2021 AB4

NEO MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.2903654063 ± 4.51e-05
Semi-major axis (a)1.3201388872 AU ± 7.25e-05
Inclination (i)2.99289817° ± 4.43e-04
Long. of Asc. Node (Ω)287.60982470° ± 1.93e-04
Arg. of Perihelion (ω)141.02218422° ± 9.50e-04
Mean Anomaly (M)97.15885068° ± 1.01e-01
Mean Motion (n)0.6498046874°/day ± 5.35e-05
Perihelion dist (q)0.93681622 AU ± 7.87e-05
Aphelion dist (Q)1.70346155 AU ± 1.11e-04
Orbital Period1.51680390 yr ± 1.25e-04
Physical Parameters
H (abs. magnitude)26.84
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-06-02
RMS Residual0.355″
Uncertainty3
Orbit TypeApollo
MOID0.000850 AU
Observations Used94
Oppositions1
Arc Total2021-2021
First Observation Used2021-01-08
Last Observation Used2021-02-01
Observations (98)
Date Type RA Dec Mag Band Observatory
2021-01-10 23:19:26 C 10 01 37.57 +00 16 20.5 V 033
2021-01-10 23:21:03 C 10 01 36.68 +00 16 19.2 V 033
2021-01-10 23:23:02 C 10 01 41.00 +00 16 57.2 V I93
2021-01-10 23:27:41 C 10 01 38.47 +00 16 52.9 V I93
2021-01-11 23:56:13 C 09 51 42.18 +00 00 49.6 o K88
2021-01-12 00:03:55 C 09 51 39.00 +00 00 45.9 o K88
2021-01-12 00:07:47 C 09 51 37.35 +00 00 43.9 o K88
2021-01-12 00:11:38 C 09 51 35.79 +00 00 42.0 o K88
2021-01-12 00:13:07 C 09 51 38.97 +00 00 51.6 V 204
2021-01-12 00:26:29 C 09 51 33.42 +00 00 44.3 V 204
2021-01-12 00:38:11 C 09 51 28.60 +00 00 38.3 V 204
2021-01-12 06:31:09 C 09 49 47.07 -00 00 58.9 V I52
2021-01-12 06:31:46 C 09 49 46.82 -00 00 58.8 V I52
2021-01-12 06:32:58 C 09 49 46.38 -00 00 59.5 V I52
2021-01-12 08:34:21 C 09 48 59.11 -00 01 56.1 V G96
2021-01-12 08:37:29 C 09 48 55.35 -00 01 47.6 o 711
2021-01-12 08:41:28 C 09 48 53.79 -00 01 48.9 o 711
2021-01-12 08:41:45 C 09 48 56.17 -00 01 59.7 V G96
2021-01-12 08:45:35 C 09 48 52.15 -00 01 49.7 o 711
2021-01-12 08:49:10 C 09 48 53.27 -00 02 03.1 V G96
2021-01-12 08:56:35 C 09 48 50.23 -00 02 06.1 V G96
2021-01-12 09:12:48 C 09 48 44.18 -00 02 11.0 o 691
2021-01-12 09:22:05 C 09 48 40.48 -00 02 14.8 o 691
2021-01-13 08:36:01 C 09 42 39.63 -00 10 55.4 o 691
2021-01-13 08:46:30 C 09 42 36.34 -00 10 59.2 o 691
2021-01-14 08:05:23 C 09 37 52.78 -00 16 52.3 V I52
2021-01-14 08:08:42 C 09 37 51.94 -00 16 52.9 V I52
2021-01-14 08:12:01 C 09 37 51.09 -00 16 53.6 V I52
2021-01-14 08:15:20 C 09 37 50.25 -00 16 54.4 V I52
2021-01-15 09:57:32 C 09 33 31.16 -00 20 58.7 V I52
2021-01-15 10:00:51 C 09 33 30.49 -00 20 58.8 V I52
2021-01-15 10:04:11 C 09 33 29.78 -00 20 59.2 V I52
2021-01-16 08:50:26 C 09 30 31.49 -00 23 01.0 V I52
2021-01-16 08:52:15 C 09 30 31.15 -00 23 00.9 V I52
2021-01-16 08:54:04 C 09 30 30.81 -00 23 01.1 V I52
2021-01-16 08:55:53 C 09 30 30.48 -00 23 01.0 V I52
2021-01-16 09:41:21 C 09 30 22.33 -00 23 02.1 o 691
2021-01-16 09:56:45 C 09 30 19.49 -00 23 03.2 o 691
2021-01-16 10:12:10 C 09 30 16.68 -00 23 04.1 o 691
2021-01-17 08:13:06 C 09 27 54.07 -00 23 54.6 V I52
2021-01-17 08:20:21 C 09 27 52.86 -00 23 55.3 V I52
2021-01-18 08:03:45 C 09 25 34.86 -00 23 46.6 o 691
2021-01-18 08:17:26 C 09 25 32.96 -00 23 46.7 o 691
2021-01-18 08:31:05 C 09 25 31.02 -00 23 46.2 o 691
2021-01-25 05:18:54 C 09 15 14.87 -00 02 54.3 V W84
2021-01-25 05:20:32 C 09 15 14.72 -00 02 53.9 V W84
2021-02-01 05:43:28 C 09 09 28.94 +00 34 03.3 V W84
2021-02-01 05:45:08 C 09 09 28.85 +00 34 03.9 V W84