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
2019-01-12 12:40:47 C 09 41 47.11 +17 58 33.3 V T05
2019-01-12 12:42:40 C 09 41 47.22 +17 58 34.4 V T05
2019-01-12 12:57:03 C 09 41 47.87 +17 58 41.7 V T05
2019-01-15 02:18:25 C 09 45 03.81 +18 31 48.6 q 160
2019-01-15 02:21:28 C 09 45 03.95 +18 31 50.2 q 160
2019-01-15 02:24:38 C 09 45 04.13 +18 31 51.7 q 160
2019-01-16 11:16:51 C 09 46 51.32 +18 51 48.3 V T05
2019-01-16 11:23:16 C 09 46 51.61 +18 51 52.2 V T05
2019-01-16 11:26:25 C 09 46 51.78 +18 51 54.1 V T05
2019-01-16 11:40:39 C 09 46 52.47 +18 52 02.8 V T05
2019-01-17 06:09:11 C 09 47 53.57 +19 03 42.2 V G96
2019-01-17 06:16:31 C 09 47 53.94 +19 03 47.0 V G96
2019-01-17 06:23:51 C 09 47 54.31 +19 03 52.0 V G96
2019-01-17 06:31:11 C 09 47 54.67 +19 03 56.8 V G96
2019-01-18 10:36:37 C 09 49 27.10 +19 22 52.2 V T08
2019-01-18 10:56:23 C 09 49 28.06 +19 23 06.2 V T08
2019-01-18 11:15:49 C 09 49 29.01 +19 23 20.1 V T08
2019-01-18 11:16:29 C 09 49 29.05 +19 23 20.1 V T08
2019-01-20 07:17:05 C 09 51 57.27 +19 55 02.9 I41
2019-01-20 07:40:41 C 09 51 58.49 +19 55 21.3 I41
2019-01-20 08:04:31 C 09 51 59.69 +19 55 39.7 I41
2019-01-20 08:28:50 C 09 52 00.92 +19 55 58.2 I41
2019-01-20 10:08:34 C 09 52 05.91 +19 57 14.2 I41
2019-01-20 10:23:14 C 09 52 07.72 +19 57 29.7 V T05
2019-01-20 10:32:13 C 09 52 07.09 +19 57 32.1 I41
2019-01-20 10:35:28 C 09 52 08.34 +19 57 39.3 V T05
2019-01-20 10:36:47 C 09 52 08.43 +19 57 40.5 V T05
2019-01-20 10:49:38 C 09 52 09.06 +19 57 50.4 V T05
2019-01-20 10:55:48 C 09 52 08.27 +19 57 49.9 I41
2019-01-24 11:52:42 C 09 57 49.75 +21 19 24.2 V T05
2019-01-24 12:15:22 C 09 57 50.92 +21 19 45.2 V T05
2019-01-24 12:35:01 C 09 57 51.95 +21 20 03.3 V T05
2019-01-26 02:29:56 C 10 00 11.97 +21 56 10.9 q 160
2019-01-26 02:32:53 C 10 00 12.16 +21 56 14.4 q 160
2019-01-26 02:35:49 C 10 00 12.30 +21 56 16.9 q 160
2019-01-26 09:40:23 C 10 00 39.41 +22 03 27.2 V 703
2019-01-26 09:46:58 C 10 00 39.77 +22 03 33.7 V 703
2019-01-26 09:53:33 C 10 00 40.12 +22 03 40.1 V 703
2019-01-26 10:00:08 C 10 00 40.49 +22 03 46.7 V 703
2019-01-26 10:40:24 C 10 00 42.74 +22 04 26.8 V G96
2019-01-26 10:47:46 C 10 00 43.16 +22 04 34.1 V G96
2019-01-26 10:55:08 C 10 00 43.56 +22 04 41.4 V G96
2019-01-26 11:02:29 C 10 00 43.98 +22 04 48.6 V G96
2019-01-28 08:15:38 C 10 03 40.82 +22 52 25.4 V 703
2019-01-28 08:23:10 C 10 03 41.27 +22 52 33.5 V 703
2019-01-28 08:30:42 C 10 03 41.72 +22 52 42.0 V 703
2019-01-28 08:38:15 C 10 03 42.16 +22 52 50.4 V 703
2019-01-30 09:07:23 C 10 07 00.36 +23 48 28.0 U I41
2019-01-30 10:24:19 C 10 07 05.08 +23 49 59.8 U I41
2019-01-30 10:26:18 C 10 07 05.21 +23 50 02.2 U I41
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)