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
2008-04-27 10:33:02 C 21 30 44.53 +08 56 02.6 r 703
2008-04-27 10:38:34 C 21 30 46.29 +08 56 08.4 r 703
2008-04-27 10:44:06 C 21 30 48.02 +08 56 12.6 r 703
2008-04-27 10:49:37 C 21 30 49.71 +08 56 19.3 r 703
2008-05-06 10:59:12 C 22 32 55.14 +11 53 38.0 r 703
2008-05-06 11:02:56 C 22 32 56.11 +11 53 40.8 r 703
2008-05-06 11:06:42 C 22 32 57.04 +11 53 43.3 r 703
2008-05-06 11:10:25 C 22 32 58.09 +11 53 45.0 r 703
2008-08-03 09:35:31 C 03 40 25.57 +16 08 52.1 19.6 c 704
2008-08-03 09:51:03 C 03 40 26.59 +16 08 49.2 19.7 c 704
2008-08-03 10:06:33 C 03 40 27.70 +16 08 47.2 19.8 c 704
2008-08-03 10:22:02 C 03 40 28.80 +16 08 44.7 19.4 c 704
2008-09-23 09:44:28 C 04 17 48.58 +09 47 56.0 19.4 c 704
2008-09-23 10:01:33 C 04 17 48.22 +09 47 48.0 19.6 c 704
2008-09-23 10:18:41 C 04 17 47.87 +09 47 41.2 19.6 c 704
2008-09-23 10:35:55 C 04 17 47.59 +09 47 31.9 19.9 c 704
2008-09-23 10:53:04 C 04 17 47.26 +09 47 25.8 19.4 c 704
2008-09-29 10:34:58 C 04 14 22.23 +08 42 24.3 r 703
2008-09-29 10:50:33 C 04 14 21.69 +08 42 16.7 r 703
2008-09-29 11:06:18 C 04 14 21.22 +08 42 10.1 r 703
2008-09-30 08:22:02 C 04 13 42.32 +08 32 20.1 19.7 c 704
2008-09-30 08:39:46 C 04 13 41.69 +08 32 12.8 19.8 c 704
2008-09-30 08:57:43 C 04 13 41.10 +08 32 04.1 20.1 c 704
2008-09-30 09:15:30 C 04 13 40.57 +08 31 55.7 19.8 c 704
2008-09-30 09:33:28 C 04 13 39.97 +08 31 47.3 19.7 c 704
2008-10-05 00:13:04 C 04 09 40.59 +07 40 07.9 r 106
2008-10-05 00:26:55 C 04 09 39.97 +07 40 01.1 r 106
2008-10-05 00:40:46 C 04 09 39.40 +07 39 53.7 r 106
2008-10-05 00:54:37 C 04 09 38.81 +07 39 48.3 r 106
2008-10-09 11:42:38 C 04 04 54.55 +06 49 42.2 r 703
2008-10-09 11:50:35 C 04 04 54.19 +06 49 38.6 r 703
2008-10-09 11:58:37 C 04 04 53.79 +06 49 35.0 r 703
2008-10-09 12:06:39 C 04 04 53.43 +06 49 31.0 r 703
2008-10-20 08:15:19 C 03 50 23.65 +04 51 08.3 r 683
2008-10-20 08:34:36 C 03 50 22.42 +04 50 57.7 r 683
2008-10-20 08:53:54 C 03 50 21.15 +04 50 50.1 r 683
2008-10-21 08:09:54 C 03 48 53.76 +04 40 49.8 r 683
2008-10-21 08:29:10 C 03 48 52.50 +04 40 42.8 r 683
2008-10-24 07:34:26 C 03 44 18.40 +04 10 55.9 19.0 c 704
2008-10-24 07:50:59 C 03 44 17.26 +04 10 48.8 19.3 c 704
2008-10-24 08:07:28 C 03 44 16.16 +04 10 41.8 19.4 c 704
2008-10-24 08:23:57 C 03 44 15.02 +04 10 36.1 19.3 c 704
2008-10-24 08:40:31 C 03 44 13.94 +04 10 28.6 19.4 c 704
2008-10-25 07:18:24 C 03 42 44.93 +04 01 18.5 18.8 c 704
2008-10-25 07:34:54 C 03 42 43.84 +04 01 12.2 18.6 c 704
2008-10-25 07:51:45 C 03 42 42.77 +04 01 06.2 19.4 c 704
2008-10-25 08:08:15 C 03 42 41.53 +04 00 58.7 18.6 c 704
2008-10-25 08:24:46 C 03 42 40.44 +04 00 51.8 18.8 c 704
2008-11-03 07:50:56 C 03 28 12.36 +02 43 09.3 r 703
2008-11-03 07:58:48 C 03 28 11.85 +02 43 07.5 r 703
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)