2021 ET4

NEO MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.5129916215 ± 4.96e-05
Semi-major axis (a)2.0228270629 AU ± 2.13e-04
Inclination (i)10.99292763° ± 7.64e-04
Long. of Asc. Node (Ω)359.46675530° ± 1.34e-05
Arg. of Perihelion (ω)153.40831349° ± 6.41e-05
Mean Anomaly (M)232.12550303° ± 9.35e-02
Mean Motion (n)0.3425895750°/day ± 5.40e-05
Perihelion dist (q)0.98513373 AU ± 1.44e-04
Aphelion dist (Q)3.06052040 AU ± 3.37e-04
Orbital Period2.87698855 yr ± 4.53e-04
Physical Parameters
H (abs. magnitude)24.16
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-06-02
RMS Residual0.273″
Uncertainty2
Orbit TypeApollo
MOID0.021199 AU
Observations Used221
Oppositions1
Arc Total2021-2021
First Observation Used2021-03-15
Last Observation Used2021-03-25
Observations (223)
Date Type RA Dec Mag Band Observatory
2021-03-15 11:57:15 C 12 04 58.83 +63 17 41.4 V T05
2021-03-15 12:02:33 C 12 05 03.23 +63 14 47.0 V T05
2021-03-15 12:19:43 C 12 05 17.55 +63 05 17.1 V T05
2021-03-15 13:01:01 C 12 05 52.10 +62 42 11.7 V T05
2021-03-15 19:07:07 C 12 12 55.43 +59 07 23.6 V K38
2021-03-15 19:12:36 C 12 12 55.93 +59 04 51.4 o K88
2021-03-15 19:13:37 C 12 13 00.95 +59 03 39.6 V K38
2021-03-15 19:14:02 C 12 12 57.07 +59 04 00.7 o K88
2021-03-15 19:15:29 C 12 12 58.22 +59 03 11.1 o K88
2021-03-15 19:20:05 C 12 13 06.33 +58 59 54.8 V K38
2021-03-15 19:23:40 C 12 13 04.86 +58 58 26.4 o K88
2021-03-15 19:25:07 C 12 13 05.99 +58 57 35.8 o K88
2021-03-15 19:26:33 C 12 13 07.14 +58 56 45.6 o K88
2021-03-15 19:32:31 C 12 13 14.63 +58 51 37.9 V J95
2021-03-15 19:33:16 C 12 13 15.28 +58 51 12.3 V J95
2021-03-15 19:33:59 C 12 13 15.93 +58 50 47.0 V J95
2021-03-15 19:34:42 C 12 13 16.52 +58 50 21.8 V J95
2021-03-15 19:36:54 C 12 13 21.02 +58 50 29.8 V L39
2021-03-15 19:39:31 C 12 13 23.01 +58 48 58.6 V L39
2021-03-15 19:41:16 C 12 13 24.41 +58 47 58.0 V L39
2021-03-15 19:47:02 C 12 13 26.35 +58 43 16.1 V 970
2021-03-15 19:47:27 C 12 13 30.17 +58 44 04.8 q C77
2021-03-15 19:50:25 C 12 13 32.55 +58 42 21.7 q C77
2021-03-15 19:52:58 C 12 13 34.63 +58 40 52.1 q C77
2021-03-15 19:53:36 C 12 13 31.93 +58 39 28.3 V 970
2021-03-15 19:55:14 C 12 13 36.45 +58 39 33.0 q C77
2021-03-15 19:56:27 C 12 13 36.56 +58 39 04.9 V K63
2021-03-15 19:57:42 C 12 13 38.38 +58 38 07.2 q C77
2021-03-15 19:59:14 C 12 13 36.56 +58 36 11.7 V 970
2021-03-15 20:01:45 C 12 13 40.75 +58 35 59.8 V K63
2021-03-15 20:02:04 C 12 13 38.85 +58 34 32.3 V 970
2021-03-15 20:04:59 C 12 13 43.31 +58 34 06.3 V K63
2021-03-15 20:11:46 C 12 13 46.29 +58 30 10.0 V 595
2021-03-15 20:14:29 C 12 13 48.39 +58 28 35.2 V 595
2021-03-15 20:17:11 C 12 13 50.47 +58 26 59.8 V 595
2021-03-15 20:25:59 C 12 13 59.44 +58 21 52.4 V 160
2021-03-15 20:27:55 C 12 14 00.93 +58 20 44.1 V 160
2021-03-15 20:29:48 C 12 14 02.38 +58 19 37.1 V 160
2021-03-15 20:31:41 C 12 14 03.78 +58 18 31.4 V 160
2021-03-15 20:39:50 C 12 14 07.81 +58 13 44.3 V L01
2021-03-15 20:43:16 C 12 14 10.35 +58 11 42.1 V L01
2021-03-15 20:45:00 C 12 14 11.64 +58 10 41.1 V L01
2021-03-15 20:46:43 C 12 14 12.90 +58 09 40.2 V L01
2021-03-15 20:48:26 C 12 14 14.16 +58 08 39.3 V L01
2021-03-15 20:50:20 C 12 14 15.56 +58 07 31.5 V L01
2021-03-15 20:51:26 C 12 14 16.37 +58 06 52.7 V L01
2021-03-15 21:02:01 C 12 14 26.82 +57 59 12.8 V Z80
2021-03-15 21:07:01 C 12 14 30.70 +57 56 14.3 V Z80
2021-03-15 21:12:01 C 12 14 34.51 +57 53 16.2 V Z80
2021-03-15 21:42:23 C 12 15 00.99 +57 36 19.8 V B49