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
2008-10-30 11:41:56 C 09 00 48.30 +15 24 04.6 o 691
2008-10-30 12:00:06 C 09 00 50.23 +15 23 58.0 o 691
2008-10-30 12:18:18 C 09 00 52.08 +15 23 51.8 o 691
2009-01-31 12:31:31 C 15 03 18.68 -07 24 09.7 r 703
2009-01-31 12:41:21 C 15 03 20.80 -07 24 15.4 r 703
2009-01-31 12:51:07 C 15 03 23.14 -07 24 22.3 r 703
2009-01-31 13:00:46 C 15 03 25.48 -07 24 29.0 r 703
2009-01-31 13:12:11 C 15 03 28.08 -07 24 37.4 r 703
2009-01-31 13:13:33 C 15 03 28.40 -07 24 38.0 r 703
2009-01-31 13:14:55 C 15 03 28.58 -07 24 38.8 r 703
2009-01-31 13:16:18 C 15 03 28.98 -07 24 39.7 r 703
2009-02-01 10:17:23 C 15 08 27.95 -07 39 11.1 r 448
2009-02-01 10:35:12 C 15 08 32.15 -07 39 23.9 r 448
2009-02-01 10:53:02 C 15 08 36.11 -07 39 36.2 r 448
2009-02-01 12:54:35 C 15 09 04.71 -07 40 59.5 r G96
2009-02-01 12:55:22 C 15 09 04.86 -07 40 59.7 r G96
2009-02-01 13:00:06 C 15 09 05.97 -07 41 02.9 r G96
2009-02-01 13:00:52 C 15 09 06.15 -07 41 03.5 r G96
2009-02-01 13:05:33 C 15 09 07.23 -07 41 06.7 r G96
2009-02-01 13:06:22 C 15 09 07.41 -07 41 07.0 r G96
2009-02-01 13:11:02 C 15 09 08.53 -07 41 09.9 r G96
2009-02-01 13:18:16 C 15 09 10.07 -07 41 15.1 r 703
2009-02-01 13:19:52 C 15 09 10.42 -07 41 17.1 r 703
2009-02-02 10:41:05 C 15 14 14.54 -07 55 43.2 c 854
2009-02-02 10:48:00 C 15 14 16.07 -07 55 47.0 c 854
2009-02-02 10:54:54 C 15 14 17.72 -07 55 53.2 c 854
2009-02-02 11:27:26 C 15 14 24.92 -07 56 15.5 o H55
2009-02-02 11:30:23 C 15 14 25.62 -07 56 17.6 o H55
2009-02-02 11:33:22 C 15 14 26.31 -07 56 19.6 o H55
2009-02-02 11:46:33 C 15 14 29.76 -07 56 26.7 o 291
2009-02-02 11:51:56 C 15 14 31.03 -07 56 30.8 o 291
2009-02-02 11:57:27 C 15 14 32.26 -07 56 33.7 o 291
2009-02-13 13:02:54 C 16 16 42.76 -10 29 57.2 r 703
2009-02-13 13:04:40 C 16 16 43.24 -10 29 59.0 r 703
2009-02-16 10:42:04 C 16 32 36.01 -11 01 28.3 o H55
2009-02-16 10:47:02 C 16 32 37.11 -11 01 30.8 o H55
2009-02-16 10:53:29 C 16 32 38.57 -11 01 33.9 o H55
2009-02-16 10:58:38 C 16 32 39.74 -11 01 36.1 o H55
2009-02-28 18:40:53 C 17 36 12.70 -12 33 06.3 r E12
2009-02-28 18:41:49 C 17 36 12.81 -12 33 06.1 r E12
2009-05-05 19:29:00 C 21 13 11.45 -11 04 35.6 r E12
2009-05-05 19:34:53 C 21 13 11.92 -11 04 34.9 r E12
2009-05-21 08:29:02 C 21 37 15.91 -10 55 20.0 o H55
2009-05-21 08:32:55 C 21 37 16.14 -10 55 20.2 o H55
2009-05-21 08:36:07 C 21 37 16.32 -10 55 20.3 o H55
2009-06-28 15:56:00 C 21 46 31.98 -14 59 01.1 r E12
2009-06-28 16:14:02 C 21 46 31.33 -14 59 09.8 r E12
2009-06-28 16:32:25 C 21 46 30.68 -14 59 19.8 r E12
2009-06-28 16:50:38 C 21 46 29.96 -14 59 28.7 r E12
2009-07-14 03:49:52 C 21 28 33.62 -18 24 51.8 18.8 r I36
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)