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
1998-10-27 11:23:42 C 04 32 20.25 +07 16 53.0 658
1998-10-27 11:30:07 C 04 32 19.70 +07 16 51.2 658
1998-11-27 07:40:35 C 03 49 38.02 +04 32 44.4 a 696
1998-11-27 09:14:24 C 03 49 32.68 +04 32 34.2 a 696
1998-12-13 06:55:49 C 03 31 40.96 +04 16 53.6 z 711
1998-12-14 06:35:15 C 03 30 48.37 +04 17 31.5 z 711
1998-12-14 06:54:16 C 03 30 47.65 +04 17 31.9 z 711
2001-02-20 05:54:54 C 10 23 38.159 +05 12 38.23 e 645
2001-02-20 05:59:54 C 10 23 37.877 +05 12 40.51 20.66 e 645
2001-04-11 10:46:38 C 09 26 23.62 +14 26 36.3 413
2001-04-11 10:51:16 C 09 26 23.54 +14 26 38.0 413
2001-04-11 10:55:52 C 09 26 23.43 +14 26 39.5 413
2001-10-29 04:55:56 C 20 13 32.64 -22 31 32.3 t 608
2001-10-29 05:11:17 C 20 13 36.72 -22 31 28.9 t 608
2001-10-29 05:26:51 C 20 13 40.82 -22 31 24.4 t 608
2001-11-19 04:49:11 C 22 03 34.92 -18 07 51.7 20.1 c 608
2001-11-19 05:04:32 C 22 03 37.56 -18 07 41.5 20.5 c 608
2001-11-19 05:19:45 C 22 03 40.18 -18 07 31.3 20.8 c 608
2004-01-28 08:03:21 C 08 43 54.704 +08 48 42.85 e 645
2004-01-28 08:08:21 C 08 43 54.460 +08 48 44.05 22.46 e 645
2004-04-15 03:34:32 C 07 59 59.194 +15 15 07.31 645
2004-04-15 03:39:19 C 07 59 59.290 +15 15 07.99 645
2008-02-18 10:59:11 C 14 40 50.62 -11 13 00.2 r G96
2008-02-18 11:08:51 C 14 40 51.70 -11 13 00.6 r G96
2008-02-18 11:18:25 C 14 40 52.86 -11 13 01.9 r G96
2008-02-18 11:28:07 C 14 40 53.94 -11 13 02.5 r G96
2008-02-28 12:19:15 C 15 11 23.23 -11 15 18.9 r 448
2008-02-28 12:31:02 C 15 11 24.81 -11 15 19.0 r 448
2008-02-28 12:42:20 C 15 11 26.36 -11 15 18.0 r 448
2008-03-04 12:23:22 C 15 28 57.21 -11 02 34.9 r G96
2008-03-04 12:29:56 C 15 28 58.18 -11 02 33.9 r G96
2008-03-04 12:36:31 C 15 28 59.19 -11 02 32.8 r G96
2008-03-04 12:43:00 C 15 29 00.16 -11 02 31.9 r G96
2008-03-05 11:32:54 C 15 32 34.00 -10 58 47.7 r 703
2008-03-05 11:45:23 C 15 32 35.98 -10 58 45.6 r 703
2008-03-05 11:57:46 C 15 32 37.86 -10 58 43.8 r 703
2008-03-05 12:10:09 C 15 32 39.76 -10 58 41.5 r 703
2008-03-07 10:35:58 C 15 40 09.24 -10 49 38.4 18.6 c 704
2008-03-07 11:09:20 C 15 40 14.69 -10 49 31.1 18.6 c 704
2008-03-07 11:25:40 C 15 40 17.29 -10 49 27.5 18.7 c 704
2008-03-07 11:41:59 C 15 40 19.97 -10 49 23.3 18.8 c 704
2008-03-07 11:58:18 C 15 40 22.60 -10 49 20.7 18.7 c 704
2008-03-08 10:36:10 C 15 44 09.51 -10 44 08.7 17.9 c 704
2008-03-08 10:52:14 C 15 44 12.18 -10 44 04.7 18.2 c 704
2008-03-08 11:08:15 C 15 44 14.85 -10 44 00.7 18.3 c 704
2008-03-08 11:24:17 C 15 44 17.45 -10 43 57.6 18.4 c 704
2008-03-08 11:40:18 C 15 44 20.13 -10 43 53.6 17.9 c 704
2008-03-12 12:18:11 C 16 01 28.95 -10 15 36.9 r 703
2008-03-12 12:22:06 C 16 01 29.56 -10 15 36.0 r 703
2008-03-12 12:26:00 C 16 01 30.21 -10 15 33.1 r 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)