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
2018-05-18 08:04:01 C 10 40 36.96 +37 48 15.0 U T05
2018-05-18 08:23:58 C 10 40 35.38 +37 48 44.4 U T05
2018-05-18 08:28:54 C 10 40 34.97 +37 48 51.8 U T05
2018-05-18 08:49:36 C 10 40 33.32 +37 49 22.5 U T05
2018-05-19 04:40:02 C 10 39 06.39 +38 19 39.2 U 703
2018-05-19 04:48:19 C 10 39 05.75 +38 19 51.7 U 703
2018-05-19 04:56:34 C 10 39 05.03 +38 20 02.6 U 703
2018-05-19 05:04:50 C 10 39 04.40 +38 20 15.4 U 703
2018-05-22 07:17:42 C 10 33 22.93 +40 16 19.8 U T05
2018-05-22 07:32:35 C 10 33 21.61 +40 16 42.7 U T05
2018-05-22 07:48:31 C 10 33 20.21 +40 17 07.7 U T05
2018-05-22 08:05:01 C 10 33 18.78 +40 17 32.9 U T05
2018-05-25 04:11:37 C 10 27 34.80 +42 08 28.2 U 703
2018-05-25 04:19:35 C 10 27 34.06 +42 08 41.4 U 703
2018-05-25 04:27:32 C 10 27 33.30 +42 08 54.1 U 703
2018-05-25 04:35:29 C 10 27 32.53 +42 09 06.8 U 703
2018-05-31 12:24:05 C 10 11 26.52 +46 36 48.2 q D29
2018-05-31 12:44:27 C 10 11 23.75 +46 37 25.0 q D29
2018-05-31 13:04:48 C 10 11 20.98 +46 38 01.7 q D29
2018-06-01 06:18:38 C 10 09 05.35 +47 10 32.2 U T08
2018-06-01 06:32:53 C 10 09 03.26 +47 10 58.4 U T08
2018-06-01 06:50:20 C 10 09 00.84 +47 11 30.4 U T08
2018-06-01 06:56:22 C 10 08 59.89 +47 11 41.1 U T08
2018-06-02 04:12:13 C 10 06 02.07 +47 52 03.5 U 703
2018-06-02 04:19:53 C 10 06 00.86 +47 52 18.9 U 703
2018-06-02 04:35:13 C 10 05 58.44 +47 52 45.7 U 703
2018-06-03 06:32:37 C 10 02 05.11 +48 43 08.8 U T05
2018-06-03 07:06:44 C 10 01 59.46 +48 44 13.1 U T05
2018-06-03 07:20:17 C 10 01 57.22 +48 44 38.5 U T05
2018-06-04 03:49:55 C 09 58 38.56 +49 24 49.8 U G96
2018-06-04 03:58:10 C 09 58 37.14 +49 25 05.4 U G96
2018-06-04 04:06:24 C 09 58 35.68 +49 25 21.1 U G96
2018-06-04 04:14:38 C 09 58 34.24 +49 25 36.8 U G96
2018-06-05 06:35:40 C 09 53 57.55 +50 18 10.5 U T08
2018-06-05 06:49:21 C 09 53 54.90 +50 18 36.8 U T08
2018-06-05 07:00:46 C 09 53 52.71 +50 18 58.6 U T08
2018-06-05 07:14:54 C 09 53 50.02 +50 19 25.8 U T08
2018-06-09 06:33:18 C 09 33 11.50 +53 32 52.8 U T08
2018-06-09 06:56:16 C 09 33 05.46 +53 33 36.9 U T08
2018-06-09 07:08:22 C 09 33 02.32 +53 34 00.7 U T08
2018-06-09 07:20:31 C 09 32 59.08 +53 34 23.5 U T08
2018-06-11 06:27:38 C 09 19 54.52 +55 09 31.2 U T05
2018-06-11 06:41:56 C 09 19 50.07 +55 09 58.3 U T05
2018-06-11 06:56:04 C 09 19 45.72 +55 10 25.0 U T05
2018-06-11 07:10:19 C 09 19 41.35 +55 10 51.5 U T05
2018-06-13 06:36:09 C 09 04 07.39 +56 42 59.4 U T08
2018-06-13 06:50:24 C 09 04 02.23 +56 43 24.9 U T08
2018-06-13 07:02:33 C 09 03 57.86 +56 43 46.3 U T08
2018-06-13 07:14:37 C 09 03 53.47 +56 44 07.2 U T08
2018-06-15 06:20:09 C 08 45 44.44 +58 08 33.4 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)