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
1999-09-15 03:01:30 C 02 13 15.52 -24 03 33.7 z 859
1999-09-15 09:18:43 C 02 16 33.36 -23 47 49.3 848
1999-09-15 09:19:40 C 02 16 33.82 -23 47 46.4 848
1999-09-15 09:20:38 C 02 16 34.26 -23 47 43.3 848
1999-09-16 01:23:25 C 02 25 56.88 -22 50 06.3 d 046
1999-09-16 01:25:34 C 02 25 58.11 -22 49 58.2 d 046
1999-09-16 01:26:31 C 02 25 58.64 -22 49 54.6 d 046
1999-09-16 01:27:20 C 02 25 59.07 -22 49 51.1 d 046
1999-09-16 03:11:41 C 02 26 58.32 -22 42 44.6 595
1999-09-16 03:13:54 C 02 26 59.57 -22 42 35.2 595
1999-09-16 03:16:12 C 02 27 00.91 -22 42 25.4 595
1999-09-16 03:19:42 C 02 27 02.93 -22 42 10.7 595
1999-09-16 08:54:27 C 02 30 55.28 -22 18 38.2 848
1999-09-16 08:55:09 C 02 30 55.71 -22 18 35.4 848
1999-09-16 08:55:52 C 02 30 56.14 -22 18 32.4 848
1999-09-16 13:22:09 C 02 34 03.51 -21 52 54.6 z 428
1999-09-16 13:23:27 C 02 34 04.30 -21 52 49.5 z 428
1999-09-16 13:24:41 C 02 34 05.11 -21 52 43.8 z 428
1999-09-17 18:30:25 C 02 56 40.39 -19 12 03.3 z 322
1999-09-17 19:00:17 C 02 57 04.00 -19 08 47.3 z 322
1999-09-17 19:03:49 C 02 57 06.76 -19 08 24.6 z 322
1999-09-17 19:27:51 C 02 57 25.78 -19 05 45.0 z 322
1999-09-17 19:34:12 C 02 57 30.77 -19 05 02.8 z 322
1999-09-17 20:00:55 C 02 57 52.02 -19 02 02.4 z 322
1999-09-18 15:23:50 C 03 17 01.05 -16 34 18.3 z 428
1999-09-18 15:24:55 C 03 17 02.12 -16 34 09.2 z 428
1999-09-18 15:25:49 C 03 17 02.96 -16 34 01.8 z 428
1999-09-18 15:26:46 C 03 17 03.91 -16 33 53.6 z 428
1999-09-19 02:09:56 C 03 29 13.58 -14 54 55.3 z 859
1999-09-19 02:12:17 C 03 29 16.24 -14 54 33.1 z 859
1999-09-19 02:18:54 C 03 29 23.55 -14 53 31.0 z 859
1999-09-19 02:23:35 C 03 29 28.78 -14 52 46.5 z 859
1999-09-19 02:27:47 C 03 29 33.49 -14 52 05.4 z 859
1999-09-19 02:29:19 C 03 29 35.17 -14 51 51.2 z 859
1999-09-19 02:35:21 C 03 29 41.90 -14 50 53.7 z 859
1999-09-19 02:37:40 C 03 29 44.45 -14 50 31.8 z 859
1999-09-19 02:40:45 C 03 29 47.84 -14 50 02.6 z 859
1999-09-19 02:43:04 C 03 29 50.35 -14 49 40.3 z 859
1999-09-19 21:10:21 C 03 52 43.89 -11 31 22.4 14.5 327
1999-09-19 21:13:35 C 03 52 47.98 -11 30 41.7 14.5 327
1999-09-19 21:17:23 C 03 52 52.74 -11 29 54.4 14.4 327
1999-09-20 00:12:23 C 03 57 10.96 -10 53 37.2 z 121
1999-09-20 00:13:53 C 03 57 12.94 -10 53 18.0 z 121
1999-09-20 00:15:23 C 03 57 14.92 -10 52 58.9 z 121
1999-09-20 00:18:24 C 03 57 18.87 -10 52 20.4 z 121
1999-09-20 01:04:31 C 03 58 28.09 -10 42 13.0 d 046
1999-09-20 01:11:52 C 03 58 37.97 -10 40 39.0 d 046
1999-09-20 01:13:34 C 03 58 40.13 -10 40 16.8 d 046
1999-09-20 01:14:30 C 03 58 41.32 -10 40 05.2 d 046
1999-09-20 01:15:25 C 03 58 42.61 -10 39 52.6 d 046
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)