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
2011-08-30 04:16:30 C 03 56 12.11 +11 03 53.3 o 950
2011-08-30 04:23:07 C 03 56 13.88 +11 04 06.9 o 950
2011-09-12 09:40:51 C 05 35 12.36 +21 35 34.5 o H21
2011-09-12 09:50:43 C 05 35 15.58 +21 35 51.5 o H21
2011-09-12 09:57:57 C 05 35 17.97 +21 36 04.0 o H21
2011-09-14 03:43:11 C 05 49 32.91 +22 46 06.3 o 950
2011-09-14 03:46:18 C 05 49 33.94 +22 46 11.5 o 950
2011-09-14 03:49:25 C 05 49 35.00 +22 46 16.7 o 950
2011-09-14 03:54:11 C 05 49 36.58 +22 46 24.6 o 950
2011-09-14 03:58:09 C 05 49 37.91 +22 46 31.3 o 950
2011-09-14 04:01:52 C 05 49 39.15 +22 46 37.5 o 950
2011-09-14 04:04:59 C 05 49 40.19 +22 46 42.7 o 950
2011-09-14 04:08:05 C 05 49 41.22 +22 46 47.8 o 950
2011-09-14 04:11:11 C 05 49 42.26 +22 46 53.0 o 950
2011-09-14 04:14:19 C 05 49 43.29 +22 46 58.2 o 950
2011-09-14 04:18:16 C 05 49 44.63 +22 47 05.0 o 950
2011-09-14 04:21:23 C 05 49 45.66 +22 47 09.7 o 950
2011-09-14 04:24:29 C 05 49 46.69 +22 47 15.2 o 950
2011-09-14 04:28:22 C 05 49 47.97 +22 47 21.5 o 950
2011-09-14 04:32:14 C 05 49 49.27 +22 47 28.1 o 950
2011-09-14 04:35:31 C 05 49 50.36 +22 47 33.3 o 950
2011-09-14 04:39:25 C 05 49 51.66 +22 47 40.0 o 950
2011-09-14 04:42:30 C 05 49 52.68 +22 47 45.1 o 950
2011-09-14 04:46:24 C 05 49 53.99 +22 47 51.6 o 950
2011-09-14 04:50:58 C 05 49 55.51 +22 47 59.0 o 950
2011-09-14 05:00:08 C 05 49 58.53 +22 48 14.3 o 950
2011-09-14 05:04:10 C 05 49 59.87 +22 48 20.9 o 950
2011-09-14 05:08:02 C 05 50 01.16 +22 48 27.4 o 950
2011-09-14 05:11:26 C 05 50 02.29 +22 48 33.0 o 950
2011-09-14 05:14:10 C 05 50 03.18 +22 48 37.4 o 950
2011-09-14 05:18:03 C 05 50 04.47 +22 48 44.1 o 950
2011-09-14 05:21:09 C 05 50 05.47 +22 48 48.9 o 950
2011-09-14 05:24:24 C 05 50 06.59 +22 48 54.4 o 950
2011-09-14 05:27:44 C 05 50 07.71 +22 48 59.8 o 950
2011-09-23 10:08:44 C 07 05 36.03 +27 17 19.3 u H01
2011-09-23 10:26:44 C 07 05 41.92 +27 17 34.9 u H01
2011-09-23 10:43:19 C 07 05 47.31 +27 17 49.2 u H01
2011-09-23 10:58:53 C 07 05 52.37 +27 18 02.6 u H01
2011-09-25 11:51:52 C 07 21 59.76 +27 52 46.9 u H01
2011-09-25 12:02:42 C 07 22 03.17 +27 52 54.2 u H01
2011-09-25 12:07:11 C 07 22 04.58 +27 52 57.1 u H01
2011-09-25 12:12:15 C 07 22 06.20 +27 53 00.5 u H01
2011-09-25 13:42:07 C 07 22 36.707 +27 53 59.94 L F51
2011-09-25 13:55:31 C 07 22 40.990 +27 54 09.00 L F51
2011-09-25 14:02:19 C 07 22 43.105 +27 54 13.64 L F51
2011-09-26 09:54:20 C 07 29 09.25 +28 05 27.8 u H01
2011-09-26 10:59:52 C 07 29 29.92 +28 06 07.4 u H01
2011-09-26 11:21:30 C 07 29 36.67 +28 06 20.3 u H01
2011-09-29 10:24:25 C 07 51 58.78 +28 35 45.5 o H01
2011-09-29 10:50:28 C 07 52 06.62 +28 35 55.0 o H01
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)