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
2021-03-20 06:13:03 C 12 54 03.25 -09 49 12.2 V I52
2021-03-20 06:14:11 C 12 54 03.34 -09 49 40.3 V I52
2021-03-20 06:15:19 C 12 54 03.45 -09 50 08.4 V I52
2021-03-20 06:16:27 C 12 54 03.54 -09 50 36.5 V I52
2021-03-20 13:46:32 C 12 55 02.43 -12 39 53.8 V 474
2021-03-20 13:48:00 C 12 55 02.53 -12 40 26.3 V 474
2021-03-20 13:49:27 C 12 55 02.63 -12 40 58.8 V 474
2021-03-22 10:41:36 C 13 00 30.33 -25 22 42.2 V T08
2021-03-22 10:44:15 C 13 00 30.39 -25 23 15.5 V T08
2021-03-22 10:48:14 C 13 00 30.47 -25 24 05.4 V T08
2021-03-22 10:56:11 C 13 00 30.61 -25 25 44.9 V T08
2021-03-22 12:32:14 C 13 00 41.56 -25 41 05.6 V 474
2021-03-22 12:35:07 C 13 00 41.66 -25 41 41.4 V 474
2021-03-22 12:38:01 C 13 00 41.78 -25 42 16.8 V 474
2021-03-23 08:02:15 C 13 02 10.39 -29 14 55.1 u 807
2021-03-23 08:05:40 C 13 02 10.49 -29 15 27.6 u 807
2021-03-23 08:09:03 C 13 02 10.58 -29 15 59.5 u 807
2021-03-25 05:45:26 C 13 05 20.12 -35 07 30.5 u 807
2021-03-25 05:48:56 C 13 05 20.11 -35 07 51.8 u 807
2021-03-25 05:52:20 C 13 05 20.11 -35 08 12.1 u 807
2021-03-25 12:45:01 C 13 05 45.07 -35 47 45.5 V R57
2021-03-25 12:47:48 C 13 05 45.09 -35 48 01.7 V R57
2021-03-25 12:50:34 C 13 05 45.00 -35 48 17.1 V R57