9856 (1991 EE)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.6257509426 ± 7.34e-09
Semi-major axis (a)2.2428520810 AU ± 9.38e-10
Inclination (i)9.82869445° ± 3.18e-06
Long. of Asc. Node (Ω)168.09783490° ± 1.15e-05
Arg. of Perihelion (ω)116.19754724° ± 1.16e-05
Mean Anomaly (M)72.00292090° ± 1.73e-06
Mean Motion (n)0.2934346040°/day ± 1.84e-10
Perihelion dist (q)0.83938528 AU ± 1.65e-08
Aphelion dist (Q)3.64631888 AU ± 1.65e-08
Orbital Period3.35892996 yr ± 2.11e-09
Physical Parameters
H (abs. magnitude)17.08
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.450″
Uncertainty0
Orbit TypeApollo
MOID0.021767 AU
Observations Used1349
Radar Obs Used4
Oppositions1
Arc Total1991-2026
First Observation Used1991-03-13
Last Observation Used2026-02-04
Observations (1824)
Date Type RA Dec Mag Band Observatory
2008-11-03 08:06:22 C 03 28 11.28 +02 43 05.8 r 703
2008-11-03 08:14:09 C 03 28 10.74 +02 43 03.0 r 703
2008-11-19 05:18:14 C 03 04 31.26 +01 18 12.4 r 703
2008-11-19 05:31:19 C 03 04 30.50 +01 18 09.5 r 703
2008-11-19 05:44:14 C 03 04 29.78 +01 18 08.4 r 703
2008-11-19 05:57:15 C 03 04 29.02 +01 18 05.6 r 703
2008-11-27 21:23:30 C 02 54 23.60 +01 02 31.5 r J75
2008-11-27 21:43:41 C 02 54 22.60 +01 02 30.6 r J75
2008-11-27 22:03:25 C 02 54 21.77 +01 02 29.8 r J75
2011-01-27 06:02:08 C 10 05 09.35 +04 42 43.6 o 691
2011-01-27 06:22:05 C 10 05 08.60 +04 42 48.1 o 691
2011-01-27 06:41:56 C 10 05 07.81 +04 42 52.2 o 691
2011-02-04 10:45:54 C 09 56 48.173 +05 35 07.51 L F51
2011-02-04 11:06:29 C 09 56 47.193 +05 35 13.60 L F51
2011-02-04 11:27:10 C 09 56 46.199 +05 35 20.07 L F51
2011-02-05 10:27:33 C 09 55 41.705 +05 42 18.53 L F51
2011-02-05 11:10:13 C 09 55 39.637 +05 42 31.75 L F51
2011-02-05 11:30:50 C 09 55 38.636 +05 42 38.08 L F51
2011-02-11 07:42:59 C 09 48 43.12 +06 28 36.6 r G96
2011-02-11 07:51:22 C 09 48 42.73 +06 28 39.6 r G96
2011-02-11 07:59:45 C 09 48 42.22 +06 28 42.6 r G96
2011-02-11 08:09:08 C 09 48 41.74 +06 28 46.5 o H15
2011-02-11 08:28:35 C 09 48 40.73 +06 28 52.6 o H15
2011-02-11 08:48:00 C 09 48 39.73 +06 28 58.7 o H15
2011-02-11 09:07:22 C 09 48 38.72 +06 29 04.8 o H15
2011-03-02 06:27:37 C 09 24 21.34 +09 23 55.4 r G96
2011-03-02 06:35:59 C 09 24 20.91 +09 23 58.8 r G96
2011-03-02 06:44:22 C 09 24 20.44 +09 24 01.9 r G96
2011-03-02 06:52:43 C 09 24 19.98 +09 24 05.4 r G96
2011-03-29 04:20:51 C 08 58 27.01 +13 16 25.1 r G96
2011-03-29 04:28:16 C 08 58 26.83 +13 16 27.4 r G96
2011-03-29 04:35:41 C 08 58 26.65 +13 16 29.6 r G96
2011-05-31 07:31:12 C 09 27 41.42 +15 17 52.3 t 568
2011-05-31 07:38:40 C 09 27 41.82 +15 17 51.3 t 568
2011-05-31 07:46:24 C 09 27 42.25 +15 17 50.4 t 568
2011-06-01 07:36:27 C 09 29 01.59 +15 14 55.1 t 568
2011-06-01 07:44:00 C 09 29 02.01 +15 14 54.1 t 568
2015-10-18 09:46:15 C 05 31 23.91 +10 29 31.4 u H21
2015-10-18 09:54:43 C 05 31 23.74 +10 29 29.5 u H21
2015-10-18 10:03:50 C 05 31 23.56 +10 29 27.6 u H21
2015-10-18 10:12:50 C 05 31 23.39 +10 29 25.4 u H21
2015-10-23 12:22:56 C 05 28 39.078 +10 03 17.49 L F51
2015-10-23 12:41:35 C 05 28 38.581 +10 03 13.70 L F51
2015-10-23 13:00:08 C 05 28 38.082 +10 03 09.67 L F51
2015-11-18 10:40:56 C 05 03 46.354 +08 04 49.24 L F51
2015-11-18 10:58:18 C 05 03 45.448 +08 04 46.47 L F51
2015-11-18 11:15:44 C 05 03 44.547 +08 04 43.90 L F51
2015-11-18 11:39:47 C 05 03 43.289 +08 04 40.23 L F51
2015-12-02 10:01:46 C 04 46 04.383 +07 24 25.81 L F51
2015-12-02 10:19:56 C 04 46 03.385 +07 24 24.49 L F51
Radar Observations (8)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
1991-09-04 21:43:00 108192.3 1 Hz 2380 -1 -1
1991-09-04 22:36:00 59429989.3 2 us 2380 -1 -1
1991-09-04 22:50:00 59392933.7 0.4 us 2380 -1 -1
1991-09-04.904861 10819230 100 Hz 2380 251 251
1991-09-04.941667 5942998930 2000 us 2380 251 251
1991-09-04.951389 5939293370 400 us 2380 251 251
1991-09-05 22:08:00 56320461 4 us 2380 -1 -1
1991-09-05.922222 5632046100 4000 us 2380 251 251
Station codes
-1 Arecibo (305-m, 1963–2020)