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
2015-12-02 10:56:53 C 04 46 01.379 +07 24 20.99 L F51
2015-12-03 08:37:52 C 04 44 52.665 +07 22 33.77 L F51
2015-12-03 08:55:10 C 04 44 51.740 +07 22 32.45 L F51
2015-12-03 09:12:30 C 04 44 50.798 +07 22 31.08 L F51
2015-12-03 09:29:57 C 04 44 49.860 +07 22 29.68 L F51
2015-12-04 07:39:26 C 04 43 39.903 +07 20 46.75 L F51
2015-12-04 07:58:47 C 04 43 38.869 +07 20 45.52 L F51
2015-12-04 08:18:04 C 04 43 37.840 +07 20 43.95 L F51
2015-12-05 11:07:39 C 04 42 13.275 +07 18 49.08 L F51
2015-12-05 11:42:13 C 04 42 11.429 +07 18 46.65 L F51
2015-12-05 11:59:35 C 04 42 10.505 +07 18 45.48 L F51
2015-12-12 10:51:16 C 04 33 43.467 +07 10 40.02 L F51
2015-12-12 11:08:19 C 04 33 42.612 +07 10 39.50 L F51
2015-12-12 11:25:10 C 04 33 41.768 +07 10 39.06 L F51
2015-12-12 11:41:58 C 04 33 40.931 +07 10 38.59 L F51
2015-12-19 04:57:20 C 04 26 13.80 +07 09 08.0 u H21
2015-12-19 05:17:17 C 04 26 12.89 +07 09 07.9 u H21
2016-01-01 08:01:26 C 04 14 32.282 +07 23 06.65 L F51
2016-01-01 08:19:58 C 04 14 31.701 +07 23 08.14 L F51
2016-01-01 08:38:25 C 04 14 31.133 +07 23 09.45 L F51
2016-01-01 08:56:56 C 04 14 30.540 +07 23 10.84 L F51
2017-12-20 11:47:26 C 11 51 39.16 -02 04 33.6 U G96
2017-12-20 11:54:52 C 11 51 39.52 -02 04 34.9 U G96
2017-12-20 12:02:17 C 11 51 39.84 -02 04 37.5 U G96
2017-12-20 12:09:42 C 11 51 40.20 -02 04 39.4 U G96
2018-01-17 15:08:51 C 12 19 28.690 -04 08 39.06 U F51
2018-01-17 15:21:16 C 12 19 29.096 -04 08 40.36 U F51
2018-01-17 15:33:44 C 12 19 29.484 -04 08 41.23 U F51
2018-01-17 15:46:12 C 12 19 29.910 -04 08 42.71 U F51
2018-02-07 21:04:46 C 12 33 13.57 -04 13 16.9 q D29
2018-02-07 21:27:41 C 12 33 13.97 -04 13 13.8 q D29
2018-02-26 10:12:33 C 12 36 12.16 -02 18 57.5 U G96
2018-02-26 10:21:45 C 12 36 12.09 -02 18 53.6 U G96
2018-02-26 10:30:57 C 12 36 12.00 -02 18 49.6 U G96
2018-02-26 10:40:10 C 12 36 11.93 -02 18 45.7 U G96
2018-02-27 07:43:58 C 12 36 03.83 -02 09 26.6 U 703
2018-02-27 07:51:43 C 12 36 03.75 -02 09 23.0 U 703
2018-02-27 07:59:29 C 12 36 03.64 -02 09 20.0 U 703
2018-02-27 08:07:16 C 12 36 03.57 -02 09 16.2 U 703
2018-03-09 10:37:23 C 12 32 11.10 +00 10 04.2 U 703
2018-03-09 10:45:02 C 12 32 10.90 +00 10 09.5 U 703
2018-03-09 10:52:42 C 12 32 10.65 +00 10 14.4 U 703
2018-03-09 11:00:22 C 12 32 10.53 +00 10 19.6 U 703
2018-03-13 07:05:03 C 12 29 33.04 +01 20 20.3 U 703
2018-03-13 07:11:37 C 12 29 32.78 +01 20 26.3 U 703
2018-03-13 07:18:11 C 12 29 32.61 +01 20 31.8 U 703
2018-03-13 07:24:45 C 12 29 32.36 +01 20 36.2 U 703
2018-03-14 20:20:33 C 12 28 17.71 +01 51 32.6 q 108
2018-03-14 20:32:34 C 12 28 17.22 +01 51 42.5 q 108
2018-03-14 20:42:42 C 12 28 16.88 +01 51 51.1 q 108
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)