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
2018-11-06 05:44:40 S 02 03 07.414 -04 26 51.79 V C57
2018-11-06 05:44:40 s 1 +39758.047 0 +350669.21 9750.0 C57
2018-11-06 06:14:40 S 02 03 06.074 -04 26 51.54 V C57
2018-11-06 06:14:40 s 1 +38702.533 0 +351379.07 6880.0 C57
2018-11-06 07:44:40 S 02 03 01.200 -04 27 00.58 V C57
2018-11-06 07:44:40 s 1 +35530.588 0 +353450.53 8440.0 C57
2018-11-06 08:14:40 S 02 02 59.614 -04 27 02.95 V C57
2018-11-06 08:14:40 s 1 +34471.581 0 +354121.72 3080.0 C57
2018-11-06 08:44:40 S 02 02 57.686 -04 27 01.44 V C57
2018-11-06 08:44:40 s 1 +33411.782 0 +354783.29 140.0 C57
2018-11-06 09:14:40 S 02 02 56.302 -04 27 09.94 V C57
2018-11-06 09:14:40 s 1 +32351.224 0 +355435.25 9830.0 C57
2018-11-06 09:15:23 C 02 03 28.140 -04 24 58.32 U F52
2018-11-06 09:34:49 C 02 03 27.125 -04 25 00.57 U F52
2018-11-06 09:44:40 S 02 02 54.475 -04 27 05.36 V C57
2018-11-06 09:44:40 s 1 +31289.939 0 +356077.63 2370.0 C57
2018-11-06 09:54:18 C 02 03 26.111 -04 25 02.72 U F52
2018-11-06 10:13:47 C 02 03 25.096 -04 25 04.88 U F52
2018-11-06 10:50:32 C 02 03 23.18 -04 25 08.9 U T08
2018-11-06 11:04:59 C 02 03 22.42 -04 25 09.9 U T08
2018-11-06 11:19:25 C 02 03 21.67 -04 25 12.1 U T08
2018-11-06 11:33:57 C 02 03 20.93 -04 25 13.7 U T08
2018-11-06 12:14:40 S 02 02 46.927 -04 27 24.66 V C57
2018-11-06 12:14:40 s 1 +25973.706 0 +359146.40 4900.0 C57
2018-11-06 12:44:40 S 02 02 45.326 -04 27 18.65 V C57
2018-11-06 12:44:40 s 1 +24908.715 0 +359731.65 8810.0 C57
2018-11-06 13:14:40 S 02 02 43.428 -04 27 26.96 V C57
2018-11-06 13:14:40 s 1 +23843.214 0 +360307.43 6990.0 C57
2018-11-06 13:44:40 S 02 02 42.187 -04 27 24.91 V C57
2018-11-06 13:44:40 s 1 +22777.232 0 +360873.78 9640.0 C57
2018-11-06 14:14:40 S 02 02 40.584 -04 27 27.22 V C57
2018-11-06 14:14:40 s 1 +21710.800 0 +361430.70 6960.0 C57
2018-11-06 19:44:40 S 02 02 23.506 -04 27 52.63 V C57
2018-11-06 20:14:40 S 02 02 21.660 -04 27 53.64 V C57
2018-11-06 20:44:40 S 02 02 20.328 -04 28 00.44 V C57
2018-11-06 22:14:40 S 02 02 15.658 -04 28 03.11 V C57
2018-11-06 23:14:40 S 02 02 12.434 -04 28 05.09 V C57
2018-11-06 23:44:40 S 02 02 11.100 -04 28 10.81 V C57
2018-11-07 00:14:40 S 02 02 09.818 -04 28 13.33 V C57
2018-11-07 01:14:40 S 02 02 06.562 -04 28 17.00 V C57
2018-11-07 04:14:40 S 02 01 57.725 -04 28 29.82 V C57
2018-11-07 05:44:40 S 02 01 52.814 -04 28 32.27 V C57
2018-11-07 05:44:40 s 1 -11417.412 0 +374100.37 200.0 C57
2018-11-07 06:14:40 S 02 01 51.557 -04 28 38.93 V C57
2018-11-07 06:14:40 s 1 -12483.543 0 +374363.16 3150.0 C57
2018-11-07 06:44:40 S 02 01 50.064 -04 28 39.04 V C57
2018-11-07 06:44:40 s 1 -13549.234 0 +374616.97 6590.0 C57
2018-11-07 07:14:40 S 02 01 48.091 -04 28 34.79 V C57
2018-11-07 07:14:40 s 1 -14614.458 0 +374861.79 680.0 C57
2018-11-07 07:44:40 S 02 01 46.805 -04 28 41.59 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)