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
2018-04-20 06:13:24 C 11 31 13.55 +21 00 12.1 U 703
2018-04-20 06:21:02 C 11 31 12.90 +21 00 23.8 U 703
2018-04-20 06:28:40 C 11 31 12.23 +21 00 35.6 U 703
2018-04-20 06:36:17 C 11 31 11.56 +21 00 47.3 U 703
2018-04-20 14:28:01 C 11 30 33.22 +21 13 00.0 q D29
2018-04-20 14:53:28 C 11 30 30.99 +21 13 39.3 q D29
2018-04-20 15:18:56 C 11 30 28.77 +21 14 18.6 q D29
2018-04-20 15:44:42 C 11 30 26.52 +21 14 58.2 q D29
2018-04-20 16:10:10 C 11 30 24.31 +21 15 37.3 q D29
2018-04-20 16:35:36 C 11 30 22.12 +21 16 16.2 q D29
2018-04-20 22:40:48 C 11 29 52.62 +21 25 39.7 q 160
2018-04-20 22:42:54 C 11 29 52.43 +21 25 42.9 q 160
2018-04-20 22:45:00 C 11 29 52.25 +21 25 46.2 q 160
2018-04-22 20:39:58 C 11 26 08.32 +22 36 49.6 q 160
2018-04-22 20:42:03 C 11 26 08.14 +22 36 53.6 q 160
2018-04-22 20:44:10 C 11 26 07.96 +22 36 56.7 q 160
2018-04-23 03:44:13 C 11 25 34.27 +22 47 48.2 U 703
2018-04-23 03:51:53 C 11 25 33.61 +22 48 00.0 U 703
2018-04-23 04:07:13 C 11 25 32.28 +22 48 23.7 U 703
2018-04-23 09:13:34 C 11 25 06.65 +22 56 19.9 U T05
2018-04-23 09:27:34 C 11 25 05.44 +22 56 41.3 U T05
2018-04-23 09:56:49 C 11 25 02.90 +22 57 25.8 U T05
2018-04-23 20:39:38 C 11 24 11.73 +23 13 47.7 q 160
2018-04-23 20:41:53 C 11 24 11.55 +23 13 51.0 q 160
2018-04-23 20:44:05 C 11 24 11.34 +23 13 54.4 q 160
2018-04-24 20:28:40 C 11 22 16.73 +23 50 22.2 q 160
2018-04-24 20:30:41 C 11 22 16.56 +23 50 25.2 q 160
2018-04-24 20:32:43 C 11 22 16.39 +23 50 28.2 q 160
2018-04-25 22:19:04 C 11 20 12.21 +24 29 53.8 q 160
2018-04-25 22:21:18 C 11 20 12.05 +24 29 57.9 q 160
2018-04-25 22:23:31 C 11 20 11.89 +24 30 00.7 q 160
2018-04-26 21:48:23 C 11 18 20.32 +25 05 39.5 q 160
2018-04-26 21:50:30 C 11 18 20.11 +25 05 42.7 q 160
2018-04-26 21:52:29 C 11 18 19.96 +25 05 45.3 q 160
2018-04-29 20:16:38 C 11 12 50.14 +26 52 04.0 U K87
2018-04-29 20:24:12 C 11 12 49.52 +26 52 15.3 U K87
2018-04-29 20:31:47 C 11 12 48.90 +26 52 26.7 U K87
2018-04-30 14:40:46 C 11 11 24.26 +27 19 41.9 r P93
2018-04-30 14:42:15 C 11 11 24.12 +27 19 44.2 r P93
2018-04-30 14:44:14 C 11 11 23.96 +27 19 47.2 r P93
2018-05-02 16:49:54 C 11 07 36.59 +28 34 32.6 q C97
2018-05-02 16:53:08 C 11 07 36.31 +28 34 37.1 q C97
2018-05-02 16:55:32 C 11 07 36.17 +28 34 40.6 q C97
2018-05-02 16:57:55 C 11 07 35.95 +28 34 44.3 q C97
2018-05-04 05:53:18 C 11 04 49.73 +29 29 16.0 U 703
2018-05-04 05:58:42 S 11 04 50.64 +29 29 25.3 L C51
2018-05-04 06:00:54 C 11 04 49.13 +29 29 27.0 U 703
2018-05-04 06:08:30 C 11 04 48.50 +29 29 38.0 U 703
2018-05-04 06:16:05 C 11 04 47.90 +29 29 49.1 U 703
2018-05-04 09:07:12 S 11 04 36.65 +29 34 03.4 L C51
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)