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
2018-05-04 12:15:42 S 11 04 22.69 +29 38 41.3 L C51
2018-05-04 13:49:57 S 11 04 15.71 +29 41 00.5 L C51
2018-05-04 15:24:12 S 11 04 08.75 +29 43 19.3 L C51
2018-05-04 16:58:28 S 11 04 01.79 +29 45 38.1 L C51
2018-05-04 20:06:46 S 11 03 47.88 +29 50 16.0 L C51
2018-05-04 20:06:57 S 11 03 47.84 +29 50 15.6 L C51
2018-05-05 08:55:26 C 11 02 49.87 +30 09 10.0 U T05
2018-05-05 09:12:29 C 11 02 48.51 +30 09 34.4 U T05
2018-05-05 09:28:35 C 11 02 47.24 +30 09 57.6 U T05
2018-05-05 21:20:32 C 11 01 55.67 +30 27 12.9 U G34
2018-05-05 21:22:16 C 11 01 55.54 +30 27 15.5 U G34
2018-05-05 21:24:03 C 11 01 55.41 +30 27 18.1 U G34
2018-05-05 21:25:47 C 11 01 55.29 +30 27 20.4 U G34
2018-05-07 04:20:17 C 10 59 40.70 +31 12 49.0 U G96
2018-05-07 04:27:41 C 10 59 40.12 +31 12 59.7 U G96
2018-05-07 04:35:04 C 10 59 39.52 +31 13 10.4 U G96
2018-05-07 04:42:29 C 10 59 38.93 +31 13 21.1 U G96
2018-05-08 16:32:17 C 10 57 04.66 +32 05 52.3 q C97
2018-05-08 16:34:48 C 10 57 04.41 +32 05 55.3 q C97
2018-05-08 16:37:12 C 10 57 04.25 +32 05 58.9 q C97
2018-05-08 16:39:36 C 10 57 04.00 +32 06 02.6 q C97
2018-05-10 05:36:16 C 10 54 25.47 +32 59 56.4 U 703
2018-05-10 05:44:28 C 10 54 24.84 +33 00 08.1 U 703
2018-05-10 05:52:40 C 10 54 24.21 +33 00 19.8 U 703
2018-05-10 06:00:51 C 10 54 23.59 +33 00 31.5 U 703
2018-05-13 08:35:26 C 10 49 07.75 +34 49 56.0 U T05
2018-05-13 08:50:58 C 10 49 06.55 +34 50 18.2 U T05
2018-05-13 09:06:36 C 10 49 05.36 +34 50 40.5 U T05
2018-05-13 09:22:05 C 10 49 04.19 +34 51 02.5 U T05
2018-05-14 05:40:48 C 10 47 38.68 +35 20 56.1 U 703
2018-05-14 05:49:01 C 10 47 38.04 +35 21 08.2 U 703
2018-05-14 05:57:14 C 10 47 37.41 +35 21 20.1 U 703
2018-05-14 06:05:28 C 10 47 36.79 +35 21 31.7 U 703
2018-05-14 19:29:57 C 10 46 40.49 +35 41 17.5 o L52
2018-05-14 19:36:27 C 10 46 40.02 +35 41 28.3 o L52
2018-05-15 08:06:45 C 10 45 46.65 +36 00 12.2 U T08
2018-05-15 08:20:30 C 10 45 45.58 +36 00 32.2 U T08
2018-05-15 08:36:19 C 10 45 44.34 +36 00 55.0 U T08
2018-05-15 08:51:51 C 10 45 43.16 +36 01 17.4 U T08
2018-05-16 07:50:04 C 10 44 05.65 +36 35 34.2 U T08
2018-05-16 08:02:50 C 10 44 04.63 +36 35 52.7 U T08
2018-05-16 08:17:00 C 10 44 03.52 +36 36 13.4 U T08
2018-05-16 08:32:13 C 10 44 02.32 +36 36 35.5 U T08
2018-05-17 08:26:54 C 10 42 19.56 +37 12 29.0 U T05
2018-05-17 08:42:49 C 10 42 18.30 +37 12 52.2 U T05
2018-05-17 08:58:40 C 10 42 17.07 +37 13 15.2 U T05
2018-05-17 09:14:49 C 10 42 15.82 +37 13 38.9 U T05
2018-05-18 07:52:33 C 10 40 37.89 +37 47 58.3 U T05
2018-05-18 07:55:11 C 10 40 37.68 +37 48 02.0 U T05
2018-05-18 08:02:43 C 10 40 37.09 +37 48 13.1 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)