# List of asteroid close approaches to Earth in 2013

Below is the list of asteroid close approaches to Earth in 2013. This was the year of the Chelyabinsk impact, in addition to the other NEO flybys

## Timeline of known close approaches less than one lunar distance from Earth in 2013

A list of known Near-Earth asteroid close approaches less than 1 lunar distance (384,400 km or 0.00257 AU) from Earth in 2013, based on the close approach database of the Center for Near-Earth Object Studies (CNEOS).
The CNEOS database of close approaches lists some close approaches a full orbit or more before the discovery of the object, derived by orbit calculation. The list below only includes close approaches that are evidenced by observations, thus the pre-discovery close approaches would only be included if the object was found by precovery, but there was no such close approach in 2013.
This list and relevant databases do not consider impacts as close approaches, thus the list does not include any of the 24 objects that collided with Earth's atmosphere in 2013, none of which were discovered in advance, but were observed visually or recorded by sensors designed to detect detonation of nuclear devices. Of the 24 objects so detected, 5 had an impact energy greater than that of a 1 kiloton device including the 440 kiloton Chelyabinsk meteor, estimated at 20 m in diameter, which injured around 1500 people and damaged over 7000 buildings.
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) | Nominal geocentric distance (LD) | Size (m) (approximate) | (H) (abs. mag.) | Closer approach to Moon | Refs |
| 2013-01-15 | 2013-01-20 | 2013 BR$_{27}$ | 0.00146 AU (218,000 km; 136,000 mi) | 0.57 | 7.3–16 | 27.8 | Yes | data · 2013 BR27 |
| 2013-01-28 | 2013-02-01 | 2013 CY | 0.00230 AU (344,000 km; 214,000 mi) | 0.9 | 6.1–14 | 28.2 | | data · 2013 CY |
| 2013-02-05 | 2013-02-06 | 2013 CY$_{32}$ | 0.000703 AU (105,200 km; 65,300 mi) | 0.27 | 6.4–14 | 28.1 | | data · 2013 CY32 |
| 2013-02-11 | 2013-02-14 | 2013 CL$_{129}$ | 0.00186 AU (278,000 km; 173,000 mi) | 0.72 | 5.6–12 | 28.4 | Yes | data · 2013 CL129 |
| 2013-02-15 | 2012-02-23 | 367943 Duende | 0.000228 AU (34,100 km; 21,200 mi) | 0.09 | 39–86 | 24.2 | | data · 2012 DA14 |
| 2013-03-04 | 2013-03-02 | 2013 EC | 0.00246 AU (368,000 km; 229,000 mi) | 0.96 | 7.3–16 | 27.8 | | data · 2013 EC |
| 2013-03-09 | 2013-03-07 | 2013 EC$_{20}$ | 0.00100 AU (150,000 km; 93,000 mi) | 0.39 | 4.2–9.4 | 29.0 | | data · 2013 EC20 |
| 2013-04-18 | 2013-04-19 | 2013 HT$_{25}$ | 0.000360 AU (53,900 km; 33,500 mi) | 0.14 | 4.5–10 | 28.9 | | data · 2013 HT25 |
| 2013-06-08 | 2013-06-06 | 2013 LR$_6$ | 0.000742 AU (111,000 km; 69,000 mi) | 0.29 | 7.3–16 | 27.8 | | data · 2013 LR6 |
| 2013-08-04 | 2013-08-04 | 2013 PJ10 | 0.00248 AU (371,000 km; 231,000 mi) | 0.97 | 32–71 | 24.6 | | data · 2013 PJ10 |
| 2013-08-09 | 2013-08-07 | 2013 PS$_{13}$ | 0.00137 AU (205,000 km; 127,000 mi) | 0.53 | 9.7–22 | 27.2 | | data · 2013 PS13 |
| 2013-09-03 | 2013-09-02 | 2013 RG | 0.00151 AU (226,000 km; 140,000 mi) | 0.59 | 3.5–7.8 | 29.4 | | data · 2013 RG |
| 2013-09-04 | 2013-09-05 | 2013 RO$_{30}$ | 0.00195 AU (292,000 km; 181,000 mi) | 0.76 | 5.6–12 | 28.4 | | data · 2013 RO30 |
| 2013-09-05 | 2013-09-03 | 2013 RF$_{32}$ | 0.00112 AU (168,000 km; 104,000 mi) | 0.44 | 4.8-11 | 28.7 | | data · 2013 RF32 |
| 2013-09-18 | 2013-09-13 | 2013 RZ$_{53}$ | 0.00163 AU (244,000 km; 152,000 mi) | 0.63 | 1.6–3.6 | 31.1 | | data · 2013 RZ53 |
| 2013-10-04 | 2013-10-05 | 2013 TR$_{12}$ | 0.00143 AU (214,000 km; 133,000 mi) | 0.56 | 5.1–11 | 28.6 | | data · 2013 TR12 |
| 2013-10-09 | 2013-10-10 | 2013 TL$_{127}$ | 0.00252 AU (377,000 km; 234,000 mi) | 0.98 | 12–27 | 26.7 | Yes | data · 2013 TL127 |
| 2013-10-21 | 2013-10-23 | 2013 UR$_1$ | 0.00168 AU (251,000 km; 156,000 mi) | 0.65 | 7–16 | 27.9 | Yes | data · 2013 UR1 |
| 2013-10-25 | 2013-10-24 | 2013 UX$_2$ | 0.00100 AU (150,000 km; 93,000 mi) | 0.39 | 3.8–8.6 | 29.2 | | data · 2013 UX2 |
| 2013-10-29 | 2013-10-25 | 2013 UV$_3$ | 0.00189 AU (283,000 km; 176,000 mi) | 0.74 | 12–26 | 26.8 | Yes | data · 2013 UV3 |
| 2013-11-08 | 2013-11-09 | 2013 VJ$_{11}$ | 0.00228 AU (341,000 km; 212,000 mi) | 0.89 | 7–16 | 27.9 | Yes | data · 2013 VJ11 |
| 2013-11-29 | 2013-11-28 | 2013 WH$_{25}$ | 0.000895 AU (133,900 km; 83,200 mi) | 0.35 | 3.2–7.1 | 29.6 | | data · 2013 WH25 |
| 2013-12-11 | 2013-12-12 | 2013 XS$_{21}$ | 0.000485 AU (72,600 km; 45,100 mi) | 0.19 | 3.5–7.8 | 29.4 | | data · 2013 XS21 |
| 2013-12-23 | 2013-12-23 | 2013 YB | 0.000181 AU (27,100 km; 16,800 mi) | 0.07 | 1.4–3.1 | 31.4 | | data · 2013 YB |

### 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 30 > H ≥ 29
Absolute magnitude 29 > H ≥ 28
Absolute magnitude 28 > H ≥ 27
Absolute magnitude 27 > H ≥ 26
(probable size of the Chelyabinsk meteor)
Absolute magnitude 26 > H ≥ 25
None
Absolute magnitude 25 > H (largest)
* After closest approach: 1 (50.0%)
* < 24 hours before: 0 (0.0%)
* up to 7 days before: 0 (0.0%)
* > one week before: 0 (0.0%)
* > 7 weeks before: 1 (50.0%)
* > one year before: 0 (0.0%)