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 21:45:41 C 12 15 03.23 +57 34 21.4 V B49
2021-03-15 21:49:03 C 12 15 05.59 +57 32 20.5 V B49
2021-03-15 21:59:05 C 12 15 07.22 +57 26 11.0 V 203
2021-03-15 22:05:33 C 12 15 11.67 +57 22 16.7 V 203
2021-03-15 22:15:29 C 12 15 18.50 +57 16 15.7 V 203
2021-03-15 23:04:31 C 12 15 51.52 +56 46 15.9 V 204
2021-03-15 23:06:57 C 12 15 53.13 +56 44 45.4 V 204
2021-03-15 23:09:34 C 12 15 54.84 +56 43 09.4 V 204
2021-03-15 23:12:02 C 12 15 56.49 +56 41 37.6 V 204
2021-03-15 23:14:34 C 12 15 58.15 +56 40 04.2 V 204
2021-03-15 23:17:13 C 12 16 21.08 +56 39 32.2 V J04
2021-03-15 23:17:20 C 12 16 21.20 +56 39 27.7 V J04
2021-03-15 23:17:28 C 12 16 21.26 +56 39 22.8 V J04
2021-03-16 01:20:27 C 12 17 22.07 +55 21 31.2 V B37
2021-03-16 01:21:31 C 12 17 22.72 +55 20 50.5 V B37
2021-03-16 01:22:31 C 12 17 23.35 +55 20 11.9 V B37
2021-03-16 01:25:05 C 12 17 24.89 +55 18 33.2 V B37
2021-03-16 01:29:19 C 12 17 27.49 +55 15 50.3 V B37
2021-03-16 01:34:16 C 12 17 30.53 +55 12 40.4 V B37
2021-03-16 01:37:17 C 12 17 32.33 +55 10 43.4 V B37
2021-03-16 01:37:50 C 12 17 32.68 +55 10 22.4 V B37
2021-03-16 01:38:24 C 12 17 33.09 +55 10 00.2 V B37
2021-03-16 04:50:38 C 12 20 37.37 +53 05 07.7 q 858
2021-03-16 04:59:12 C 12 20 42.39 +52 59 37.4 q 858
2021-03-16 05:09:11 C 12 20 48.15 +52 53 11.3 q 858
2021-03-16 05:46:42 C 12 21 12.16 +52 26 25.1 V U55
2021-03-16 05:50:39 C 12 21 14.59 +52 23 51.3 V U55
2021-03-16 05:54:42 C 12 21 16.96 +52 21 13.4 V U55
2021-03-16 18:58:45 C 12 29 25.68 +43 12 04.8 o K88
2021-03-16 18:59:10 C 12 29 25.86 +43 11 47.8 o K88
2021-03-16 18:59:33 C 12 29 26.05 +43 11 31.0 o K88
2021-03-16 18:59:57 C 12 29 26.23 +43 11 14.6 o K88
2021-03-16 19:00:21 C 12 29 26.42 +43 10 57.4 o K88
2021-03-16 19:00:44 C 12 29 26.60 +43 10 40.5 o K88
2021-03-16 19:01:07 C 12 29 26.83 +43 10 23.4 o K88
2021-03-16 19:01:31 C 12 29 26.99 +43 10 06.9 o K88
2021-03-16 19:13:14 C 12 29 33.35 +43 00 59.2 V K74
2021-03-16 19:16:00 C 12 29 34.75 +42 59 00.4 V K74
2021-03-16 19:17:22 C 12 29 35.41 +42 58 01.9 V K74
2021-03-16 19:17:26 C 12 29 35.53 +42 57 09.0 V J95
2021-03-16 19:18:43 C 12 29 36.19 +42 56 13.8 V J95
2021-03-16 19:19:57 C 12 29 36.85 +42 55 21.4 V J95
2021-03-16 19:20:09 C 12 29 36.81 +42 56 02.7 V K74
2021-03-16 19:21:12 C 12 29 37.52 +42 54 27.0 V J95
2021-03-16 19:22:01 C 12 29 37.76 +42 54 41.7 V K74
2021-03-16 19:23:43 C 12 29 38.59 +42 53 29.1 V K74
2021-03-16 19:33:55 C 12 29 49.09 +42 46 25.3 V B49
2021-03-16 19:34:31 C 12 29 49.44 +42 45 59.2 V B49
2021-03-16 19:35:11 C 12 29 49.79 +42 45 31.0 V B49
2021-03-16 19:36:28 C 12 29 50.40 +42 44 36.5 V B49