List of asteroid close approaches to Earth in 2017

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

Asteroids which came closer to Earth than the Moon in 2017 by time of discovery

After closest approach: 23 (41.8%)   < 24 hours before: 6 (10.9%)   up to 7 days before: 24 (43.6%)   > one week before: 1 (1.8%)   > 7 weeks before: 0 (0.0%)   > one year before: 1 (1.8%) Other years 2015, 2016, 2017, 2018, 2019

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).^[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. 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.^[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)[a]	Nominal geocentric dist. (LD)	Size (m) (approx.)	(H) (abs. mag.)	Closer to Moon?
2017-01-09	2017-01-07[3]	2017 AG13	0.00139 AU (208,000 km; 129,000 mi)	0.543	16–36	26.1[4]
2017-01-25	2017-01-20[5]	2017 BX	0.00178 AU (266,000 km; 165,000 mi)	0.693	6.7–15	28.0[6]
2017-01-30	2017-01-29[7]	2017 BH30	0.000347 AU (51,900 km; 32,300 mi)	0.135[b]	4.6–10	28.8[8]
2017-02-02	2017-01-30[9]	2017 BS32	0.00109 AU (163,000 km; 101,000 mi)	0.423	8.1–18	27.6[10]
2017-02-23	2017-02-21[11]	2017 DG16	0.000920 AU (137,600 km; 85,500 mi)	0.358	3.7–8.2	29.3[12]	Yes
2017-02-25	2017-02-22[13]	2017 DR34	0.00149 AU (223,000 km; 139,000 mi)	0.581	3.8–8.6	29.2[14]
2017-03-02	2017-03-02[15]	2017 EA	0.000140 AU (20,900 km; 13,000 mi)	0.054	1.8–4.1	30.8[16]
2017-03-05	2017-02-27[17]	2017 DS109	0.00236 AU (353,000 km; 219,000 mi)	0.919	16–35	26.2[18]
2017-03-17	2017-03-16[19]	(573971) 2009 WW221 = 2017 FW158	0.000816 AU (122,100 km; 75,900 mi)	0.317	5.6–13	28.4[20]
2017-03-17	2017-03-19[21]	2017 FD3	0.00120 AU (180,000 km; 112,000 mi)	0.468	7.7–17	27.7[22]
2017-03-19	2017-03-17[23]	2017 FS	0.000730 AU (109,200 km; 67,900 mi)	0.284	4.4–9.9	28.9[24]
2017-03-20	2017-03-21[25]	2017 FX158	0.00182 AU (272,000 km; 169,000 mi)	0.707	4.3–9.5	29.0[26]
2017-03-20	2017-03-20[27]	2017 FN1	0.000423 AU (63,300 km; 39,300 mi)	0.165	2–4.5	30.6[28]
2017-03-20	2017-03-20[29]	2017 FM1	0.000856 AU (128,100 km; 79,600 mi)	0.333	3.3–7.5	29.5[30]
2017-03-30	2017-03-25[31]	2017 FJ101	0.00217 AU (325,000 km; 202,000 mi)	0.846	4.8–11	28.3[32]
2017-04-02	2017-03-29[33]	2017 FU102	0.00146 AU (218,000 km; 136,000 mi)	0.569	4.8–11	28.7[34]
2017-04-04	2017-04-03[35]	2017 GM	0.000109 AU (16,300 km; 10,100 mi)	0.042	2.8–6.2	29.9[36]
2017-04-16	2017-04-17[37]	2017 HJ	0.000908 AU (135,800 km; 84,400 mi)	0.353	8.3–19	27.5[38]
2017-04-21	2017-04-27[39]	2017 HG49	0.00238 AU (356,000 km; 221,000 mi)	0.927	8.4–19	27.5[40]
2017-04-22	2017-04-26[41]	2017 HG4	0.00156 AU (233,000 km; 145,000 mi)	0.607	7.7–17	27.7[42]
2017-04-23	2017-04-22[43]	2017 HV2	0.000838 AU (125,400 km; 77,900 mi)	0.326	4.4–9.9	28.9[44]
2017-05-02	2017-05-01[45]	2017 JA	0.000666 AU (99,600 km; 61,900 mi)	0.259	4–9	28.9[46]
2017-05-04	2017-05-02[47]	2017 JQ1	0.00114 AU (171,000 km; 106,000 mi)	0.442	3.7–8.2	29.4[48]
2017-05-04	2017-05-06[49]	2017 JB2	0.000372 AU (55,700 km; 34,600 mi)	0.145	3.8–8.6	29.0[50]
2017-07-21	2017-07-23[51]	2017 OO1	0.000852 AU (127,500 km; 79,200 mi)	0.332	33–75	24.4[52]
2017-08-14	2017-08-16[53]	2017 QP1	0.000419 AU (62,700 km; 38,900 mi)	0.163	37–83	24.3[54]
2017-08-20	2017-08-18[55]	2017 QN2	0.00145 AU (217,000 km; 135,000 mi)	0.563	5.8–13	27.9[56]
2017-08-29	2019-02-26[note 1][57]	2019 DP	0.000409 AU (61,200 km; 38,000 mi)	0.159	26–58	25.1
2017-09-03	2017-08-31[58]	2017 QB35	0.00238 AU (356,000 km; 221,000 mi)	0.928	3.7–8.2	29.3[59]
2017-09-14	2017-09-18[60]	2017 SQ2	0.00133 AU (199,000 km; 124,000 mi)	0.517	18–41	25.8[61]
2017-09-20	2017-09-17[62]	2017 SM2	0.00207 AU (310,000 km; 192,000 mi)	0.806	9.2–21	27.3[63]
2017-09-20	2017-09-21[64]	2017 SZ32	0.00138 AU (206,000 km; 128,000 mi)	0.535	3.8–8.4	29.3[65]	Yes
2017-09-20	2017-09-20[66]	2017 SR2	0.000623 AU (93,200 km; 57,900 mi)	0.243	5.1–11	28.6[67]
2017-09-24	2017-09-26[68]	2017 SU17	0.00185 AU (277,000 km; 172,000 mi)	0.720	6.7–15	28.0[69]
2017-09-24	2017-09-25[70]	2017 SS12	0.00172 AU (257,000 km; 160,000 mi)	0.670	10–23	27.0[71]	Yes
2017-09-30	2017-10-01[72]	2017 TQ2	0.000691 AU (103,400 km; 64,200 mi)	0.269	3.6–7.9	29.4[73]
2017-10-02	2017-09-29[74]	2017 SX17	0.000582 AU (87,100 km; 54,100 mi)	0.227	5.8–13	28.3[75]
2017-10-10	2017-10-14[76]	2017 TF5	0.00188 AU (281,000 km; 175,000 mi)	0.730	21–47	25.5[77]
2017-10-12	2012-10-04[78]	2012 TC4	0.000335 AU (50,100 km; 31,100 mi)	0.130[c]	12–27	26.7[79]
2017-10-15	2017-10-16[80]	2017 UF	0.00255 AU (381,000 km; 237,000 mi)	0.991	7–16	27.9[81]
2017-10-16	2017-10-15[82]	2017 TH5	0.000668 AU (99,900 km; 62,100 mi)	0.260	5.6–12	28.4[83]
2017-10-17	2017-10-19[84]	2017 UR2	0.00213 AU (319,000 km; 198,000 mi)	0.829	7.7–17	27.7[85]
2017-10-19	2017-10-11[86]	2017 TD6	0.00128 AU (191,000 km; 119,000 mi)	0.497	9.7–22	27.2[87]	Yes
2017-10-20	2017-10-21[88]	2017 UJ2	0.000120 AU (18,000 km; 11,200 mi)	0.047	1.8–3.9	30.9[89]
2017-10-21	2017-10-25[90]	2017 UA52	0.00131 AU (196,000 km; 122,000 mi)	0.511	5.3–12	28.5[91]	Yes
2017-10-28	2017-10-27[92]	2017 UL6	0.000398 AU (59,500 km; 37,000 mi)	0.155	1.1–2.4	32.0[93]
2017-10-30	2017-10-29[94]	2017 UK8	0.00151 AU (226,000 km; 140,000 mi)	0.588	6.1–14	28.2[95]
2017-11-04	2017-11-05[96]	2017 VE	0.00227 AU (340,000 km; 211,000 mi)	0.885	13–28	26.6[97]
2017-11-09	2017-11-10[98]	2017 VL2	0.000787 AU (117,700 km; 73,200 mi)	0.306	16–36	26.1[99]
2017-11-13	2017-11-15[100]	2017 VF14	0.00205 AU (307,000 km; 191,000 mi)	0.796	5.3–12	28.5[101]
2017-11-21	2017-11-20[102]	2017 WW1	0.000942 AU (140,900 km; 87,600 mi)	0.367	3.1–6.8	29.7[103]
2017-11-21	2017-11-22[104]	2017 WA14	0.000633 AU (94,700 km; 58,800 mi)	0.246	8.8–20	27.4[105]
2017-11-26	2017-11-26[106]	2017 WE30	0.000201 AU (30,100 km; 18,700 mi)	0.078	1.2–2.6	31.8[107]
2017-12-28	2017-12-25[108]	2017 YZ4	0.00149 AU (223,000 km; 139,000 mi)	0.582	6.4–14	28.1[109]
2017-12-30	2017-12-28[110]	2017 YE7	0.00206 AU (308,000 km; 191,000 mi)	0.801	5.3–12	28.5[111]

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.)	Closer to Moon?
2017-10-13	2017-10-21[112] (Unconfirmed)	YT80190	0.000537 AU (80,300 km; 49,900 mi)	0.21[d]	2–6	30.4
2017-10-22	2017-10-30[112] (Unconfirmed)	YU92F9B	0.00121 AU (181,000 km; 112,000 mi)	0.47[e]	3–10	29.2
2017-10-22	2017-10-30[112] (Unconfirmed)	YU95BEF	0.000130 AU (19,400 km; 12,100 mi)	0.051[f]	5–15	28.2
2017-11-14	2017-11-20[112] (Unconfirmed)	P10ELNY	0.000212 AU (31,700 km; 19,700 mi)	0.083[g]	4–12	28.8
2017-11-08	2017-11-16[112] (Unconfirmed)	A104Vqx	0.000222 AU (33,200 km; 20,600 mi)	0.086[h]	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)

Silhouette of man standing and facing forward

(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%)

Notes

1. 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.
2. Closest approach for 2017 BH₃₀ was over the Taymyr Peninsula.
3. This will mark the first time an asteroid was observed passing less than 1 LD to the Earth on two different occasions.
4. distance error: 0.0000894 AU, approach range: 0.17 to 0.24 LD. The asteroid is unconfirmed and will likely never receive a provisional designation.
5. distance error: 0.000283 AU, approach range: 0.36 to 0.58 LD. The asteroid is unconfirmed and will likely never receive a provisional designation.
6. distance error: 0.0000611 AU, approach range: 0.027 to 0.074 LD. The asteroid is unconfirmed and will likely never receive a provisional designation.
7. distance error: 0.000121 AU, approach range: 0.035 to 0.13 LD. The asteroid is unconfirmed and will likely never receive a provisional designation.
8. distance error: 0.000163 AU, approach range: 0.023 to 0.15 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 in 2017

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)[a]	Nominal lunocentric distance (LD)	Size (m) (approximate)	(H)	Approach distance to Earth (LD)
2017-01-25	2017 BA7	0.00187 AU (280,000 km; 174,000 mi)	0.73	5–16	28.1[113]	1.12
2017-01-25	2017 BX	0.00209 AU (313,000 km; 194,000 mi)	0.81	5–18	28.0[6]	0.69
2017-01-30	2017 BH30	0.00187 AU (280,000 km; 174,000 mi)	0.73	4–12	28.8[8]	0.13
2017-02-03	2017 BS32	0.00193 AU (289,000 km; 179,000 mi)	0.75	7–24	27.3[10]	0.42
2017-02-24	2017 DG16	0.000555 AU (83,000 km; 51,600 mi)	0.22[b]	3–9	29.3[12]	0.36
2017-02-25	2017 DR34	0.00179 AU (268,000 km; 166,000 mi)	0.70	3–11	29.1[12]	0.58
2017-03-02	2017 EA	0.00224 AU (335,000 km; 208,000 mi)	0.87	1–5	30.8[16]	0.054
2017-03-17	2017 FD3	0.00236 AU (353,000 km; 219,000 mi)	0.92	6–20	27.7[22]	0.47
2017-03-17	2017 FW158	0.00104 AU (156,000 km; 97,000 mi)	0.40	5–14	28.4[20]	0.32
2017-04-04	2017 GM	0.00227 AU (340,000 km; 211,000 mi)	0.88	2–7	29.9[36]	0.042
2017-04-21	2017 HG4	0.00177 AU (265,000 km; 165,000 mi)	0.69	6–21	27.6[42]	0.61
2017-04-24	2017 HV2	0.00230 AU (344,000 km; 214,000 mi)	0.90	3–12	28.9[44]	0.33
2017-05-02	2017 JA	0.00251 AU (375,000 km; 233,000 mi)	0.98	3–13	28.9[46]	0.26
2017-05-02	2017 JB2	0.00188 AU (281,000 km; 175,000 mi)	0.73	3–11	29.0[50]	0.14
2017-05-03	2017 JQ1	0.00247 AU (370,000 km; 230,000 mi)	0.96	3–9	29.4[48]	0.44
2017-05-31	2017 KW31	0.00114 AU (171,000 km; 106,000 mi)	0.45	10–36	26.5[114]	1.23
2017-07-21	2017 OO1	0.00236 AU (353,000 km; 219,000 mi)	0.92	25–90	24.5[52]	0.30
2017-08-14	2017 QP1	0.00230 AU (344,000 km; 214,000 mi)	0.90	31–91	24.3[54]	0.16
2017-08-21	2017 QN2	0.00176 AU (263,000 km; 164,000 mi)	0.69	5–22	27.9[56]	0.56
2017-08-26	2017 QQ17	0.00242 AU (362,000 km; 225,000 mi)	0.94	4–17	28.3[115]	1.02
2017-09-03	2017 QB35	0.00245 AU (367,000 km; 228,000 mi)	0.95	3–9	29.3[59]	0.93
2017-09-16	2017 RW17	0.00175 AU (262,000 km; 163,000 mi)	0.68	2–7	29.8[116]	1.08
2017-09-20	2017 SZ32	0.00129 AU (193,000 km; 120,000 mi)	0.50	3–9	29.2[65]	0.53
2017-09-20	2017 SM2	0.00213 AU (319,000 km; 198,000 mi)	0.83	6–26	27.3[63]	0.81
2017-09-24	2017 SS12	0.000320 AU (47,900 km; 29,700 mi)	0.12	8–27	27.0[71]	0.67
2017-09-30	2017 TQ2	0.00221 AU (331,000 km; 205,000 mi)	0.86	3–8	29.4[73]	0.27
2017-10-02	2017 SX17	0.00174 AU (260,000 km; 162,000 mi)	0.68	4–16	28.1[75]	0.22
2017-10-12	2012 TC4	0.00186 AU (278,000 km; 173,000 mi)	0.72	10–31	26.7[79]	0.23
2017-10-13	YT80190	0.00208 AU (311,000 km; 193,000 mi)	0.81[c]	2–6	30.4	0.21
2017-10-17	2017 TH5	0.00142 AU (212,000 km; 132,000 mi)	0.55	4–18	28.2[83]	0.26
2017-10-20	2017 UJ2	0.00166 AU (248,000 km; 154,000 mi)	0.65	1–5	30.8[89]	0.047
2017-10-20	2017 TD6	0.000756 AU (113,100 km; 70,300 mi)	0.29	7–28	27.2[87]	0.50
2017-10-20	2017 UA52	0.000288 AU (43,100 km; 26,800 mi)	0.11[d]	4–15	28.3[91]	0.51
2017-10-22	YU95BEF	0.000481 AU (72,000 km; 44,700 mi)	0.19[e]	5–15	28.2	0.051
2017-10-24	2017 UK3	0.00207 AU (310,000 km; 192,000 mi)	0.80	7–28	27.2[117]	1.38
2017-11-09	2017 VL2	0.00254 AU (380,000 km; 236,000 mi)	0.990	13–42	26.1[99]	0.31
2017-11-09	A104Vqx	0.00204 AU (305,000 km; 190,000 mi)	0.80[f]	4–14	28.4	0.086
2017-11-13	2017 VF14	0.00243 AU (364,000 km; 226,000 mi)	0.94	4–14	28.5[101]	0.80
2017-11-14	P10ELNY	0.00196 AU (293,000 km; 182,000 mi)	0.76[g]	4–12	28.8	0.083
2017-12-18	2017 YJ1	0.00142 AU (212,000 km; 132,000 mi)	0.55	6–26	27.5[118]	1.044
2017-12-28	2017 YZ4	0.00175 AU (262,000 km; 163,000 mi)	0.68	4–18	28.2[109]	0.58

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. This is the closest any known asteroid has passed to the Moon in nearly three years, after 2014 GY₄₄ passed 0.097 LD from the Moon in March 2014.
3. distance error: 0.00000802 AU, approach range: 0.807 to 0.814 LD. The asteroid is unconfirmed and will likely never receive a provisional designation.
4. This is the closest any known asteroid has passed to the Moon in nearly three years (even closer than 2017 DG₁₆) after 2014 GY₄₄ passed 0.097 LD from the Moon in March 2014.
5. distance error: 0.00000171 AU, approach range: 0.181 to 0.194 LD. The asteroid is unconfirmed and will likely never receive a provisional designation.
6. distance error: 0.0000188 AU, approach range: 0.788 to 0.803 LD. The asteroid is unconfirmed and will likely never receive a provisional designation.
7. distance error: 0.000177 AU, approach range: 0.69 to 0.83 LD. The asteroid is unconfirmed and will likely never receive a provisional designation.

Additional examples

Radar animation of 2017 BQ6 during closest approach on 7 February 2017

Radar animation of 2014 JO25 during closest approach on 19 April 2017

An example list of near-Earth asteroids that passed or will pass more than 1 lunar distance (384,400 km or 0.00256 AU) from Earth in 2017.

Object	Size (meters)	Lunar distances	Date
2017 AP19	65	3.34	6 January 2017
2017 BJ30[119]	16	1.03	31 January 2017
2017 BQ6	186	6.57	7 February 2017
2017 DZ37[120]	7	1.005	23 February 2017
2017 DV36[121]	9	1.02	27 February 2017
1998 SL36[122]	313	8.34	16 March 2017
2017 FT102[123]	4	1.05 1.04 moon	3 April 2017
2014 JO25[124]	823	4.57	19 April 2017
(418094) 2007 WV4[125]	890	7.96	1 June 2017
2017 KQ27[126]	30	1.02 1.34 moon	6 June 2017
2017 MF[127]	20	1.21 moon	19 June 2017
2017 NT5[128]	110	1.11 1.27 moon	14 July 2017
2006 SR131[129]	8	0.32 and 11 [clarification needed]	17–28 September 2017
(496817) 1989 VB[130]	394	7.88	29 September 2017
YT83F29 [citation needed]	4	2.6 0.73 moon	14 October 2017
(171576) 1999 VP11[131]	685	5.77	22 October 2017
(444584) 2006 UK[132]	313	8.66	17 November 2017

Statistics

Graph of near-Earth object sizes and close approaches in 2017. Shown here, asteroid 2014 JO25 was the largest asteroid that has approached within 5 LD from Earth in 2017.

Discoveries by month

month	<1 LD	<5 LD
January	3	17
February	3	27
March	9	34
April	5	28
May	3	14
June	0	10
July	1	11
August	2	17
September	5	32
October	14	52
November	8	29
December	2	28

Discoveries by size

Abs. mag	<1 LD	<5 LD
H <20	0	1
<21	0	0
<22	0	1
<23	0	3
<24	0	7
<25	3	19
<26	2	40
<27	4	74
<28	11	72
<29	18	57
<30	13	19
<31	4	5
<32	1	1
<33	1	1

Discoveries by survey

Survey	<1 LD	<5 LD
408 – Mount Nyukasa Station	0	1
703 – Catalina Sky Survey	12	52
704 – Lincoln Laboratory ETS	0	1
C51 – WISE	0	1
F51 – Pan-STARRS 1	10	56
G45 – Space Surveillance Telescope	0	3
G96 – Mt. Lemmon Survey	28	157
I52 – Steward Observatory, Mount Lemmon	0	1
J04 – ESA OGS	0	1
K88 – GINOP-KHK	0	1
T05 – ATLAS – Haleakala	2	11
T08 – ATLAS – Mauna Loa	5	15
Y00 – SONEAR	0	2

Virtual impactors

List of asteroids with a Palermo Technical Impact Hazard Scale greater than −6 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 2017. Given a short observation arc, many different orbits fit the observed data. 2010 XB₇₃ could have approached Earth around May 2017 or could have been 9 AU^[133] from Earth on the way to a close approach with Saturn in 2018. A Palermo rating of −4 indicates an event that is 10,000 times less likely than the background hazard level of Earth impacts, which is defined as the average risk posed by objects of the same size or larger over the years until the date of the potential impact.

Date	Object	Estimated diameter (meters)	Obs arc (days)	Impact probability (1 in)	Palermo scale	JPL Horizons nominal geocentric distance (AU)	NEODyS nominal geocentric distance (AU)
2017-05-22[134]	2010 GZ60	2,000[a]	1.3	830,000,000	-1.83	0.4 AU (60,000,000 km; 37,000,000 mi)	Not listed
2017-05-25[135]	2010 XB73	110	1.1	120,000,000	-4.47	1.6 AU (240,000,000 km; 150,000,000 mi)	9.0 AU (1.35×109 km; 840,000,000 mi)[133]
2017-08-19[136]	2015 ME131	500	1.8	420,000,000	-3.41	0.4 AU (60,000,000 km; 37,000,000 mi)	0.4 AU (60,000,000 km; 37,000,000 mi)
2017-09-18[137]	2015 HV182	157	0.9	7,700,000,000	-5.78	2.3 AU (340,000,000 km; 210,000,000 mi)	2.3 AU (340,000,000 km; 210,000,000 mi)
2017-11-18[138]	2008 VS4	45	0.083	100,000,000	-5.50	4.6 AU (690,000,000 km; 430,000,000 mi)	3.9 AU (580,000,000 km; 360,000,000 mi)
2017-11-29[139]	2007 YM	20	0.13	2,000,000	-5.21	5.1 AU (760,000,000 km; 470,000,000 mi)	5.1 AU (760,000,000 km; 470,000,000 mi)
2017-12-01[134]	2010 GZ60	2,000[a]	1.3	10,000,000,000	-3.62	1.0 AU (150,000,000 km; 93,000,000 mi)	Not listed
2017-12-13[140]	2005 TM173	53	1.9	230,000,000	-5.98	5.7 AU (850,000,000 km; 530,000,000 mi)	5.7 AU (850,000,000 km; 530,000,000 mi)
2017-12-20[134]	2010 GZ60	2,000[a]	1.3	83,000,000	-1.97	1.2 AU (180,000,000 km; 110,000,000 mi)	Not listed

Notes

1. Discovered and only observed by WISE, an infrared telescope, so no apparent magnitude, and therefore estimated size was provided. As such, the size is only a rough estimate. Observation arc is only 1.3 days. Eccentricity is assumed and the object is lost.

See also

• List of asteroid close approaches to Earth
• List of asteroid close approaches to Earth in 2016
• List of asteroid close approaches to Earth in 2018
• List of bolides (asteroids and meteoroids that impacted Earth)

Notes

1. Precovery around this close approach: 2017-08-16 to 2017-08-28