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
2018-04-08 19:54:27 C 11 53 22.94 +13 57 37.9 q 046
2018-04-08 19:55:32 C 11 53 22.86 +13 57 39.3 q 046
2018-04-08 19:56:20 C 11 53 22.78 +13 57 40.4 q 046
2018-04-08 19:57:10 C 11 53 22.70 +13 57 41.8 q 046
2018-04-08 19:58:00 C 11 53 22.59 +13 57 43.0 q 046
2018-04-08 19:58:46 C 11 53 22.55 +13 57 44.6 q 046
2018-04-10 06:52:03 C 11 50 38.78 +14 50 20.4 U 703
2018-04-10 06:59:36 C 11 50 38.16 +14 50 31.8 U 703
2018-04-10 07:07:07 C 11 50 37.52 +14 50 43.1 U 703
2018-04-10 07:14:39 C 11 50 36.89 +14 50 54.6 U 703
2018-04-11 06:16:49 C 11 48 47.97 +15 25 54.8 U G96
2018-04-11 06:25:00 C 11 48 47.28 +15 26 07.3 U G96
2018-04-11 06:33:10 C 11 48 46.59 +15 26 19.6 U G96
2018-04-11 06:41:19 C 11 48 45.91 +15 26 31.9 U G96
2018-04-11 13:38:53 C 11 48 13.24 +15 37 09.1 q D29
2018-04-11 14:04:20 C 11 48 11.09 +15 37 48.0 q D29
2018-04-11 14:29:48 C 11 48 08.93 +15 38 27.0 q D29
2018-04-12 02:40:05 C 11 47 10.99 +15 57 03.2 U W34
2018-04-12 03:13:33 C 11 47 08.15 +15 57 54.6 U W34
2018-04-12 03:34:24 C 11 47 06.36 +15 58 26.6 U W34
2018-04-13 06:51:33 C 11 44 54.34 +16 40 23.3 U 703
2018-04-13 06:59:41 C 11 44 53.65 +16 40 35.8 U 703
2018-04-13 07:15:58 C 11 44 52.21 +16 41 01.6 U 703
2018-04-13 10:50:38 C 11 44 34.68 +16 46 35.8 U T08
2018-04-13 10:53:36 C 11 44 34.42 +16 46 40.3 U T08
2018-04-13 11:06:44 C 11 44 33.29 +16 47 00.6 U T08
2018-04-13 11:09:37 C 11 44 33.04 +16 47 04.9 U T08
2018-04-13 11:22:27 C 11 44 31.94 +16 47 24.5 U T08
2018-04-13 11:25:10 C 11 44 31.71 +16 47 28.6 U T08
2018-04-13 11:38:44 C 11 44 30.56 +16 47 49.6 U T08
2018-04-13 11:41:31 C 11 44 30.32 +16 47 53.6 U T08
2018-04-16 07:03:44 C 11 39 01.70 +18 32 13.2 U 703
2018-04-16 07:11:21 C 11 39 01.06 +18 32 24.3 U 703
2018-04-16 07:26:36 C 11 38 59.69 +18 32 48.4 U 703
2018-04-18 16:19:37 C 11 34 20.89 +20 01 22.4 q C97
2018-04-18 16:23:22 C 11 34 20.73 +20 01 26.7 q C97
2018-04-18 16:25:38 C 11 34 20.48 +20 01 30.4 q C97
2018-04-18 16:27:52 C 11 34 20.36 +20 01 33.5 q C97
2018-04-18 21:45:01 C 11 33 53.53 +20 09 39.6 q 160
2018-04-18 21:47:18 C 11 33 53.33 +20 09 43.4 q 160
2018-04-18 21:49:36 C 11 33 53.14 +20 09 47.3 q 160
2018-04-19 10:00:55 C 11 32 52.68 +20 28 52.0 U T05
2018-04-19 10:17:04 C 11 32 51.27 +20 29 16.8 U T05
2018-04-19 10:33:13 C 11 32 49.85 +20 29 41.6 U T05
2018-04-19 10:42:08 C 11 32 49.07 +20 29 55.3 U T05
2018-04-19 17:59:47 C 11 32 14.52 +20 41 07.2 o L52
2018-04-19 18:06:20 C 11 32 13.92 +20 41 17.8 o L52
2018-04-19 22:20:13 C 11 31 52.34 +20 47 52.7 q 160
2018-04-19 22:22:20 C 11 31 52.16 +20 47 55.9 q 160
2018-04-19 22:24:19 C 11 31 51.98 +20 47 59.0 q 160
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)