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
2004-05-20 07:03:14 C 15 44 52.04 -26 09 32.0 c 926
2004-05-20 07:07:00 C 15 44 51.74 -26 09 30.7 c 926
2004-12-11 01:26:56 C 23 03 49.469 +00 03 13.67 n 645
2004-12-11 01:31:42 C 23 03 50.441 +00 03 18.62 n 645
2004-12-13 01:53:48 C 23 14 05.071 +00 56 12.01 n 645
2004-12-13 01:58:35 C 23 14 06.072 +00 56 17.48 n 645
2006-04-30 14:02:18 C 21 46 44.67 -13 49 35.3 t 568
2006-04-30 14:10:39 C 21 46 45.90 -13 49 27.8 t 568
2006-04-30 14:18:52 C 21 46 47.12 -13 49 20.7 t 568
2007-01-26 10:52:22 C 09 44 04.20 +08 59 40.6 o 291
2007-01-26 10:58:16 C 09 44 03.75 +08 59 41.7 o 291
2007-01-26 11:03:41 C 09 44 03.34 +08 59 42.9 o 291
2011-05-22 06:40:20 C 14 06 05.43 -19 26 30.4 o 291
2011-05-22 06:46:24 C 14 06 05.02 -19 26 28.3 o 291
2011-05-22 06:51:55 C 14 06 04.62 -19 26 25.1 o 291
2013-11-28 12:41:35 C 09 23 29.67 +16 28 19.2 q G96
2013-11-28 12:47:34 C 09 23 29.76 +16 28 16.6 q G96
2013-11-28 12:53:34 C 09 23 29.86 +16 28 14.9 q G96
2013-11-28 12:59:35 C 09 23 29.92 +16 28 12.8 q G96
2013-12-06 12:31:00 C 09 25 12.20 +15 41 15.1 o 926
2013-12-06 12:47:06 C 09 25 12.07 +15 41 12.7 o 926
2013-12-06 13:03:04 C 09 25 12.02 +15 41 08.9 o 926
2013-12-11 09:35:12 C 09 24 14.07 +15 20 32.0 q G96
2013-12-11 09:36:41 C 09 24 14.04 +15 20 31.7 q G96
2013-12-11 09:43:47 C 09 24 13.92 +15 20 30.6 q G96
2013-12-11 09:45:16 C 09 24 13.86 +15 20 30.8 q G96
2013-12-11 09:52:22 C 09 24 13.72 +15 20 29.7 q G96
2013-12-11 09:53:50 C 09 24 13.70 +15 20 28.6 q G96
2013-12-11 10:00:56 C 09 24 13.63 +15 20 28.6 q G96
2013-12-11 10:02:25 C 09 24 13.58 +15 20 28.2 q G96
2014-01-26 22:39:48 C 08 10 38.08 +16 22 20.0 21.0 u J43
2014-01-26 22:54:40 C 08 10 36.84 +16 22 22.4 21.1 u J43
2014-01-26 23:09:30 C 08 10 35.64 +16 22 24.0 20.5 u J43
2014-01-26 23:24:27 C 08 10 34.38 +16 22 25.6 20.8 u J43
2014-02-08 05:41:20 C 07 51 08.34 +16 55 57.8 o 711
2014-02-08 05:46:59 C 07 51 08.02 +16 55 58.4 o 711
2014-02-08 05:52:36 C 07 51 07.76 +16 55 58.8 o 711
2014-02-09 05:22:11 C 07 49 56.64 +16 58 06.3 o 711
2014-02-09 05:28:15 C 07 49 56.31 +16 58 06.8 o 711
2014-02-09 05:33:58 C 07 49 56.07 +16 58 07.4 o 711
2016-03-31 08:30:42 C 10 51 48.835 +00 13 11.70 L F51
2016-03-31 09:05:59 C 10 51 47.096 +00 13 24.73 L F51
2016-03-31 09:23:40 C 10 51 46.191 +00 13 31.16 L F51
2020-06-20 12:12:03 C 21 13 45.59 -16 16 23.7 V T08
2020-06-20 12:16:41 C 21 13 46.03 -16 16 20.6 V T08
2020-06-20 12:25:21 C 21 13 46.93 -16 16 12.1 V T08
2020-06-20 12:41:16 C 21 13 48.47 -16 15 58.5 V T08
2020-06-21 12:43:16 C 21 16 17.813 -15 54 31.13 U F52
2020-06-21 12:57:18 C 21 16 19.172 -15 54 18.51 U F52
2020-06-21 13:11:24 C 21 16 20.538 -15 54 05.73 U F52