List of asteroid close approaches to Earth in 2017

Last updated

Time of discovery of asteroids which came closer to Earth than the Moon in 2017
Circle frame.svgAfter closest approach: 26 (45.6%)< 24 hours before: 6 (10.5%)up to 7 days before: 23 (40.4%)> one week before: 1 (1.8%)> 7 weeks before: 0 (0.0%)> one year before: 1 (1.8%)
  •   After closest approach: 26 (45.6%)
  •   < 24 hours before: 6 (10.5%)
  •   up to 7 days before: 23 (40.4%)
  •   > one week before: 1 (1.8%)
  •   > 7 weeks before: 0 (0.0%)
  •   > one year before: 1 (1.8%)

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

Contents

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. [lower-alpha 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, five known asteroids have traveled nearer than this, 2017 GM, 2017 UJ2, YU95BEF, 2017 EA, and 2017 WE30. P10ELNY and A104Vqx probably have traveled nearer, but knowledge of their orbits is too poor to be sure.

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.

This list does not include any of the 29 objects that collided with earth in 2017, none of which were discovered in advance, but were recorded by sensors designed to detect detonation of nuclear devices (of the 29 objects detected, 6 had an impact energy greater than that of a 1 kiloton device). [1]

  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) [lower-alpha 2] 		Nominal
geocentric
dist. (LD)		Size (m)
(approx.)		(H)
(mag)		Closer
to
Moon?
2017-01-092017-01-07 [2] 2017 AG13 0.00139  AU (208,000  km ; 129,000  mi )0.5413–4126.1 [3]
2017-01-252017-01-20 [4] 2017 BX0.00178 AU (266,000 km; 165,000 mi)0.695–1828.0 [5]
2017-01-302017-01-29 [6] 2017 BH300.000347 AU (51,900 km; 32,300 mi)0.13 [lower-alpha 3] 4–1228.8 [7]
2017-02-022017-01-30 [8] 2017 BS320.00109 AU (163,000 km; 101,000 mi)0.427–2427.3 [9]
2017-02-232017-02-21 [10] 2017 DG160.000920 AU (137,600 km; 85,500 mi)0.363–929.3 [11] Yes
2017-02-252017-02-22 [12] 2017 DR340.00149 AU (223,000 km; 139,000 mi)0.583–1129.1 [13]
2017-03-022017-03-02 [14] 2017 EA0.000140 AU (20,900 km; 13,000 mi)0.0541–530.8 [15]
2017-03-052017-02-27 [16] 2017 DS1090.00236 AU (353,000 km; 219,000 mi)0.9213–4325.9 [17]
2017-03-172017-03-19 [18] 2017 FD30.00120 AU (180,000 km; 112,000 mi)0.476–2027.7 [19]
2017-03-172017-03-19 [20] 2017 FW1580.000815 AU (121,900 km; 75,800 mi)0.325–1428.4 [21]
2017-03-192017-03-17 [22] 2017 FS0.000730 AU (109,200 km; 67,900 mi)0.283–1129.0 [23]
2017-03-202017-03-21 [24] 2017 FX1580.00182 AU (272,000 km; 169,000 mi)0.713–1129.0 [25]
2017-03-202017-03-20 [26] 2017 FN10.000423 AU (63,300 km; 39,300 mi)0.162–530.6 [27]
2017-03-202017-03-20 [28] 2017 FM10.000856 AU (128,100 km; 79,600 mi)0.333–929.5 [29]
2017-03-302017-03-25 [30] 2017 FJ1010.00217 AU (325,000 km; 202,000 mi)0.854–1528.5 [31]
2017-04-022017-03-29 [32] 2017 FU1020.00146 AU (218,000 km; 136,000 mi)0.574–1328.7 [33]
2017-04-042017-04-03 [34] 2017 GM0.000109 AU (16,300 km; 10,100 mi)0.0422–729.9 [35]
2017-04-162017-04-17 [36] 2017 HJ0.000908 AU (135,800 km; 84,400 mi)0.357–2227.5 [37]
2017-04-222017-04-26 [38] 2017 HG40.00156 AU (233,000 km; 145,000 mi)0.616–2127.6 [39]
2017-04-232017-04-22 [40] 2017 HV20.000838 AU (125,400 km; 77,900 mi)0.333–1228.9 [41]
2017-05-022017-05-01 [42] 2017 JA0.000666 AU (99,600 km; 61,900 mi)0.263–1328.9 [43]
2017-05-042017-05-02 [44] 2017 JQ10.00114 AU (171,000 km; 106,000 mi)0.443–929.4 [45]
2017-05-042017-05-06 [46] 2017 JB20.000372 AU (55,700 km; 34,600 mi)0.143–1129.0 [47]
2017-07-212017-07-23 [48] 2017 OO1 0.000852 AU (127,500 km; 79,200 mi)0.3326–9324.4 [49]
2017-08-142017-08-16 [50] 2017 QP1 0.000419 AU (62,700 km; 38,900 mi)0.1631–9124.3 [51]
2017-08-202017-08-18 [52] 2017 QN20.00145 AU (217,000 km; 135,000 mi)0.565–2227.9 [53]
2017-09-032017-08-31 [54] 2017 QB350.00238 AU (356,000 km; 221,000 mi)0.933–929.3 [55]
2017-09-142017-09-18 [56] 2017 SQ20.00133 AU (199,000 km; 124,000 mi)0.5214–4925.8 [57]
2017-09-202017-09-17 [58] 2017 SM20.00207 AU (310,000 km; 192,000 mi)0.816–2627.3 [59]
2017-09-202017-09-21 [60] 2017 SZ320.00137 AU (205,000 km; 127,000 mi)0.533–929.2 [61] Yes
2017-09-202017-09-20 [62] 2017 SR20.000623 AU (93,200 km; 57,900 mi)0.244–1228.5 [63]
2017-09-242017-09-25 [64] 2017 SS120.00172 AU (257,000 km; 160,000 mi)0.678–2727.0 [65] Yes
2017-09-302017-10-01 [66] 2017 TQ20.000691 AU (103,400 km; 64,200 mi)0.273–829.4 [67]
2017-10-022017-09-29 [68] 2017 SX170.00058 AU (87,000 km; 54,000 mi)0.234–1628.1 [69]
2017-10-102017-10-14 [70] 2017 TF50.00187 AU (280,000 km; 174,000 mi)0.7320–9524.7 [71]
2017-10-122012-10-04 [72] 2012 TC4 0.000335 AU (50,100 km; 31,100 mi)0.13 [lower-alpha 4] 10–3126.7 [73]
2017-10-132017-10-21 [74]
(Unconfirmed)		YT801900.000537 AU (80,300 km; 49,900 mi)0.21 [lower-alpha 5] 2–630.4
2017-10-152017-10-16 [75] 2017 UF0.00255 AU (381,000 km; 237,000 mi)0.9925–2027.9 [76]
2017-10-162017-10-15 [77] 2017 TH50.000668 AU (99,900 km; 62,100 mi)0.264–1828.2 [78]
2017-10-172017-10-19 [79] 2017 UR20.00213 AU (319,000 km; 198,000 mi)0.836–1927.8 [80]
2017-10-192017-10-11 [81] 2017 TD6 0.00128 AU (191,000 km; 119,000 mi)0.507–2827.2 [82] Yes
2017-10-202017-10-21 [83] 2017 UJ20.000120 AU (18,000 km; 11,200 mi)0.0471–530.8 [84]
2017-10-212017-10-25 [85] 2017 UA520.00132 AU (197,000 km; 123,000 mi)0.514–1528.5 [86] Yes
2017-10-222017-10-30 [74]
(Unconfirmed)		YU92F9B0.00121 AU (181,000 km; 112,000 mi)0.47 [lower-alpha 6] 3–1029.2
2017-10-222017-10-30 [74]
(Unconfirmed)		YU95BEF0.000130 AU (19,400 km; 12,100 mi)0.051 [lower-alpha 7] 5–1528.2
2017-10-282017-10-27 [87] 2017 UL60.000398 AU (59,500 km; 37,000 mi)0.161–332.0 [88]
2017-10-302017-10-29 [89] 2017 UK80.00151 AU (226,000 km; 140,000 mi)0.594–1728.3 [90]
2017-11-042017-11-05 [91] 2017 VE0.00227 AU (340,000 km; 211,000 mi)0.8810–3126.6 [92]
2017-11-082017-11-16 [74]
(Unconfirmed)		A104Vqx0.000222 AU (33,200 km; 20,600 mi)0.086 [lower-alpha 8] 4–1428.4
2017-11-092017-11-10 [93] 2017 VL2 0.000787 AU (117,700 km; 73,200 mi)0.3113–4226.1 [94]
2017-11-132017-11-15 [95] 2017 VF140.00205 AU (307,000 km; 191,000 mi)0.804–1428.5 [96]
2017-11-142017-11-20 [74]
(Unconfirmed)		P10ELNY0.000212 AU (31,700 km; 19,700 mi)0.083 [lower-alpha 9] 4–1228.8
2017-11-212017-11-20 [97] 2017 WW10.000942 AU (140,900 km; 87,600 mi)0.373–729.7 [98]
2017-11-212017-11-22 [99] 2017 WA140.000633 AU (94,700 km; 58,800 mi)0.256–2627.5 [100]
2017-11-262017-11-26 [101] 2017 WE300.000201 AU (30,100 km; 18,700 mi)0.0781–331.9 [102]
2017-12-282017-12-25 [103] 2017 YZ40.00149 AU (223,000 km; 139,000 mi)0.584–1828.2 [104]
2017-12-302017-12-28 [105] 2017 YE70.00206 AU (308,000 km; 191,000 mi)0.804–1328.5 [106]

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.

Abs Magnitude 30 and greater

Silhouette of man standing and facing forward Silhouette of man standing and facing forward.svg
Silhouette of man standing and facing forward

(size of a person for comparison)

Circle frame.svgAfter closest approach: 2 (33.3%)< 24 hours before: 3 (50.0%)up to 7 days before: 1 (16.7%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Abs Magnitude 29-30

Circle frame.svgAfter closest approach: 5 (38.5%)< 24 hours before: 1 (7.7%)up to 7 days before: 7 (53.8%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Absolute Magnitude 28-29

Circle frame.svgAfter closest approach: 6 (33.3%)< 24 hours before: 2 (11.1%)up to 7 days before: 10 (55.6%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Absolute Magnitude 27-28

Circle frame.svgAfter closest approach: 7 (63.6%)< 24 hours before: 0 (0.0%)up to 7 days before: 3 (27.3%)> one week before: 1 (9.1%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Absolute Magnitude 26-27

Circle frame.svgAfter closest approach: 2 (50.0%)< 24 hours before: 0 (0.0%)up to 7 days before: 1 (25.0%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 1 (25.0%)

Absolute Magnitude 25-26

Circle frame.svgAfter closest approach: 1 (50.0%)< 24 hours before: 0 (0.0%)up to 7 days before: 1 (50.0%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Absolute Magnitude less than 25 (largest)

Circle frame.svgAfter closest approach: 3 (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%)
  •   After closest approach: 3 (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. ↑ For a list of current Earth close approaches see NEO Earth Close Approaches
  2. ↑ 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.
  3. ↑ Closest approach for 2017 BH30 was over the Taymyr Peninsula.
  4. ↑ This will mark the first time an asteroid was observed passing less than 1 LD to the Earth on two different occasions.
  5. ↑ 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.
  6. ↑ 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.
  7. ↑ 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.
  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.
  9. ↑ 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.

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:

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) [lower-alpha 1] 		Nominal lunocentric
distance (LD)		Size (m)
(approximate)		(H)Approach
distance
to Earth
(LD)
2017-01-252017 BA70.00187 AU (280,000 km; 174,000 mi)0.735–1628.1 [107] 1.12
2017-01-252017 BX0.00209 AU (313,000 km; 194,000 mi)0.815–1828.0 [5] 0.69
2017-01-302017 BH300.00187 AU (280,000 km; 174,000 mi)0.734–1228.8 [7] 0.13
2017-02-032017 BS320.00193 AU (289,000 km; 179,000 mi)0.757–2427.3 [9] 0.42
2017-02-242017 DG160.000555 AU (83,000 km; 51,600 mi)0.22 [lower-alpha 2] 3–929.3 [11] 0.36
2017-02-252017 DR340.00179 AU (268,000 km; 166,000 mi)0.703–1129.1 [11] 0.58
2017-03-022017 EA0.00224 AU (335,000 km; 208,000 mi)0.871–530.8 [15] 0.054
2017-03-172017 FD30.00236 AU (353,000 km; 219,000 mi)0.926–2027.7 [19] 0.47
2017-03-172017 FW1580.00104 AU (156,000 km; 97,000 mi)0.405–1428.4 [21] 0.32
2017-04-042017 GM0.00227 AU (340,000 km; 211,000 mi)0.882–729.9 [35] 0.042
2017-04-212017 HG40.00177 AU (265,000 km; 165,000 mi)0.696–2127.6 [39] 0.61
2017-04-242017 HV20.00230 AU (344,000 km; 214,000 mi)0.903–1228.9 [41] 0.33
2017-05-022017 JA0.00251 AU (375,000 km; 233,000 mi)0.983–1328.9 [43] 0.26
2017-05-022017 JB20.00188 AU (281,000 km; 175,000 mi)0.733–1129.0 [47] 0.14
2017-05-032017 JQ10.00247 AU (370,000 km; 230,000 mi)0.963–929.4 [45] 0.44
2017-05-312017 KW310.00114 AU (171,000 km; 106,000 mi)0.4510–3626.5 [108] 1.23
2017-07-21 2017 OO1 0.00236 AU (353,000 km; 219,000 mi)0.9225–9024.5 [49] 0.30
2017-08-14 2017 QP1 0.00230 AU (344,000 km; 214,000 mi)0.9031–9124.3 [51] 0.16
2017-08-212017 QN20.00176 AU (263,000 km; 164,000 mi)0.695–2227.9 [53] 0.56
2017-08-262017 QQ170.00242 AU (362,000 km; 225,000 mi)0.944–1728.3 [109] 1.02
2017-09-032017 QB350.00245 AU (367,000 km; 228,000 mi)0.953–929.3 [55] 0.93
2017-09-162017 RW170.00175 AU (262,000 km; 163,000 mi)0.682–729.8 [110] 1.08
2017-09-202017 SZ320.00129 AU (193,000 km; 120,000 mi)0.503–929.2 [61] 0.53
2017-09-202017 SM20.00213 AU (319,000 km; 198,000 mi)0.836–2627.3 [59] 0.81
2017-09-242017 SS120.000320 AU (47,900 km; 29,700 mi)0.128–2727.0 [65] 0.67
2017-09-302017 TQ20.00221 AU (331,000 km; 205,000 mi)0.863–829.4 [67] 0.27
2017-10-022017 SX170.00174 AU (260,000 km; 162,000 mi)0.684–1628.1 [69] 0.22
2017-10-12 2012 TC4 0.00186 AU (278,000 km; 173,000 mi)0.7210–3126.7 [73] 0.23
2017-10-13YT801900.00208 AU (311,000 km; 193,000 mi)0.81 [lower-alpha 3] 2–630.40.21
2017-10-172017 TH50.00142 AU (212,000 km; 132,000 mi)0.554–1828.2 [78] 0.26
2017-10-202017 UJ20.00166 AU (248,000 km; 154,000 mi)0.651–530.8 [84] 0.047
2017-10-202017 TD60.000756 AU (113,100 km; 70,300 mi)0.297–2827.2 [82] 0.50
2017-10-202017 UA520.000288 AU (43,100 km; 26,800 mi)0.11 [lower-alpha 4] 4–1528.3 [86] 0.51
2017-10-22YU95BEF0.000481 AU (72,000 km; 44,700 mi)0.19 [lower-alpha 5] 5–1528.20.051
2017-10-242017 UK30.00207 AU (310,000 km; 192,000 mi)0.807–2827.2 [111] 1.38
2017-11-092017 VL20.00254 AU (380,000 km; 236,000 mi)0.99013–4226.1 [94] 0.31
2017-11-09A104Vqx0.00204 AU (305,000 km; 190,000 mi)0.80 [lower-alpha 6] 4–1428.40.086
2017-11-132017 VF140.00243 AU (364,000 km; 226,000 mi)0.944–1428.5 [96] 0.80
2017-11-14P10ELNY0.00196 AU (293,000 km; 182,000 mi)0.76 [lower-alpha 7] 4–1228.80.083
2017-12-182017 YJ10.00142 AU (212,000 km; 132,000 mi)0.556–2627.5 [112] 1.044
2017-12-282017 YZ40.00175 AU (262,000 km; 163,000 mi)0.684–1828.2 [104] 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 2017 BQ6 radar rotation.gif
Radar animation of 2017 BQ6 during closest approach on 7 February 2017
Radar animation of 2014 JO25 during closest approach on 19 April 2017 PIA21597 - New Radar Images of Asteroid 2014 JO25 (cropped).gif
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.

ObjectSize
(meters)		 Lunar
distances 		Date
2017 AP19653.346 January 2017
2017 BJ30 [113] 161.0331 January 2017
2017 BQ6 1866.577 February 2017
2017 DZ37 [114] 71.00523 February 2017
2017 DV36 [115] 91.0227 February 2017
1998 SL36 [116] 3138.3416 March 2017
2017 FT102 [117] 41.05
1.04 moon		3 April 2017
2014 JO25 [118] 8234.5719 April 2017
(418094) 2007 WV4 [119] 8907.961 June 2017
2017 KQ27 [120] 301.02
1.34 moon		6 June 2017
2017 MF [121] 201.21 moon19 June 2017
2017 NT5 [122] 1101.11
1.27 moon		14 July 2017
2006 SR131 [123] 80.32 and 11
[ clarification needed ]		17–28 September 2017
(496817) 1989 VB [124] 3947.8829 September 2017
YT83F29
[ citation needed ]		42.6
0.73 moon		14 October 2017
(171576) 1999 VP11 [125] 6855.7722 October 2017
(444584) 2006 UK [126] 3138.6617 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. 2017NEAs.png
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 [127] 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.

DateObjectEstimated
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 [128] 2010 GZ60 2,000 [lower-alpha 1] 1.3830,000,000-1.830.4 AU (60,000,000 km; 37,000,000 mi)Not listed
2017-05-25 [129] 2010 XB731101.1120,000,000-4.471.6 AU (240,000,000 km; 150,000,000 mi)9.0 AU (1.35×109 km; 840,000,000 mi) [127]
2017-08-19 [130] 2015 ME131 5001.8420,000,000-3.410.4 AU (60,000,000 km; 37,000,000 mi)0.4 AU (60,000,000 km; 37,000,000 mi)
2017-09-18 [131] 2015 HV1821570.97,700,000,000-5.782.3 AU (340,000,000 km; 210,000,000 mi)2.3 AU (340,000,000 km; 210,000,000 mi)
2017-11-18 [132] 2008 VS4450.083100,000,000-5.504.6 AU (690,000,000 km; 430,000,000 mi)3.9 AU (580,000,000 km; 360,000,000 mi)
2017-11-29 [133] 2007 YM200.132,000,000-5.215.1 AU (760,000,000 km; 470,000,000 mi)5.1 AU (760,000,000 km; 470,000,000 mi)
2017-12-01 [128] 2010 GZ602,000 [lower-alpha 1] 1.310,000,000,000-3.621.0 AU (150,000,000 km; 93,000,000 mi)Not listed
2017-12-13 [134] 2005 TM173531.9230,000,000-5.985.7 AU (850,000,000 km; 530,000,000 mi)5.7 AU (850,000,000 km; 530,000,000 mi)
2017-12-20 [128] 2010 GZ602,000 [lower-alpha 1] 1.383,000,000-1.971.2 AU (180,000,000 km; 110,000,000 mi)Not listed

Notes

  1. 1 2 3 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

Related Research Articles

1994 WR12 is an asteroid and near-Earth object approximately 130 meters (430 feet) in diameter. As a member of the Aten group almost all of its orbit is closer to the Sun than Earth is. On 24 November 1994 it passed about 374100 km from the Moon. First imaged at Kitami Observatory on 26 November 1994, it was discovered two nights later by American astronomer Carolyn S. Shoemaker at Palomar Observatory on 28 November 1994. The asteroid then went unobserved from 1994 until it was recovered by Mauna Kea in March 2016. It was removed from the Sentry Risk Table on 2 April 2016.

(523662) 2012 MU2, provisional designation 2012 MU2, is a sub-kilometer asteroid on an eccentric orbit, classified as near-Earth object and potentially hazardous asteroid of the Apollo group. It was discovered on 18 June 2012 by astronomers of the Catalina Sky Survey at an apparent magnitude of 19.9 using a 0.68-meter (27 in) Schmidt–Cassegrain telescope. It has an estimated diameter of 240 meters (790 ft). The asteroid was listed on Sentry Risk Table with a Torino Scale rating of 1 on 23 June 2012.

(163132) 2002 CU11, provisional designation 2002 CU11, is a bright, sub-kilometer asteroid, classified as near-Earth object and potentially hazardous asteroid of the Apollo group. Based on absolute magnitude, it is the second largest asteroid known to have passed closer than the Moon.

2014 UR116, also known as 2008 XB, is an eccentric sub-kilometer asteroid, categorized as a near-Earth object and potentially hazardous asteroid of the Apollo group with a diameter of approximately 400 meters (1,300 ft). It was first observed on 1 December 2008, by the Mount Lemmon Survey at Mount Lemmon Observatory in Arizona, United States.

2014 OO6 (also written 2014 OO6) is an Apollo near-Earth asteroid discovered in 2014 and was the most dangerous one discovered in 2014 that remained on the Sentry Risk Table as of early December 2014. The asteroid is estimated to be roughly 75 meters (246 ft) in diameter and had a 1 in 83,000 chance of impacting Earth on 11 January 2051. However, the nominal best-fit orbit shows that 2014 OO6 will be 1.5 AU (220,000,000 km; 140,000,000 mi) from Earth on 11 January 2051.

2014 XL7 is a near-Earth object and Apollo asteroid, approximately 230 meters (750 feet) in diameter. It was the most dangerous potentially hazardous asteroid on Sentry Risk Table upon its discovery by the Mount Lemmon Survey in December 2014. At the time, the asteroid had a cumulative 1 in 83000 chance of impacting Earth on 4–5 June between the years 2048 and 2084. After the object's observation arc had been extended to 35 days, it was removed from the Sentry Risk Table on 15 January 2015. Since then the asteroid's orbit has been secured. Although it has an Earth minimum orbit intersection distance of less than one lunar distance, there are no projected close encounters with Earth in the foreseeable future, with its closest passage to occur in May 2046, still millions of kilometers away.

2012 TV is a near-Earth Apollo asteroid with an estimated diameter of 30 metres (98 ft). Its closest approach to the Earth was on October 7, 2012 with a distance of 0.0017 astronomical units. It also approached the Moon an hour earlier with a distance of 0.0028 astronomical units. With a short observation arc of 1.8 days, the asteroid is listed on the Sentry Risk Table and has a 1:500,000 chance of impacting Earth on April 2, 2081.

2013 TX68 is an Apollo asteroid and near-Earth object discovered on 6 October 2013 by the Catalina Sky Survey, during which it was near a close approach of 5.4 Lunar distances (LD) from the Earth. The asteroid only has a 10-day observation arc which makes long-term predictions of its position less certain. It was observed for three days as it approached Earth in the night sky starting with the sixth of October, 2013. Then it became unobservable by being between the Earth and the Sun, then not recovered due to its small size and dimness. Precovery images by Pan-STARRS from 29 September 2013 were announced on 11 February 2016 that extended the observation arc to 10 days. It was removed from the Sentry Risk Table on 11 February 2016, so there is no risk of impact from this object for the next hundred years or more. The asteroid was last observed on 9 October 2013.

<span class="nowrap">2017 OO<sub>1</sub></span>

2017 OO1 is a small asteroid, classified as near-Earth object of the Aten group, approximately 35–76 meters (115–249 feet) in diameter. It was first observed on 23 July 2017, by the robotic ATLAS survey at Mauna Loa Observatory, Hawaii, two days after the object had approached Earth at 0.33 lunar distances on 21 July 2017.

<span class="nowrap">2017 XO<sub>2</sub></span>

2017 XO2, also written 2017 XO2, is a sub-kilometer asteroid and near-Earth object of the Apollo group approximately 110 meters (360 feet) in diameter. The asteroid was discovered by Pan-STARRS in December 2017, after it already had approached Earth at 0.051 AU (7,600,000 km) or 20 lunar distances (LD) on 6 November 2017. On 26 April 2057, it will pass Earth at a similar distance of 21 LD again.

<span class="nowrap">2010 WC<sub>9</sub></span>

2010 WC9, unofficially designated ZJ99C60, is a sub-kilometer near-Earth asteroid of the Apollo group, approximately 100 meters (330 feet) in diameter. First observed for eleven days by the Catalina Sky Survey in 2010, the asteroid was recovered in May 2018 during its sub-lunar close encounter with Earth.

<span class="nowrap">2018 XB<sub>4</sub></span>

2018 XB4 (also written 2018 XB4) is an Apollo near-Earth asteroid roughly 53 meters (170 feet) in diameter. It was discovered on 13 December 2018 when the asteroid was about 0.125 AU (18,700,000 km; 11,600,000 mi) from Earth and had a solar elongation of 146°. It passed closest approach to Earth on 1 January 2019. Of the asteroids discovered in 2018, it had the highest Palermo scale rating at –3.6. In mid-2019 it was recovered which extended the observation arc to 177 days and was removed from the Sentry Risk Table on 12 June 2019. It is now known that on 22 June 2092 the asteroid will pass about 0.033±0.015 AU from Earth.

<span class="mw-page-title-main">2020 LD</span> Near-Earth asteroid

2020 LD is an Apollo near-Earth asteroid roughly 140 meters in diameter. It was discovered on 7 June 2020 when the asteroid was about 0.03 AU from Earth and had a solar elongation of 154 degrees. The glare of the Sun had masked the approach of the asteroid since November 2019. The asteroid passed closest approach to Earth on 5 June 2020 at a distance of 0.002 AU. The close approach distance is now known with an accuracy of roughly ± 1000 km. This is the largest asteroid to pass closer than the Moon this year and possibly the largest since (308635) 2005 YU55 in November 2011. The asteroid makes close approaches to Mercury, Venus, Earth, and Mars. It will be brighter than apparent magnitude 24 until 18 July 2020.

(458732) 2011 MD5 is an Apollo near-Earth asteroid around 1.2 kilometers (0.75 miles) in diameter. It is the largest asteroid known to have passed closer than the Moon. On 17 September 1918 the asteroid passed 0.00234 AU (350 thousand km; 0.91 LD) from Earth with a peak apparent magnitude of around 8.4. The 1918 close approach distance is known with an accuracy of roughly ±200 km. The asteroid had come to opposition (opposite the Sun in the sky) on 9 August 1918 at magnitude 16.

2019 PG1 is a sub-kilometer near-Earth object and potentially hazardous asteroid of the Apollo class, discovered by Pan-STARRS on 8 August 2019, two weeks after it passed Earth at 62 LD. With an observation arc of 103 days, Earth approach dates become divergent by 2042 as the date of closest approach in 2042 has an uncertainty of ±3 days.

2020 XR is an Apollo near-Earth object and potentially hazardous asteroid roughly 390 meters in diameter. With a 5-day observation arc it was briefly listed as having a 1 in 11,000 chance of impacting Earth on 1 December 2028 placing it at the top of the Sentry Risk Table with a Palermo scale rating of -0.70.

2020 AP1 is an Apollo near-Earth object roughly 5 meters (20 feet) in diameter. On 2 January 2020 it passed 0.00218 AU (326 thousand km; 0.85 LD) from Earth. With a short 1-day observation arc it was roughly expected to pass about 0.01 AU (1.5 million km; 3.9 LD) from Earth on 7 January 2022, but with an uncertainty of ±8 days for the close approach date it could have passed significantly closer or further.

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  125. ↑ "171576 (1999 VP11) orbit diagram". JPL Small-Body Database . Jet Propulsion Laboratory. SPK-ID:  2171576.
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  127. 1 2 "NEODyS-2 Ephemerides for 2010XB73". (Close Approaches)
  128. 1 2 3 2010 GZ60 -- Earth Impact Risk Summary (4 missed virtual impactors) "Sentry: Earth Impact Monitoring". Archived from the original on 4 May 2017. Retrieved 7 March 2020.
  129. ↑ 2010 XB73 -- Earth Impact Risk Summary (2 missed virtual impactors) "2010 XB73 Impact Risk". Archived from the original on 26 January 2016. Retrieved 28 January 2018.
  130. ↑ 2015 ME131 -- Earth Impact Risk Summary "2015 ME131 Impact Risk". Archived from the original on 1 August 2015. Retrieved 28 January 2018.
  131. ↑ 2015 HV182 -- Earth Impact Risk Summary (4 missed virtual impactors) "2015 HV182 Impact Risk". Archived from the original on 3 July 2015. Retrieved 28 January 2018.
  132. ↑ 2008 VS4 -- Earth Impact Risk Summary (21 missed virtual impactors) "2008 VS4 Impact Risk". Archived from the original on 17 January 2009. Retrieved 28 January 2018.
  133. ↑ 2007 YM -- Earth Impact Risk Summary (3 missed virtual impactors) "2007 YM Impact Risk". Archived from the original on 3 January 2008. Retrieved 28 January 2018.
  134. ↑ 2005 TM173 -- Earth Impact Risk Summary (17 missed virtual impactors) "2005 TM173 Impact Risk". Archived from the original on 31 December 2005. Retrieved 28 January 2018.
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