101955 Bennu (1999 RQ36)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.2037021394 ± 1.43e-07
Semi-major axis (a)1.1260024860 AU ± 7.18e-10
Inclination (i)6.03213938° ± 1.73e-05
Long. of Asc. Node (Ω)1.96888645° ± 1.52e-05
Arg. of Perihelion (ω)66.40871114° ± 2.96e-05
Mean Anomaly (M)267.46828697° ± 1.88e-05
Mean Motion (n)0.8249037010°/day ± 7.89e-10
Perihelion dist (q)0.89663337 AU ± 1.61e-07
Aphelion dist (Q)1.35537160 AU ± 1.61e-07
Orbital Period1.19483799 yr ± 1.14e-09
Physical Parameters
H (abs. magnitude)20.21
G (slope)-0.03
Diameter0.484 km
Geometric Albedo0.044
Rotation Period4.296 h
SMASS II TypeB
Orbit Solution
SourceIAA
Solution Date2026-06-08
RMS Residual10.733″
Uncertainty0
Orbit TypeApollo
MOID0.003758 AU
Observations Used603
Radar Obs Used29
Oppositions4
Arc Total1999-2025
First Observation Used1999-09-11
Last Observation Used2025-04-28
Observations (603)
Date Type RA Dec Mag Band Observatory
2012-06-14 04:44:35 C 13 30 13.11 -26 14 51.6 o H01
2012-06-14 04:59:34 C 13 30 13.22 -26 14 47.9 o H01
2012-06-14 05:20:25 C 13 30 13.38 -26 14 42.7 o H01
2012-06-15 04:55:06 C 13 30 31.97 -26 09 24.3 o H01
2012-06-15 05:06:21 C 13 30 32.08 -26 09 21.6 o H01
2012-06-15 05:15:10 C 13 30 32.17 -26 09 19.6 o H01
2012-06-15 05:25:18 C 13 30 32.28 -26 09 17.2 o H01
2012-06-21 04:31:12 C 13 33 38.71 -25 43 15.4 o H01
2012-06-21 04:41:38 C 13 33 38.95 -25 43 13.8 o H01
2012-06-21 04:51:29 C 13 33 39.20 -25 43 12.2 o H01
2012-06-21 05:00:49 C 13 33 39.44 -25 43 10.7 o H01
2013-01-19 01:51:21 C 23 41 00.92 +04 26 44.4 t H01
2013-01-19 02:02:44 C 23 41 02.75 +04 26 59.0 t H01
2013-01-19 02:12:21 C 23 41 04.30 +04 27 11.6 t H01
2013-01-19 02:22:38 C 23 41 05.95 +04 27 24.8 t H01
2013-01-20 01:47:59 C 23 44 54.57 +04 57 42.1 t H01
2013-01-20 02:00:31 C 23 44 56.59 +04 57 58.1 t H01
2013-01-20 02:13:53 C 23 44 58.74 +04 58 15.4 t H01
2013-01-20 02:41:07 C 23 45 03.15 +04 58 50.4 t H01
2017-08-01 14:05:13 C 02 26 12.575 +05 02 01.85 L F51
2017-08-01 14:17:36 C 02 26 14.789 +05 02 18.27 L F51
2017-08-01 14:29:51 C 02 26 16.958 +05 02 34.50 L F51
2017-08-01 14:42:11 C 02 26 19.133 +05 02 50.72 L F51
2017-09-01 14:08:40 C 05 11 06.762 +21 45 33.81 L F51
2017-09-01 14:16:08 C 05 11 08.658 +21 45 42.31 L F51
2017-09-01 14:23:34 C 05 11 10.524 +21 45 50.71 L F51
2017-09-01 14:31:01 C 05 11 12.419 +21 45 59.19 L F51
2018-05-15 18:12:29 C 15 31 01.79 -38 40 23.7 q Q62
2018-05-15 18:33:34 C 15 30 58.84 -38 40 22.0 q Q62
2018-05-15 18:55:30 C 15 30 55.84 -38 40 19.8 q Q62
2023-10-03 11:13:32 C 08 40 08.74 +24 59 16.1 V 291
2023-10-03 11:46:45 C 08 40 15.66 +24 59 00.2 V 291
2023-10-03 11:49:40 C 08 40 16.31 +24 58 58.8 V 695
2023-10-03 12:01:26 C 08 40 18.72 +24 58 53.3 V 695
2023-10-03 12:13:11 C 08 40 21.16 +24 58 47.5 V 695
2024-07-05 23:45:35 B 15 09 19.992 -37 17 40.48 Z Y05
2024-07-06 00:38:27 B 15 09 18.900 -37 17 12.15 Z Y05
2024-07-06 23:07:40 B 15 09 03.560 -37 05 37.92 Z Y05
2024-07-07 00:00:32 B 15 09 02.726 -37 05 10.04 Z Y05
2024-12-27 01:34:54 C 22 32 10.170 +00 03 02.00 V 691
2024-12-27 02:11:32 C 22 32 15.440 +00 03 49.80 V 691
2025-01-24 02:07:53 C 00 22 11.060 +15 53 55.90 V 291
2025-01-24 02:16:48 C 00 22 12.610 +15 54 08.10 V 291
2025-01-24 02:25:41 C 00 22 14.160 +15 54 19.50 V 291
2025-01-27 02:18:40 C 00 35 59.570 +17 36 15.70 V 691
2025-01-27 02:42:54 C 00 36 04.250 +17 36 49.60 V 691
2025-01-27 03:07:09 C 00 36 08.950 +17 37 24.90 V 691
2025-04-01 19:08:44 C 06 58 35.447 +26 28 15.20 X 033
2025-04-01 19:13:02 C 06 58 36.336 +26 28 11.50 X 033
2025-04-01 19:17:18 C 06 58 37.236 +26 28 07.80 X 033
Radar Observations (29)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
1999-09-21 09:00:00 135959 5 Hz 8560 -14 -14
1999-09-21 10:20:00 15418454 10 us 8560 -14 -14
1999-09-23 09:30:00 14820631 5 us 8560 -14 -14
1999-09-23 09:36:00 14800106.19 1 us 2380 -1 -1
1999-09-23 11:28:00 14846130.16 1 us 2380 -1 -1
1999-09-24 10:26:00 15838961.63 1 us 2380 -1 -1
1999-09-24 12:23:00 15955075.55 1 us 2380 -1 -1
1999-09-25 11:09:00 17634668.28 1 us 2380 -1 -1
1999-09-25 12:55:00 17785960.83 1 us 2380 -1 -1
1999-10-01 13:40:00 35441297 1 us 8560 -14 -14
2005-09-16 08:44:00 47170.7359 1 Hz 2380 -1 -1
2005-09-16 08:45:00 36658796.03 0.5 us 2380 -1 -1
2005-09-16 09:27:00 36609699.09 0.5 us 2380 -1 -1
2005-09-18 12:20:00 33873463 1 us 8560 -14 -14
2005-09-19 12:50:00 33215505.86 1 us 8560 -14 -14
2005-09-20 09:06:00 2631.7168 1 Hz 2380 -1 -1
2005-09-20 09:09:00 33024251.3 0.5 us 2380 -1 -1
2005-09-20 11:24:00 33024222.68 0.5 us 2380 -1 -1
2005-09-28 11:57:00 45550976.4 0.5 us 2380 -1 -1
2005-09-28 12:00:00 -73137.0697 1 Hz 2380 -1 -1
2005-09-28 13:35:00 45734943.4 0.5 us 2380 -1 -1
2005-10-02 12:55:00 57594268.2 0.5 us 2380 -1 -1
2005-10-02 14:10:00 57762582.67 0.5 us 2380 -1 -1
2011-09-27 11:39:00 197293588.79 2 us 2380 -1 -1
2011-09-27 11:39:00 -66400.2088 1 Hz 2380 -1 -1
2011-09-28 11:08:00 199711477.27 2 us 2380 -1 -1
2011-09-28 11:08:00 -68554.7858 1 Hz 2380 -1 -1
2011-09-29 11:55:00 202378520.04 2 us 2380 -1 -1
2011-09-29 11:55:00 -72841.0156 1 Hz 2380 -1 -1
Station codes
-14 DSS-14 Goldstone (70-m) -1 Arecibo (305-m, 1963–2020)