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
2021-03-17 21:59:48 C 12 40 50.12 +22 57 18.1 V Z80
2021-03-17 22:08:32 C 12 40 52.44 +22 50 55.0 V Z80
2021-03-17 23:49:12 C 12 41 14.95 +21 38 06.0 V 204
2021-03-17 23:50:52 C 12 41 15.33 +21 36 52.9 V 204
2021-03-17 23:52:32 C 12 41 15.69 +21 35 39.9 V 204
2021-03-17 23:54:12 C 12 41 16.08 +21 34 26.7 V 204
2021-03-17 23:55:52 C 12 41 16.45 +21 33 13.7 V 204
2021-03-18 01:38:58 C 12 41 39.15 +20 17 19.3 V 033
2021-03-18 01:39:27 C 12 41 39.26 +20 16 58.3 V 033
2021-03-18 01:39:57 C 12 41 39.38 +20 16 36.2 V 033
2021-03-18 04:09:27 C 12 42 16.44 +18 28 16.3 V 033
2021-03-18 04:09:57 C 12 42 16.63 +18 27 55.2 V 033
2021-03-18 04:10:26 C 12 42 16.70 +18 27 33.5 V 033
2021-03-18 04:11:00 C 12 42 16.84 +18 27 09.7 V 033
2021-03-18 07:31:21 C 12 43 42.05 +16 08 29.9 V G96
2021-03-18 07:38:50 C 12 43 43.36 +16 03 16.6 V G96
2021-03-18 07:46:20 C 12 43 44.66 +15 58 03.1 V G96
2021-03-18 07:53:49 C 12 43 45.98 +15 52 50.7 V G96
2021-03-18 08:41:34 C 12 43 54.15 +15 19 39.3 V 703
2021-03-18 08:49:06 C 12 43 55.48 +15 14 25.0 V 703
2021-03-18 08:56:37 C 12 43 56.72 +15 09 12.2 V 703
2021-03-18 09:04:09 C 12 43 58.02 +15 03 59.0 V 703
2021-03-18 10:28:30 C 12 44 34.45 +14 07 31.0 V T05
2021-03-18 10:33:06 C 12 44 35.16 +14 04 22.5 V T05
2021-03-18 11:07:51 C 12 44 40.41 +13 40 42.7 V T05
2021-03-18 11:16:57 C 12 44 41.78 +13 34 32.3 V T05
2021-03-18 23:41:59 C 12 48 07.62 +05 34 55.1 V G40
2021-03-19 00:09:43 C 12 48 11.45 +05 18 16.0 V G40
2021-03-19 00:40:26 C 12 48 15.52 +04 59 55.4 V G40
2021-03-19 00:41:50 C 12 48 15.67 +04 59 05.9 V G40
2021-03-19 00:43:14 C 12 48 15.86 +04 58 15.6 V G40
2021-03-19 01:10:56 C 12 48 19.30 +04 41 49.1 V G40
2021-03-19 01:12:19 C 12 48 19.50 +04 40 59.1 V G40
2021-03-19 01:13:46 C 12 48 19.66 +04 40 08.0 V G40
2021-03-19 08:51:11 C 12 49 51.84 +00 19 53.0 V 703
2021-03-19 09:06:24 C 12 49 53.50 +00 11 42.5 V 703
2021-03-19 09:14:01 C 12 49 54.34 +00 07 36.0 V 703
2021-03-19 10:34:01 C 12 50 21.55 -00 33 54.4 V T08
2021-03-19 10:39:22 C 12 50 22.08 -00 36 45.3 V T08
2021-03-19 10:56:40 C 12 50 23.68 -00 45 54.5 V T08
2021-03-19 11:21:28 C 12 50 25.93 -00 58 59.7 V T08
2021-03-19 13:00:52 C 12 50 48.99 -01 43 49.4 V 474
2021-03-19 13:02:17 C 12 50 49.15 -01 44 33.5 V 474
2021-03-19 13:03:42 C 12 50 49.31 -01 45 17.6 V 474
2021-03-19 21:58:07 C 12 52 37.85 -06 14 41.6 V G17
2021-03-19 22:00:04 C 12 52 38.10 -06 15 35.6 V G17
2021-03-19 22:02:02 C 12 52 38.28 -06 16 29.7 V G17
2021-03-19 22:55:49 C 12 52 45.93 -06 41 33.9 V Z80
2021-03-19 23:00:49 C 12 52 46.54 -06 43 50.1 V Z80
2021-03-19 23:05:49 C 12 52 47.17 -06 46 06.0 V Z80