Asteroid 2011 ES4 to flyby Earth at 0.32 LD

asteroid-2011-es4

An asteroid designated 2011 ES4 will make a close approach to Earth at just 0.32 LD / 0.00048 AU (71 806 km / 44 618 miles) at 16:12 UTC on September 1, 2020. This is the 60th known asteroid to flyby Earth within 1 lunar distance since the start of the year.

This Apollo-class asteroid was first observed at Mt. Lemmon Survey, Arizona on March 2, 2011. Its diameter is between 22 and 49 m (72 – 160 feet), comparable to the Chelyabinsk asteroid of 2013. 

The flyby will take place at 16:12 UTC at a speed (relative to the Earth) of 8.16 km/s.

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]

Some of you will remember the Chelyabinsk asteroid which entered Earth's orbit some 18 hours before the expected flyby of asteroid 2012 DA14, surprising the entire world after it exploded over a populated area in Russia.

The asteroid exploded some 29.7 km (18.5 miles) above the Russian city of Chelyabinsk (hence the name) at 09:20 YEKT (03:20 UTC) on February 15, 2013, damaging over 3 000 buildings and injuring over 1 500 people (mostly by broken window glass).

The asteroid was undetected before its atmospheric entry, in part because its radiant was too close to the Sun. It's still regarded as the biggest asteroid airburst since the 1908 Tunguska event.

Check your speakers. Loud asteroid explosion on video.

This is how the object's entry looked like from space:

In the hours following the visual meteor sighting, a 6-meter (20 feet) wide hole was discovered on Lake Chebarkul's frozen surface and scientists from the Ural Federal University collected 53 samples from around the hole the same day it was discovered.

In June 2013, Russian scientists reported that further investigation by magnetic imaging below the location of the ice hole in Lake Chebarkul had identified a 60 cm (2 feet) wide meteorite buried in the mud at the bottom of the lake. Following an operation lasting a number of weeks, it was raised from the bottom on October 16, 2013. With a total mass of 654 kg (1 442 lb), this is the largest found fragment of the Chelyabinsk meteorite.

In November 2013, a video from a security camera was released showing the impact of the fragment at the Chebarkul Lake. From the measured time difference between the shadow generating meteor to the moment of impact, scientists calculated that this meteorite hit the ice at about 225 meters per second, 64 percent of the speed of sound.

This is the world's first recorded impact of a meteorite on video:

Video shows the first recorded impact of a meteorite. Chelyabinsk, Russia February 15, 2017

Asteroids detected within 1 lunar distance in 2020 (valid 16:29 UTC, August 31):

NEO DATE / TIME UTC DISTANCE LD | AU  Diameter (m)
2011 ES4 September 1 @ 16:12 ± < 00:01 0.32 | 0.00081 22 – 49
2020 QR5 August 23 @ 04:20 ± < 00:01  0.83 | 0.00214 9.2 – 21
2020 QQ4 August 22 @ 23:18 ± < 00:01 0.80 | 0.00206 4.6 – 10
2020 QN4 August 21 @ 04:23 ± < 00:01 0.71 | 0.00182 5 – 11
2020 QY2 August 20 @ 23:50 ± < 00:01 0.17 | 0.00044 1.6 – 3.6
2020 PY2 August 20 @ 21:29 ± < 00:01 0.91 | 0.00234 12 – 27
2020 QF2 August 18 @ 01:41 ± < 00:01 0.55 | 0.00140 7.1 – 16
2020 QG August 16 @ 04:09 ± < 00:01 0.02 | 0.0000623* 2.9 – 6.4
2020 PW2 August 14 @ 04:25 ± < 00:01 0.73 | 0.00187 4.9 – 11
2020 QJ5 August 12 @  ± < 00:01 0.77 | 0.00197 12 – 26
2020 PX5 August 11 @ 08:45 ± < 00:01 0.59 | 0.00153 3.2 – 7.2
2020 PA August 1 @ 01:56 ± < 00:01 0.15 | 0.00039 4.6 – 10
2020 OY4 July 28 @ 05:32  ± < 00:01 0.11 | 0.00028 2.3 – 5.2
2020 NB July 5 @ 21:21 ± < 00:01 0.46 | 0.00119 15 – 33
2020 ML2 June 13 @ 04:45 ± < 00:01 0.93 | 0.00238 6.7 – 15
2020 LD June 5 @ 08:25 ± 00:05  0.80 | 0.00205 89 – 200
2020 KC5 May 29 @ 20:46 ± < 00:01 0.97 | 0.00248 9.1 – 20
2020 KJ4 May 28 @ 13:21 ± < 00:01 0.37 | ​0.00096 2.8 – 6.2
2020 KF5 May 28 @ 12:47 ± < 00:08 0.64 | 0.00165 3.5 – 7.8
2020 JN May 5 @ 03:22 ± < 00:01 0.65 | ​0.00167 9 – 20
2020 JJ May 4 @ 12:05 ± < 00:01 0.03 | 0.0000896 2.7 – 6
2020 JA May 3 @ 20:01 ± < 00:01 0.62 | 0.00160 9.6 – 22
2020 JG April 30 @ 19:38 ± 00:02 0.56 | 0.00143 18 – 41
2020 HS7 April 28 @ 18:51 ± < 00:01 0.11 | 0.00029 4 – 8.9
2020 HP6 April 27 @ 14:40 ± < 00:01 0.33 | 0.00084 6.7 – 15
2020 HT8 April 26 @ 13:33 ± 00:01 0.38 | 0.00099 5.8 – 13
2020 HX3 April 24 @ 19:38 ± < 00:01 0.66 | 0.00169 11 – 24
2020 HU7 April 22 @ 20:19 ± < 00:01 0.34 | 0.00087 3.1 – 7
2020 HF5 April 22 @ 16:41 ± < 00:01 0.38 | 0.00098  12 – 27
2020 HM6 April 22 @ 05:51 ± 00:05 0.42 | 0.00109 13 – 28
2020 GH2 April 15 @ 12:45 ± 00:50 0.93 | 0.00240 13 – 30
2020 HO April 15 @ 10:06 ± 00:01  0.75 | 0.00193 4.6 – 10
2020 GY1 April 5 @ 07:37 ± < 00:01 0.21 | 0.00054 13 – 28
2020 GH April 3 @ 22:04 ± < 00:01 0.33 | 0.00084 4.1 – 9.2
2020 GO1 April 1 @ 19:09 ± < 00:01 0.18 | 0.00046 7.9 – 18
2020 FB7 March 31 @ 16:17 ± < 00:01 0.20 | 0.00052 16 -36
2020 FJ4 March 25 @ 13:42 ± < 00:01 0.67 | 0.00172 3.4 – 7.6
2020 FL2 March 22 @ 20:32 ± < 00:01 0.38 | 0.00099 15 – 33
2020 FG4 March 19 @ 00:51 ± 00:01 0.49 | 0.00126 10 – 23
2020 FD March 18 @ 04:05 ± < 00:01 0.67 | 0.00171 7.8 – 17
2020 FD2 March 18 @ 20:17 ± 00:31 0.85 | 0.00219 20 – 44
2020 DR4 February 24 @ 20:30 ± 00:03 0.24 | 0.00062 3 – 6.8
2020 DW February 18 @ 17:02 ± < 00:01 0.63 | 0.00161 2.3 – 5.1
2020 DA1 February 18 @ 10:32 ± < 00:01 0.50 | 0.00129 3.1 – 6.8
2020 CQ2 February 14 @ 02:19 ± < 00:01 0.39 | 0.00099 5 – 11
2020 CD3 February 13 @ 16:20 ± < 00:01 0.12 | 0.00031 1.2 – 2.7
2020 DU February 13 @ 13:22 ± 00:06 0.85 | 0.00217 4.9 – 11
2020 CQ1 February 4 @ 11:16 ± 00:02 0.17 | 0.00043 4.6 – 10
2020 BT14 February 3 @ 08:19 ± < 00:01 0.49 | 0.00126 7.9 – 18
2020 CA February 2 @ 15:49 ± 00:02 0.57 | 0.00147 3.2 – 7.2
2020 CW February 1 @ 12:50 ± < 00:01  0.04 | 0.00011 0.83 – 1.9
2020 CJ January 31 @ 19:03 ± < 00:01  0.92 | 0.00236 11 – 24
2020 CZ January 31 @ 03:51 ± 00:48 0.82 | 0.00210 3.7 – 8.2
2020 BZ13 January 29 @ 01:18 ± < 00:01 0.28 | 0.00071 2.9 – 6.5
2020 BA15 January 28 @ 18:03 ± 00:02 0.98 | ​0.00251 8.9 – 20
2020 BA13 January 27 @ 16:56 ± < 00:01  0.51 | ​0.00132 4.7 – 11
2020 BH6 January 25 @ 05:11 ± < 00:01 0.18 | ​0.00047 5.2 – 12
2020 BB5 January 22 @ 00:20 ± 00:20 0.69 | 0.00177 3.3 – 7.4
2020 BK3 January 20 @ 20:51 ± 00:05 0.78 | 0.00200 11 – 25
2020 AP1 January 2 @ 15:33  ± 00:02 0.85 | 0.00218 3.2 – 7.2

*Closest asteroid flyby on record

Asteroids detected within 1 lunar distance in 2019:

NEO DATE / TIME UTC DISTANCE LD | AU  Diameter (m)
2019 YV4 December 25 @ 21:41 ± 11:01 0.98 | 0.00251 9.3 – 21
2019 YU2 December 23 @ 19:28 ± < 00:01 0.26 | 0.00066 8.9 – 20
2019 YS December 18 @ 15:12 ± < 00:01 0.17 | 0.00044 1.3 – 3
2019 YB December 18 @ 00:12 ± 00:03  0.44 | 0.00113 3.1 – 7
2019 WJ4 November 30 @ 20:05 ± < 00:01 0.85 | 0.00219 5.5 – 12
2019 WG2 November 23 @ 08:44 ± < 00:01 0.47 | 0.00121 26 – 59
2019 WV1 November 19 @ 23:45 ± 03:13 0.72 | ​0.00186 6.3 – 14
2019 WH November 19 @ 08:01 ± < 00:01 0.22 | ​0.00057 16 – 36
2019 VF5 November 9 @ 23:16 ± < 00:01 0.49 | 0.00127 8.3 – 19
2019 VB5 November 9 @ 17:29 ± < 00:01 0.38 | 0.00097 1.2 – 2.7
2019 VS4 November 6 @ 16:28 ± < 00:01 0.36 | 0.00093 9.3 – 21
2019 VR November 4 @ 10:35 ± < 00:01 0.35 | 0.00091 6.5 – 14
2019 VD November 4 @ 09:55 ± 00:01 0.45 | 0.00116 8.7 – 19
2019 VA November 2 @ 17:41 ± 00:12  0.28 | 0.00072 5.6 – 12
2019 UG11 November 1 @ 20:42 ± 00:02 0.55 | 0.00140 13 – 29
2019 UN13 October 31 @ 14:45 ± < 00:01 0.03 | 8.43e-5 1 – 2.2
2019 UB8 October 29 @ 06:30 ± 00:03 0.50 | 0.00127 4 – 8.9
2019 UD10 October 27 @ 10:08 ± 00:02 0.44 | 0.00112 6.3 – 14
2019 UX12 October 26 @ 03:08 ± 00:04 0.99 | 0.00255 4.9 – 11
2019 UO8 October 25 @ 13:30 ± 00:01 0.41 | 0.00105 3.1 – 6.9
2019 UN8 October 23 @ 16:41 ± 00:17 0.93 | 0.00235  3.1 – 6.9
2019 UL3 October 19 @ 22:23 ± 00:08 0.77 | 0.00199 6 – 13
2019 UG October 18 @ 09:23 ± < 00:01 0.84 | 0.00215 6.8 – 15
2019 UU1 October 18 @ 06:23 ± < 00:01 0.59 | 0.00150 2.1 – 5.1
2019 TN5 October 5 @ 22:38 ± < 00:01 0.32 | 0.00083 5.5 – 12
2019 SP3 October 3 @ 06:36 ± 00:34 0.97 | 0.00248 13 – 30
2019 SM8 October 1 @ 13:56 ± < 00:01  0.41 | ​0.00106 3.8 – 8.6
2019 TD September 29 @ 18:50 ± 00:13 0.34 | ​0.00087 4.1 – 9.1
2019 TE September 28 @ 20:31 ± 01:31 0.93 | 0.00238 6.8 – 15
2019 SX8 September 28 @ 07:49 ± 00:38 0.99 | 0.00255 4.6 – 10
2019 SS3 September 22 @ 22:48 ± 00:21 0.73 | 0.00188 15 – 34
2019 SS2 September 21 @ 07:12 ± 00:02 0.30 | ​0.00077 2 – 4.4
2019 SD1 September 21 @ 06:46 ± < 00:01  0.73 | 0.00187 5.5 – 12
2019 SU2 September 21 @ 02:48 ± 00:05 0.19 | 0.00048 2.7 – 6.1
2019 SJ September 16 @ 18:55 ± 00:03 0.64 | 0.00163 8.6 – 19
2019 RC1 September 7 @ 10:48 ± 00:04 0.48 | ​0.00123 4.5 – 10
2019 RP1 September 5 @ 22:04 ± < 00:01  0.10 | ​0.00025 7.4 – 17
2019 RQ September 2 @ 16:45 ± < 00:01  0.29 | ​0.00074 2.1 – 4.6
2019 QQ3 August 26 @ 15:14 ± 00:01 0.25 | 0.00064 3.7 – 8.2
2019 QR8 August 26 @ 08:51 ± 01:08 0.80 | 0.00207 6.6 – 15
2019 QD August 22 @ 01:28 ± < 00:08  0.78 | 0.00200 4.7 – 11
2019 QH2 August 20 @ 18:12 ± 00:08 0.13 | 0.00033 2.2 – 5
2019 QB1 August 20 @ 11:55 ± 00:08 0.32 | 0.00082 9.3 – 21
2019 ON3 July 29 @ 01:19 ±  00:14 0.56 | 0.00143 7.4 – 16
2019 OD3 July 28 @ 02:56 ± < 00:01 0.49 | 0.00126 11 – 25
2019 OK July 25 @ 01:22 ± < 00:04 0.19 | ​0.00048 57 – 130
2019 OD July 24 @ 13:31 ± 00:04 0.93 | ​0.00239 54 – 120
2019 NN3 July 10 @ 16:29 ± < 00:01 0.83 | 0.00214 35 – 77
2019 NF7 July 9 @ 12:07 ± < 00:01  0.98 | 0.00253 6.4 – 14
2019 MB4 July 9 @ 07:20 ± < 00:01 0.82 | 0.00211 17 – 38
2019 NK1 July 2 @ 09:48 ± 00:05 0.69 | 0.00177 2.9 – 6.5
2019 LW4 June 8 @ 17:04 ± < 00:01 0.65 | ​​0.00166 9.3 – 21
2019 LY4 June 6 @ 01:30 ± < 00:01 0.22 | ​​0.00056 7.3 – 16
2019 KT May 28 @ 03:48 ± < 00:01 0.85 | ​0.00217 13 – 29
2019 JH2 May 16 @ 00:06 ± < 00:01 0.19 | ​0.00048 3.1 – 7
2019 JY2 May 5 @ 17:12 ± < 00:01 0.38 | 0.00098 3.3 – 7.3
2019 JX1 May 2 @ 12:39 ± 00:02 0.47 | 0.00120 3.8 – 8.6
2019 JK April 30 @ 08:12 UTC ± 00:01 0.69 | 0.00178 7.1 – 16
2019 HE April 20 @ 21:12 ± < 00:01 0.58 | 0.00149 13 – 30
2019 GC6 April 18 @ 06:39 ± 00:29 0.57 | 0.00147 13 – 28
2019 GN20 April 12 @ 07:06 ± < 00:01 0.98 | 0.00253 14 – 31
2019 FP21 March 31 @ 19:00  ±  07:46 0.93 | 0.00238 3 – 6.6
2019 FV1 March 31 @ 05:27 ± < 00:01 0.87 | 0.00223 4.6 – 10
2019 FC1 March 28 @ 05:46 ± < 00:01 0.27 | 0.00069 20 – 45
2019 FQ March 23 @ 18:17 UTC ± < 00:01 0.86 | 0.00220 10 – 23
2019 EA2 March 22 @ 01:53 UTC ± 00:02 0.80 | 0.00205 18 – 40
2019 FA March 16 @ 01:14 UTC ± < 00:01 0.60 | 0.00154 4.9 – 11
2019 EN2 March 13 @ 23:38 UTC ± < 00:01 0.86 | 0.00221 8 – 18
2019 EH1 March 1 @ 17:38 UTC ± < 00:01 0.06 | 0.00016 2.5 – 5.7
2019 DF February 26 @ 21:21 UTC  ± 00:09 0.47 | 0.00120 3.0 – 6.7
2019 DG2 Febraury 26 @ 07:39 UTC ± 07:39 0.61 | 0.00158 5.4 – 12
2019 CN5 February 11 @ 07:23 UTC ± 00:03 0.31 | 0.00079 7.3 – 16
2019 BZ3 January 27 @ 23:29 ± < 00:01 0.13 | 0.00032  4.8 – 11
2019 BV1 January 24 @ 20:53 ± < 00:01 0.35 | 0.00090  4.8 – 11
2019 BO January 16 @ 01:13 ± 00:02 0.18 | 0.00046  6.3 – 14
2019 AE9 January 12 @ 11:09 ± < 00:01 0.26 | 0.00067  9.9 – 22
2019 AS5 January 8 @ 00:37 ± < 00:01 0.04 | 0.00010  0.92 – 2.1

 

Reference

Asteroid 2011 ES4 at Minor Planet Center; at CNEOS

Featured image credit: MPC

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