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
2000-03-30 09:29:47 C 14 23 56.09 -21 26 44.4 695
2000-03-30 09:33:58 C 14 23 55.56 -21 26 45.8 695
2000-03-30 09:56:09 C 14 23 52.85 -21 26 53.5 695
2000-03-30 10:00:12 C 14 23 52.33 -21 26 54.8 695
2000-03-30 10:03:50 C 14 23 51.91 -21 26 56.1 695
2000-03-30 10:07:26 C 14 23 51.48 -21 26 57.3 695
2000-03-30 10:11:19 C 14 23 50.99 -21 26 58.7 695
2000-03-30 10:31:09 C 14 23 48.56 -21 27 05.4 695
2000-03-30 10:34:26 C 14 23 48.16 -21 27 06.5 695
2000-04-06 05:47:28 C 14 03 45.60 -22 09 14.8 b 709
2000-04-06 05:50:21 C 14 03 45.21 -22 09 15.9 b 709
2000-04-06 05:52:22 C 14 03 44.85 -22 09 16.3 b 709
2000-04-06 05:55:23 C 14 03 44.49 -22 09 16.8 b 709
2000-04-06 05:58:24 C 14 03 44.12 -22 09 17.0 b 709
2000-04-06 06:00:25 C 14 03 43.79 -22 09 17.8 b 709
2000-04-06 06:03:27 C 14 03 43.38 -22 09 18.2 b 709
2000-04-06 06:06:28 C 14 03 43.02 -22 09 18.8 b 709
2005-06-30 12:22:30 C 23 07 50.67 -25 02 12.4 c F65
2005-06-30 12:24:10 C 23 07 50.82 -25 02 12.5 c F65
2005-06-30 12:25:45 C 23 07 50.94 -25 02 12.0 c F65
2005-06-30 12:27:20 C 23 07 51.13 -25 02 11.2 c F65
2005-08-08 15:59:25 C 00 30 23.61 -24 27 34.0 r E12
2005-08-08 16:18:27 C 00 30 25.20 -24 27 33.1 r E12
2005-08-08 16:36:47 C 00 30 26.67 -24 27 31.9 r E12
2005-08-08 16:55:20 C 00 30 28.11 -24 27 30.5 r E12
2005-08-15 16:40:14 C 00 46 50.49 -24 07 28.8 r 428
2005-08-15 16:43:50 C 00 46 50.81 -24 07 28.1 r 428
2005-08-15 16:47:26 C 00 46 51.13 -24 07 27.5 r 428
2005-08-27 18:20:18 C 01 23 10.21 -22 16 32.7 r E12
2005-08-27 18:36:08 C 01 23 12.33 -22 16 21.3 r E12
2005-08-27 18:52:23 C 01 23 14.60 -22 16 09.4 r E12
2005-08-27 19:08:19 C 01 23 16.76 -22 15 57.3 r E12
2005-09-04 01:28:19 C 01 57 36.98 -19 11 17.8 r 157
2005-09-04 01:29:49 C 01 57 37.31 -19 11 14.9 r 157
2005-09-04 01:31:20 C 01 57 37.67 -19 11 13.0 r 157
2005-09-04 01:32:50 C 01 57 37.95 -19 11 09.7 r 157
2005-09-10 00:03:59 C 02 43 14.88 -13 29 59.4 r 084
2005-09-10 00:05:26 C 02 43 15.45 -13 29 53.5 r 084
2005-09-12 13:57:12 C 03 12 19.17 -09 11 06.5 c 608
2005-09-12 14:12:48 C 03 12 26.70 -09 09 49.5 c 608
2005-09-12 15:11:57 C 03 12 55.18 -09 04 55.1 c 608
2005-09-13 08:50:34 C 03 22 54.51 -07 33 16.2 r 703
2005-09-13 09:03:34 C 03 23 01.46 -07 32 05.6 r 703
2005-09-13 09:16:30 C 03 23 08.41 -07 30 55.2 r 703
2005-09-13 09:29:25 C 03 23 15.32 -07 29 45.0 r 703
2005-09-14 17:34:05 C 03 43 07.43 -04 17 42.7 r 379
2005-09-14 17:37:43 C 03 43 09.67 -04 17 19.4 r 379
2005-09-14 17:38:55 C 03 43 10.41 -04 17 11.4 r 379
2005-09-14 17:40:07 C 03 43 11.15 -04 17 03.8 r 379
2005-09-14 17:43:27 C 03 43 13.19 -04 16 42.4 r 379
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)