# List of asteroid close approaches to Earth in 2017

Below is the list of asteroid close approaches to Earth in 2017.

## Timeline of known close approaches less than one lunar distance from Earth in 2017

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 2017, based on the close approach database of the Center for Near-Earth Object Studies (CNEOS).
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. In 2017, four known asteroids have traveled nearer than this: 2017 GM, 2017 UJ2, 2017 EA, and 2017 WE30. Unconfirmed asteroids YU95BEF, P10ELNY and A104Vqx probably have traveled nearer, but knowledge of their orbits is too poor to be sure.
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 are only included if the object was found by precovery.
This list and relevant databases do not consider impacts as close approaches, thus this list does not include any of the 29 objects that collided with Earth's atmosphere in 2017, none of which were discovered in advance, but were observed visually or recorded by sensors designed to detect detonation of nuclear devices.
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 dist. (LD) | Size (m) (approx.) | (H) (abs. mag.) | Closer to Moon? |
| 2017-01-09 | 2017-01-07 | 2017 AG13 | 0.00139 AU (208,000 km; 129,000 mi) | 0.543 | 16–36 | 26.1 | |
| 2017-01-25 | 2017-01-20 | 2017 BX | 0.00178 AU (266,000 km; 165,000 mi) | 0.693 | 6.7–15 | 28.0 | |
| 2017-01-30 | 2017-01-29 | 2017 BH$_{30}$ | 0.000347 AU (51,900 km; 32,300 mi) | 0.135 | 4.6–10 | 28.8 | |
| 2017-02-02 | 2017-01-30 | 2017 BS$_{32}$ | 0.00109 AU (163,000 km; 101,000 mi) | 0.423 | 8.1–18 | 27.6 | |
| 2017-02-23 | 2017-02-21 | 2017 DG$_{16}$ | 0.000920 AU (137,600 km; 85,500 mi) | 0.358 | 3.7–8.2 | 29.3 | Yes |
| 2017-02-25 | 2017-02-22 | 2017 DR$_{34}$ | 0.00149 AU (223,000 km; 139,000 mi) | 0.581 | 3.8–8.6 | 29.2 | |
| 2017-03-02 | 2017-03-02 | 2017 EA | 0.000140 AU (20,900 km; 13,000 mi) | 0.054 | 1.8–4.1 | 30.8 | |
| 2017-03-05 | 2017-02-27 | 2017 DS$_{109}$ | 0.00236 AU (353,000 km; 219,000 mi) | 0.919 | 16–35 | 26.2 | |
| 2017-03-17 | 2017-03-16 | (573971) 2009 WW$_{221}$ = 2017 FW$_{158}$ | 0.000816 AU (122,100 km; 75,900 mi) | 0.317 | 5.6–13 | 28.4 | |
| 2017-03-17 | 2017-03-19 | 2017 FD$_3$ | 0.00120 AU (180,000 km; 112,000 mi) | 0.468 | 7.7–17 | 27.7 | |
| 2017-03-19 | 2017-03-17 | 2017 FS | 0.000730 AU (109,200 km; 67,900 mi) | 0.284 | 4.4–9.9 | 28.9 | |
| 2017-03-20 | 2017-03-21 | 2017 FX$_{158}$ | 0.00182 AU (272,000 km; 169,000 mi) | 0.707 | 4.3–9.5 | 29.0 | |
| 2017-03-20 | 2017-03-20 | 2017 FN$_1$ | 0.000423 AU (63,300 km; 39,300 mi) | 0.165 | 2–4.5 | 30.6 | |
| 2017-03-20 | 2017-03-20 | 2017 FM$_1$ | 0.000856 AU (128,100 km; 79,600 mi) | 0.333 | 3.3–7.5 | 29.5 | |
| 2017-03-30 | 2017-03-25 | 2017 FJ$_{101}$ | 0.00217 AU (325,000 km; 202,000 mi) | 0.846 | 4.8–11 | 28.3 | |
| 2017-04-02 | 2017-03-29 | 2017 FU$_{102}$ | 0.00146 AU (218,000 km; 136,000 mi) | 0.569 | 4.8–11 | 28.7 | |
| 2017-04-04 | 2017-04-03 | 2017 GM | 0.000109 AU (16,300 km; 10,100 mi) | 0.042 | 2.8–6.2 | 29.9 | |
| 2017-04-16 | 2017-04-17 | 2017 HJ | 0.000908 AU (135,800 km; 84,400 mi) | 0.353 | 8.3–19 | 27.5 | |
| 2017-04-21 | 2017-04-27 | 2017 HG$_{49}$ | 0.00238 AU (356,000 km; 221,000 mi) | 0.927 | 8.4–19 | 27.5 | |
| 2017-04-22 | 2017-04-26 | 2017 HG$_4$ | 0.00156 AU (233,000 km; 145,000 mi) | 0.607 | 7.7–17 | 27.7 | |
| 2017-04-23 | 2017-04-22 | 2017 HV$_2$ | 0.000838 AU (125,400 km; 77,900 mi) | 0.326 | 4.4–9.9 | 28.9 | |
| 2017-05-02 | 2017-05-01 | 2017 JA | 0.000666 AU (99,600 km; 61,900 mi) | 0.259 | 4–9 | 28.9 | |
| 2017-05-04 | 2017-05-02 | 2017 JQ$_1$ | 0.00114 AU (171,000 km; 106,000 mi) | 0.442 | 3.7–8.2 | 29.4 | |
| 2017-05-04 | 2017-05-06 | 2017 JB$_2$ | 0.000372 AU (55,700 km; 34,600 mi) | 0.145 | 3.8–8.6 | 29.0 | |
| 2017-07-21 | 2017-07-23 | 2017 OO1 | 0.000852 AU (127,500 km; 79,200 mi) | 0.332 | 33–75 | 24.4 | |
| 2017-08-14 | 2017-08-16 | 2017 QP1 | 0.000419 AU (62,700 km; 38,900 mi) | 0.163 | 37–83 | 24.3 | |
| 2017-08-20 | 2017-08-18 | 2017 QN$_2$ | 0.00145 AU (217,000 km; 135,000 mi) | 0.563 | 5.8–13 | 27.9 | |
| 2017-08-29 | 2019-02-26 | 2019 DP | 0.000409 AU (61,200 km; 38,000 mi) | 0.159 | 26–58 | 25.1 | |
| 2017-09-03 | 2017-08-31 | 2017 QB$_{35}$ | 0.00238 AU (356,000 km; 221,000 mi) | 0.928 | 3.7–8.2 | 29.3 | |
| 2017-09-14 | 2017-09-18 | 2017 SQ$_2$ | 0.00133 AU (199,000 km; 124,000 mi) | 0.517 | 18–41 | 25.8 | |
| 2017-09-20 | 2017-09-17 | 2017 SM$_2$ | 0.00207 AU (310,000 km; 192,000 mi) | 0.806 | 9.2–21 | 27.3 | |
| 2017-09-20 | 2017-09-21 | 2017 SZ$_{32}$ | 0.00138 AU (206,000 km; 128,000 mi) | 0.535 | 3.8–8.4 | 29.3 | Yes |
| 2017-09-20 | 2017-09-20 | 2017 SR$_2$ | 0.000623 AU (93,200 km; 57,900 mi) | 0.243 | 5.1–11 | 28.6 | |
| 2017-09-24 | 2017-09-26 | 2017 SU$_{17}$ | 0.00185 AU (277,000 km; 172,000 mi) | 0.720 | 6.7–15 | 28.0 | |
| 2017-09-24 | 2017-09-25 | 2017 SS$_{12}$ | 0.00172 AU (257,000 km; 160,000 mi) | 0.670 | 10–23 | 27.0 | Yes |
| 2017-09-30 | 2017-10-01 | 2017 TQ$_2$ | 0.000691 AU (103,400 km; 64,200 mi) | 0.269 | 3.6–7.9 | 29.4 | |
| 2017-10-02 | 2017-09-29 | 2017 SX$_{17}$ | 0.000582 AU (87,100 km; 54,100 mi) | 0.227 | 5.8–13 | 28.3 | |
| 2017-10-10 | 2017-10-14 | 2017 TF$_5$ | 0.00188 AU (281,000 km; 175,000 mi) | 0.730 | 21–47 | 25.5 | |
| 2017-10-12 | 2012-10-04 | 2012 TC4 | 0.000335 AU (50,100 km; 31,100 mi) | 0.130 | 12–27 | 26.7 | |
| 2017-10-15 | 2017-10-16 | 2017 UF | 0.00255 AU (381,000 km; 237,000 mi) | 0.991 | 7–16 | 27.9 | |
| 2017-10-16 | 2017-10-15 | 2017 TH$_5$ | 0.000668 AU (99,900 km; 62,100 mi) | 0.260 | 5.6–12 | 28.4 | |
| 2017-10-17 | 2017-10-19 | 2017 UR$_2$ | 0.00213 AU (319,000 km; 198,000 mi) | 0.829 | 7.7–17 | 27.7 | |
| 2017-10-19 | 2017-10-11 | 2017 TD6 | 0.00128 AU (191,000 km; 119,000 mi) | 0.497 | 9.7–22 | 27.2 | Yes |
| 2017-10-20 | 2017-10-21 | 2017 UJ$_2$ | 0.000120 AU (18,000 km; 11,200 mi) | 0.047 | 1.8–3.9 | 30.9 | |
| 2017-10-21 | 2017-10-25 | 2017 UA$_{52}$ | 0.00131 AU (196,000 km; 122,000 mi) | 0.511 | 5.3–12 | 28.5 | Yes |
| 2017-10-28 | 2017-10-27 | 2017 UL$_6$ | 0.000398 AU (59,500 km; 37,000 mi) | 0.155 | 1.1–2.4 | 32.0 | |
| 2017-10-30 | 2017-10-29 | 2017 UK$_8$ | 0.00151 AU (226,000 km; 140,000 mi) | 0.588 | 6.1–14 | 28.2 | |
| 2017-11-04 | 2017-11-05 | 2017 VE | 0.00227 AU (340,000 km; 211,000 mi) | 0.885 | 13–28 | 26.6 | |
| 2017-11-09 | 2017-11-10 | 2017 VL2 | 0.000787 AU (117,700 km; 73,200 mi) | 0.306 | 16–36 | 26.1 | |
| 2017-11-13 | 2017-11-15 | 2017 VF$_{14}$ | 0.00205 AU (307,000 km; 191,000 mi) | 0.796 | 5.3–12 | 28.5 | |
| 2017-11-21 | 2017-11-20 | 2017 WW$_1$ | 0.000942 AU (140,900 km; 87,600 mi) | 0.367 | 3.1–6.8 | 29.7 | |
| 2017-11-21 | 2017-11-22 | 2017 WA$_{14}$ | 0.000633 AU (94,700 km; 58,800 mi) | 0.246 | 8.8–20 | 27.4 | |
| 2017-11-26 | 2017-11-26 | 2017 WE$_{30}$ | 0.000201 AU (30,100 km; 18,700 mi) | 0.078 | 1.2–2.6 | 31.8 | |
| 2017-12-28 | 2017-12-25 | 2017 YZ$_4$ | 0.00149 AU (223,000 km; 139,000 mi) | 0.582 | 6.4–14 | 28.1 | |
| 2017-12-30 | 2017-12-28 | 2017 YE$_7$ | 0.00206 AU (308,000 km; 191,000 mi) | 0.801 | 5.3–12 | 28.5 | |
In addition to the confirmed asteroids on the above list, which feature in the CNEOS close approach database, there have been well-observed unconfirmed or confirmed but poorly observed objects with a 50% or greater chance of passing within 1 LD of the Earth, which are listed separately below.
| Date of closest approach | Date discovered | Object | Nominal geocentric distance (AU) | Nominal geocentric dist. (LD) | Size (m) (approx.) | (H) (abs. mag.) |
| 2017-10-13 | 2017-10-21 (Unconfirmed) | YT80190 | 0.000537 AU (80,300 km; 49,900 mi) | 0.21 | 2–6 | 30.4 |
| 2017-10-22 | 2017-10-30 (Unconfirmed) | YU92F9B | 0.00121 AU (181,000 km; 112,000 mi) | 0.47 | 3–10 | 29.2 |
| 2017-10-22 | 2017-10-30 (Unconfirmed) | YU95BEF | 0.000130 AU (19,400 km; 12,100 mi) | 0.051 | 5–15 | 28.2 |
| 2017-11-14 | 2017-11-20 (Unconfirmed) | P10ELNY | 0.000212 AU (31,700 km; 19,700 mi) | 0.083 | 4–12 | 28.8 |
| 2017-11-08 | 2017-11-16 (Unconfirmed) | A104Vqx | 0.000222 AU (33,200 km; 20,600 mi) | 0.086 | 4–14 | 28.4 |

### Warning times by size

This sub-section visualises the warning times of the close approaches listed in the table of confirmed close approaches, 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 H ≥ 30 (smallest)
(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
Absolute magnitude 26 > H ≥ 25
Absolute magnitude 25 > H (largest)
* After closest approach: 2 (100.0%)
* < 24 hours before: 0 (0.0%)
* up to 7 days before: 0 (0.0%)
* > one week before: 0 (0.0%)
* > 7 weeks before: 0 (0.0%)
* > one year before: 0 (0.0%)