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List of asteroid close approaches to Earth in 2021

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Time of discovery of asteroids which passed within 1 lunar distance from Earth in 2021
After closest approach: 70 (45.5%)< 24 hours before: 33 (21.4%)up to 7 days before: 50 (32.5%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 1 (0.6%)
  •   After closest approach: 70 (45.5%)
  •   < 24 hours before: 33 (21.4%)
  •   up to 7 days before: 50 (32.5%)
  •   > one week before: 0 (0.0%)
  •   > 7 weeks before: 0 (0.0%)
  •   > one year before: 1 (0.6%)
Other Years
2019, 2020, 2021, 2022, 2023
Counts of confirmed asteroids which were discovered on their 2021 close approach, by discoverer
G96 Mt. Lemmon Survey: 53 (37.3%)F51 Pan-STARRS 1, Haleakala: 17 (12.0%)T05 ATLAS-HKO, Haleakala: 13 (9.2%)703 Catalina Sky Survey: 12 (8.5%)T08 ATLAS-MLO, Mauna Loa: 11 (7.7%)I41 ZTF, Palomar Mountain: 10 (7.0%)381 Tokyo-Kiso: 9 (6.3%)K88 GINOP-KHK, Piszkesteto: 6 (4.2%)W94 MAP, San Pedro de Atacama: 5 (3.5%)F52 Pan-STARRS 2, Haleakala: 4 (2.8%)V00 Kitt Peak-Bok: 2 (1.4%)
  •   G96 Mt. Lemmon Survey: 53 (37.3%)
  •   F51 Pan-STARRS 1, Haleakala: 17 (12.0%)
  •   T05 ATLAS-HKO, Haleakala: 13 (9.2%)
  •   703 Catalina Sky Survey: 12 (8.5%)
  •   T08 ATLAS-MLO, Mauna Loa: 11 (7.7%)
  •   I41 ZTF, Palomar Mountain: 10 (7.0%)
  •   381 Tokyo-Kiso: 9 (6.3%)
  •   K88 GINOP-KHK, Piszkesteto: 6 (4.2%)
  •   W94 MAP, San Pedro de Atacama: 5 (3.5%)
  •   F52 Pan-STARRS 2, Haleakala: 4 (2.8%)
  •   V00 Kitt Peak-Bok: 2 (1.4%)
Prediction accuracy for asteroids of magnitude 27 or larger nominally predicted to pass within 1 lunar distance of Earth in 2021[note 1]
Unpredicted: 11 (91.7%)Predicted but not observed: 1 (8.3%)Observed but details incorrect: 0 (0.0%)Distance correct but not date: 0 (0.0%)Date correct but not distance: 0 (0.0%)Successfully predicted: 0 (0.0%)
  •   Unpredicted: 11 (91.7%)
  •   Predicted but not observed: 1 (8.3%)
  •   Observed but details incorrect: 0 (0.0%)
  •   Distance correct but not date: 0 (0.0%)
  •   Date correct but not distance: 0 (0.0%)
  •   Successfully predicted: 0 (0.0%)

Below is the list of asteroids that have come close to Earth in 2021.

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

[edit]

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 2021.[1]

For reference, the radius of Earth is about 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.

The largest asteroid to pass within 1 LD of Earth in 2021 was 2021 SG with an estimated diameter of around 68 meters and an absolute magnitude of 24.0. The fastest asteroid to pass within 1 LD of Earth in 2021 was 2021 UA7 that passed Earth with a velocity with respect to Earth of 27.7 km/s (62,000 mph).[2][note 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 		Discovery[note 3] Object Nominal geocentric distance[note 4] Approx.
size (m) 		(H)
(abs. mag) 		Closer
approach
to Moon
[note 5]
(AU) (Lunar
distance)
[note 6]
2021-01-01[3] 2021-01-02
G96 Mt. Lemmon Survey[4]		 2021 AA 0.00159 AU (238,000 km; 148,000 mi) 0.62 11–24 27.0 —
2021-01-03[5] 2021-01-03
703 Catalina Sky Survey[6]		 2021 AH 0.00033 AU (49,000 km; 31,000 mi) 0.13 5.3–12 28.5 —
2021-01-04[7] 2021-01-05
G96 Mt. Lemmon Survey[8]		 2021 AH8 0.00035 AU (52,000 km; 33,000 mi) 0.14 3.2–7.2 29.6 —
2021-01-09[9] 2021-01-08
G96 Mt. Lemmon Survey[10]		 2021 AS2 0.00072 AU (108,000 km; 67,000 mi) 0.28 3.2–7.2 29.6 —
2021-01-16[11] 2021-01-18
G96 Mt. Lemmon Survey[12]		 2021 BR2 0.00049 AU (73,000 km; 46,000 mi) 0.19 1.8–4.1 30.8 —
2021-01-18[13] 2021-01-17
G96 Mt. Lemmon Survey[14]		 2021 BK 0.00075 AU (112,000 km; 70,000 mi) 0.29 2.3–5.2 30.3 —
2021-01-18[15] 2021-01-17
703 Catalina Sky Survey[16]		 2021 BV1 0.00161 AU (241,000 km; 150,000 mi) 0.62 6.6–15 28.0 —
2021-01-18[17] 2021-01-17
G96 Mt. Lemmon Survey[18]		 2021 BO 0.00016 AU (24,000 km; 15,000 mi) 0.06 0.68–1.5 33.0 —
2021-01-20[19] 2021-01-18
G96 Mt. Lemmon Survey[20]		 2021 BO1 0.00168 AU (251,000 km; 156,000 mi) 0.65 3.8–8.6 29.2 —
2021-01-26[21] 2018-01-18[22] 2018 BA3 0.00250 AU (374,000 km; 232,000 mi) 0.97 14–31 26.4 —
2021-02-04[23] 2021-02-05
703 Catalina Sky Survey[24]		 2021 CV 0.00135 AU (202,000 km; 125,000 mi) 0.52 4.4–9.9 28.9 —
2021-02-09[25] 2021-02-09
I41 Palomar Mountain—ZTF[26]		 2021 CZ3 0.00015 AU (22,000 km; 14,000 mi) 0.06 1.7–3.8 31.0 —
2021-02-11[27] 2021-02-05
703 Catalina Sky Survey[28]		 2021 CO 0.00242 AU (362,000 km; 225,000 mi) 0.94 23–52 25.3 —
2021-02-11[29] 2021-02-11
703 Catalina Sky Survey[30]		 2021 CQ5 0.00119 AU (178,000 km; 111,000 mi) 0.46 5.1–11 28.6 —
2021-02-12[31] 2021-02-11
V00 Kitt Peak-Bok[32]		 2021 CC6 0.00113 AU (169,000 km; 105,000 mi) 0.44 2.5–5.5 30.1 —
2021-02-12[33] 2021-02-12
381 Tokyo-Kiso[34]		 2021 CC7 0.00217 AU (325,000 km; 202,000 mi) 0.84 3.0–6.7 29.7 —
2021-02-13[35] 2021-02-10
F51 Pan-STARRS 1, Haleakala[36]		 2021 CA6 0.00111 AU (166,000 km; 103,000 mi) 0.43 5.2–12 28.6 —
2021-02-14[37] 2021-02-12
T08 ATLAS-MLO, Mauna Loa[38]		 2021 CS6 0.00100 AU (150,000 km; 93,000 mi) 0.39 7.3–16 27.8 —
2021-02-14[39] 2021-02-13
K88 GINOP-KHK, Piszkesteto[40]		 2021 CW7 0.00019 AU (28,000 km; 18,000 mi) 0.07 1.5–3.4 31.2 —
2021-02-18[41] 2021-02-18
I41 Palomar Mountain—ZTF[42]		 2021 DN1 0.00226 AU (338,000 km; 210,000 mi) 0.88 6.3–14 28.1 —
2021-02-18[43] 2021-02-17
G96 Mt. Lemmon Survey[44]		 2021 DG 0.00111 AU (166,000 km; 103,000 mi) 0.43 2.2–4.9 30.4 —
2021-02-21[45] 2021-02-22
K88 GINOP-KHK, Piszkesteto[46]		 2021 DA2 0.00132 AU (197,000 km; 123,000 mi) 0.51 3.9–8.7 29.2 —
2021-03-01 2021-03-02 ZTF0KfF 0.00187 AU (280,000 km; 174,000 mi) 0.73[note 7] 0.96–5.9 31.0 ?[47]
2021-03-02[48] 2021-03-01
K88 GINOP-KHK, Piszkesteto[49]		 2021 EA 0.00063 AU (94,000 km; 59,000 mi) 0.24 6.3–14 28.1 —
2021-03-07 2021-03-06 C4YK182 0.000632 AU (94,500 km; 58,700 mi) 0.25[note 8] 1.8–5.9 30.3 —[50]
2021-03-08[51] 2021-03-06
G96 Mt. Lemmon Survey[52]		 2021 EF1 0.00187 AU (280,000 km; 174,000 mi) 0.73 3.1–6.8 29.7 ✓
2021-03-09[53] 2021-03-10
G96 Mt. Lemmon Survey[54]		 2021 EG3 0.00098 AU (147,000 km; 91,000 mi) 0.38 3.8–8.6 29.2 —
2021-03-10 2021-03-11 ScKo07a 0.0013 AU (190,000 km; 120,000 mi) 0.51[note 9] 0.97–5.9 31.0 —[55]
2021-03-15[56] 2021-03-15
T08 ATLAS-MLO, Mauna Loa[57]		 2021 EN4 0.00047 AU (70,000 km; 44,000 mi) 0.18 3.1–6.9 29.7 —
2021-03-15[58] 2021-03-15
381 Tokyo-Kiso[59]		 2021 EP4 0.00248 AU (371,000 km; 231,000 mi) 0.97 3.7–8.4 29.3 —
2021-03-16[60] 2021-03-11
G96 Mt. Lemmon Survey[61]		 2021 EQ3 0.00186 AU (278,000 km; 173,000 mi) 0.72 16–36 26.1 ✓
2021-03-20[62] 2021-03-22
G96 Mt. Lemmon Survey[63]		 2021 FM2 0.00056 AU (84,000 km; 52,000 mi) 0.22 2.5–5.7 30.1 —
2021-03-21[64] 2021-03-22
G96 Mt. Lemmon Survey[65]		 2021 FF2 0.00213 AU (319,000 km; 198,000 mi) 0.83 6.3–14 28.1 —
2021-03-23 2021-03-23 B03SK22 0.00019 AU (28,000 km; 18,000 mi) 0.074[note 10] 0.38–2.4 33.0 —[66]
2021-03-23[67] 2021-03-20
G96 Mt. Lemmon Survey[68]		 2021 FO1 0.00215 AU (322,000 km; 200,000 mi) 0.84 3.4–7.6 29.5 —
2021-03-23[69] 2021-03-18
G96 Mt. Lemmon Survey[70]		 2021 FH 0.00157 AU (235,000 km; 146,000 mi) 0.61 12–27 26.7 —
2021-03-23[71] 2021-03-22
G96 Mt. Lemmon Survey[72]		 2021 FP2 0.00216 AU (323,000 km; 201,000 mi) 0.84 2.5–5.6 30.1 —
2021-04-01 2021-04-01 A10w8qG 0.00149 AU (223,000 km; 139,000 mi) 0.58[note 11] 3.2–12 28.9 ✓[73]
2021-04-03[74] 2021-04-04
G96 Mt. Lemmon Survey[75]		 2021 GE2 0.00161 AU (241,000 km; 150,000 mi) 0.62 3.9–8.8 29.1 —
2021-04-03 2021-04-06 P11ekJ0 0.00188 AU (281,000 km; 175,000 mi) 0.73[note 12] 2.9–18 28.6 —[76]
2021-04-04[77] 2021-04-03
G96 Mt. Lemmon Survey[78]		 2021 GV 0.00224 AU (335,000 km; 208,000 mi) 0.87 3.8–8.6 29.2 —
2021-04-05[79] 2021-04-03
G96 Mt. Lemmon Survey[80]		 2021 GS 0.00167 AU (250,000 km; 155,000 mi) 0.65 4.8–11 28.7 —
2021-04-05[81] 2021-04-05
I41 Palomar Mountain—ZTF[82]		 2021 GZ7 0.00126 AU (188,000 km; 117,000 mi) 0.49 4.3–9.6 28.9 ✓
2021-04-06 2021-04-07 P11eyxx 0.00024 AU (36,000 km; 22,000 mi) 0.093[note 13] 1.4–5.4 30.7 —[83]
2021-04-08 2021-04-07 A10wiOp 0.00224 AU (335,000 km; 208,000 mi) 0.87[note 14] 2.8–17 28.7 —[84]
2021-04-08[85] 2021-04-08
381 Tokyo-Kiso[86]		 2021 GV4 0.00212 AU (317,000 km; 197,000 mi) 0.82 4.3–9.6 29.0 —
2021-04-09[87] 2021-04-11
T08 ATLAS-MLO, Mauna Loa[88]		 2021 GL16 0.00247 AU (370,000 km; 230,000 mi) 0.96 15–33 26.3 ✓
2021-04-10[89] 2021-04-06
F51 Pan-STARRS 1, Haleakala[90]		 2021 GT3 0.00171 AU (256,000 km; 159,000 mi) 0.67 14–32 26.4 —
2021-04-10 2021-04-10 TMG0042 0.00220 AU (329,000 km; 205,000 mi) 0.85[note 15] 4.4–14.3 28.4 —[91]
2021-04-11[92] 2021-04-10
703 Catalina Sky Survey[93]		 2021 GQ5 0.00248 AU (371,000 km; 231,000 mi) 0.97 5.3–12 28.5 —
2021-04-11 2021-04-11 TMG0044 0.00126 AU (188,000 km; 117,000 mi) 0.49[note 16] 2.5–9.9 29.4 —[94]
2021-04-11 2021-04-07 P11exfR 0.00244 AU (365,000 km; 227,000 mi) 0.95[note 17] 3.1–19 28.5 —[95]
2021-04-11 2021-04-11 TMG0045 0.00156 AU (233,000 km; 145,000 mi) 0.61[note 18] 3.7–12 28.8 —[96]
2021-04-11[97] 2021-04-11
381 Tokyo-Kiso[98]		 2021 GA168 0.00156 AU (233,000 km; 145,000 mi) 0.61 4.6–10 28.8 —
2021-04-12[99] 2021-04-08
G96 Mt. Lemmon Survey[100]		 2021 GW4 0.00018 AU (27,000 km; 17,000 mi) 0.07 3.4–7.6 29.5 —
2021-04-13[101] 2021-04-13
I41 Palomar Mountain—ZTF[102]		 2021 GC13 0.00228 AU (341,000 km; 212,000 mi) 0.89 4.0–8.9 29.1 —
2021-04-13 2021-04-13 ZTF0KwS 0.00105 AU (157,000 km; 98,000 mi) 0.41[note 19] 2.4–15 29.0 ?[103]
2021-04-13[104] 2021-04-11
V00 Kitt Peak-Bok[105]		 2021 GC8 0.00146 AU (218,000 km; 136,000 mi) 0.57 2.0–4.5 30.6 —
2021-04-14[106] 2021-04-14
381 Tokyo-Kiso[107]		 2021 GQ10 0.00116 AU (174,000 km; 108,000 mi) 0.45 12–28 26.6 —
2021-04-14[108] 2021-04-15
T08 ATLAS-MLO, Mauna Loa[109]		 2021 GW16 0.00020 AU (30,000 km; 19,000 mi) 0.08 2.5–5.7 30.1 —
2021-04-15[110] 2021-04-17
T05 ATLAS-HKO, Haleakala[111]		 2021 HC1 0.00155 AU (232,000 km; 144,000 mi) 0.60 6.8–15 28.0 ✓
2021-04-15[112] 2021-04-14
W94 MAP, San Pedro de Atacama[113]		 2021 GF10 0.00077 AU (115,000 km; 72,000 mi) 0.30 6.2–14 28.2 —
2021-04-15[114] 2021-04-14
F51 Pan-STARRS 1, Haleakala[115]		 2021 GN10 0.00192 AU (287,000 km; 178,000 mi) 0.75 5.6–12 28.4 ✓
2021-04-16 2021-04-17 ZTF0KyD 0.00213 AU (319,000 km; 198,000 mi) 0.83[note 20] 3.2–20 28.4 ?[116]
2021-04-17[117] 2021-04-18
703 Catalina Sky Survey[118]		 2021 HE1 0.00153 AU (229,000 km; 142,000 mi) 0.59 4.4–9.7 28.9 ✓
2021-04-17 2021-04-14 P11f7ua 0.00108 AU (162,000 km; 100,000 mi) 0.42[note 21] 2.9–9.4 29.3 —[119]
2021-04-17 2021-04-17 B04SK17 0.00106 AU (159,000 km; 99,000 mi) 0.41[note 22] 3.1–30 28.0 ?[120]
2021-04-19[121] 2021-04-17
G96 Mt. Lemmon Survey[122]		 2021 HN 0.00170 AU (254,000 km; 158,000 mi) 0.66 11–25 26.9 —
2021-04-23 2021-04-25 A10wMMp 0.000735 AU (110,000 km; 68,300 mi) 0.29[note 23] 2.5–16 28.9 ?[123]
2021-04-24 2021-04-24 ZTF0Kzz 0.0016 AU (240,000 km; 150,000 mi) 0.62[note 24] 1.2–7.5 30.5 ?[124]
2021-05-02 2021-05-02 S514008 0.00079 AU (118,000 km; 73,000 mi) 0.31[note 25] 2.4–15 29.0 ?[125]
2021-05-02[126] 2021-05-03
T05 ATLAS-HKO, Haleakala[127]		 2021 JW 0.00173 AU (259,000 km; 161,000 mi) 0.67 8.0–18 27.6 —
2021-05-04[128] 2021-05-03
T05 ATLAS-HKO, Haleakala[129]		 2021 JV 0.00094 AU (141,000 km; 87,000 mi) 0.36 8.6–19 27.4 —
2021-05-06[130] 2021-05-05
G96 Mt. Lemmon Survey[131]		 2021 JS1 0.00074 AU (111,000 km; 69,000 mi) 0.29 5.3–12 28.5 —
2021-05-07 2021-05-09 P11gae7 0.00126 AU (188,000 km; 117,000 mi) 0.49[note 26] 3.1–19 28.5 —[132]
2021-05-08[133] 2021-05-07
G96 Mt. Lemmon Survey[134]		 2021 JQ2 0.00045 AU (67,000 km; 42,000 mi) 0.17 2.6–5.9 30.0 —
2021-05-08 2021-05-09 P11gae5 0.00057 AU (85,000 km; 53,000 mi) 0.22[note 27] 1.3–8.2 30.3 —[135]
2021-05-09 2021-05-12 P11ggM3 0.00235 AU (352,000 km; 218,000 mi) 0.91[note 28] 1.2–7.5 30.5 —[136]
2021-05-13[137] 2021-05-08
F51 Pan-STARRS 1, Haleakala[138]		 2021 JB6 0.00071 AU (106,000 km; 66,000 mi) 0.27 4.7–10 28.8 —
2021-05-14[139] 2021-05-14
I41 Palomar Mountain—ZTF[140]		 2021 JU6 0.00044 AU (66,000 km; 41,000 mi) 0.17 10–23 27.1 —
2021-05-27[141] 2021-06-01
F51 Pan-STARRS 1, Haleakala[142]		 2021 LV 0.00188 AU (281,000 km; 175,000 mi) 0.73 6.9–15 27.9 ✓
2021-05-30[143] 2021-05-30
381 Tokyo-Kiso[144]		 2021 KO2 0.00248 AU (371,000 km; 231,000 mi) 0.96 6.6–15 28.0 —
2021-05-30 2021-05-30 TMG0049 0.000726 AU (108,600 km; 67,500 mi) 0.28[note 29] 2.2–7.1 29.9 —[145]
2021-05-31[146] 2021-05-30
381 Tokyo-Kiso[147]		 2021 KN2 0.00097 AU (145,000 km; 90,000 mi) 0.38 5.0–11 28.6 —
2021-05-31[148] 2021-05-31
381 Tokyo-Kiso[149]		 2021 KQ2 0.00119 AU (178,000 km; 111,000 mi) 0.46 2.7–6.1 30.0 —
2021-05-31 2021-05-31 C5Q2Z32 0.0000774 AU (11,580 km; 7,190 mi) 0.030[note 30] 0.67–4.1 31.8 —[150]
2021-06-01[151] 2021-05-31
G96 Mt. Lemmon Survey[152]		 2021 KT2 0.00195 AU (292,000 km; 181,000 mi) 0.76 5.6–12 28.4 —
2021-06-04[153] 2021-06-05
T05 ATLAS-HKO, Haleakala[154]		 2021 LX1 0.00107 AU (160,000 km; 99,000 mi) 0.42 10–23 27.1 —
2021-06-12[155] 2021-06-11
F51 Pan-STARRS 1, Haleakala[156]		 2021 LG5 0.00106 AU (159,000 km; 99,000 mi) 0.41 4.8–11 28.7 —
2021-06-13[157] 2021-06-08
G96 Mt. Lemmon Survey[158]		 2021 LO2 0.00148 AU (221,000 km; 138,000 mi) 0.58 6.6–15 28.0 —
2021-06-15[159] 2021-06-18
W94 MAP, San Pedro de Atacama[160]		 2021 MU 0.00111 AU (166,000 km; 103,000 mi) 0.43 8.8–20 27.4 —
2021-06-17[161] 2021-06-17
T05 ATLAS-HKO, Haleakala[162]		 2021 ME 0.00212 AU (317,000 km; 197,000 mi) 0.82 4.3–9.6 29.0 —
2021-07-03[163] 2021-07-01
F51 Pan-STARRS 1, Haleakala[164]		 2021 NA 0.00044 AU (66,000 km; 41,000 mi) 0.17 5.2–12 28.6 —
2021-07-08[165] 2021-07-09
F51 Pan-STARRS 1, Haleakala[166]		 2021 NU3 0.00120 AU (180,000 km; 112,000 mi) 0.47 5.0–11 28.6 —
2021-07-20[167] 2021-07-19
W94 MAP, San Pedro de Atacama[168]		 2021 OV 0.00131 AU (196,000 km; 122,000 mi) 0.51 7.5–17 27.8 ✓
2021-07-31[169] 2021-07-30
T08 ATLAS-MLO, Mauna Loa[170]		 2021 OD1 0.00170 AU (254,000 km; 158,000 mi) 0.66 5.9–13 28.3 —
2021-08-02[171] 2021-08-02
I41 Palomar Mountain—ZTF[172]		 2021 PC 0.00110 AU (165,000 km; 102,000 mi) 0.43 12–27 26.7 —
2021-08-02[173] 2021-08-02
T08 ATLAS-MLO[174]		 2021 PL132 0.00233 AU (349,000 km; 217,000 mi) 0.91 5.2–12 28.5 —
2021-08-05[175] 2021-08-07
F51 Pan-STARRS 1, Haleakala[176]		 2021 PY4 0.00188 AU (281,000 km; 175,000 mi) 0.73 13–29 26.5 —
2021-08-06[177] 2021-08-08
W94 MAP, San Pedro de Atacama[178]		 2021 PK4 0.00160 AU (239,000 km; 149,000 mi) 0.62 6.1–14 28.2 —
2021-08-14[179] 2021-08-15
T05 ATLAS-HKO, Haleakala[180]		 2021 PA17 0.00045 AU (67,000 km; 42,000 mi) 0.17 7.3–16 27.8 —
2021-08-27[181] 2021-08-27
T05 ATLAS-HKO, Haleakala[182]		 2021 QD1 0.00204 AU (305,000 km; 190,000 mi) 0.80 4.8–11 28.7 —
2021-08-28[183] 2021-08-30
F51 Pan-STARRS 1, Haleakala[184]		 2021 QV3 0.00085 AU (127,000 km; 79,000 mi) 0.33 2.4–5.3 30.2 —
2021-09-02[185] 2021-09-03
I41 Palomar Mountain—ZTF[186]		 2021 RN5 0.00253 AU (378,000 km; 235,000 mi) 0.98 8.1–18 27.6 ✓
2021-09-06[187] 2021-09-08
F51 Pan-STARRS 1, Haleakala[188]		 2021 RT4 0.00177 AU (265,000 km; 165,000 mi) 0.69 6.2–14 28.2 —
2021-09-07[189] 2021-09-08
F51 Pan-STARRS 1, Haleakala[190]		 2021 RS100 0.00128 AU (191,000 km; 119,000 mi) 0.50 4.7–11 28.8 ✓
2021-09-08[191] 2021-09-07
G96 Mt. Lemmon Survey[192]		 2021 RS2 0.00015 AU (22,000 km; 14,000 mi) 0.06 2.3–5.1 30.4 —
2021-09-08[193] 2021-09-07
703 Catalina Sky Survey[194]		 2021 RP2 0.00080 AU (120,000 km; 74,000 mi) 0.31 2.3–5.2 30.3 ✓
2021-09-08[195] 2021-09-09
K88 GINOP-KHK, Piszkesteto[196]		 2021 RS5 0.00092 AU (138,000 km; 86,000 mi) 0.36 5.7–13 28.3 —
2021-09-09[197] 2021-09-05
T05 ATLAS-HKO, Haleakala[198]		 2021 RQ2 0.00126 AU (188,000 km; 117,000 mi) 0.49 3.3–7.3 29.5 —
2021-09-09[199] 2021-09-10
703 Catalina Sky Survey[200]		 2021 RB6 0.00172 AU (257,000 km; 160,000 mi) 0.67 6.6–15 28.0 —
2021-09-11[201] 2021-09-10
T05 ATLAS-HKO, Haleakala[202]		 2021 RG6 0.00057 AU (85,000 km; 53,000 mi) 0.22 4.4–9.8 28.9 —
2021-09-11[203] 2021-09-12
T08 ATLAS-MLO, Mauna Loa[204]		 2021 RG12 0.00217 AU (325,000 km; 202,000 mi) 0.84 3.9–8.7 29.2 —
2021-09-12[205] 2021-09-08
G96 Mt. Lemmon Survey[206]		 2021 RR5 0.00053 AU (79,000 km; 49,000 mi) 0.20 5.6–12 28.4 —
2021-09-16[207] 2021-09-13
F51 Pan-STARRS 1, Haleakala[208]		 2021 RF16 0.00213 AU (319,000 km; 198,000 mi) 0.83 4.3–9.6 29.0 —
2021-09-16[209] 2021-09-17
I41 Palomar Mountain—ZTF[210]		 2021 SG 0.00164 AU (245,000 km; 152,000 mi) 0.64 42–94 24.0 —
2021-09-17[211] 2021-09-17
I41 Palomar Mountain—ZTF[212]		 2021 SP 9.43×10−5 AU (1.411×104 km; 8.77×103 mi) 0.04 3.7–8.3 29.3 —
2021-09-20[213] 2021-09-23
F51 Pan-STARRS 1, Haleakala[214]		 2021 SQ 0.00184 AU (275,000 km; 171,000 mi) 0.72 5.5–12 28.4 ✓
2021-09-26[215] 2021-09-28
F52 Pan-STARRS 2, Haleakala[216]		 2021 SW1 0.00182 AU (272,000 km; 169,000 mi) 0.71 2.9–6.5 29.8 —
2021-09-27[217] 2021-09-28
T05 ATLAS-HKO, Haleakala[218]		 2021 SQ1 0.00111 AU (166,000 km; 103,000 mi) 0.43 4.6–10 28.8 —
2021-09-30[219] 2021-10-02
G96 Mt. Lemmon Survey[220]		 2021 TT 0.00089 AU (133,000 km; 83,000 mi) 0.34 7.2–16 27.8 —
2021-10-01[221] 2021-10-02
F52 Pan-STARRS 2, Haleakala[222]		 2021 TX 0.00028 AU (42,000 km; 26,000 mi) 0.11 1.5–3.5 31.2 —
2021-10-03[223] 2021-10-03
T08 ATLAS-MLO, Mauna Loa[224]		 2021 TV1 0.00108 AU (162,000 km; 100,000 mi) 0.42 6.5–14 28.1 —
2021-10-03[225] 2021-10-03
G96 Mt. Lemmon Survey[226]		 2021 TG1 0.00196 AU (293,000 km; 182,000 mi) 0.76 6.1–14 28.2 —
2021-10-06[227] 2021-10-06
381 Tokyo-Kiso[228]		 2021 TQ4 0.00255 AU (381,000 km; 237,000 mi) 0.99 2.8–6.2 29.9 —
2021-10-10[229] 2021-10-03
F52 Pan-STARRS 2, Haleakala[230]		 2021 TT1 0.00251 AU (375,000 km; 233,000 mi) 0.97 15–34 26.2 ✓
2021-10-11[231] 2021-10-11
T05 ATLAS-HKO, Haleakala[232]		 2021 TK11 0.00091 AU (136,000 km; 85,000 mi) 0.35 4.9–11 28.7 —
2021-10-11[233] 2021-10-11
T05 ATLAS-HKO, Haleakala[234]		 2021 TT13 0.00036 AU (54,000 km; 33,000 mi) 0.14 2.9–6.5 29.8 —
2021-10-11[235] 2021-10-13
F51 Pan-STARRS 1, Haleakala[236]		 2021 TH15 0.00211 AU (316,000 km; 196,000 mi) 0.82 4.5–10 28.8 ✓
2021-10-12[237] 2021-10-13
G96 Mt. Lemmon Survey[238]		 2021 TE13 0.00018 AU (27,000 km; 17,000 mi) 0.07 3.7–8.2 29.3 —
2021-10-14[239] 2021-10-14
T05 ATLAS-HKO, Haleakala[240]		 2021 TM14 0.00098 AU (147,000 km; 91,000 mi) 0.38 6.7–15 28.0 —
2021-10-16[241] 2021-10-16
703 Catalina Sky Survey[242]		 2021 UL 0.00024 AU (36,000 km; 22,000 mi) 0.09 2.3–5.2 30.3 ✓
2021-10-16[243] 2021-10-14
G96 Mt. Lemmon Survey[244]		 2021 TJ15 0.00257 AU (384,000 km; 239,000 mi) 1.00 5.6–13 28.4 —
2021-10-18[245] 2021-10-11
F51 Pan-STARRS 1, Haleakala[246]		 2021 TG14 0.00167 AU (250,000 km; 155,000 mi) 0.65 6.0–14 28.2 —
2021-10-24[247] 2021-10-24
K88 GINOP-KHK, Piszkesteto[248]		 2021 UT 0.00100 AU (150,000 km; 93,000 mi) 0.39 3.6–8.1 29.3 —
2021-10-25[249] 2021-10-26
G96 Mt. Lemmon Survey[250]		 2021 UO1 0.00102 AU (153,000 km; 95,000 mi) 0.40 6.7–15 28.0 —
2021-10-25[251] 2021-10-25
703 Catalina Sky Survey[252]		 2021 UA1 6.30×10−5 AU (9.42×103 km; 5.86×103 mi) 0.02 1.2–2.6 31.8 —
2021-10-27[2] 2021-10-28
G96 Mt. Lemmon Survey[253]		 2021 UA7 0.00086 AU (129,000 km; 80,000 mi) 0.33 4.7–11 28.8 —
2021-10-27[254] 2021-10-26
G96 Mt. Lemmon Survey[255]		 2021 UH1 0.00048 AU (72,000 km; 45,000 mi) 0.19 1.3–2.8 31.6 —
2021-10-29[256] 2021-10-30
W94 MAP, San Pedro de Atacama[257]		 2021 UV5 0.00077 AU (115,000 km; 72,000 mi) 0.30 4.6–10 28.8 —
2021-10-29[258] 2021-10-31
K88 GINOP-KHK, Piszkesteto[259]		 2021 UT5 0.00205 AU (307,000 km; 191,000 mi) 0.80 5.8–13 28.3 —
2021-10-29[260] 2021-10-29
381 Tokyo-Kiso[261]		 2021 UF12 0.00161 AU (241,000 km; 150,000 mi) 0.63 3.7–8.2 29.3 —
2021-10-30[262] 2021-10-27
G96 Mt. Lemmon Survey[263]		 2021 UW1 0.00256 AU (383,000 km; 238,000 mi) 0.99 16–35 26.1 —
2021-10-30[264] 2021-10-31
T08 ATLAS-MLO, Mauna Loa[265]		 2021 UJ6 0.00232 AU (347,000 km; 216,000 mi) 0.90 6.0–13 28.3 —
2021-11-01[266] 2021-11-02
T08 ATLAS-MLO, Mauna Loa[267]		 2021 VH 0.00020 AU (30,000 km; 19,000 mi) 0.08 3.2–7.1 29.6 —
2021-11-04[268] 2021-10-31
F51 Pan-STARRS 1, Haleakala[269]		 2021 UO7 0.00247 AU (370,000 km; 230,000 mi) 0.96 3.3–7.3 29.6 —
2021-11-07[270] 2021-11-11
G96 Mt. Lemmon Survey[271]		 2021 VS11 0.00204 AU (305,000 km; 190,000 mi) 0.79 2.2–4.8 28.7 —
2021-11-07[272] 2021-11-06
G96 Mt. Lemmon Survey[273]		 2021 VK3 0.00057 AU (85,000 km; 53,000 mi) 0.22 2.2–4.8 30.5 —
2021-11-08[274] 2021-11-07
T08 ATLAS-MLO, Mauna Loa[275]		 2021 VL3 0.00111 AU (166,000 km; 103,000 mi) 0.43 5.5–12 28.4 —
2021-11-08[276] 2021-11-07
G96 Mt. Lemmon Survey[277]		 2021 VN3 0.00092 AU (138,000 km; 86,000 mi) 0.36 2.0–4.6 30.6 —
2021-11-08[278] 2021-11-07
G96 Mt. Lemmon Survey[279]		 2021 VM3 0.00204 AU (305,000 km; 190,000 mi) 0.79 2.9–6.5 29.8 —
2021-11-09[280] 2021-11-10
G96 Mt. Lemmon Survey[281]		 2021 VD8 0.00083 AU (124,000 km; 77,000 mi) 0.32 2.4–5.4 30.2 —
2021-11-09[282] 2021-11-09
G96 Mt. Lemmon Survey[283]		 2021 VP11 0.00039 AU (58,000 km; 36,000 mi) 0.15 1.2–2.6 31.8 —
2021-11-10[284] 2021-11-08
F52 Pan-STARRS 2, Haleakala[285]		 2021 VU4 0.00072 AU (108,000 km; 67,000 mi) 0.28 5.6–13 28.4 —
2021-11-11[286] 2021-11-10
G96 Mt. Lemmon Survey[287]		 2021 VY7 0.00214 AU (320,000 km; 199,000 mi) 0.83 3.7–8.3 29.3 —
2021-11-12[288] 2021-11-10
G96 Mt. Lemmon Survey[289]		 2021 VC7 0.00124 AU (186,000 km; 115,000 mi) 0.48 6.1–14 28.2 —
2021-11-21[290] 2021-11-24
T08 ATLAS-MLO, Mauna Loa[291]		 2021 WP 0.00104 AU (156,000 km; 97,000 mi) 0.41 6.7–15 28.0 —
2021-11-26[292] 2021-11-27
703 Catalina Sky Survey[293]		 2021 WA1 0.00206 AU (308,000 km; 191,000 mi) 0.80 8.2–18 27.5 ✓
2021-11-28[294] 2021-11-27
G96 Mt. Lemmon Survey[295]		 2021 WC1 0.00136 AU (203,000 km; 126,000 mi) 0.53 5.4–12 28.5 —
2021-11-30[296] 2021-12-02
G96 Mt. Lemmon Survey[297]		 2021 XV 0.00136 AU (203,000 km; 126,000 mi) 0.39 2.6–5.8 30.1 —
2021-12-01[298] 2021-11-29
G96 Mt. Lemmon Survey[299]		 2021 WF3 0.00096 AU (144,000 km; 89,000 mi) 0.37 3.5–7.9 29.4 —
2021-12-01[300] 2021-12-02
I41 Palomar Mountain—ZTF[301]		 2021 XL 0.00135 AU (202,000 km; 125,000 mi) 0.53 4.5–10 28.9 —
2021-12-04[302] 2021-12-02
G96 Mt. Lemmon Survey[303]		 2021 XF1 0.00206 AU (308,000 km; 191,000 mi) 0.80 3.3–7.4 29.5 —
2021-12-05[304] 2021-12-03
G96 Mt. Lemmon Survey[305]		 2021 XC2 0.00212 AU (317,000 km; 197,000 mi) 0.82 3.0–6.7 29.8 —
2021-12-09[306] 2021-12-12
G96 Mt. Lemmon Survey[307]		 2021 XZ5 0.00214 AU (320,000 km; 199,000 mi) 0.83 5.8–13 28.3 ✓
2021-12-09[308] 2021-12-08
G96 Mt. Lemmon Survey[309]		 2021 XU5 0.00160 AU (239,000 km; 149,000 mi) 0.62 3.6–8.0 29.4 ✓
2021-12-10[310] 2021-12-08
G96 Mt. Lemmon Survey[311]		 2021 XV4 0.00120 AU (180,000 km; 112,000 mi) 0.47 5.2–12 28.6 —
2021-12-11[312] 2021-12-08
G96 Mt. Lemmon Survey[313]		 2021 XX4 0.00251 AU (375,000 km; 233,000 mi) 0.98 5.2–12 28.5 —
2021-12-16[314] 2021-12-12
G96 Mt. Lemmon Survey[315]		 2021 XC6 0.00140 AU (209,000 km; 130,000 mi) 0.54 6.0–13 28.2 ✓

Warning times by size

[edit]

This sub-section visualises the warning times of the close approaches listed in the above table, depending on the size of the asteroid. It shows the effectiveness of asteroid warning systems at detecting close approaches in 2021. 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.[1]

Absolute magnitude 30 and greater

Silhouette of man standing and facing forward
Silhouette of man standing and facing forward

(size of a person for comparison)

After closest approach: 17 (50.0%)< 24 hours before: 6 (17.6%)up to 7 days before: 11 (32.4%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Absolute magnitude 29-30

After closest approach: 15 (38.5%)< 24 hours before: 8 (20.5%)up to 7 days before: 16 (41.0%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Absolute magnitude 28-29

After closest approach: 31 (44.9%)< 24 hours before: 17 (24.6%)up to 7 days before: 21 (30.4%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Absolute magnitude 27-28

After closest approach: 10 (71.4%)< 24 hours before: 1 (7.1%)up to 7 days before: 3 (21.4%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Absolute magnitude 26-27 (probable size of the Chelyabinsk meteor)

After closest approach: 3 (27.3%)< 24 hours before: 1 (9.1%)up to 7 days before: 6 (54.5%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 1 (9.1%)

Absolute magnitude 25-26

After closest approach: 0 (0.0%)< 24 hours before: 0 (0.0%)up to 7 days before: 1 (100.0%)> one week before: 0 (0.0%)> 7 weeks before: 0 (0.0%)> one year before: 0 (0.0%)

Absolute magnitude less than 25 (largest)

After closest approach: 1 (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: 1 (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%)

Predicted close approaches

[edit]

Below is the list of predicted close approaches of near-Earth asteroids larger than magnitude 27, that were predicted to occur in 2021.[note 1] This relates to the effectiveness of asteroid cataloging systems at predicting close approaches in 2021. 2018 BA3 (with a 9 day observation arc from January 2018) could have passed as far as 3 million km (8 LD) from Earth.[21]

For asteroids which were observed but not predicted in advance, see the main list above.

  Rows highlighted orange indicate objects which were predicted theoretically but were not observed in practice

  Rows highlighted yellow indicate objects which were predicted and observed but the predicted close approach date and distance were incorrect

  Rows highlighted green indicate objects which were observed with the predicted close approach distance (within +/-50%) but wrong date

  Rows highlighted turquoise indicate objects which were observed with the predicted close approach date but wrong distance (out by over 50%)

  Rows highlighted blue indicate objects which were observed as predicted with the correct close approach date and distance

Object Predicted Date of closest approach Actual Date of closest approach Predicted closest approach range (Lunar
distance) 		Actual closest approach distance (Lunar
distance) 		(H)
(abs. mag) 		Approx. Size (m)
2018 BA3 2021-01-26 ±7 days [21] Not observed in 2021[22] 0.74–8.2 (0.97 nominal) Not observed in 2021 26.4 14–31

Notes

[edit]
  1. ^ a b Absolute magnitude 27 is the estimated magnitude of the Chelyabinsk meteor, which caused widespread damage and injury, but no deaths. Objects smaller than this are excluded.
  2. ^ 2021 UA7 passed Earth with a velocity with respect to Earth of 27.7 km/s and was moving away from the Sun at 37.0 km/s.
  3. ^ Discovery date, and if the object was confirmed and previously undiscovered, the discoverer
  4. ^ 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 (0.0166 LD).
  5. ^ Objects that approached closer to the Moon than Earth are marked with a check.
  6. ^ For unconfirmed asteroids, the provided distance range is for the 25th and 75th percentile. As a result, there is a 50% chance the asteroid's approach distance was outside of this range. Additionally, the uncertainty is usually asymmetric, so an asteroid at a nominal distance of 0.4-0.7 LD may have been more likely to only approach to 1.0 LD than to 0.3 LD.
  7. ^ Distance error: 0.0015 AU, approach range: 0.27 to 1.40 LD. There was a roughly 0.6% chance of impact.
  8. ^ Distance error: 0.000097 AU, approach range: 0.21 to 0.28 LD.
  9. ^ Distance error: 0.0005 AU, approach range: 0.28 to 0.66 LD.
  10. ^ Distance error: 0.00011 AU, approach range 0.037 to 0.12 LD. There was a roughly 11.7% chance of impact.
  11. ^ Distance error: 0.000082 AU, approach range: 0.55 to 0.61 LD.
  12. ^ Distance error: 0.0015 AU, approach range: 0.40 to 1.67 LD.
  13. ^ Distance error: 0.00004 AU, approach range: 0.082 to 0.11 LD.
  14. ^ Distance error: 0.0008 AU, approach range: 0.64 to 1.28 LD.
  15. ^ Distance error: 0.00000182 AU, approach range: 0.854 to 0.856 LD.
  16. ^ Distance error: 0.0000170 AU, approach range: 0.48 to 0.51 LD.
  17. ^ Distance error: >0.001 AU, approach range: 0.18 to 93 LD. Although highly asymmetric, there is still a 56% chance the asteroid passed within 2 LD of Earth, and a 15% chance it passed within 7 Earth radii of the planet.
  18. ^ Distance error: 0.000000822 AU.
  19. ^ Distance error: 0.0009 AU, approach range: 0.13 to 0.86 LD. There was a roughly 2.2% chance of impact.
  20. ^ Distance uncertainty: 0.00070 AU, approach range: 0.58 to 1.07 LD.
  21. ^ Distance error: 0.000166 AU, approach range: 0.35 to 0.48 LD.
  22. ^ Distance error: 0.0009 AU, approach range: 0.14 to 0.89 LD.
  23. ^ Distance error: 0.00078 AU, approach range: 0.077 to 0.70 LD. There was a roughly 5% chance of impact.
  24. ^ Distance error: highly asymmetric, approach range: 0.011 to 30.7 LD. There was a roughly 38% chance of impact.
  25. ^ Distance error: 0.001 AU, approach range: 0.066 to 0.86 LD. There was a roughly 12.1% chance of impact.
  26. ^ Distance error: 0.0004 AU, approach range: 0.37 to 0.68 LD.
  27. ^ Distance error: 0.00022 AU, approach range: 0.16 to 0.38 LD.
  28. ^ Distance error: 0.0010 AU, approach range: 0.61 to 1.51 LD.
  29. ^ Distance error: 0.00000017 AU, approach range: 0.2824 to 0.2825 LD.
  30. ^ Distance error: 0.00002 AU, approach range: 0.024 to 0.041 LD. There was a roughly 5.6% chance of impact.

Additional examples

[edit]
Confirmed Earth approaches in 2021
Passed within #
1 LD (384,400 km) 145
5 LD (1,922,000 km) 586
10 LD (3,844,000 km) 1018
0.05 AU (19 LD) 1584
0.1 AU (39 LD) 2312
0.2 AU (78 LD) 3391
Goldstone radar images of asteroid 99942 Apophis on 8–10 March 2021
Goldstone radar images of asteroid 2001 FO32 during closest approach on 21 March 2021

Below is 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 2021.

Object Size
(meters) 		Nearest approach
(lunar
distances) 		Date Ref
2018 RB 120-260 18.27 2021-02-07 JPL · CAD
(456537) 2007 BG 330-750 22.35 2021-02-26 JPL · CAD
2016 DV1 29-65 2.1 2021-03-03 JPL · CAD
2021 DW1 30 1.48 2021-03-04 JPL · CAD
99942 Apophis 370 43.85 2021-03-06 JPL · CAD
(231937) 2001 FO32 550 5.25 2021-03-21 JPL · CAD
(441987) 2010 NY65 140-310 15.54 2021-06-25 JPL · CAD
2021 LD1 1,200[316] 11.78 2021-07-09 JPL · CAD
(285571) 2000 PQ9 640-1,400 26.16 2021-07-21 JPL · CAD
2008 GO20 97-220 11.78 2021-07-25 JPL · CAD
2018 LM4 460-1,000 31.85 2021-08-06 JPL · CAD
2016 AJ193 1,374 8.92 2021-08-21 JPL · CAD
2019 XS 48-110 1.49 2021-11-09 JPL · CAD
3361 Orpheus 300 15.01 2021-11-21 JPL · CAD
1994 WR12 130 16.00 2021-11-29 JPL · CAD
4660 Nereus 330 10.23 2021-12-11 JPL · CAD
(163899) 2003 SD220 790 14.12 2021-12-17 JPL · CAD
2018 AH[note2 1] 80-170 12.18 2021-12-27 JPL · CAD
Planet Venus[note2 2] — 107.4 2021-12-31 JPL

Notes

[edit]
  1. ^ Short arc object that had not been observed for years and therefore the uncertainty was relatively large.
  2. ^ For comparison as closest Venus approach is 2022-Jan-08 at 103 LD. (Earth will be at perihelion on 2022-Jan-04.)

See also

[edit]

References

[edit]
  1. ^ a b "NEO Earth Close Approaches". Center for Near Earth Object Studies. Jet Propulsion Laboratory. Retrieved 3 March 2021.
  2. ^ a b "JPL Small-Body Database Browser: (2021 UA7)". Jet Propulsion Laboratory. Retrieved 11 November 2021.
  3. ^ "JPL Small-Body Database Browser: (2021 AA)". Jet Propulsion Laboratory. Retrieved 30 October 2021.
  4. ^ "2021 AA". Minor Planet Center. International Astronomical Union. Retrieved 30 October 2021.
  5. ^ "JPL Small-Body Database Browser: (2021 AH)". Jet Propulsion Laboratory. Retrieved 30 October 2021.
  6. ^ "2021 AH". Minor Planet Center. International Astronomical Union. Retrieved 30 October 2021.
  7. ^ "JPL Small-Body Database Browser: (2021 AH8)". Jet Propulsion Laboratory. Retrieved 30 October 2021.
  8. ^ "2021 AH8". Minor Planet Center. International Astronomical Union. Retrieved 30 October 2021.
  9. ^ "JPL Small-Body Database Browser: (2021 AS2)". Jet Propulsion Laboratory. Retrieved 30 October 2021.
  10. ^ "2021 AS2". Minor Planet Center. International Astronomical Union. Retrieved 30 October 2021.
  11. ^ "JPL Small-Body Database Browser: (2021 BR2)". Jet Propulsion Laboratory. Retrieved 30 October 2021.
  12. ^ "2021 BR2". Minor Planet Center. International Astronomical Union. Retrieved 30 October 2021.
  13. ^ "JPL Small-Body Database Browser: (2021 BK)". Jet Propulsion Laboratory. Retrieved 30 October 2021.
  14. ^ "2021 BK". Minor Planet Center. International Astronomical Union. Retrieved 30 October 2021.
  15. ^ "JPL Small-Body Database Browser: (2021 BV1)". Jet Propulsion Laboratory. Retrieved 30 October 2021.
  16. ^ "2021 BV1". Minor Planet Center. International Astronomical Union. Retrieved 30 October 2021.
  17. ^ "JPL Small-Body Database Browser: (2021 BO)". Jet Propulsion Laboratory. Retrieved 30 October 2021.
  18. ^ "2021 BO". Minor Planet Center. International Astronomical Union. Retrieved 30 October 2021.
  19. ^ "JPL Small-Body Database Browser: (2021 BO1)". Jet Propulsion Laboratory. Retrieved 30 October 2021.
  20. ^ "2021 BO1". Minor Planet Center. International Astronomical Union. Retrieved 30 October 2021.
  21. ^ a b c "JPL Small-Body Database Browser: (2018 BA3)". Jet Propulsion Laboratory. Retrieved 30 October 2021.
  22. ^ a b "2018 BA3". Minor Planet Center. International Astronomical Union. Retrieved 30 October 2021.
  23. ^ "JPL Small-Body Database Browser: (2021 CV)". Jet Propulsion Laboratory. Retrieved 30 October 2021.
  24. ^ "2021 CV". Minor Planet Center. International Astronomical Union. Retrieved 30 October 2021.
  25. ^ "JPL Small-Body Database Browser: (2021 CZ3)". Jet Propulsion Laboratory. Retrieved 30 October 2021.
  26. ^ "2021 CZ3". Minor Planet Center. International Astronomical Union. Retrieved 30 October 2021.
  27. ^ "JPL Small-Body Database Browser: (2021 CO)". Jet Propulsion Laboratory. Retrieved 30 October 2021.
  28. ^ "2021 CO". Minor Planet Center. International Astronomical Union. Retrieved 30 October 2021.
  29. ^ "JPL Small-Body Database Browser: (2021 CQ5)". Jet Propulsion Laboratory. Retrieved 30 October 2021.
  30. ^ "2021 CQ5". Minor Planet Center. International Astronomical Union. Retrieved 30 October 2021.
  31. ^ "JPL Small-Body Database Browser: (2021 CC6)". Jet Propulsion Laboratory. Retrieved 30 October 2021.
  32. ^ "2021 CC6". Minor Planet Center. International Astronomical Union. Retrieved 30 October 2021.
  33. ^ "JPL Small-Body Database Browser: (2021 CC7)". Jet Propulsion Laboratory. Retrieved 30 October 2021.
  34. ^ "2021 CC7". Minor Planet Center. International Astronomical Union. Retrieved 30 October 2021.
  35. ^ "JPL Small-Body Database Browser: (2021 CA6)". Jet Propulsion Laboratory. Retrieved 30 October 2021.
  36. ^ "2021 CA6". Minor Planet Center. International Astronomical Union. Retrieved 30 October 2021.
  37. ^ "JPL Small-Body Database Browser: (2021 CS6)". Jet Propulsion Laboratory. Retrieved 30 October 2021.
  38. ^ "2021 CS6". Minor Planet Center. International Astronomical Union. Retrieved 30 October 2021.
  39. ^ "JPL Small-Body Database Browser: (2021 CW7)". Jet Propulsion Laboratory. Retrieved 30 October 2021.
  40. ^ "2021 CW7". Minor Planet Center. International Astronomical Union. Retrieved 30 October 2021.
  41. ^ "JPL Small-Body Database Browser: (2021 DN1)". Jet Propulsion Laboratory. Retrieved 30 October 2021.
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