380128 (1997 WB21)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.3169446759 ± 1.36e-08
Semi-major axis (a)1.4597153168 AU ± 5.48e-10
Inclination (i)3.39067640° ± 1.59e-06
Long. of Asc. Node (Ω)280.94587240° ± 1.87e-05
Arg. of Perihelion (ω)81.97198818° ± 2.01e-05
Mean Anomaly (M)337.91299271° ± 2.86e-06
Mean Motion (n)0.5588690105°/day ± 3.14e-10
Perihelion dist (q)0.99706632 AU ± 1.99e-08
Aphelion dist (Q)1.92236431 AU ± 1.99e-08
Orbital Period1.76360876 yr ± 9.92e-10
Physical Parameters
H (abs. magnitude)20.27
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.298″
Uncertainty0
Orbit TypeApollo
MOID0.050702 AU
Observations Used398
Oppositions12
Arc Total1997-2025
First Observation Used1997-11-26
Last Observation Used2025-04-28
Observations (422)
Date Type RA Dec Mag Band Observatory
1997-11-26 09:05:41 C 01 00 30.58 +23 12 42.0 c 566
1997-11-26 09:19:22 C 01 00 33.88 +23 12 39.5 c 566
1997-11-26 09:33:31 C 01 00 37.24 +23 12 36.6 c 566
1997-11-29 06:59:42 C 01 17 17.33 +22 59 36.2 c 566
1997-11-29 07:14:13 C 01 17 20.39 +22 59 32.7 c 566
1997-11-29 07:28:20 C 01 17 23.43 +22 59 29.9 c 566
1997-11-30 04:59:05 C 01 22 14.41 +22 54 49.3 c 566
1997-11-30 05:15:25 C 01 22 17.82 +22 54 46.5 c 566
1997-11-30 05:29:55 C 01 22 20.83 +22 54 44.1 c 566
1997-11-30 06:18:52 C 01 22 30.95 +22 54 34.2 c 566
1997-11-30 06:33:29 C 01 22 33.97 +22 54 30.9 c 566
1997-11-30 06:48:19 C 01 22 37.01 +22 54 28.3 c 566
1997-11-30 18:55:15 C 01 25 15.91 +22 51 24.7 z 587
1997-11-30 19:00:59 C 01 25 17.09 +22 51 23.4 z 587
1997-12-02 03:20:55 C 01 32 06.93 +22 43 56.8 658
1997-12-02 03:26:33 C 01 32 08.03 +22 43 55.2 658
1997-12-02 03:32:26 C 01 32 09.18 +22 43 54.2 658
1997-12-03 02:58:24 C 01 36 54.91 +22 38 23.5 658
1997-12-03 03:07:05 C 01 36 56.57 +22 38 21.8 658
1997-12-03 03:16:05 C 01 36 58.28 +22 38 20.3 658
1997-12-04 05:16:16 C 01 42 03.39 +22 32 10.3 658
1997-12-04 05:22:00 C 01 42 04.44 +22 32 09.2 658
1997-12-04 05:25:43 C 01 42 05.09 +22 32 08.3 658
1997-12-04 13:55:44 C 01 43 41.68 +22 30 14.6 z 402
1997-12-04 13:58:45 C 01 43 42.22 +22 30 13.3 z 402
1997-12-04 14:01:45 C 01 43 42.81 +22 30 11.7 z 402
1997-12-05 03:56:04 C 01 46 22.21 +22 26 45.6 658
1997-12-05 04:03:21 C 01 46 23.49 +22 26 44.6 658
1997-12-05 04:06:44 C 01 46 24.12 +22 26 43.5 658
1997-12-07 23:32:29 C 01 58 26.32 +22 10 53.2 z 587
1997-12-07 23:37:59 C 01 58 27.24 +22 10 51.7 z 587
1997-12-18 07:09:10 C 02 35 26.62 +21 21 49.1 658
1997-12-18 07:16:43 C 02 35 27.65 +21 21 47.0 658
1997-12-18 07:23:30 C 02 35 28.64 +21 21 46.6 658
1997-12-27 21:30:31 C 03 03 04.46 +20 53 50.0 z 104
1997-12-27 21:36:50 C 03 03 05.09 +20 53 49.5 z 104
1997-12-27 21:42:49 C 03 03 05.62 +20 53 46.8 z 104
1997-12-29 08:38:18 C 03 06 55.38 +20 51 14.5 o 566
1997-12-30 05:22:57 C 03 09 09.71 +20 49 42.2 z 711
1997-12-30 05:41:46 C 03 09 11.87 +20 49 40.6 z 711
1997-12-31 04:43:20 C 03 11 39.90 +20 48 14.1 z 711
1997-12-31 05:02:36 C 03 11 41.66 +20 48 12.5 z 711
1998-01-01 05:04:57 C 03 14 14.26 +20 46 51.0 z 711
1998-01-01 05:24:01 C 03 14 15.78 +20 46 49.7 z 711
2004-05-17 07:03:31 C 15 50 36.09 -26 30 28.3 c 926
2004-05-17 07:06:52 C 15 50 35.82 -26 30 27.1 c 926
2004-05-17 07:10:05 C 15 50 35.52 -26 30 26.3 c 926
2004-05-20 06:52:05 C 15 44 53.04 -26 09 35.8 c 926
2004-05-20 06:55:49 C 15 44 52.71 -26 09 34.4 c 926
2004-05-20 06:59:34 C 15 44 52.38 -26 09 33.1 c 926