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
2018-09-12 10:51:14 C 03 35 12.42 +09 36 47.3 703
2018-09-15 09:40:07 C 03 31 47.05 +08 28 42.2 V 703
2018-09-15 09:47:45 C 03 31 46.61 +08 28 35.0 V 703
2018-09-15 09:55:22 C 03 31 46.19 +08 28 27.5 V 703
2018-09-15 10:02:59 C 03 31 45.74 +08 28 20.5 V 703
2018-09-15 14:39:42 C 03 31 31.01 +08 23 59.2 U T08
2018-09-15 14:48:07 C 03 31 30.53 +08 23 51.3 U T08
2018-09-15 14:54:22 C 03 31 30.18 +08 23 45.4 U T08
2018-09-15 15:02:45 C 03 31 29.70 +08 23 37.1 U T08
2018-09-15 15:09:03 C 03 31 29.33 +08 23 31.1 U T08
2018-09-15 15:17:31 C 03 31 28.88 +08 23 23.0 U T08
2018-09-15 15:23:38 C 03 31 28.50 +08 23 17.0 U T08
2018-09-17 14:38:30 C 03 28 55.23 +07 38 12.4 U T05
2018-09-17 14:53:05 C 03 28 54.35 +07 37 58.7 U T05
2018-09-17 15:07:44 C 03 28 53.46 +07 37 44.7 U T05
2018-09-17 15:22:27 C 03 28 52.57 +07 37 30.7 U T05
2018-09-18 08:59:03 C 03 27 53.23 +07 20 44.4 V 703
2018-09-18 09:06:35 C 03 27 52.75 +07 20 37.3 V 703
2018-09-18 09:14:08 C 03 27 52.28 +07 20 30.2 V 703
2018-09-18 09:21:41 C 03 27 51.83 +07 20 23.0 V 703
2018-09-18 14:39:32 C 03 27 32.82 +07 15 25.5 U T05
2018-09-18 14:57:44 C 03 27 31.67 +07 15 08.3 U T05
2018-09-18 15:14:34 C 03 27 30.62 +07 14 52.4 U T05
2018-09-18 15:31:48 C 03 27 29.47 +07 14 36.3 U T05
2018-09-19 14:34:22 C 03 26 07.91 +06 52 51.5 U T08
2018-09-19 14:48:59 C 03 26 07.01 +06 52 37.1 U T08
2018-09-19 15:03:42 C 03 26 06.02 +06 52 23.3 U T08
2018-09-19 15:18:22 C 03 26 05.06 +06 52 09.7 U T08
2018-09-21 08:27:06 C 03 23 33.38 +06 13 32.1 V 703
2018-09-21 08:35:01 C 03 23 32.82 +06 13 24.5 V 703
2018-09-21 08:42:57 C 03 23 32.31 +06 13 17.3 V 703
2018-09-21 08:50:51 C 03 23 31.77 +06 13 09.9 V 703
2018-09-21 14:09:44 C 03 23 10.92 +06 08 16.1 U T05
2018-09-21 14:24:56 C 03 23 09.87 +06 08 02.1 U T05
2018-09-21 14:40:19 C 03 23 08.82 +06 07 47.7 U T05
2018-09-21 14:55:06 C 03 23 07.82 +06 07 33.8 U T05
2018-09-23 11:48:29 C 03 20 11.93 +05 26 02.5 U T08
2018-09-23 12:00:12 C 03 20 11.12 +05 25 52.2 U T08
2018-09-23 12:11:57 C 03 20 10.27 +05 25 41.6 U T08
2018-09-23 12:23:53 C 03 20 09.40 +05 25 30.4 U T08
2018-09-24 11:45:20 C 03 18 34.14 +05 04 08.3 U T05
2018-09-24 11:59:34 C 03 18 33.18 +05 03 55.3 U T05
2018-09-24 12:13:43 C 03 18 32.10 +05 03 42.6 U T05
2018-09-24 12:17:43 C 03 18 31.82 +05 03 38.5 U T05
2018-09-24 12:27:42 C 03 18 31.08 +05 03 29.4 U T05
2018-09-24 12:31:44 C 03 18 30.79 +05 03 26.0 U T05
2018-09-24 12:45:54 C 03 18 29.76 +05 03 13.0 U T05
2018-09-25 10:20:25 C 03 17 00.18 +04 43 38.4 U T05
2018-09-25 10:41:32 C 03 16 58.61 +04 43 20.0 U T05
2018-09-25 10:51:29 C 03 16 57.83 +04 43 10.9 U T05
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)