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List of asteroid close approaches to Earth in 2018

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Time of discovery of asteroids which came closer to Earth than the Moon in 2018
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%)
  •   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%)
Other Years
2016, 2017, 2018, 2019, 2020
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.

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

[edit]

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]
2018-01-02 2018-01-04 2018 AH 0.00199 AU (298,000 km; 185,000 mi) 0.77[note 4] 84–190 22.5 — data · 2018 AH
2018-01-15 2018-01-17 2018 BW 0.00112 AU (168,000 km; 104,000 mi) 0.43 6–14 28.1 — data · 2018 BW
2018-01-16 2018-01-17 2018 BR1 0.000877 AU (131,200 km; 81,500 mi) 0.34 3–8 29.5 — data · 2018 BR1
2018-01-18 2018-01-18 2018 BD 0.000262 AU (39,200 km; 24,400 mi) 0.10 2–6 30.1 — data · 2018 BD
2018-01-19 2018-01-20 2018 BF3 0.00162 AU (242,000 km; 151,000 mi) 0.63 17–38 26.0 — data · 2018 BF3
2018-01-19 2018-01-17 2018 BC 0.00189 AU (283,000 km; 176,000 mi) 0.73 3–9 29.4 — data · 2018 BC
2018-01-19 2018-01-18 2018 BX 0.00188 AU (281,000 km; 175,000 mi) 0.73 4–9 29.1 — data · 2018 BX
2018-01-20 2018-01-24 2018 BL11 0.00203 AU (304,000 km; 189,000 mi) 0.79 5–13 28.3 ✓ data · 2018 BL11
2018-01-22 2018-01-22 A106fgF Potential Impact? 0.0011[note 5] 2–5 30.6 — Src
2018-01-24 2018-01-27 2018 BN6 0.00242 AU (362,000 km; 225,000 mi) 0.94 12–26 26.8 — data · 2018 BN6
2018-01-25 2018-01-26 ZB0A262 0.000401 AU (60,000 km; 37,300 mi) 0.16[note 6] 2–5 30.6 — Src
2018-02-04 2018-02-07 2018 CS1 0.00230 AU (344,000 km; 214,000 mi) 0.90 6–14 28.2 — data · 2018 CS1
2018-02-06 2018-02-07 2018 CF2 0.000650 AU (97,200 km; 60,400 mi) 0.25 6–15 28.0 — data · 2018 CF2
2018-02-06 2018-02-04 2018 CC 0.00126 AU (188,000 km; 117,000 mi) 0.49 13–28 26.6 — data · 2018 CC
2018-02-09 2018-02-08 2018 CN2 0.000467 AU (69,900 km; 43,400 mi) 0.18 7–16 27.8 — data · 2018 CN2
2018-02-09 2018-02-04 2018 CB 0.000466 AU (69,700 km; 43,300 mi) 0.18 18–39 25.9 — data · 2018 CB
2018-02-16 2018-02-10 2018 CD3 0.00237 AU (355,000 km; 220,000 mi) 0.92 5–11 28.6 — data · 2018 CD3
2018-02-21 2018-02-22 2018 DQ 0.000670 AU (100,200 km; 62,300 mi) 0.26 4–9 29.1 — data · 2018 DQ
2018-02-24 2018-02-26 2018 DN4 0.00141 AU (211,000 km; 131,000 mi) 0.55[note 7] 5–12 28.4 ? data · 2018 DN4
2018-02-25 2018-02-23 2018 DU 0.00190 AU (284,000 km; 177,000 mi) 0.74 5–13 28.3 — data · 2018 DU
2018-03-02 2018-02-26 2018 DV1 0.000748 AU (111,900 km; 69,500 mi) 0.29 5–12 28.4 — data · 2018 DV1
2018-03-14 2018-03-12 2018 EZ2 0.00144 AU (215,000 km; 134,000 mi) 0.56 13–28 26.6 ✓ data · 2018 EZ2
2018-03-17 2018-03-19 2018 FL29 0.00148 AU (221,000 km; 138,000 mi) 0.58 2–6 30.1 — data · 2018 FL29
2018-03-18 2018-03-21 2018 FE3 0.000979 AU (146,500 km; 91,000 mi) 0.38 9–22 27.2 — data · 2018 FE3
2018-03-19 2018-03-20 2018 FQ3 0.00187 AU (280,000 km; 174,000 mi) 0.73 5–11 28.6 — data · 2018 FQ3
2018-03-23 2018-03-21 2018 FZ3 0.00129 AU (193,000 km; 120,000 mi) 0.50 8–18 27.6 — data · 2018 FZ3
2018-03-30 2018-03-28 2018 FK5 0.00100 AU (150,000 km; 93,000 mi) 0.39 5–13 28.3 — data · 2018 FK5
2018-04-07 2018-04-11 2018 GR11 0.00177 AU (265,000 km; 165,000 mi) 0.69 6–12 28.5 — data · 2018 GR11
2018-04-10 2008-04-13 2008 GY21 aka
2018 GY3		 0.00201 AU (301,000 km; 187,000 mi) 0.78 8–18 27.6 — data · 2008 GY21
2018-04-12 2018-04-13 ZGBE54F 0.000469 AU (70,200 km; 43,600 mi) 0.18[note 8] 2–7 30.0 — Src
2018-04-12 2018-04-11 2018 GD2 0.00201 AU (301,000 km; 187,000 mi) 0.78 3–8 29.4 — data · 2018 GD2
2018-04-15 2018-04-14 2018 GE3 0.00129 AU (193,000 km; 120,000 mi) 0.50 46–100 23.8 ✓ data · 2018 GE3
2018-04-21 2018-04-23 2018 HW1 0.00229 AU (343,000 km; 213,000 mi) 0.89 18–41 25.8 — data · 2018 HW1
2018-04-22 2018-04-21 2018 HV 0.00103 AU (154,000 km; 96,000 mi) 0.40 4–10 28.9 — data · 2018 HV
2018-05-15 2010-11-30 2010 WC9 0.00136 AU (203,000 km; 126,000 mi) 0.53 51–110 23.6 — data · 2010 WC9
2018-05-23 2018-05-22 2018 KW1 0.000997 AU (149,100 km; 92,700 mi) 0.39 3–7 29.7 — data · 2018 KW1
2018-05-26 2018-05-24 2018 KY2 0.00200 AU (299,000 km; 186,000 mi) 0.78 9–22 27.2 — data · 2018 KY2
2018-06-02 2018-06-02 2018 LA 0.0000334 AU (5,000 km; 3,100 mi)
(Impact)		 0.0130
(Impact)[note 9]		 2–3 30.5 — data · 2018 LA
2018-06-15 2018-06-11 2018 LV3 0.00221 AU (331,000 km; 205,000 mi) 0.86 13–30 26.5 — data · 2018 LV3
2018-06-16 2018-06-17 2018 MZ4 0.00139 AU (208,000 km; 129,000 mi) 0.54 4–10 28.8 ✓ data · 2018 MZ4
2018-06-17 2018-06-17 A107j4q 0.000206 AU (30,800 km; 19,100 mi) 0.080[note 10] 4–11 28.9 — Src · diagram
2018-06-23 2018-06-24 A107pL2 0.000525 AU (78,500 km; 48,800 mi) 0.20[note 11] 3–9 29.5 — Src
2018-07-04 2018-07-05 ZN2E090 0.00132 AU (197,000 km; 123,000 mi) 0.51[note 12] 4–12 28.8 — Src
2018-07-07 2018-07-08 2018 NX 0.000783 AU (117,100 km; 72,800 mi) 0.30 7–17 27.7 — data · 2018 NX
2018-07-08 2018-07-08 2018 NW 0.000833 AU (124,600 km; 77,400 mi) 0.32 7–16 27.8 — data · 2018 NW
2018-08-10 2018-08-11 2018 PD20 0.000224 AU (33,500 km; 20,800 mi) 0.087 8–20 27.4 — data · 2018 PD20
2018-08-12 2018-08-13 A1080DC 0.000284 AU (42,500 km; 26,400 mi) 0.11[note 13] 1–4 31.3 — Src
2018-08-21 2018-08-21 2018 QR1 0.000592 AU (88,600 km; 55,000 mi) 0.23 8–20 27.4 — data · 2018 QR1
2018-09-03 2018-09-07 2018 RR1 0.00243 AU (364,000 km; 226,000 mi) 0.94 2–6 29.9 — data · 2018 RR1
2018-09-05 2018-09-06 2018 RS 0.000710 AU (106,200 km; 66,000 mi) 0.28 2–9 30.0 — data · 2018 RS
2018-09-06 2018-09-07 2018 RE2 0.00255 AU (381,000 km; 237,000 mi) 0.991 5–12 28.5 — data · 2018 RE2
2018-09-07 2018-09-09 2018 RJ3 0.00112 AU (168,000 km; 104,000 mi) 0.44 7–16 27.8 — data · 2018 RJ3
2018-09-08 2018-09-07 2018 RW 0.00114 AU (171,000 km; 106,000 mi) 0.44 2–5 30.3 — data · 2018 RW
2018-09-09 2018-09-03 2018 RC 0.00150 AU (224,000 km; 139,000 mi) 0.58 28–63 24.9 — data · 2018 RC
2018-09-12 2018-09-13 2018 RY5 0.00120 AU (180,000 km; 112,000 mi) 0.47 10–36 26.5 — data · 2018 RY5
2018-09-12 2018-09-13 2018 RZ5 0.000331 AU (49,500 km; 30,800 mi) 0.13 2–8 29.7 — data · 2018 RZ5
2018-09-15 2018-09-16 2018 SM 0.000285 AU (42,600 km; 26,500 mi) 0.11 3–9 29.4 — data · 2018 SM
2018-09-16 2018-09-18 2018 SN3 0.00131 AU (196,000 km; 122,000 mi) 0.51 2–7 29.9 — data · 2018 SN3
2018-09-18 2018-09-17 2018 SC 0.00179 AU (268,000 km; 166,000 mi) 0.70 5–19 27.9 — data · 2018 SC
2018-09-25 2018-09-21 2018 SD2 0.000587 AU (87,800 km; 54,600 mi) 0.23 4–12 28.6 — data · 2018 SD2
2018-09-30 2018-10-02 2018 TC 0.00204 AU (305,000 km; 190,000 mi) 0.79 10–31 26.6 — data · 2018 TC
2018-10-06 2018-10-05 2018 TV5 0.000682 AU (102,000 km; 63,400 mi) 0.27 3–9 29.5 — data · 2018 TV5
2018-10-06 2018-10-06 ZTF01Z9 0.00170 AU (254,000 km; 158,000 mi) 0.66[note 14] 4–12 28.8 — Src
2018-10-07 2018-10-05 2018 TV 0.00190 AU (284,000 km; 177,000 mi) 0.74 4–13 28.6 — data · 2018 TV
2018-10-17 2018-10-18 2018 UL 0.00148 AU (221,000 km; 138,000 mi) 0.57 3–11 29.1 ✓ data · 2018 UL
2018-10-19 2018-10-19 2018 UA 0.0000914 AU (13,670 km; 8,500 mi) 0.036 2–6 30.2 — data · 2018 UA
2018-11-01 2018-11-01 2018 VQ10 0.000276 AU (41,300 km; 25,700 mi) 0.11[note 15] 2–5 30.6 — Temp. src
2018-11-02 2018-11-03 2018 VP1 0.00101 AU (151,000 km; 94,000 mi) 0.39 1–5 30.8 — data · 2018 VP1
2018-11-05 2018-11-08 2018 VT5 0.00123 AU (184,000 km; 114,000 mi) 0.48 4–16 28.3 — data · 2018 VT5
2018-11-06 2018-11-07 2018 VO5 0.000942 AU (140,900 km; 87,600 mi) 0.37 9–33 26.7 — data · 2018 VO5
2018-11-10 2018-11-04 2018 VX1 aka
2018 VA6		 0.00255 AU (381,000 km; 237,000 mi) 0.994 6–22 27.5 — data · 2018 VX1
2018-11-11 2018-11-11 2018 VS10 0.00103 AU (154,000 km; 96,000 mi) 0.40 3–10 29.1 — Temp. src
2018-11-13 2018-11-10 2018 VC7 0.00224 AU (335,000 km; 208,000 mi) 0.87 7–23 27.4 — data · 2018 VC7
2018-11-13 2018-11-16 2018 WA1 0.00168 AU (251,000 km; 156,000 mi) 0.65 2–7 30.0 — data · 2018 WA1
2018-11-14 2018-11-15 2018 VJ10 0.00133 AU (199,000 km; 124,000 mi) 0.52 4–12 28.6 ✓ data · 2018 VJ10
2018-11-15 2018-11-17 ZW84BCD 0.000845 AU (126,400 km; 78,500 mi) 0.33[note 16] 2–7 30.0 — Src
2018-11-16 2018-11-17 ZW87F01 0.000594 AU (88,900 km; 55,200 mi) 0.23[note 17] 1–2 32.3 — Src
2018-11-16 2018-11-17 2018 WH 0.00127 AU (190,000 km; 118,000 mi) 0.50 2–8 29.8 — data · 2018 WH
2018-11-16 2018-11-17 2018 WG 0.000206 AU (30,800 km; 19,100 mi) 0.080 3–10 29.3 — data · 2018 WG
2018-11-18 2018-11-17 2018 WE 0.00160 AU (239,000 km; 149,000 mi) 0.62 4–16 28.3 ✓ data · 2018 WE
2018-11-19 2018-11-17 2018 WJ 0.000794 AU (118,800 km; 73,800 mi) 0.31 6–26 27.5 — data · 2018 WJ
2018-11-25 2018-11-26 2018 WE1 0.000715 AU (107,000 km; 66,500 mi) 0.28 12–51 26.0 — data · 2018 WE1
2018-11-27 2018-11-28 2018 WZ1 0.000729 AU (109,100 km; 67,800 mi) 0.28 3–9 29.4 — data · 2018 WZ1
2018-11-28 2018-11-29 2018 WA3 0.00216 AU (323,000 km; 201,000 mi) 0.84 5–20 27.8 — data · 2018 WA3
2018-11-28 2018-11-29 ZW900BE 0.000224 AU (33,500 km; 20,800 mi) 0.087[note 18] 1–4 31.2 — Src
2018-11-30 2018-11-29 2018 WG2 0.00134 AU (200,000 km; 125,000 mi) 0.52 2–7 30.1 — data · 2018 WG2
2018-12-02 2018-11-29 2018 WV1 0.000221 AU (33,100 km; 20,500 mi) 0.086 2–6 30.2 — data · 2018 WV1
2018-12-11 2018-12-13 2018 XA4 0.00249 AU (372,000 km; 231,000 mi) 0.97 3–11 29.1 ✓ data · 2018 XA4
2018-12-27 2018-12-28 2018 YL2 0.000398 AU (59,500 km; 37,000 mi) 0.15 3–10 29.3 — data · 2018 YL2
2018-12-28 2018-12-29 2018 YO2 0.00131 AU (196,000 km; 122,000 mi) 0.51 2–6 29.8 — data · 2018 YO2
2018-12-28 2019-01-03 2019 AW2 0.00110 AU (165,000 km; 102,000 mi) 0.43 22–69 25.1 — data · 2019 AW2
2018-12-30 2018-12-31 2018 YJ4 0.000725 AU (108,500 km; 67,400 mi) 0.28 2–7 29.8 — Temp. src

Warning Times by Size

[edit]

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

(size of a person for comparison)

After 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

After 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

After 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

After 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

After 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

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 less than 25 (largest)

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%)
  •   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

[edit]
  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

[edit]

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:

  • Asteroids that come closer to Earth are a higher priority to confirm, and only confirmed asteroids are listed with a lunocentric approach distance.
  • Those that closely approach the Moon are frequently lost in its glare, making them harder to confirm. They are similarly hard to discover during the new moon, when the Moon is too close to the Sun to detect asteroids while they are near the Moon.

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
2018-01-15 2018 BW 0.00212 AU (317,000 km; 197,000 mi) 0.82 5–17 28.1 0.43 data · 2018 BW
2018-01-19 2018 BD 0.00123 AU (184,000 km; 114,000 mi) 0.48 2–6 30.2 0.10 data · 2018 BD
2018-01-20 2018 BL11 0.00186 AU (278,000 km; 173,000 mi) 0.72 5–15 28.3 0.79 data · 2018 BL11
2018-01-24 ZB0A262 0.00148 AU (221,000 km; 138,000 mi) 0.57[note2 2] 2–5 30.6 0.16 Src
2018-02-03 2018 CT 0.00249 AU (372,000 km; 231,000 mi) 0.97 15–47 25.8 1.69 data · 2018 CT
2018-02-06 2018 CF2 0.00204 AU (305,000 km; 190,000 mi) 0.79 4–20 28.0 0.25 data · 2018 CF2
2018-02-24 2018 DN4 0.00128 AU (191,000 km; 119,000 mi) 0.50[note2 3] 4–14 28.4 0.55 data · 2018 DN4
2018-03-01 2018 DV1 0.000893 AU (133,600 km; 83,000 mi) 0.35 4–15 28.4 0.29 data · 2018 CD1
2018-03-14 2018 EZ2 0.00136 AU (203,000 km; 126,000 mi) 0.53 10–34 26.5 0.56 data · 2018 EZ2
2018-03-17 2018 FL29 0.00187 AU (280,000 km; 174,000 mi) 0.73 2–7 30.1 0.58 data · 2018 FL29
2018-03-17 2018 FE3 0.00118 AU (177,000 km; 110,000 mi) 0.46 8–27 27.1 0.38 data · 2018 FE3
2018-03-30 2018 FK5 0.00157 AU (235,000 km; 146,000 mi) 0.61 4–16 28.3 0.39 data · 2018 FK5
2018-04-13 2018 GD2 0.00221 AU (331,000 km; 205,000 mi) 0.86 3–9 29.4 0.78 data · 2018 GD2
2018-04-15 2018 GE3 0.000876 AU (131,000 km; 81,400 mi) 0.34 37–138 23.6 0.50 data · 2018 GE3
2018-05-23 2018 KW1 0.00146 AU (218,000 km; 136,000 mi) 0.57 3–8 29.7 0.39 data · 2018 KW1
2018-06-02 2018 LA 0.00208 AU (311,000 km; 193,000 mi) 0.83 2–3 30.5 Impact data · 2018 LA
2018-06-16 2018 MZ4 0.000527 AU (78,800 km; 49,000 mi) 0.20 4–11 28.8 0.54 data · 2018 MZ4
2018-06-17 A107j4p 0.00256 AU (383,000 km; 238,000 mi) 0.995[note2 4] 4–11 28.9 0.080 Src
2018-06-23 A107pL2 0.00208 AU (311,000 km; 193,000 mi) 0.81[note2 5] 3–9 29.5 0.20 Src
2018-07-02 2018 NH 0.00109 AU (163,000 km; 101,000 mi) 0.43 24–88 24.6 1.13 data · 2018 NH
2018-07-05 ZN2E090 0.00168 AU (251,000 km; 156,000 mi) 0.65[note2 6] 4–12 28.8 0.51 Src
2018-07-07 2018 NX 0.00152 AU (227,000 km; 141,000 mi) 0.59 7–18 27.7 0.30 data · 2018 NX
2018-07-08 2018 NW 0.00165 AU (247,000 km; 153,000 mi) 0.64 6–18 27.8 0.32 data · 2018 NW
2018-07-24 2018 OF2 0.000713 AU (106,700 km; 66,300 mi) 0.28 8–21 27.4 1.14 data · 2018 OF2
2018-08-04 2018 PY7 0.00182 AU (272,000 km; 169,000 mi) 0.71 9–33 26.7 1.07 data · 2018 PY7
2018-08-10 2018 PD20 0.00117 AU (175,000 km; 109,000 mi) 0.46 7–22 27.4 0.087 data · 2018 PD20
2018-08-12 2018 OF2 0.00178 AU (266,000 km; 165,000 mi) 0.69 1–4 31.3 0.11 data · 2018 OF2
2018-08-15 2018 PY23 0.00117 AU (175,000 km; 109,000 mi) 0.45 6–17 27.9 1.32 data · 2018 PY23
2018-08-19 ZTF00VP 0.00149 AU (223,000 km; 139,000 mi) 0.58[note2 7] 3–11 29.0 1.12 Src
2018-09-03 2018 RR1 0.00254 AU (380,000 km; 236,000 mi) 0.990 2–7 29.8 0.95 data · 2018 RR1
2018-09-05 2018 RS 0.00220 AU (329,000 km; 205,000 mi) 0.85 2–12 29.5 0.28 data · 2018 RS
2018-09-07 2018 RJ3 0.00200 AU (299,000 km; 186,000 mi) 0.78 6–19 27.8 0.44 data · 2018 RJ3
2018-09-08 2018 RW 0.00256 AU (383,000 km; 238,000 mi) 0.997 2–7 30.3 0.44 data · 2018 RW
2018-09-10 2018 RC 0.00244 AU (365,000 km; 227,000 mi) 0.95 23–87 24.6 0.58 data · 2018 RC
2018-09-12 2018 RZ5 0.00134 AU (200,000 km; 125,000 mi) 0.52 2-8 29.7 0.13 data · 2018 RZ5
2018-09-15 2018 SM 0.00188 AU (281,000 km; 175,000 mi) 0.73 3-9 29.4 0.11 data · 2018 SM
2018-09-15 2018 SN3 0.00229 AU (343,000 km; 213,000 mi) 0.89 2–7 29.9 0.51 data · 2018 SN3
2018-09-19 2018 RF8 0.00154 AU (230,000 km; 143,000 mi) 0.60 14–50 25.8 1.37 data · 2018 RF8
2018-09-24 2018 SD2 0.00193 AU (289,000 km; 179,000 mi) 0.75 4-12 28.6 0.23 data · 2018 SD2
2018-10-06 2018 TV5 0.000749 AU (112,000 km; 69,600 mi) 0.29 3–9 29.5 0.27 data · 2018 TV5
2018-10-17 2018 UL 0.000992 AU (148,400 km; 92,200 mi) 0.39 3–11 29.1 0.57 data · 2018 UL
2018-10-19 2018 UA 0.00189 AU (283,000 km; 176,000 mi) 0.74 2–6 30.2 0.036 data · 2018 UA
2018-11-01 2018 VQ10 0.00215 AU (322,000 km; 200,000 mi) 0.84 2–5 30.6 0.11 Temp. Src
2018-11-03 2018 VV3 0.00131 AU (196,000 km; 122,000 mi) 0.51 13–36 26.2 1.13 data · 2018 VV3
2018-11-04 2018 WS 0.00212 AU (317,000 km; 197,000 mi) 0.89 11–34 26.5 1.74 data · 2018 WS
2018-11-05 2018 VO5 0.00247 AU (370,000 km; 230,000 mi) 0.96 9–33 26.7 0.37 data · 2018 VO5
2018-11-06 ZV33FBC 0.00147 AU (220,000 km; 137,000 mi) 0.57[note2 8] 9–28 26.9 0.57 Src
2018-11-14 2018 VJ10 0.00124 AU (186,000 km; 115,000 mi) 0.48 4–12 28.6 0.52 data · 2018 VJ10
2018-11-15 2018 WA1 0.00243 AU (364,000 km; 226,000 mi) 0.95 2–7 30.0 0.65 data · 2018 WA1
2018-11-15 ZW87F01 0.00195 AU (292,000 km; 181,000 mi) 0.76[note2 9] 1–2 32.3 0.23 Src
2018-11-16 2018 WH 0.00215 AU (322,000 km; 200,000 mi) 0.83 2–8 29.8 0.50 data · 2018 WH
2018-11-18 2018 WE 0.00133 AU (199,000 km; 124,000 mi) 0.52 4–16 28.3 0.62 data · 2018 WE
2018-11-19 2018 WJ 0.00228 AU (341,000 km; 212,000 mi) 0.89 6–26 27.5 0.31 data · 2018 WJ
2018-11-25 2018 WE1 0.00142 AU (212,000 km; 132,000 mi) 0.55 12–51 26.0 0.28 data · 2018 WE1
2018-11-25 ZTF01p2 0.00246 AU (368,000 km; 229,000 mi) 0.96[note2 10] 10–31 26.7 1.47 Src
2018-11-25 2018 WH1 0.00197 AU (295,000 km; 183,000 mi) 0.77 4–14 28.5 1.18 data · 2018 WH1
2018-11-27 2018 WZ1 0.00225 AU (337,000 km; 209,000 mi) 0.88 3–9 29.4 0.28 data · 2018 WZ1
2018-11-28 ZW900BE 0.00255 AU (381,000 km; 237,000 mi) 0.993[note2 11] 1–4 31.2 0.087 Src
2018-12-05 2018 WV1 0.00225 AU (337,000 km; 209,000 mi) 0.88 2–6 30.2 0.086 data · 2018 WV1
2018-12-08 2018 XP2 0.00176 AU (263,000 km; 164,000 mi) 0.68 5–16 28.1 1.009 data · 2018 XP2
2018-12-11 2018 XA4 0.00158 AU (236,000 km; 147,000 mi) 0.61 3–11 29.1 0.97 data · 2018 XA4
2018-12-27 2018 YL2 0.00131 AU (196,000 km; 122,000 mi) 0.51 3–10 29.3 0.15 data · 2018 YL2
2018-12-30 2018 YJ4 0.000253 AU (37,800 km; 23,500 mi) 0.98 2–7 29.8 0.28 Temp. src

Notes

[edit]
  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

[edit]
Radar images of binary asteroid 2017 YE5 upon close approach in June 2018
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.

Object Size
meters 		lunar
distances 		Date Ref
(276033) 2002 AJ129 624 10.9 2018-02-04 JPL
3752 Camillo 2306 53.6 2018-02-20 JPL
2017 VR12 271 3.76 2018-03-07 JPL
1981 Midas 3400 34.9 2018-03-21 JPL
2018 GU1 46 1.70 2018-04-08 JPL
(388945) 2008 TZ3 285 6.48 2018-05-09 JPL
(68347) 2001 KB67 359 9.50 2018-05-29 JPL
2017 YE5 860 15.5 2018-06-21 JPL
2018 NL 32 1.42 2018-06-28 JPL
(4953) 1990 MU 2800 41.6 2018-11-29 JPL
2013 VX4 62 4.09 2018-12-09 JPL
(163899) 2003 SD220 800 7.36 2018-12-22 JPL

Statistics

[edit]
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

[edit]

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.

Date Object Estimated
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] 9 0.18 2,100,000,000 0.994 -7.87 1.1 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] 9 0.071 370,000,000 0.039 -8.38 1.3 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 CF66 9 0.18 100,000,000 -2.100 -7.70 1.2 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 CF66 9 0.18 140,000,000 -1.183 -7.82 1.2 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 CF66 9 0.18 120,000,000 -0.465 -7.67 1.2 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] 9 0.043 110,000,000 0.948 -7.63 2.7 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 EL68 9 0.071 2,000,000 -0.690 -6.26 1.3 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] 157 1.0 2,100,000,000 0.096 -5.47 2.4 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 JD33 9 0.12 290,000,000 -2.389 -8.34 0.95 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 EK68 4 0.040 1,100,000,000 0.697 -9.01 2.9 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 EL68 9 0.071 1,700,000,000 1.232 -8.05 1.4 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 EL68 9 0.071 1,100,000,000 0.806 -8.35 1.4 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 54 3.1 2,400,000 1.438 -3.72 1.6 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 EL68 9 0.071 2,900,000 0.544 -6.01 1.4 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] 10 0.11 3,400,000 1.198 -6.09 2.7 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 OY391 22 0.97 2,000,000,000 3.436 -7.94 3.4 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 537 0.93 1,900,000,000 0.195 -4.68 3.8 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] 16 1.0 1,900,000,000 0.196 -8.19 3.0 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] 19 0.16 91,000,000 0.155 -6.86 0.63 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 US 2 0.081 240,000 0.253 -6.56 1.0 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)		 4 N/A 1 0.000 0 N/A
(impact)		 N/A
(impact)
2018-04-24[19] 2008 UY91 36 0.12 310,000,000 0.687 -6.63 3.8 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 AZ193 19 0.16 210,000,000 -0.099 -7.67 0.72 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 HD198 4 0.97 710,000 -1.705 -6.18 3.7 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 LE 22 0.14 270,000,000 -0.137 -7.01 2.3 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 VZ39 9 0.043 210,000,000 1.159 -7.45 1.9 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] 49 0.083 480,000,000 1.108 -6.64 2.3 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 3 0.16 1 0.000 >0 0.00004 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] 5 0.045 910,000 -0.349 -5.67 1.1 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 LY21 5 0.045 670,000 0.067 -6.10 1.1 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 LY21 5 0.045 340,000,000 0.474 -9.17 1.1 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)		 5 N/A 1 0.000 0 N/A
(impact)		 N/A
(impact)
2018-06-22[8] 2015 HV182 157 1.0 500,000,000 -0.333 -5.62 1.9 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)		 3 N/A 1 0.000 0 N/A
(impact)		 N/A
(impact)
2018-08-12[15] 2014 HG196 16 1.0 310,000,000 -0.816 -7.79 1.8 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 499 1.8 560,000,000 0.768 -4.13 1.3 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 EM68 10 0.11 6,200,000,000 2.277 -9.63 2.8 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 EM68 10 0.11 170,000,000 1.084 -7.95 2.7 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 EM68 10 0.11 91,000,000 0.297 -7.56 2.7 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 EM68 10 0.11 120,000,000 -0.315 -7.56 2.7 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 EM68 10 0.11 710,000,000 -1.258 -8.14 2.7 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 EM68 10 0.11 220,000,000 -0.824 -7.72 2.7 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 EM68 10 0.11 7,700,000,000 -2.041 -8.91 2.7 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 EM68 10 0.11 1,800,000,000 -1.660 -8.39 2.7 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 HW182 31 1.0 1,400,000,000 -1.839 -7.55 1.3 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 HS182 23 3.0 1,100,000,000 1.918 -7.98 3.0 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 HV182 157 1.0 770,000,000 -0.337 -5.87 2.3 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 FZ4 31 0.60 14,000,000 0.453 -5.77 1.3 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)		 4 N/A 1 0.000 0 N/A
(impact)		 N/A
(impact)
2018-09-26[8] 2015 HV182 157 1.0 2,400,000,000 0.029 -6.09 2.4 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 JO38 37 0.97 53,000,000 0.328 -6.08 3.9 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 UM1 2 0.031 3,300,000,000 -0.299 -11.2 4.8 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] 14 0.96 2,100,000,000 -1.613 -8.25 1.2 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 HR197 14 0.96 500,000,000 -0.177 -7.92 1.2 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 HR197 14 0.96 8,300,000,000 1.972 -9.43 1.2 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 VL 9 0.12 710,000,000 1.279 -8.27 4.5 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 VZ39 9 0.043 77,000,000 -0.297 -7.79 0.29 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 VZ39 9 0.043 770,000,000 -0.704 -8.26 0.29 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] 6 0.046 56,000,000 0.822 -8.27 0.44 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 VZ39 9 0.043 32,000,000 0.008 -7.61 0.29 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 6 0.046 1,900,000,000 2.113 -9.46 0.44 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 VZ39 9 0.043 67,000,000 0.981 -7.60 0.28 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 VS4 49 0.083 10,000,000,000 1.753 -7.73 3.4 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)		 3 N/A 1 0.000 0 N/A
(impact)		 N/A
(impact)
2018-11-29[22] 2008 VS4 49 0.083 1,300,000,000 0.856 -7.42 3.4 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 XC 5 0.058 40,000,000 -0.250 -8.27 2.4 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] 51 1.9 2,000,000,000 0.455 -7.48 5.3 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 WW8 18 0.066 710,000,000 1.218 -7.87 2.9 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] 13 2.8 830,000,000 0.401 -7.75 3.1 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 TM173 51 1.9 450,000,000 -0.856 -6.64 5.3 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 JT79 13 2.8 230,000,000 0.147 -7.53 3.1 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 JT79 13 2.8 91,000,000 -0.252 -7.51 3.1 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 MY112 231 1.4 1,000,000,000 -0.262 -5.14 3.4 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)		 12 N/A 1 0.000 0 N/A
(impact)		 N/A
(impact)
2018-12-20[34] 2005 TM173 51 1.9 3,400,000,000 -1.991 -7.29 5.3 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 JT79 13 2.8 200,000,000 -1.085 -8.38 3.1 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 YB 2 0.16 17,000,000 3.754 -9.06 2.3 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 EL68 9 0.071 3,200,000,000 -0.855 -9.74 1.4 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 AZ193 19 0.16 2,800,000,000 0.411 -8.06 1.4 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 AZ193 19 0.16 6,200,000,000 0.502 -8.22 1.4 AU (210,000,000 km; 130,000,000 mi) 1.3 AU (190,000,000 km; 120,000,000 mi)

Notes

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  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

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References

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  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. ^ a b c d "2005TM173 Ephemerides for December 2018".
  5. ^ a b c d "Sentry: 2011 CF66 (archived)" (computed on 2017-04-07). Archived from the original on 2018-01-28.
  6. ^ a b c d e f "Sentry: 2008 EL68 (archived)" (computed on 2017-04-09). Archived from the original on 2018-01-28.
  7. ^ a b c d e f "Sentry: 2009 VZ39 (archived)" (computed on 2017-04-09). Archived from the original on 2018-01-29.
  8. ^ a b c d "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. ^ a b c d e f g h i "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. ^ a b "Sentry: 2014 HG196 (archived)" (computed on 2017-04-08). Archived from the original on 2018-01-29. Retrieved 2020-03-22.
  16. ^ a b c d "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. ^ a b c d e f "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. ^ a b c "Sentry: 2008 VS4 (archived)" (computed on 2017-04-08). Archived from the original on 2017-10-20.
  23. ^ a b c "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. ^ a b c "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. ^ a b "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. ^ a b c "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. ^ a b c d "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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