3 newly discovered asteroids flew past Earth within 1 lunar distance on September 21

3 newly discovered asteroids flew past Earth within 1 lunar distance on September 21

Three newly discovered asteroids, designated 2019 SU2, 2019 SD1 and 2019 SS2, flew past Earth within 1 lunar distance on September 21. All three of them belong to the Apollo group of asteroids and all three of them were first observed at Mt. Lemmon Survey, Arizona. Their discovery pushed the number of known <1 LD asteroid flybys this month to 7.

2019 SU2 was first observed on September 22, one day after its close approach. Its estimated diameter is between 2.7 and 6.1 m (8.8 - 20 feet) and it flew past Earth at 02:48 UTC at a distance of 0.19 LD / 0.00048 AU (71 806 km / 44 618 miles).

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

2019 SU2 at Minor Planet Center; CNEOS

2019 SD1 was first observed on September 20, one day before the object made its close approach to Earth. 

Its estimated diameter is between 5.5 and 12 m (18 - 39 feet). The object flew past us at 06:46 UTC at a distance of 0.73 LD / 0.00187 AU (279 748 km / 173 827 miles).

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

2019 SD1 at Minor Planet Center; CNEOS

2019 SS2 was first observed on September 22, one day after it made its close approach to Earth. 

The object has an estimated diameter between 2 and 4.4 m (6.5 - 14.4 feet) and it flew past us at 07:12 UTC at a distance of 0.30 LD / 0.00077 AU (115 190 km / 71 575 miles).

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

Asteroid 2019 SS2 at Minor Planet Center; CNEOS

​A total of 46 known asteroids flew past Earth within 1 lunar distance since the start of the year. 

 

NEO DATE / TIME UTC DISTANCE LD | AU  Diameter (m)
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

 

Featured image credit: CNEOS

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