381677 (2009 BJ81)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.4559023253 ± 1.80e-09
Semi-major axis (a)1.8508835724 AU ± 3.40e-10
Inclination (i)5.84137620° ± 2.95e-07
Long. of Asc. Node (Ω)108.46981986° ± 3.28e-06
Arg. of Perihelion (ω)90.65455555° ± 3.58e-06
Mean Anomaly (M)227.94640423° ± 3.89e-07
Mean Motion (n)0.3914205519°/day ± 1.08e-10
Perihelion dist (q)1.00706145 AU ± 3.33e-09
Aphelion dist (Q)2.69470570 AU ± 3.36e-09
Orbital Period2.51807494 yr ± 6.94e-10
Physical Parameters
H (abs. magnitude)18.36
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-06-01
RMS Residual0.163″
Uncertainty0
Orbit TypeApollo
MOID0.098181 AU
Observations Used1684
Radar Obs Used3
Oppositions10
Arc Total2008-2024
First Observation Used2008-10-30
Last Observation Used2025-11-24
Observations (1949)
Date Type RA Dec Mag Band Observatory
2019-06-16 10:04:06 C 19 28 35.98 -13 50 08.1 V T05
2019-06-16 10:13:20 C 19 28 35.33 -13 50 17.9 V T05
2019-06-16 10:27:55 C 19 28 34.31 -13 50 33.8 V T05
2019-06-28 08:00:35 C 19 10 17.52 -18 27 59.3 q H47
2019-06-28 08:16:14 C 19 10 16.42 -18 28 12.5 q H47
2019-06-28 08:26:17 C 19 10 15.77 -18 28 21.0 q H47
2019-07-03 11:07:36 C 19 02 53.98 -20 06 22.5 V T08
2019-07-03 11:36:42 C 19 02 52.13 -20 06 43.9 V T08
2019-07-03 11:44:47 C 19 02 51.61 -20 06 49.5 V T08
2019-07-05 11:42:24 C 19 00 11.18 -20 41 25.2 V T05
2019-07-05 11:45:04 C 19 00 11.01 -20 41 27.2 V T05
2019-07-05 11:50:24 C 19 00 10.67 -20 41 30.6 V T05
2019-07-05 11:59:34 C 19 00 10.14 -20 41 36.9 V T05
2019-07-05 12:05:01 C 19 00 09.81 -20 41 40.8 V T05
2019-07-08 08:21:57 C 18 56 38.06 -21 27 18.0 V T05
2019-07-08 08:23:19 C 18 56 38.00 -21 27 18.8 V T05
2019-07-08 08:32:31 C 18 56 37.46 -21 27 24.8 V T05
2019-07-08 10:39:31 C 18 56 30.39 -21 28 46.1 V T05
2019-07-09 07:37:41 C 18 55 28.69 -21 41 56.5 q H47
2019-07-09 07:47:58 C 18 55 28.19 -21 42 02.6 q H47
2019-07-09 08:02:30 C 18 55 27.38 -21 42 10.7 q H47
2019-07-10 10:04:46 C 18 54 14.78 -21 57 55.2 V T05
2019-07-10 10:12:21 C 18 54 14.39 -21 57 59.8 V T05
2019-07-10 10:34:55 C 18 54 13.21 -21 58 13.2 V T05
2020-10-13 07:09:31 C 02 59 20.53 +07 53 02.2 u H21
2020-10-13 07:18:00 C 02 59 20.18 +07 53 00.3 u H21
2020-12-06 08:05:36 C 01 58 34.527 +03 55 46.68 U F51
2020-12-06 08:34:01 C 01 58 33.636 +03 55 46.34 U F51
2020-12-06 08:48:30 C 01 58 33.208 +03 55 46.14 U F51
2022-09-23 10:28:42 C 00 13 58.624 -08 20 28.19 U F51
2022-09-23 10:45:33 C 00 13 57.747 -08 20 34.08 U F51
2022-09-23 11:19:30 C 00 13 55.984 -08 20 45.41 U F51
2023-10-19 14:02:19 C 07 09 46.927 +18 27 01.68 X F52
2023-10-19 14:39:37 C 07 09 49.044 +18 26 58.34 X F52
2023-10-19 14:58:27 C 07 09 50.130 +18 26 56.32 X F52
2023-10-25 12:55:39 C 07 17 54.368 +18 13 43.46 X F52
2023-10-25 13:14:04 C 07 17 55.377 +18 13 41.85 X F52
2023-10-25 13:32:29 C 07 17 56.382 +18 13 40.22 X F52
2023-10-25 13:50:55 C 07 17 57.357 +18 13 38.61 X F52
2023-11-13 12:12:02 C 07 40 29.767 +17 35 56.45 X F52
2023-11-13 12:29:37 C 07 40 30.491 +17 35 55.36 X F52
2023-11-13 12:47:24 C 07 40 31.205 +17 35 54.06 X F52
2023-11-13 13:05:00 C 07 40 31.942 +17 35 53.33 X F52
2023-11-18 12:02:48 C 07 45 21.330 +17 29 28.49 X F52
2023-11-18 12:21:21 C 07 45 21.991 +17 29 27.78 X F52
2023-11-18 12:39:55 C 07 45 22.668 +17 29 27.04 X F52
2023-12-04 10:32:36 C 07 56 42.011 +17 30 14.52 X F52
2023-12-04 10:50:13 C 07 56 42.316 +17 30 15.71 X F52
2023-12-04 11:07:52 C 07 56 42.625 +17 30 16.97 X F52
2023-12-04 11:25:35 C 07 56 42.931 +17 30 18.09 X F52
Radar Observations (3)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2024-05-14 01:20:00 90229.5 0.1 Hz 8560 -14 -14
2024-05-14 02:30:00 122376775.9 11 us 8560 -14 -14
2024-05-18 00:40:00 120904971 1 us 8560 -14 -14
Station codes
-14 DSS-14 Goldstone (70-m)