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
2018-10-26 13:44:40 S 02 18 01.601 -03 27 04.25 V C57
2018-10-26 13:44:40 s 1 -124793.65 5 +345035.72 8730.0 C57
2018-10-26 14:14:40 S 02 17 59.801 -03 27 13.18 V C57
2018-10-26 14:14:40 s 1 -125716.73 5 +344350.18 1560.0 C57
2018-10-26 14:44:40 S 02 17 57.667 -03 27 22.46 V C57
2018-10-26 14:44:40 s 1 -126636.45 0 +343655.54 7560.0 C57
2018-10-26 15:14:40 S 02 17 55.670 -03 27 31.68 V C57
2018-10-26 15:14:40 s 1 -127552.77 1 +342951.79 6530.0 C57
2018-10-26 15:44:40 S 02 17 53.635 -03 27 43.42 V C57
2018-10-26 15:44:40 s 1 -128465.66 3 +342238.94 8310.0 C57
2018-10-26 16:14:40 S 02 17 51.665 -03 27 47.63 V C57
2018-10-26 16:14:40 s 1 -129375.09 5 +341516.98 2700.0 C57
2018-10-26 16:44:40 S 02 17 49.349 -03 27 56.30 V C57
2018-10-26 16:44:40 s 1 -130281.03 4 +340785.90 9530.0 C57
2018-10-26 17:14:40 S 02 17 47.671 -03 28 04.84 V C57
2018-10-26 17:14:40 s 1 -131183.44 6 +340045.71 8600.0 C57
2018-10-26 17:44:40 S 02 17 45.514 -03 28 14.20 V C57
2018-10-26 17:44:40 s 1 -132082.29 9 +339296.40 9740.0 C57
2018-10-26 20:14:40 S 02 17 35.429 -03 28 54.62 V C57
2018-10-26 20:14:40 s 1 -136521.99 7 +335412.88 9780.0 C57
2018-10-26 20:44:40 S 02 17 33.581 -03 29 03.01 V C57
2018-10-26 20:44:40 s 1 -137398.78 5 +334608.75 9330.0 C57
2018-10-26 21:14:40 S 02 17 31.498 -03 29 14.21 V C57
2018-10-26 21:14:40 s 1 -138271.77 5 +333795.47 9610.0 C57
2018-10-26 21:44:40 S 02 17 29.755 -03 29 25.73 V C57
2018-10-26 21:44:40 s 1 -139140.93 2 +332973.04 430.0 C57
2018-10-26 22:14:40 S 02 17 27.396 -03 29 30.59 V C57
2018-10-26 22:14:40 s 1 -140006.22 1 +332141.45 1590.0 C57
2018-10-26 22:44:40 S 02 17 25.404 -03 29 39.23 V C57
2018-10-26 22:44:40 s 1 -140867.60 7 +331300.69 2890.0 C57
2018-10-26 23:14:40 S 02 17 23.647 -03 29 51.00 V C57
2018-10-26 23:14:40 s 1 -141725.05 3 +330450.76 4130.0 C57
2018-10-27 15:41:33 C 02 17 02.36 -03 36 10.8 q D29
2018-10-27 16:01:55 C 02 17 00.95 -03 36 17.1 q D29
2018-10-27 16:22:16 C 02 16 59.54 -03 36 23.5 q D29
2018-10-29 06:49:12 C 02 14 29.52 -03 47 37.9 V 703
2018-10-29 06:56:48 C 02 14 29.04 -03 47 40.0 V 703
2018-10-29 07:04:24 C 02 14 28.51 -03 47 42.3 V 703
2018-10-29 07:12:00 C 02 14 28.01 -03 47 44.3 V 703
2018-11-01 07:11:38 C 02 10 03.63 -04 05 15.5 V 703
2018-11-01 07:19:14 C 02 10 03.13 -04 05 16.6 V 703
2018-11-01 07:26:51 C 02 10 02.64 -04 05 18.2 V 703
2018-11-01 07:34:27 C 02 10 02.19 -04 05 19.7 V 703
2018-11-01 14:57:34 C 02 09 36.63 -04 06 51.3 q D29
2018-11-01 15:17:56 C 02 09 35.32 -04 06 56.2 q D29
2018-11-01 15:38:18 C 02 09 34.10 -04 07 00.4 q D29
2018-11-02 08:44:40 S 02 08 42.065 -04 13 02.96 V C57
2018-11-02 08:44:40 s 1 +143851.83 1 +19414.131 150.0 C57
2018-11-02 09:44:40 S 02 08 38.460 -04 13 15.82 V C57
2018-11-02 09:44:40 s 1 +145531.56 8 +25251.761 5770.0 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)