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
2018-06-15 06:34:37 C 08 45 38.29 +58 08 55.9 U T05
2018-06-15 06:48:58 C 08 45 32.42 +58 09 18.1 U T05
2018-06-15 07:03:27 C 08 45 26.28 +58 09 41.2 U T05
2018-08-13 03:00:46 C 03 46 11.57 +21 57 43.5 q 160
2018-08-13 03:04:34 C 03 46 11.56 +21 57 39.3 q 160
2018-08-13 03:08:23 C 03 46 11.56 +21 57 34.8 q 160
2018-08-18 03:02:57 C 03 46 44.87 +19 43 44.9 q 160
2018-08-18 03:06:44 C 03 46 44.87 +19 43 40.8 q 160
2018-08-18 03:10:32 C 03 46 44.86 +19 43 36.6 q 160
2018-08-21 02:23:40 S 03 46 45.82 +18 28 05.0 L C51
2018-08-21 03:10:04 C 03 46 46.97 +18 27 09.8 q 160
2018-08-21 03:14:06 C 03 46 46.91 +18 27 05.7 q 160
2018-08-21 03:18:07 C 03 46 46.92 +18 27 01.9 q 160
2018-08-21 05:32:10 S 03 46 45.53 +18 24 48.0 L C51
2018-08-21 08:40:30 S 03 46 45.23 +18 21 31.0 L C51
2018-08-21 11:48:59 S 03 46 44.85 +18 18 14.9 L C51
2018-08-21 13:23:14 S 03 46 44.69 +18 16 36.0 L C51
2018-08-21 14:57:30 S 03 46 44.491 +18 14 58.42 L C51
2018-08-21 19:40:15 S 03 46 43.84 +18 10 04.6 L C51
2018-08-21 22:48:44 S 03 46 43.42 +18 06 48.4 L C51
2018-08-22 01:46:26 C 03 46 44.37 +18 03 34.1 q A17
2018-08-22 01:57:15 S 03 46 42.89 +18 03 32.6 L C51
2018-08-22 01:57:46 C 03 46 44.32 +18 03 22.5 q A17
2018-08-22 02:09:05 C 03 46 44.23 +18 03 11.0 q A17
2018-09-06 10:19:45 C 03 40 46.00 +11 56 50.2 V 703
2018-09-06 10:27:24 C 03 40 45.71 +11 56 43.1 V 703
2018-09-06 10:35:04 C 03 40 45.35 +11 56 36.4 V 703
2018-09-06 10:42:43 C 03 40 44.91 +11 56 28.3 V 703
2018-09-09 02:07:03 C 03 38 33.68 +10 54 52.6 o Z22
2018-09-09 02:10:44 C 03 38 33.52 +10 54 49.5 o Z22
2018-09-09 02:14:28 C 03 38 33.39 +10 54 45.9 o Z22
2018-09-09 02:22:05 C 03 38 33.07 +10 54 38.1 o Z22
2018-09-09 03:11:30 C 03 38 31.01 +10 53 49.8 o Z22
2018-09-09 03:15:10 C 03 38 30.88 +10 53 47.3 o Z22
2018-09-09 03:19:03 C 03 38 30.71 +10 53 42.7 o Z22
2018-09-09 03:23:05 C 03 38 30.54 +10 53 39.5 o Z22
2018-09-09 10:03:44 C 03 38 15.17 +10 47 10.6 V 703
2018-09-09 10:11:15 C 03 38 14.85 +10 47 03.3 V 703
2018-09-09 10:18:46 C 03 38 14.54 +10 46 56.0 V 703
2018-09-09 10:26:17 C 03 38 14.22 +10 46 48.9 V 703
2018-09-11 09:20:04 C 03 36 20.15 +10 01 25.3 G96
2018-09-11 09:27:31 C 03 36 19.80 +10 01 18.2 G96
2018-09-11 09:34:58 C 03 36 19.45 +10 01 11.0 G96
2018-09-11 09:42:26 C 03 36 19.11 +10 01 03.9 G96
2018-09-11 20:10:24 C 03 35 51.44 +09 50 57.4 q D29
2018-09-11 20:30:46 C 03 35 50.46 +09 50 37.7 q D29
2018-09-11 20:51:07 C 03 35 49.48 +09 50 18.1 q D29
2018-09-12 10:28:21 C 03 35 13.61 +09 37 09.3 703
2018-09-12 10:36:06 C 03 35 13.15 +09 37 01.8 703
2018-09-12 10:43:39 C 03 35 12.79 +09 36 54.6 703
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)