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
2018-11-02 10:14:40 S 02 08 36.442 -04 13 22.44 V C57
2018-11-02 10:14:40 s 1 +146314.72 8 +28161.095 2510.0 C57
2018-11-02 11:09:22 C 02 08 26.82 -04 10 48.2 U T08
2018-11-02 11:14:40 S 02 08 32.837 -04 13 40.19 V C57
2018-11-02 11:14:40 s 1 +147771.62 8 +33957.999 2890.0 C57
2018-11-02 11:23:49 C 02 08 25.95 -04 10 51.2 U T08
2018-11-02 11:38:23 C 02 08 25.08 -04 10 54.3 U T08
2018-11-02 11:52:57 C 02 08 24.22 -04 10 56.9 U T08
2018-11-02 13:14:40 S 02 08 24.662 -04 14 10.39 V C57
2018-11-02 13:14:40 s 1 +150269.12 0 +45451.151 4690.0 C57
2018-11-02 13:44:40 S 02 08 23.150 -04 14 11.72 V C57
2018-11-02 13:44:40 s 1 +150811.02 7 +48300.974 5880.0 C57
2018-11-02 14:14:40 S 02 08 21.168 -04 14 17.41 V C57
2018-11-02 14:14:40 s 1 +151321.34 7 +51140.661 3340.0 C57
2018-11-02 15:14:40 S 02 08 17.290 -04 14 33.00 V C57
2018-11-02 15:14:40 s 1 +152249.89 6 +56788.316 470.0 C57
2018-11-02 15:44:40 S 02 08 15.348 -04 14 39.08 V C57
2018-11-02 15:44:40 s 1 +152669.42 2 +59595.682 6740.0 C57
2018-11-02 16:14:40 S 02 08 13.166 -04 14 49.20 V C57
2018-11-02 16:14:40 s 1 +153059.95 7 +62391.705 2420.0 C57
2018-11-02 16:44:40 S 02 08 11.371 -04 14 51.58 V C57
2018-11-02 16:44:40 s 1 +153422.11 2 +65176.132 660.0 C57
2018-11-02 17:14:40 S 02 08 09.593 -04 15 03.31 V C57
2018-11-02 17:14:40 s 1 +153756.48 4 +67948.727 4550.0 C57
2018-11-02 18:14:40 S 02 08 05.510 -04 15 13.18 V C57
2018-11-02 18:14:40 s 1 +154344.19 8 +73457.561 1310.0 C57
2018-11-02 18:44:40 S 02 08 03.516 -04 15 18.68 V C57
2018-11-02 18:44:40 s 1 +154598.66 4 +76193.406 50.0 C57
2018-11-02 19:14:40 S 02 08 01.906 -04 15 24.16 V C57
2018-11-02 19:14:40 s 1 +154827.59 7 +78916.632 6180.0 C57
2018-11-02 19:44:40 S 02 07 59.566 -04 15 34.70 V C57
2018-11-02 19:44:40 s 1 +155031.52 6 +81627.074 2510.0 C57
2018-11-02 20:14:40 S 02 07 57.650 -04 15 37.44 V C57
2018-11-02 20:14:40 s 1 +155210.96 8 +84324.584 1760.0 C57
2018-11-02 20:44:40 S 02 07 56.047 -04 15 43.78 V C57
2018-11-02 20:44:40 s 1 +155366.42 7 +87009.023 6610.0 C57
2018-11-02 21:44:40 S 02 07 52.128 -04 15 58.10 V C57
2018-11-02 21:44:40 s 1 +155607.34 9 +92338.186 0.361 C57
2018-11-02 23:14:40 S 02 07 46.229 -04 16 15.06 V C57
2018-11-02 23:14:40 s 1 +155800.77 4 +100231.02 0.515 C57
2018-11-02 23:44:40 S 02 07 44.299 -04 16 27.01 V C57
2018-11-02 23:44:40 s 1 +155822.25 6 +102834.69 0.7 C57
2018-11-03 00:14:40 S 02 07 42.410 -04 16 27.62 V C57
2018-11-03 00:14:40 s 1 +155822.96 0 +105424.59 0.175 C57
2018-11-03 00:44:40 S 02 07 40.375 -04 16 37.56 V C57
2018-11-03 00:44:40 s 1 +155803.29 8 +108000.66 0.169 C57
2018-11-03 01:14:40 S 02 07 38.558 -04 16 50.30 V C57
2018-11-03 01:14:40 s 1 +155763.67 7 +110562.83 0.902 C57
2018-11-03 01:44:40 S 02 07 36.751 -04 16 44.90 V C57
2018-11-03 01:44:40 s 1 +155704.49 3 +113111.06 0.594 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)