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
2018-11-09 04:14:40 s 1 -105590.14 5 +360957.75 9640.0 C57
2018-11-09 05:44:40 S 01 59 38.028 -04 30 34.92 V C57
2018-11-09 05:44:40 s 1 -108351.96 1 +359283.13 700.0 C57
2018-11-09 06:12:16 C 02 00 15.31 -04 31 02.0 V 703
2018-11-09 06:14:40 S 01 59 36.890 -04 30 32.87 V C57
2018-11-09 06:14:40 s 1 -109267.12 5 +358707.52 2130.0 C57
2018-11-09 06:19:48 C 02 00 14.97 -04 31 02.6 V 703
2018-11-09 06:27:21 C 02 00 14.63 -04 31 03.0 V 703
2018-11-09 06:36:12 C 02 00 14.14 -04 31 03.7 V 703
2018-11-09 06:44:40 S 01 59 35.088 -04 30 36.61 V C57
2018-11-09 06:44:40 s 1 -110179.52 3 +358123.22 8840.0 C57
2018-11-09 07:14:40 S 01 59 33.922 -04 30 40.14 V C57
2018-11-09 07:14:40 s 1 -111089.12 7 +357530.20 670.0 C57
2018-11-09 07:44:40 S 01 59 32.714 -04 30 35.93 V C57
2018-11-09 07:44:40 s 1 -111995.91 0 +356928.47 7460.0 C57
2018-11-09 08:14:40 S 01 59 31.387 -04 30 41.08 V C57
2018-11-09 08:14:40 s 1 -112899.84 5 +356318.03 9060.0 C57
2018-11-09 08:44:40 S 01 59 30.173 -04 30 42.19 V C57
2018-11-09 08:44:40 s 1 -113800.90 3 +355698.86 5300.0 C57
2018-11-09 09:14:40 S 01 59 29.052 -04 30 39.02 V C57
2018-11-09 09:14:40 s 1 -114699.05 6 +355070.96 6020.0 C57
2018-11-09 09:44:40 S 01 59 27.689 -04 30 36.29 V C57
2018-11-09 09:44:40 s 1 -115594.27 7 +354434.33 1060.0 C57
2018-11-09 10:14:40 S 01 59 26.458 -04 30 42.52 V C57
2018-11-09 10:14:40 s 1 -116486.53 6 +353788.97 250.0 C57
2018-11-09 10:44:40 S 01 59 24.986 -04 30 48.38 V C57
2018-11-09 10:44:40 s 1 -117375.80 6 +353134.87 3440.0 C57
2018-11-09 11:14:40 S 01 59 23.573 -04 30 39.42 V C57
2018-11-09 11:14:40 s 1 -118262.05 7 +352472.01 460.0 C57
2018-11-09 11:44:40 S 01 59 22.399 -04 30 46.87 V C57
2018-11-09 11:44:40 s 1 -119145.26 1 +351800.41 1150.0 C57
2018-11-09 12:44:40 S 01 59 19.618 -04 30 50.18 V C57
2018-11-09 12:44:40 s 1 -120902.41 1 +350430.91 2850.0 C57
2018-11-09 13:44:40 S 01 59 16.997 -04 30 49.50 V C57
2018-11-09 13:44:40 s 1 -122647.02 0 +349026.33 7210.0 C57
2018-11-09 14:14:40 S 01 59 16.152 -04 30 49.64 V C57
2018-11-09 14:14:40 s 1 -123514.54 8 +348310.88 3710.0 C57
2018-11-09 14:44:40 S 01 59 14.983 -04 30 50.08 V C57
2018-11-09 14:44:40 s 1 -124378.85 1 +347586.63 2870.0 C57
2018-11-09 17:14:40 S 01 59 08.400 -04 30 53.32 V C57
2018-11-09 17:14:40 s 1 -128650.92 8 +343833.31 2450.0 C57
2018-11-09 17:44:40 S 01 59 07.423 -04 30 47.34 V C57
2018-11-09 17:44:40 s 1 -129495.23 9 +343056.18 3900.0 C57
2018-11-09 18:44:40 S 01 59 04.769 -04 30 52.78 V C57
2018-11-09 18:44:40 s 1 -131173.50 7 +341475.41 910.0 C57
2018-11-09 19:14:40 S 01 59 03.348 -04 30 57.20 V C57
2018-11-09 19:14:40 s 1 -132007.39 9 +340671.74 6120.0 C57
2018-11-09 20:44:40 S 01 58 59.491 -04 30 59.29 V C57
2018-11-09 20:44:40 s 1 -134487.72 1 +338207.54 6330.0 C57
2018-11-09 21:14:40 S 01 58 58.918 -04 30 52.06 V C57
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)