List Of Asteroid Close Approaches To Earth In 2023
Below is the list of asteroids that have come close to Earth in 2023.
| Time of discovery of asteroids which passed within 1 lunar distance from Earth in 2023 | ||
| ||
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 2023. As most asteroids passing within a lunar distance are less than 40 meters in diameter, they generally are not detected until they are within several million km of Earth. Objects coming from the direction of the Sun may not be publicly announced until a few days after closest approach. For example, 2023 AC1 was first imaged six hours after closest approach, then confirmed by other observations, but not officially announced until 3.5 days after closest approach. 2023 MD4 that approached from the direction of the Sun was not first observed until 3.6 days after closest approach. The largest asteroid on this list that is risk–listed is 2023 SM5 at about 17 meters in diameter with a 3.5-day observation arc and a 1:91000 chance of Earth impact on 2118 September 24.
For reference, the radius of Earth is about 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.
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 | Discovery | Object | Nominal geocentric distance | Uncertainty region (3-sigma) | Approx. size (m) | (H) (abs. mag) | Closer approach to Moon | |
|---|---|---|---|---|---|---|---|---|
| (AU) | (Lunar distance) | |||||||
| 2023-01-12 | 2023-01-13 G96 Mt. Lemmon Survey | 2023 AC1 | 0.00163 AU (244,000 km; 152,000 mi) | 0.63 | ± 1083 km | 4.4–9.8 | 29.0 | — |
| 2023-01-12 | 2023-01-13 703 Catalina Sky Survey | 2023 AV | 0.000104 AU (15,600 km; 9,700 mi) | 0.04 | ± 393 km | 2.0–4.5 | 30.6 | — |
| 2023-01-21 | 2023-01-22 F52 Pan-STARRS 2 | 2023 BY2 | 0.00169 AU (253,000 km; 157,000 mi) | 0.66 | ± 283 km | 3.3–7.4 | 29.5 | ✓ |
| 2023-01-25 | 2023-01-27 G96 Mt. Lemmon Survey | 2023 BX5 | 0.00224 AU (335,000 km; 208,000 mi) | 0.87 | ± 642 km | 5.6–13 | 28.4 | — |
| 2023-01-25 | 2023-01-18 F52 Pan-STARRS 2 | 2023 BL1 | 0.00150 AU (224,000 km; 139,000 mi) | 0.58 | ± 236 km | 15–33 | 26.3 | — |
| 2023-01-26 | 2023-01-24 F52 Pan-STARRS 2 | 2023 BL2 | 0.00248 AU (371,000 km; 231,000 mi) | 0.97 | ± 474 km | 4.7–10 | 28.8 | — |
| 2023-01-27 | 2023-01-21 L51 Gennadiy Borisov | 2023 BU | 0.000067 AU (10,000 km; 6,200 mi) | 0.03 | ± 2 km | 3.4–7.5 | 29.5 | — |
| 2023-01-27 | 2023-01-26 G96 Mt. Lemmon Survey | 2023 BZ3 | 0.00188 AU (281,000 km; 175,000 mi) | 0.73 | ± 665 km | 4.1–9.1 | 29.1 | — |
| 2023-01-30 | 2023-02-01 M22 ATLAS South Africa | 2023 CK | 0.00070 AU (105,000 km; 65,000 mi) | 0.27 | ± 234 km | 11–24 | 27.0 | — |
| 2023-01-30 | 2023-01-29 K88 GINOP-KHK, Piszkesteto | 2023 BJ7 | 0.00248 AU (371,000 km; 231,000 mi) | 0.97 | ± 525 km | 4.7–10 | 28.8 | ✓ |
| 2023-02-09 | 2023-02-12 G96 Mt. Lemmon Survey | 2023 CG4 | 0.00184 AU (275,000 km; 171,000 mi) | 0.71 | ± 5086 km | 3.9–8.7 | 29.2 | — |
| 2023-02-13 | 2023-02-12 K88 GINOP-KHK, Piszkesteto | 2023 CX1 | Impact | Impact | Impact | 0.8–1.8 | 32.6 | — |
| 2023-02-25 | 2023-02-24 K88 GINOP-KHK, Piszkesteto | 2023 DR | 0.00051 AU (76,000 km; 47,000 mi) | 0.20 | ± 65 km | 2.8–6.3 | 29.9 | — |
| 2023-03-09 | 2023-03-10 703 Catalina Sky Survey | 2023 EN | 0.00091 AU (136,000 km; 85,000 mi) | 0.35 | ± 260 km | 6.7–15 | 28.0 | — |
| 2023-03-12 | 2023-03-14 G96 Mt. Lemmon Survey | 2023 ET2 | 0.00105 AU (157,000 km; 98,000 mi) | 0.41 | ± 3292 km | 2.1–4.7 | 30.5 | — |
| 2023-03-17 | 2023-03-13 M22 ATLAS South Africa | 2023 EY | 0.00160 AU (239,000 km; 149,000 mi) | 0.62 | ± 152 km | 12–26 | 26.8 | — |
| 2023-03-19 | 2023-03-17 I41 Palomar Mountain--ZTF | 2023 FO | 0.00231 AU (346,000 km; 215,000 mi) | 0.90 | ± 662 km | 3.5–7.9 | 29.4 | — |
| 2023-03-25 | 2023-03-26 F51 Pan-STARRS 1 | 2023 FN6 | 0.00152 AU (227,000 km; 141,000 mi) | 0.59 | ± 426 km | 4.1–9.1 | 29.1 | — |
| 2023-03-25 | 2023-02-27 950 La Palma | 2023 DZ2 | 0.00116 AU (174,000 km; 108,000 mi) | 0.45 | ± 27 km | 40–90 | 24.2 | — |
| 2023-03-30 | 2023-03-28 G96 Mt. Lemmon Survey | 2023 FH7 | 0.00111 AU (166,000 km; 103,000 mi) | 0.43 | ± 358 km | 4.7–11 | 28.7 | — |
| 2023-04-11 | 2023-04-11 K88 GINOP-KHK, Piszkesteto | 2023 GQ | 0.00089 AU (133,000 km; 83,000 mi) | 0.35 | ± 142 km | 5.5–12 | 28.4 | — |
| 2023-04-11 | 2023-04-14 F52 Pan-STARRS 2 | 2023 GP3 | 0.00173 AU (259,000 km; 161,000 mi) | 0.67 | ± 908 km | 5.1–11 | 28.6 | — |
| 2023-04-14 | 2023-04-16 W68 ATLAS Chile | 2023 HE | 0.00205 AU (307,000 km; 191,000 mi) | 0.80 | ± 719 km | 7.9–18 | 27.6 | — |
| 2023-04-15 | 2023-04-16 G96 Mt. Lemmon Survey | 2023 HZ | 0.00192 AU (287,000 km; 178,000 mi) | 0.75 | ± 1156 km | 4.1–9.3 | 29.0 | — |
| 2023-04-17 | 2023-04-16 G96 Mt. Lemmon Survey | 2023 HB | 0.00130 AU (194,000 km; 121,000 mi) | 0.51 | ± 754 km | 2.2–4.8 | 30.5 | — |
| 2023-04-18 | 2023-04-16 F52 Pan-STARRS 2 | 2023 HH | 0.00096 AU (144,000 km; 89,000 mi) | 0.37 | ± 153 km | 4.5–10 | 28.9 | — |
| 2023-04-18 | 2023-04-17 G96 Mt. Lemmon Survey | 2023 HT | 0.00096 AU (144,000 km; 89,000 mi) | 0.37 | ± 150 km | 2.7–6.1 | 29.9 | — |
| 2023-04-20 | 2023-04-17 G96 Mt. Lemmon Survey | 2023 HK | 0.00228 AU (341,000 km; 212,000 mi) | 0.89 | ± 655 km | 10–23 | 27.1 | ✓ |
| 2023-04-23 | 2023-04-22 G96 Mt. Lemmon Survey | 2023 HW3 | 0.00140 AU (209,000 km; 130,000 mi) | 0.54 | ± 261 km | 4.4–9.8 | 28.9 | — |
| 2023-04-30 | 2023-04-29 G96 Mt. Lemmon Survey | 2023 HD7 | 0.00155 AU (232,000 km; 144,000 mi) | 0.60 | ± 269 km | 5.2–12 | 28.5 | ✓ |
| 2023-05-09 | 2023-05-09 703 Catalina Sky Survey | 2023 JO | 0.00062 AU (93,000 km; 58,000 mi) | 0.24 | ± 3596 km | 3.9–8.8 | 29.1 | — |
| 2023-05-09 | 2023-05-08 703 Catalina Sky Survey | 2023 JF | 0.00214 AU (320,000 km; 199,000 mi) | 0.83 | ± 177 km | 8.2–18 | 27.6 | ✓ |
| 2023-05-12 | 2023-05-13 G96 Mt. Lemmon Survey | 2023 JA3 | 0.00088 AU (132,000 km; 82,000 mi) | 0.34 | ± 523 km | 3.1–6.9 | 29.7 | — |
| 2023-05-17 | 2023-05-19 G03 Capricornus Observatory, Csokako | 2023 KT | 0.00112 AU (168,000 km; 104,000 mi) | 0.43 | ± 279 km | 6.0–13 | 28.2 | — |
| 2023-05-22 | 2023-05-20 G96 Mt. Lemmon Survey | 2023 KS | 0.00157 AU (235,000 km; 146,000 mi) | 0.61 | ± 334 km | 8.0–18 | 27.6 | — |
| 2023-05-27 | 2023-05-28 703 Catalina Sky Survey | 2023 KK4 | 0.00231 AU (346,000 km; 215,000 mi) | 0.90 | ± 1419 km | 8.4–19 | 27.5 | — |
| 2023-05-27 | 2023-05-28 703 Catalina Sky Survey | 2023 KU4 | 0.00194 AU (290,000 km; 180,000 mi) | 0.76 | ± 627 km | 6.3–14 | 28.1 | ✓ |
| 2023-06-07 | 2023-06-07 703 Catalina Sky Survey | 2023 LC | 0.00181 AU (271,000 km; 168,000 mi) | 0.71 | ± 89 km | 5.1–11 | 28.6 | — |
| 2023-06-09 | 2023-06-10 W68 ATLAS Chile | 2023 LS | 0.00059 AU (88,000 km; 55,000 mi) | 0.23 | ± 49 km | 2.8–6.2 | 29.9 | — |
| 2023-06-13 | 2023-06-14 G96 Mt. Lemmon Survey | 2023 LP1 | 0.00171 AU (256,000 km; 159,000 mi) | 0.67 | ± 496 km | 3.1–7.0 | 29.6 | — |
| 2023-06-14 | 2023-06-10 F52 Pan-STARRS 2 | 2023 LZ | 0.00212 AU (317,000 km; 197,000 mi) | 0.83 | ± 612 km | 14–32 | 26.4 | — |
| 2023-06-15 | 2023-06-14 G96 Mt. Lemmon Survey | 2023 LM1 | 0.00074 AU (111,000 km; 69,000 mi) | 0.29 | ± 99 km | 5.5–12 | 28.4 | — |
| 2023-06-17 | 2023-06-15 F52 Pan-STARRS 2 | 2023 LE2 | 0.00105 AU (157,000 km; 98,000 mi) | 0.41 | ± 80 km | 2.6–5.8 | 30.1 | — |
| 2023-06-20 | 2023-06-21 F51 Pan-STARRS 1 | 2023 MB3 | 0.00105 AU (157,000 km; 98,000 mi) | 0.41 | ± 188 km | 2.8–6.3 | 29.9 | — |
| 2023-06-20 | 2023-06-24 W94 MAP, San Pedro de Atacama | 2023 MD4 | 0.00194 AU (290,000 km; 180,000 mi) | 0.75 | ± 1570 km | 13–28 | 26.6 | — |
| 2023-06-23 | 2023-06-22 G96 Mt. Lemmon Survey | 2023 MW2 | 0.00083 AU (124,000 km; 77,000 mi) | 0.32 | ± 62 km | 2.7–6.0 | 30.0 | — |
| 2023-06-24 | 2023-06-21 F51 Pan-STARRS 1 | 2023 ML3 | 0.00174 AU (260,000 km; 162,000 mi) | 0.68 | ± 315 km | 5.7–13 | 28.4 | — |
| 2023-06-25 | 2023-06-21 F51 Pan-STARRS 1 | 2023 MU2 | 0.00145 AU (217,000 km; 135,000 mi) | 0.57 | ± 102 km | 3.9–8.6 | 29.2 | — |
| 2023-07-05 | 2023-07-08 G96 Mt. Lemmon Survey | 2023 NO | 0.00255 AU (381,000 km; 237,000 mi) | 0.99 | ± 1915 km | 5.3–12 | 28.5 | — |
| 2023-07-13 | 2023-07-15 M22 ATLAS South Africa | 2023 NT1 | 0.00067 AU (100,000 km; 62,000 mi) | 0.26 | ± 135 km | 26–59 | 25.0 | — |
| 2023-08-18 | 2023-08-20 K88 GINOP-KHK, Piszkesteto | 2023 QY | 0.00045 AU (67,000 km; 42,000 mi) | 0.17 | ± 654 km | 5.1–11 | 28.6 | — |
| 2023-08-19 | 2023-08-20 K88 GINOP-KHK, Piszkesteto | 2023 QS1 | 0.00072 AU (108,000 km; 67,000 mi) | 0.28 | ± 115 km | 5.1–11 | 28.6 | — |
| 2023-08-20 | 2023-08-19 F51 Pan-STARRS 1 | 2023 QR | 0.00139 AU (208,000 km; 129,000 mi) | 0.54 | ± 241 km | 3.7–8.4 | 29.3 | — |
| 2023-09-05 | 2023-09-08 F51 Pan-STARRS 1 | 2023 RM16 | 0.00234 AU (350,000 km; 218,000 mi) | 0.91 | ± 832 km | 4.6–10 | 28.8 | — |
| 2023-09-07 | 2023-09-07 G96 Mt. Lemmon Survey | 2023 RS | 0.00007 AU (10,000 km; 6,500 mi) | 0.03 | ± 13 km | 0.9–2 | 32.2 | — |
| 2023-09-07 | 2023-09-10 W94 MAP, San Pedro de Atacama | 2023 RG22 | 0.00250 AU (374,000 km; 232,000 mi) | 0.97 | ± 7613 km | 16–32 | 26.1 | — |
| 2023-09-08 | 2023-09-09 G96 Mt. Lemmon Survey | 2023 RY2 | 0.00127 AU (190,000 km; 118,000 mi) | 0.49 | ± 431 km | 6–13 | 28.3 | — |
| 2023-09-09 | 2023-09-10 L51 Gennadiy Borisov | 2023 RK5 | 0.00188 AU (281,000 km; 175,000 mi) | 0.73 | ± 449 km | 4–9 | 29.1 | — |
| 2023-09-13 | 2023-09-11 F52 Pan-STARRS 2 | 2023 RR5 | 0.00139 AU (208,000 km; 129,000 mi) | 0.54 | ± 121 km | 5–11 | 28.7 | — |
| 2023-09-16 | 2023-09-18 G96 Mt. Lemmon Survey | 2023 SR5 | 0.00117 AU (175,000 km; 109,000 mi) | 0.45 | ± 1233 km | 5–11 | 28.6 | — |
| 2023-09-18 | 2023-09-19 G96 Mt. Lemmon Survey | 2023 SC2 | 0.00116 AU (174,000 km; 108,000 mi) | 0.45 | ± 411 km | 3.7–8.4 | 29.3 | — |
| 2023-09-20 | 2023-09-19 G96 Mt. Lemmon Survey | 2023 SN1 | 0.00222 AU (332,000 km; 206,000 mi) | 0.86 | ± 390 km | 3.7–8.2 | 29.3 | ✓ |
| 2023-09-20 | 2023-09-21 703 Catalina Sky Survey | 2023 SL5 | 0.00035 AU (52,000 km; 33,000 mi) | 0.14 | ± 206 km | 5–11 | 28.7 | — |
| 2023-09-23 | 2023-09-19 F52 Pan-STARRS 2 | 2023 SM5 | 0.00251 AU (375,000 km; 233,000 mi) | 0.98 | ± 1327 km | 14–30 | 26.5 | ✓ |
| 2023-09-24 | 2023-09-18 F52 Pan-STARRS 2 | 2023 SP3 | 0.00220 AU (329,000 km; 205,000 mi) | 0.86 | ± 247 km | 13–29 | 26.6 | — |
| 2023-09-25 | 2023-09-26 K88 GINOP-KHK, Piszkesteto | 2023 SH7 | 0.00036 AU (54,000 km; 33,000 mi) | 0.14 | ± 35 km | 1.3–2.8 | 31.6 | — |
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.
Absolute magnitude 30 and greater
(size of a person for comparison)
Absolute magnitude 29-30
Absolute magnitude 28-29
Absolute magnitude 27-28
Absolute magnitude 26-27
Absolute magnitude 25-26
Absolute magnitude less than 25 (largest)
- After closest approach: 0 (0.0%)
- < 24 hours before: 0 (0.0%)
- up to 7 days before: 0 (0.0%)
- > one week before: 1 (100.0%)
- > 7 weeks before: 0 (0.0%)
- > one year before: 0 (0.0%)
Notes
Beyond 1 LD
Below is an example list of near-Earth asteroids that nominally will pass more than 1 lunar distance (384,400 km or 0.00256 AU) from Earth in 2023. During 2022, over 1,000 asteroids passed within 10 LD (3.8 million km) of Earth.
Rows highlighted grey indicate a planet or main-belt asteroid
Rows highlighted green indicate a comet which may have a larger uncertainty region due to non-gravitational forces from outgassing (sublimation).
It is also more difficult to make astrometric measurements of the precise location of the nucleus because it is masked by a fuzzy coma.
Rows highlighted yellow indicate short arc objects that have not been observed for years and therefore the uncertainty in the approach distance and date are large
Rows highlighted cyan indicate objects that had a short observation arc with large uncertainties that were recovered and their orbits greatly refined
Rows highlighted red indicate objects which are risk–listed with a virtual impactor near this date
| Object | Size (meters) | Nearest approach (lunar distances) | Date | Ref |
|---|---|---|---|---|
| 2022 YY6 | 16-35 | 2.1 | 2023-01-02 | JPL · CAD |
| 2014 LJ | 5.3-12 | 3.9–12.2 (4.7 LD nominal) | 2023-01-14? | JPL · CAD |
| 2012 BV13 | 100-220 | 12.11 | 2023-01-16 | JPL · CAD |
| 2020 BP | 19-43 | 9.26 | 2023-01-19 | JPL · CAD |
| C/2022 E3 (ZTF) | ≈1,000?? | 110.5 | 2023-02-01 | JPL · CAD |
| (367789) 2011 AG5 | 110–250 | 4.73 | 2023-02-03 | JPL · CAD |
| (199145) 2005 YY128 | 580-1300 | 11.96 | 2023-02-16 | JPL · CAD |
| 2023 DW | 37-82 | 22.7 | 2023-02-18 | JPL · CAD |
| 2020 DG4 | 6-14 | 1.62 | 2023-02-18 | JPL · CAD |
| (37638) 1993 VB | 370-820 | 16.98 | 2023-02-21 | JPL · CAD |
| 405 Thia (MBA) | 109,000 | 411.5 | 2023-03-20 | JPL |
| 2023 FM | 130-280 | 7.8 | 2023-04-06 | JPL · CAD |
| 364P/PANSTARRS | ≈300? | 46.98 | 2023-04-07 | JPL · CAD |
| 4486 Mithra | 1,850 | 63.31 | 2023-04-11 | JPL · CAD |
| (436774) 2012 KY3 | 540–1200 | 12.4 | 2023-04-13 | JPL · CAD |
| 2006 HV5 | 300 | 6.29 | 2023-04-26 | JPL · CAD |
| 1627 Ivar | 9,120 | 289.6 | 2023-04-29 | JPL |
| Planet Mercury | — | 217.7 | 2023-05-04 | JPL |
| 453 Tea (MBA) | 24,000 | 366.3 | 2023-05-05 | JPL |
| 2012 KP24 | 14-31 | 0.19–24 (10 LD nominal) | 2023-05-31? | JPL · CAD |
| 2016 LP10 | 4-8 | Impact–600 (245 LD nominal) | 2023-06-10? | Nominal |
| (488453) 1994 XD | 600 | 8.23 | 2023-06-12 | JPL · CAD |
| 2020 DB5 | 380-850 | 11.2 | 2023-06-15 | JPL · CAD |
| (467336) 2002 LT38 | 200–450 | 17.32 | 2023-06-24 | JPL · CAD |
| 2023 HO6 | 180-390 | 5.3 | 2023-07-05 | JPL · CAD |
| 2019 LH5 | 210-470 | 14.89 | 2023-07-07 | JPL · CAD |
| 237P/LINEAR | 414.1 | 2023-07-08 | JPL | |
| 2018 UY | 180-410 | 7.41 | 2023-07-12 | JPL · CAD |
| (490684) 2010 LL34 | 350-780 | 30.04 | 2023-07-13 | JPL · CAD |
| C/2021 T4 (Lemmon) | 210.6 | 2023-07-20 | JPL | |
| 2019 GL5 | 260 | 20.82 | 2023-07-29 | JPL · CAD |
| 2006 AD | 1585 | 68.39 | 2023-07-29 | JPL · CAD |
| Planet Venus | — | 112.4 | 2023-08-13 | JPL |
| 4769 Castalia | 1,400 | 42.82 | 2023-08-22 | JPL · CAD |
| 8 Flora (MBA) | 147,000 | 387.1 | 2023-09-02 | JPL |
| 2016 LY48 | 77-170 | 5.01 | 2023-09-16 | JPL · CAD |
| (523598) 2003 ED50 | 231 | 19.75 | 2023-09-20 | JPL · CAD |
| 103P/Hartley | ≈2,000 | 148.9 | 2023-09-26 | JPL · CAD |
| 2022 UX1 | 7-15 | 1.9–5.2 (3.1 LD nominal) | 2023-10-12 | JPL · CAD |
| 2021 NT14 | 245 | 18.54 | 2023-10-13 | JPL · CAD |
| 1998 HH49 | 140-320 | 3.05 | 2023-10-17 | JPL · CAD |
| 4544 Xanthus | 1,300 | 76.10 | 2023-10-21 | JPL · CAD |
| 18 Melpomene (MBA) | 140,000 | 334.2 | 2023-10-30 | JPL |
| (525229) 2004 UU1 | 150–330 | 10.61 | 2023-10-30 | JPL · CAD |
| (363505) 2003 UC20 | 1,900 | 13.66 | 2023-11-02 | JPL · CAD |
| (164121) 2003 YT1 | 1,720 | 23.10 | 2023-11-03 | JPL · CAD |
| C/2023 H2 (Lemmon) | 75 | 2023-11-10 | JPL · CAD | |
| (7350) 1993 VA | 1,900 | 50.36 | 2023-11-14 | JPL · CAD |
| (341843) 2008 EV5 | 400 | 16.4 | 2023-12-20 | JPL · CAD |
| 2020 YO3 | 30-70 | 0.5–30 (3.5 LD nominal) | 2023-12-23? | JPL · CAD |
Notes
See also
References
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