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
2018-03-20 21:54:44 n 12 22 16.84 +04 10 00.9 16.0 U Z43
2018-03-20 22:25:13 n 12 22 15.34 +04 10 32.3 16.1 U Z43
2018-03-22 07:35:08 C 12 20 38.32 +04 45 50.7 U 703
2018-03-22 07:42:40 C 12 20 37.90 +04 45 59.3 U 703
2018-03-22 07:50:12 C 12 20 37.50 +04 46 07.3 U 703
2018-03-22 07:57:44 C 12 20 37.11 +04 46 15.9 U 703
2018-03-23 14:40:17 C 12 19 02.98 +05 20 07.0 q Q11
2018-03-23 14:48:33 C 12 19 02.52 +05 20 16.2 q Q11
2018-03-23 14:56:47 C 12 19 02.06 +05 20 25.3 q Q11
2018-03-24 00:33:33 C 12 18 31.38 +05 31 14.0 q 160
2018-03-24 00:35:31 C 12 18 31.27 +05 31 16.1 q 160
2018-03-24 00:37:27 C 12 18 31.17 +05 31 18.4 q 160
2018-03-24 23:38:22 C 12 17 16.72 +05 57 43.3 Q 160
2018-03-24 23:40:13 C 12 17 16.61 +05 57 45.1 Q 160
2018-03-24 23:41:58 C 12 17 16.54 +05 57 47.1 Q 160
2018-03-25 00:32:15 C 12 17 13.87 +05 58 48.5 17.2 q J43
2018-03-25 00:44:54 C 12 17 13.12 +05 59 03.4 17.2 q J43
2018-03-25 00:57:38 C 12 17 12.37 +05 59 18.1 17.2 q J43
2018-03-25 01:10:16 C 12 17 11.62 +05 59 32.7 17.2 q J43
2018-03-26 00:49:58 C 12 15 52.03 +06 27 20.9 q 160
2018-03-26 00:51:59 C 12 15 51.91 +06 27 22.9 q 160
2018-03-26 00:54:03 C 12 15 51.79 +06 27 25.4 q 160
2018-03-27 07:19:20 C 12 14 06.28 +07 04 14.6 U 703
2018-03-27 07:27:18 C 12 14 05.79 +07 04 24.3 U 703
2018-03-27 07:35:16 C 12 14 05.25 +07 04 33.9 U 703
2018-03-27 07:43:14 C 12 14 04.79 +07 04 44.0 U 703
2018-04-01 19:24:47 C 12 05 41.54 +09 55 39.0 q 107
2018-04-01 19:31:18 C 12 05 41.05 +09 55 48.0 q 107
2018-04-01 19:39:29 C 12 05 40.46 +09 55 59.3 q 107
2018-04-04 07:53:33 C 12 01 26.13 +11 19 59.3 q H15
2018-04-04 08:02:40 C 12 01 25.43 +11 20 12.2 q H15
2018-04-04 08:13:38 C 12 01 24.59 +11 20 27.4 q H15
2018-04-04 21:12:46 C 12 00 28.71 +11 38 54.5 o L52
2018-04-05 10:28:38 C 11 59 30.44 +11 58 05.4 U T08
2018-04-05 10:37:50 C 11 59 29.70 +11 58 18.7 U T08
2018-04-05 10:45:33 C 11 59 29.10 +11 58 29.6 U T08
2018-04-05 11:01:14 C 11 59 27.88 +11 58 52.2 U T08
2018-04-05 11:10:39 C 11 59 27.14 +11 59 06.6 U T08
2018-04-05 11:18:28 C 11 59 26.51 +11 59 16.9 U T08
2018-04-06 07:16:25 C 11 57 58.29 +12 28 09.6 U 703
2018-04-06 07:24:42 C 11 57 57.63 +12 28 21.6 U 703
2018-04-06 07:32:58 C 11 57 56.98 +12 28 33.7 U 703
2018-04-06 07:41:16 C 11 57 56.33 +12 28 45.6 U 703
2018-04-06 22:34:12 C 11 56 49.82 +12 50 27.8 q 160
2018-04-06 22:36:02 C 11 56 49.64 +12 50 30.6 q 160
2018-04-06 22:37:52 C 11 56 49.48 +12 50 33.2 q 160
2018-04-08 19:50:53 C 11 53 23.20 +13 57 32.9 q 046
2018-04-08 19:52:04 C 11 53 23.12 +13 57 33.9 q 046
2018-04-08 19:52:52 C 11 53 23.06 +13 57 35.6 q 046
2018-04-08 19:53:39 C 11 53 22.98 +13 57 36.8 q 046
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)