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
2025-11-01 15:20:00 C 04 59 48.279 +08 17 27.97 X F51
2025-11-14 09:30:53 C 04 44 28.590 +07 12 11.66 V G96
2025-11-14 09:38:16 C 04 44 28.151 +07 12 09.83 V G96
2025-11-14 09:45:39 C 04 44 27.755 +07 12 08.28 V G96
2025-11-14 09:53:02 C 04 44 27.337 +07 12 07.27 V G96
2025-11-16 10:24:23 C 04 41 48.029 +07 03 15.44 X F51
2025-11-16 10:41:54 C 04 41 47.035 +07 03 12.33 X F51
2025-11-16 10:59:27 C 04 41 46.043 +07 03 09.07 X F51
2025-11-16 11:17:03 C 04 41 45.047 +07 03 05.99 X F51
2025-11-18 18:15:34 C 04 38 41.78 +06 53 38.1 V D29
2025-11-18 18:35:56 C 04 38 40.61 +06 53 34.3 V D29
2025-12-09 09:30:42 C 04 11 57.618 +06 02 54.67 X F51
2025-12-09 10:07:26 C 04 11 55.794 +06 02 53.34 X F51
2025-12-09 10:25:45 C 04 11 54.880 +06 02 52.86 X F51
2026-01-08 06:02:05 C 03 48 25.422 +06 42 41.04 X F52
2026-01-08 06:20:01 C 03 48 25.128 +06 42 43.47 X F52
2026-01-08 06:38:13 C 03 48 24.812 +06 42 45.96 X F52
2026-01-08 06:56:21 C 03 48 24.531 +06 42 48.23 X F52
2026-01-21 07:17:18 C 03 45 51.386 +07 30 57.54 X F52
2026-01-21 07:33:21 C 03 45 51.380 +07 31 00.32 X F52
2026-01-21 07:49:20 C 03 45 51.310 +07 31 03.28 X F52
2026-02-04 06:00:49 C 03 47 44.876 +08 33 46.39 X F52
2026-02-04 06:16:59 C 03 47 45.076 +08 33 49.45 X F52
2026-02-04 06:49:09 C 03 47 45.403 +08 33 55.88 X F52
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)