IAA RAS IAA Minor Planet Database

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
2021-03-16 19:37:08 C 12 29 50.73 +42 44 07.9 – V B49
2021-03-16 19:39:48 C 12 29 52.07 +42 42 14.1 – V B49
2021-03-16 19:50:12 C 12 29 56.55 +42 34 22.3 – V 958
2021-03-16 19:55:22 C 12 29 59.08 +42 30 40.8 – V 958
2021-03-16 20:00:36 C 12 30 01.65 +42 26 55.4 – V 958
2021-03-16 20:06:52 C 12 30 00.14 +42 21 46.9 – V 970
2021-03-16 20:08:51 C 12 30 01.10 +42 20 22.3 – V 970
2021-03-16 20:10:52 C 12 30 02.09 +42 18 54.0 – V 970
2021-03-16 20:11:40 C 12 30 00.57 +42 18 59.8 – V 033
2021-03-16 20:12:09 C 12 30 00.80 +42 18 38.7 – V 033
2021-03-16 20:12:40 C 12 30 01.02 +42 18 17.7 – V 033
2021-03-16 20:12:47 C 12 30 02.07 +42 17 19.7 – V Z99
2021-03-16 20:14:54 C 12 30 03.13 +42 15 48.3 – V Z99
2021-03-16 20:17:02 C 12 30 04.14 +42 14 16.6 – V Z99
2021-03-16 20:19:09 C 12 30 05.15 +42 12 45.0 – V Z99
2021-03-16 20:35:05 C 12 29 38.94 +42 03 19.1 – V N82
2021-03-16 20:40:59 C 12 29 41.40 +41 58 56.3 – V N82
2021-03-16 20:46:47 C 12 29 43.81 +41 54 37.7 – V N82
2021-03-16 21:02:02 C 12 30 25.86 +41 43 07.7 – V 130
2021-03-16 21:02:42 C 12 30 26.08 +41 42 39.6 – V 130
2021-03-16 21:03:21 C 12 30 26.35 +41 42 10.1 – V 130
2021-03-16 21:04:01 C 12 30 26.71 +41 41 42.1 – V 130
2021-03-16 21:06:19 C 12 30 28.36 +41 38 51.5 – V Z80
2021-03-16 21:11:19 C 12 30 30.62 +41 35 13.8 – V Z80
2021-03-16 21:14:42 C 12 30 31.66 +41 34 13.6 – – 108
2021-03-16 21:16:18 C 12 30 32.81 +41 31 36.3 – V Z80
2021-03-16 21:17:56 C 12 30 33.00 +41 31 51.6 – – 108
2021-03-16 21:21:10 C 12 30 34.32 +41 29 30.2 – – 108
2021-03-16 21:21:18 C 12 30 35.07 +41 27 59.0 – V Z80
2021-03-16 21:29:51 C 12 30 35.05 +41 22 19.7 – V 033
2021-03-16 21:30:23 C 12 30 35.27 +41 21 56.7 – V 033
2021-03-16 21:30:54 C 12 30 35.49 +41 21 34.2 – V 033
2021-03-16 21:42:18 C 12 30 58.550 +41 14 24.86 – V J04
2021-03-16 21:42:27 C 12 30 58.629 +41 14 18.79 – V J04
2021-03-16 21:42:35 C 12 30 58.675 +41 14 13.05 – V J04
2021-03-17 00:50:03 C 12 31 57.24 +38 55 37.6 – V 213
2021-03-17 01:00:06 C 12 32 00.75 +38 48 05.7 – V 213
2021-03-17 01:10:16 C 12 32 04.26 +38 40 28.5 – V 213
2021-03-17 02:49:54 C 12 32 34.31 +37 23 42.0 – o K88
2021-03-17 02:50:19 C 12 32 34.47 +37 23 22.8 – o K88
2021-03-17 02:50:45 C 12 32 34.65 +37 23 03.3 – o K88
2021-03-17 04:44:12 C 12 34 11.94 +35 56 40.3 – V U55
2021-03-17 04:48:18 C 12 34 13.54 +35 53 38.0 – V U55
2021-03-17 04:52:23 C 12 34 15.17 +35 50 36.1 – V U55
2021-03-17 21:28:20 C 12 40 41.63 +23 20 20.5 – V J95
2021-03-17 21:34:31 C 12 40 43.16 +23 15 49.4 – V Z80
2021-03-17 21:35:23 C 12 40 43.63 +23 15 10.4 – V J95
2021-03-17 21:39:00 C 12 40 44.65 +23 12 31.5 – V J95
2021-03-17 21:41:27 C 12 40 45.35 +23 10 43.2 – V J95
2021-03-17 21:51:29 C 12 40 47.81 +23 03 24.3 – V Z80