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
1999-09-13 09:06:52 C 01 54 04.76 -25 50 45.3 848
1999-09-13 13:54:06 C 01 56 06.13 -25 36 37.0 d 426
1999-09-13 13:57:11 C 01 56 07.23 -25 36 31.5 d 426
1999-09-13 13:59:57 C 01 56 08.26 -25 36 26.7 d 426
1999-09-13 14:26:24 C 01 56 14.35 -25 36 05.4 z 428
1999-09-13 14:28:38 C 01 56 15.11 -25 36 01.2 z 428
1999-09-13 14:30:49 C 01 56 15.87 -25 35 57.1 z 428
1999-09-13 14:33:25 C 01 56 16.76 -25 35 52.2 z 428
1999-09-14 00:12:08 C 02 00 17.67 -25 18 59.0 d 046
1999-09-14 00:13:52 C 02 00 18.36 -25 18 55.1 d 046
1999-09-14 00:15:31 C 02 00 18.98 -25 18 51.8 d 046
1999-09-14 00:17:04 C 02 00 19.58 -25 18 48.3 d 046
1999-09-14 00:41:16 C 02 00 27.85 -25 17 51.4 15.4 z 629
1999-09-14 00:48:24 C 02 00 30.38 -25 17 35.5 15.5 z 629
1999-09-14 00:51:48 C 02 00 31.76 -25 17 27.3 16.2 z 629
1999-09-14 00:55:21 C 02 00 33.03 -25 17 19.9 16.0 z 629
1999-09-14 00:56:45 C 02 00 33.62 -25 17 16.7 16.4 z 629
1999-09-14 00:59:12 C 02 00 34.60 -25 17 12.3 15.5 z 629
1999-09-14 01:01:37 C 02 00 35.49 -25 17 05.6 15.8 z 629
1999-09-14 01:04:08 C 02 00 36.45 -25 16 59.7 16.1 z 629
1999-09-14 01:05:56 C 02 00 37.12 -25 16 55.6 15.8 z 629
1999-09-14 01:07:48 C 02 00 37.83 -25 16 51.7 16.3 z 629
1999-09-14 09:09:52 C 02 04 16.51 -24 57 06.0 15.4 a 704
1999-09-14 09:27:57 C 02 04 23.64 -24 56 20.6 15.5 a 704
1999-09-14 09:46:03 C 02 04 30.81 -24 55 35.0 15.5 a 704
1999-09-14 10:04:22 C 02 04 38.05 -24 54 48.4 15.8 a 704
1999-09-14 10:22:46 C 02 04 45.37 -24 54 00.8 15.9 a 704
1999-09-14 12:14:20 C 02 05 50.68 -24 44 18.4 c 467
1999-09-14 12:15:04 C 02 05 50.99 -24 44 16.9 c 467
1999-09-14 12:15:48 C 02 05 51.30 -24 44 15.0 c 467
1999-09-14 12:16:32 C 02 05 51.60 -24 44 13.4 c 467
1999-09-14 12:28:21 C 02 05 56.62 -24 43 45.0 c 467
1999-09-14 14:52:39 C 02 07 03.72 -24 37 53.8 413
1999-09-14 14:54:05 C 02 07 04.32 -24 37 50.2 413
1999-09-14 17:12:18 C 02 08 00.44 -24 31 54.2 z 428
1999-09-14 17:14:27 C 02 08 01.35 -24 31 47.9 z 428
1999-09-14 17:16:35 C 02 08 02.26 -24 31 41.6 z 428
1999-09-14 17:18:42 C 02 08 03.13 -24 31 35.8 z 428
1999-09-15 01:19:26 C 02 12 10.84 -24 13 08.7 c 118
1999-09-15 01:22:07 C 02 12 12.07 -24 13 00.7 c 118
1999-09-15 01:23:38 C 02 12 12.80 -24 12 56.1 c 118
1999-09-15 01:53:54 C 02 12 27.50 -24 11 25.7 d 046
1999-09-15 01:55:42 C 02 12 28.33 -24 11 20.3 d 046
1999-09-15 01:56:43 C 02 12 28.81 -24 11 17.3 d 046
1999-09-15 01:57:44 C 02 12 29.28 -24 11 14.0 d 046
1999-09-15 02:44:51 C 02 13 07.79 -24 04 20.0 z 859
1999-09-15 02:47:43 C 02 13 09.12 -24 04 12.0 z 859
1999-09-15 02:51:50 C 02 13 11.00 -24 04 00.8 z 859
1999-09-15 02:54:54 C 02 13 12.45 -24 03 52.4 z 859
1999-09-15 02:58:01 C 02 13 13.90 -24 03 43.6 z 859
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)