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
2018-10-23 23:14:40 S 02 22 31.550 -03 07 07.21 V C57
2018-10-24 00:14:40 S 02 22 27.010 -03 07 30.29 V C57
2018-10-24 00:44:40 S 02 22 24.787 -03 07 38.89 V C57
2018-10-24 01:14:40 S 02 22 22.500 -03 07 48.00 V C57
2018-10-24 01:44:40 S 02 22 20.191 -03 07 59.45 V C57
2018-10-24 02:44:40 S 02 22 15.732 -03 08 20.47 V C57
2018-10-24 03:14:40 S 02 22 13.517 -03 08 27.42 V C57
2018-10-24 03:44:40 S 02 22 11.138 -03 08 33.58 V C57
2018-10-24 05:14:40 S 02 22 04.543 -03 09 11.12 V C57
2018-10-24 05:44:40 S 02 22 01.999 -03 09 21.46 V C57
2018-10-24 06:14:40 S 02 21 59.698 -03 09 33.05 V C57
2018-10-24 06:44:40 S 02 21 57.559 -03 09 43.52 V C57
2018-10-24 07:14:40 S 02 21 55.474 -03 09 53.03 V C57
2018-10-24 07:14:40 s 1 -10399.574 0 +365091.36 1960.0 C57
2018-10-24 07:44:40 S 02 21 53.126 -03 10 03.65 V C57
2018-10-24 07:44:40 s 1 -11519.901 0 +365408.31 6450.0 C57
2018-10-24 08:14:40 S 02 21 50.822 -03 10 13.91 V C57
2018-10-24 08:14:40 s 1 -12639.882 0 +365715.67 9920.0 C57
2018-10-24 08:44:40 S 02 21 48.406 -03 10 24.38 V C57
2018-10-24 08:44:40 s 1 -13759.491 0 +366013.48 2530.0 C57
2018-10-24 09:14:40 S 02 21 46.646 -03 10 35.98 V C57
2018-10-24 09:14:40 s 1 -14878.697 0 +366301.73 4480.0 C57
2018-10-24 09:44:40 S 02 21 44.254 -03 10 46.60 V C57
2018-10-24 09:44:40 s 1 -15997.473 0 +366580.45 5940.0 C57
2018-10-24 10:14:40 S 02 21 41.854 -03 10 54.44 V C57
2018-10-24 10:14:40 s 1 -17115.790 0 +366849.64 7080.0 C57
2018-10-24 10:44:40 S 02 21 39.612 -03 11 05.06 V C57
2018-10-24 10:44:40 s 1 -18233.620 0 +367109.32 8080.0 C57
2018-10-24 11:14:40 S 02 21 37.291 -03 11 15.58 V C57
2018-10-24 11:14:40 s 1 -19350.936 0 +367359.50 9110.0 C57
2018-10-24 11:44:40 S 02 21 35.064 -03 11 27.53 V C57
2018-10-24 11:44:40 s 1 -20467.709 0 +367600.18 360.0 C57
2018-10-24 12:14:40 S 02 21 32.947 -03 11 36.96 V C57
2018-10-24 12:14:40 s 1 -21583.911 0 +367831.39 1990.0 C57
2018-10-24 14:14:40 S 02 21 24.010 -03 12 16.16 V C57
2018-10-24 14:14:40 s 1 -26042.460 0 +368661.65 5820.0 C57
2018-10-24 14:44:40 S 02 21 21.838 -03 12 26.53 V C57
2018-10-24 14:44:40 s 1 -27155.394 0 +368845.63 1950.0 C57
2018-10-24 19:44:40 S 02 20 59.868 -03 14 03.70 V C57
2018-10-24 19:44:40 s 1 -38239.795 0 +370169.30 8530.0 C57
2018-10-25 00:14:40 S 02 20 39.962 -03 15 31.82 V C57
2018-10-25 00:14:40 s 1 -48130.593 0 +370563.53 6070.0 C57
2018-10-25 00:44:40 S 02 20 37.752 -03 15 42.62 V C57
2018-10-25 00:44:40 s 1 -49223.705 0 +370560.99 1830.0 C57
2018-10-25 02:14:40 S 02 20 31.142 -03 16 13.26 V C57
2018-10-25 02:14:40 s 1 -52495.316 0 +370497.99 7850.0 C57
2018-10-25 02:44:40 S 02 20 28.807 -03 16 24.13 V C57
2018-10-25 02:44:40 s 1 -53583.190 0 +370458.54 3290.0 C57
2018-10-25 03:14:40 S 02 20 26.724 -03 16 33.38 V C57
2018-10-25 03:14:40 s 1 -54669.690 0 +370409.88 4060.0 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)