000-1.085-8.383.1 AU (460,000,000 km; 290,000,000 mi)3.1 AU (460,000,000 km; 290,000,000 mi)
2018-12-23 [39] 2013 YB20.1617,000,0003.754-9.062.3 AU (340,000,000 km; 210,000,000 mi)2.3 AU (340,000,000 km; 210,000,000 mi)
2018-12-26 [6] 2008 EL6890.0713,200,000,000-0.855-9.741.4 AU (210,000,000 km; 130,000,000 mi)1.1 AU (160,000,000 km; 100,000,000 mi)
2018-12-29 [16] 2016 AZ193190.162,800,000,0000.411-8.061.4 AU (210,000,000 km; 130,000,000 mi)1.4 AU (210,000,000 km; 130,000,000 mi)
2018-12-30 [16] 2016 AZ193190.166,200,000,0000.502-8.221.4 AU (210,000,000 km; 130,000,000 mi)1.3 AU (190,000,000 km; 120,000,000 mi)

Notes

  1. ↑ This is a measurement of how far off of the "best fit" orbit the asteroid would have to have for it to hit at this time. Further values from 0 mean that the measured positions of the asteroid used to calculate its orbit would need to be highly inaccurate for it to hit Earth. For reference, 1.0/-1.0=31.7% odds the observations would be this inaccurate, 2.0/-2.0=4.6% odds, 3.0/-3.0=0.27% odds.
  2. ↑ 2011 CF66 has a cumulative probability of 1 in 38,900,000 (Palermo scale -7.16) of impacting Earth in 2018.
  3. ↑ 2008 EL68 has a cumulative probability of 1 in 1,200,000 (Palermo scale -5.81) of impacting Earth in 2018.
  4. ↑ 2009 VZ39 has a cumulative probability of 1 in 13,600,000 (Palermo scale -6.89) of impacting earth in 2018.
  5. ↑ 2015 HV182 has a cumulative probability of 1 in 239,000,000 (Palermo scale -5.10) of impacting Earth in 2018.
  6. ↑ 2008 EM68 has a cumulative probability of 1 in 3,100,000 (Palermo scale -6.04) of impacting Earth in 2018.
  7. ↑ 2014 HG196 has a cumulative probability of 1 in 268,000,000 (Palermo scale -7.64) of impacting Earth in 2018.
  8. ↑ 2016 AZ193 has a cumulative probability of 1 in 61,300,000 (Palermo scale -6.76) of impacting Earth in 2018.
  9. ↑ 2008 VS4 has a cumulative probability of 1 in 339,000,000 (Palermo scale -6.54) of impacting Earth in 2018.
  10. ↑ 2014 LY21 has a cumulative probability of 1 in 384,000 (Palermo scale -5.53) of impacting Earth in 2018.
  11. ↑ 2014 HR197 has a cumulative probability of 1 in 385,000,000 (Palermo scale -7.74) of impacting Earth in 2018.
  12. ↑ 2010 VP139 has a cumulative probability of 1 in 54,000,000 (Palermo scale -8.24) of impacting earth in 2018.
  13. ↑ 2005 TM173 has a cumulative probability of 1 in 336,000,000 (Palermo scale -6.50) of impacting earth in 2018.
  14. ↑ 2014 JT79 has a cumulative probability of 1 in 46,300,000 (Palermo scale -7.08) of impacting Earth in 2018.
  15. ↑ 2010 GZ60 was ruled out as a potential impactor after another observation was found by NEOWISE, improving the orbit enough to determine that it is not a near-earth object

See also

Related Research Articles

<span class="mw-page-title-main">Near-Earth object</span> Small Solar System body whose orbit brings it close to the Earth

A near-Earth object (NEO) is any small Solar System body whose orbit brings it into proximity with Earth. By convention, a Solar System body is a NEO if its closest approach to the Sun (perihelion) is less than 1.3 astronomical units (AU). If a NEO's orbit crosses the Earth's orbit, and the object is larger than 140 meters (460 ft) across, it is considered a potentially hazardous object (PHO). Most known PHOs and NEOs are asteroids, but a small fraction are comets.

The Torino scale is a method for categorizing the impact hazard associated with near-Earth objects (NEOs) such as asteroids and comets. It is intended as a communication tool for astronomers and the public to assess the seriousness of collision predictions, by combining probability statistics and known kinetic damage potentials into a single threat value. The Palermo Technical Impact Hazard Scale is a similar, but more complex scale. Near-Earth objects with a Torino scale of 1 pop up every couple of months or so and may last a few weeks until they have a longer observation arc.

The Palermo Technical Impact Hazard Scale is a logarithmic scale used by astronomers to rate the potential hazard of impact of a near-Earth object (NEO). It combines two types of data—probability of impact and estimated kinetic yield—into a single "hazard" value. A rating of 0 means the hazard is equivalent to the background hazard. A rating of +2 would indicate the hazard is 100 times as great as a random background event. Scale values less than −2 reflect events for which there are no likely consequences, while Palermo Scale values between −2 and 0 indicate situations that merit careful monitoring. A similar but less complex scale is the Torino Scale, which is used for simpler descriptions in the non-scientific media.

<span class="mw-page-title-main">(29075) 1950 DA</span> Most hazardous risk–listed near-Earth asteroid

(29075) 1950 DA, provisional designation 1950 DA, is a risk–listed asteroid, classified as a near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 1.1 kilometers in diameter. It once had the highest known probability of impacting Earth. In 2002, it had the highest Palermo rating with a value of 0.17 for a possible collision in 2880. Since that time, the estimated risk has been updated several times. In December 2015, the odds of an Earth impact were revised to 1 in 8,300 (0.012%) with a Palermo rating of −1.42. As of 2022, It is listed on the Sentry Risk Table with the second highest cumulative Palermo rating of −2.05. 1950 DA is not assigned a Torino scale rating, because the 2880 date is over 100 years in the future.

99942 Apophis is a near-Earth asteroid and potentially hazardous asteroid with a diameter of 370 metres that caused a brief period of concern in December 2004 when initial observations indicated a probability up to 2.7% that it would hit Earth on April 13, 2029. Additional observations provided improved predictions that eliminated the possibility of an impact on Earth in 2029. Until 2006, a small probability nevertheless remained that, during its 2029 close encounter with Earth, Apophis would pass through a gravitational keyhole of no more than about 800 metres in diameter, which would have set up a future impact exactly seven years later on April 13, 2036. This possibility kept it at Level 1 on the Torino impact hazard scale until August 2006, when the probability that Apophis would pass through the keyhole was determined to be very small and Apophis' rating on the Torino scale was lowered to zero. By 2008, the keyhole had been determined to be less than 1 km wide. During the short time when it had been of greatest concern, Apophis set the record for highest rating ever on the Torino scale, reaching level 4 on December 27, 2004.

(144898) 2004 VD17, provisional designation 2004 VD17, is a sub-kilometer asteroid, classified as near-Earth object of the Apollo group once thought to have a low probability of impacting Earth on 4 May 2102. It reached a Torino Scale rating of 2 and a Palermo Technical Impact Hazard Scale rating of -0.25. With an observation arc of 17 years it is known that closest Earth approach will occur two days earlier on 2 May 2102 at a distance of about 5.5 million km.

1994 WR12 is an asteroid and near-Earth object approximately 130 meters (430 feet) in diameter. As a member of the Aten group almost all of its orbit is closer to the Sun than Earth is. On 24 November 1994 it passed about 374100 km from the Moon. First imaged at Kitami Observatory on 26 November 1994, it was discovered two nights later by American astronomer Carolyn S. Shoemaker at Palomar Observatory on 28 November 1994. The asteroid then went unobserved from 1994 until it was recovered by Mauna Kea in March 2016. It was removed from the Sentry Risk Table on 2 April 2016.

(529366) 2009 WM1, provisional designation 2009 WM1, is a sub-kilometer asteroid and near-Earth object of the Apollo group, approximately 280 meters (920 feet) in diameter. After its discovery by the Catalina Sky Survey at the Catalina Station in Arizona, United States, this potentially hazardous asteroid was briefly listed at a Torino Scale of 1 and a cumulative Palermo Scale of −0.87. It was removed from the Sentry Risk Table on 26 June 2013.

<span class="nowrap">(367789) 2011 AG<sub>5</sub></span> Near-Earth asteroid in 2040

(367789) 2011 AG5, provisional designation 2011 AG5, is a sub-kilometer asteroid, classified as near-Earth object and potentially hazardous asteroid of the Apollo group. It has a diameter of about 140 meters (460 ft). It was removed from the Sentry Risk Table on 21 December 2012 and as such it now has a rating of 0 on the Torino Scale. It was recovered in December 2022 extending the observation arc from 4.8 years to 14 years. As of 2023, the distance between the orbits of Earth and 2011 AG5 is 0.0004 AU (60,000 km; 0.16 LD)

<span class="mw-page-title-main">(410777) 2009 FD</span>

(410777) 2009 FD is a carbonaceous sub-kilometer asteroid and binary system, classified as near-Earth object and potentially hazardous asteroid of the Apollo group, discovered on 24 February 2009 by astronomers of the Spacewatch program at Kitt Peak National Observatory near Tucson, Arizona, in the United States.

2014 XL7 is a near-Earth object and Apollo asteroid, approximately 230 meters (750 feet) in diameter. It was the most dangerous potentially hazardous asteroid on Sentry Risk Table upon its discovery by the Mount Lemmon Survey in December 2014. At the time, the asteroid had a cumulative 1 in 83000 chance of impacting Earth on 4–5 June between the years 2048 and 2084. After the object's observation arc had been extended to 35 days, it was removed from the Sentry Risk Table on 15 January 2015. Since then the asteroid's orbit has been secured. Although it has an Earth minimum orbit intersection distance of less than one lunar distance, there are no projected close encounters with Earth in the foreseeable future, with its closest passage to occur in May 2046, still millions of kilometers away.

2010 GZ60 was originally estimated by JPL to be a near-Earth asteroid approximately 2 kilometers (1.2 miles) in diameter. But is now known to be an asteroid from the inner region of the asteroid belt that does not get closer than 1.5 AU (220 million km) to Earth.

<span class="nowrap">2010 WC<sub>9</sub></span>

2010 WC9, unofficially designated ZJ99C60, is a sub-kilometer near-Earth asteroid of the Apollo group, approximately 100 meters (330 feet) in diameter. First observed for eleven days by the Catalina Sky Survey in 2010, the asteroid was recovered in May 2018 during its sub-lunar close encounter with Earth.

2007 FT3 (also written 2007 FT3) is a lost asteroid with a short observation arc of 1.2 days that can not be recovered with targeted observations and awaits serendipitous survey observations. It has a poorly constrained orbit and has not been seen since 2007. It was first observed on 20 March 2007 when the asteroid was estimated to be 0.19 ± 0.01 AU (28.4 ± 1.5 million km) from Earth and had a solar elongation of 107 degrees. 2007 FT3 is the fourth largest asteroid with better than a 1-in-2 million cumulative chance of impacting Earth after (29075) 1950 DA, 1979 XB, and 101955 Bennu. With a cumulative Palermo Technical Impact Hazard Scale of -2.93, the poorly known orbit and assumed size place 2007 FT3 fifth on an unconstrained listing of the Sentry Risk Table.

1979 XB is a lost asteroid with a short observation arc of 3.9 days that cannot be recovered with targeted observations and awaits serendipitous survey observations. It is classified as a near-Earth object and potentially hazardous asteroid of the Apollo group and is estimated to be 660 meters in diameter. The unnumbered minor planet has a poorly constrained orbit and has not been observed in 40 years. It has been listed on the Sentry Risk Table since the list started in 2002. With a cumulative Palermo Technical Impact Hazard Scale of −2.72, the poorly known orbit and assumed size place 1979 XB third on an unconstrained listing of the Sentry Risk Table.

<span class="nowrap">2020 CD<sub>3</sub></span> Temporary satellite of Earth

2020 CD3 (also 2020CD3 or CD3 for short) is a tiny near-Earth asteroid (or minimoon) that ordinarily orbits the Sun but makes close approaches to the Earth–Moon system, in which it can temporarily enter Earth orbit through temporary satellite capture (TSC). It was discovered at the Mount Lemmon Observatory by astronomers Theodore Pruyne and Kacper Wierzchoś on 15 February 2020, as part of the Mount Lemmon Survey or Catalina Sky Survey. The asteroid's discovery was announced by the Minor Planet Center on 25 February 2020, after subsequent observations have confirmed that it was orbiting Earth.

<span class="mw-page-title-main">2020 VV</span> Small risk–listed near-Earth asteroid

2020 VV is an Apollo near-Earth asteroid roughly 12 meters in diameter. On 20 November 2020, the asteroid had a 4.4% chance of impacting Earth on 12 October 2033 11:43 UT. As of mid-December 2020, the asteroid has a modest 61 day observation arc. The nominal Earth approach is on 17 October 2033 at a distance of 0.009 AU, but the line of variations (LOV) is only known with an accuracy of ±22 hours. The line of variations allows the asteroid to come as close as 0.006 AU or pass as far away as 0.01 AU. With a diameter range of 10–22 meters the asteroid could be as large as the Chelyabinsk meteor.

References

  1. ↑ "JPL Small-Body Database Browser: (2018 GE3)". Jet Propulsion Laboratory.
  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. 1 2 3 4 "2005TM173 Ephemerides for December 2018".
  5. 1 2 3 4 "Sentry: 2011 CF66 (archived)" (computed on 2017-04-07). Archived from the original on 2018-01-28.
  6. 1 2 3 4 5 6 "Sentry: 2008 EL68 (archived)" (computed on 2017-04-09). Archived from the original on 2018-01-28.
  7. 1 2 3 4 5 6 "Sentry: 2009 VZ39 (archived)" (computed on 2017-04-09). Archived from the original on 2018-01-29.
  8. 1 2 3 4 "Sentry: 2015 HV182 (archived)" (computed on 2017-04-06). Archived from the original on 2017-04-14. Retrieved 2020-03-22.
  9. ↑ "Sentry: 2008 JD33 (archived)" (computed on 2017-04-06). Archived from the original on 2018-01-29. Retrieved 2021-02-06.{{cite web}}: Check |url= value (help)
  10. ↑ "Sentry: 2008 EK68 (archived)" (computed on 2017-04-06). Archived from the original on 2018-01-29. Retrieved 2021-02-06.{{cite web}}: Check |url= value (help)
  11. ↑ "Sentry: 2005 ED224 (archived)" (computed on 2017-04-07). Archived from the original on 2018-01-28. Retrieved 2020-03-22.
  12. 1 2 3 4 5 6 7 8 9 "Sentry: 2008 EM68 (archived)" (computed on 2017-04-07). Archived from the original on 2018-01-28. Retrieved 2020-03-22.
  13. ↑ "Sentry: 2014 OY391 (archived)" (computed on 2017-04-08). Archived from the original on 2018-01-28. Retrieved 2020-03-22.
  14. ↑ "Sentry: 2014 MV67 (archived)" (computed on 2017-04-06). Archived from the original on 2018-01-28. Retrieved 2020-03-22.
  15. 1 2 "Sentry: 2014 HG196 (archived)" (computed on 2017-04-08). Archived from the original on 2018-01-29. Retrieved 2020-03-22.
  16. 1 2 3 4 "Sentry: 2016 AZ193 (archived)" (computed on 2017-04-06). Archived from the original on 2018-01-28. Retrieved 2020-03-22.
  17. ↑ "Sentry: 2008 US (archived)" (computed on 2017-04-07). Archived from the original on 2018-01-28. Retrieved 2021-02-06.{{cite web}}: Check |url= value (help)
  18. 1 2 3 4 5 6 "CNEOS Fireball and Bolide Data".
  19. ↑ "Sentry: 2008 UY91 (archived)" (computed on 2017-04-07). Archived from the original on 2018-01-29. Retrieved 2020-03-22.
  20. ↑ "Sentry: 2014 HD198 (archived)" (computed on 2017-04-07). Archived from the original on 2018-01-28. Retrieved 2020-03-22.
  21. ↑ "Sentry: 2008 LE (archived)" (computed on 2017-04-07). Archived from the original on 2018-01-29.
  22. 1 2 3 "Sentry: 2008 VS4 (archived)" (computed on 2017-04-08). Archived from the original on 2017-10-20.
  23. 1 2 3 "Sentry: 2014 LY21 (archived)" (computed on 2017-04-08). Archived from the original on 2018-01-28.
  24. ↑ "Sentry: 2015 ME131 (archived)" (computed on 2017-04-08). Archived from the original on 2017-07-31.
  25. ↑ "Sentry: 2015 HW182 (archived)" (computed on 2017-04-08). Archived from the original on 2018-01-29.
  26. ↑ "Sentry: 2015 HS182 (archived)" (computed on 2017-04-08). Archived from the original on 2013-08-19. Retrieved 2020-09-27.{{cite web}}: Check |url= value (help)
  27. ↑ "Sentry: 2009 FZ4 (archived)" (computed on 2017-04-07). Archived from the original on 2018-01-29. Retrieved 2020-03-22.
  28. ↑ "Sentry: 2016 JO38 (archived)" (computed on 2017-04-07). Archived from the original on 2018-01-29. Retrieved 2020-03-22.
  29. ↑ "Sentry: 2008 UM1 (archived)" (computed on 2017-04-07). Archived from the original on 2018-01-28. Retrieved 2020-03-22.
  30. 1 2 3 "Sentry: 2014 HR197 (archived)" (computed on 2017-04-09). Archived from the original on 2018-01-28. Retrieved 2020-03-22.
  31. ↑ "Sentry: 2008 VL (archived)" (computed on 2017-04-08). Archived from the original on 2018-01-29. Retrieved 2020-03-22.
  32. 1 2 "Sentry: 2010 VP139 (archived)" (computed on 2017-04-07). Archived from the original on 2018-01-29. Retrieved 2021-02-06.{{cite web}}: Check |url= value (help)
  33. ↑ "Sentry: 2010 XC (archived)" (computed on 2017-04-07). Archived from the original on 2018-01-28. Retrieved 2021-02-06.{{cite web}}: Check |url= value (help)
  34. 1 2 3 "Sentry: 2005 TM173 (archived)" (computed on 2017-04-08). Archived from the original on 2017-10-20. Retrieved 2020-03-22.
  35. ↑ "Sentry: 2010 WW8 (archived)" (computed on 2017-04-09). Archived from the original on 2018-01-28. Retrieved 2020-03-22.
  36. 1 2 3 4 "Sentry: 2014 JT79 (archived)" (computed on 2017-04-06). Archived from the original on 2018-01-29. Retrieved 2020-03-22.
  37. ↑ "Sentry: 2010 GZ60 (archived)" (computed on 2017-04-18). Archived from the original on 2017-10-20. Retrieved 2020-03-22.
  38. ↑ "Sentry: 2010 MY112 (archived)" (computed on 2017-04-08). Archived from the original on 2018-01-28.
  39. ↑ "Sentry: 2013 YB (archived)" (computed on 2017-04-08). Archived from the original on 2018-01-28.
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