IAA RAS IAA Minor Planet Database

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
2019-03-25 11:10:07 C 17 32 24.96 +44 18 02.2 – V 703
2019-03-25 11:17:49 C 17 32 27.62 +44 17 38.4 – V 703
2019-03-25 11:25:29 C 17 32 30.38 +44 17 15.0 – V 703
2019-03-25 11:33:11 C 17 32 33.05 +44 16 50.6 – V 703
2019-03-26 17:08:14 C 17 43 13.72 +42 41 08.9 – q 168
2019-03-26 17:18:51 C 17 43 17.51 +42 40 35.9 – q 168
2019-03-26 18:32:54 C 17 43 43.51 +42 36 47.5 – q 168
2019-03-26 19:42:08 C 17 44 07.37 +42 33 13.7 – q 168
2019-03-26 21:45:41 C 17 44 48.89 +42 26 52.0 – q 168
2019-03-29 02:28:11 C 18 01 26.08 +39 37 54.0 – U 089
2019-03-29 02:31:35 C 18 01 27.02 +39 37 43.1 – U 089
2019-03-29 02:34:59 C 18 01 27.98 +39 37 31.9 – V 089
2019-03-29 02:38:23 C 18 01 28.91 +39 37 21.6 – U 089
2019-03-30 02:28:40 C 18 08 13.81 +38 21 15.4 – U 089
2019-03-30 02:35:46 C 18 08 15.65 +38 20 53.2 – U 089
2019-03-30 02:43:10 C 18 08 17.51 +38 20 29.8 – U 089
2019-03-30 02:46:33 C 18 08 18.40 +38 20 19.6 – U 089
2019-04-01 19:15:35 S 18 24 23.592 +34 58 54.84 – L C51
2019-04-01 22:24:05 S 18 25 06.614 +34 49 18.62 – L C51
2019-04-02 01:32:35 S 18 25 49.294 +34 39 43.78 – L C51
2019-04-02 04:40:54 S 18 26 31.634 +34 30 10.08 – L C51
2019-04-02 06:15:09 S 18 26 52.644 +34 25 23.70 – L C51
2019-04-02 07:49:24 S 18 27 13.598 +34 20 37.75 – L C51
2019-04-02 09:23:39 S 18 27 34.435 +34 15 52.38 – L C51
2019-04-02 10:57:54 S 18 27 55.236 +34 11 07.30 – L C51
2019-04-02 12:31:25 S 18 28 15.826 +34 06 20.81 – L C51
2019-04-02 15:40:28 S 18 28 57.007 +33 56 53.30 – L C51
2019-04-02 17:14:43 S 18 29 17.453 +33 52 09.48 – L C51
2019-04-02 20:23:14 S 18 29 58.07 +33 42 43.0 – L C51
2019-04-02 21:57:29 S 18 30 18.25 +33 38 00.4 – L C51
2019-04-02 23:31:43 S 18 30 38.32 +33 33 17.7 – L C51
2019-04-03 01:05:58 S 18 30 58.36 +33 28 36.0 – L C51
2019-04-03 02:40:13 S 18 31 18.30 +33 23 54.3 – L C51
2019-04-03 04:14:18 S 18 31 38.14 +33 19 12.5 – L C51
2019-04-03 07:22:48 S 18 32 17.60 +33 09 51.2 – L C51
2019-04-03 08:57:03 S 18 32 37.222 +33 05 10.93 – L C51
2019-04-03 10:31:18 S 18 32 56.77 +33 00 31.1 – L C51
2019-04-03 12:05:33 S 18 33 16.23 +32 55 51.8 – L C51
2019-04-03 13:39:48 S 18 33 35.606 +32 51 12.60 – L C51
2019-04-03 15:14:03 S 18 33 54.91 +32 46 34.1 – L C51
2019-04-03 16:48:06 S 18 34 14.11 +32 41 55.3 – L C51
2019-04-03 19:56:37 S 18 34 52.32 +32 32 40.0 – L C51
2019-04-03 23:05:07 S 18 35 30.245 +32 23 25.94 – L C51
2019-04-04 02:11:36 C 18 36 11.78 +32 14 07.4 – U 089
2019-04-04 02:13:37 S 18 36 07.858 +32 14 13.85 – L C51
2019-04-04 02:15:00 C 18 36 12.40 +32 13 58.1 – U 089
2019-04-04 02:18:36 C 18 36 13.04 +32 13 47.6 – U 089
2019-04-04 02:21:59 C 18 36 13.68 +32 13 37.5 – U 089
2019-04-04 02:25:22 C 18 36 14.27 +32 13 28.5 – U 089
2019-04-04 02:28:46 C 18 36 14.94 +32 13 18.2 – U 089
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)