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
2018-11-09 21:14:40 s 1 -135307.26 8 +337368.38 3990.0 C57
2018-11-09 22:14:40 S 01 58 56.366 -04 31 00.62 V C57
2018-11-09 22:14:40 s 1 -136935.31 9 +335663.36 9570.0 C57
2018-11-10 00:44:40 S 01 58 49.834 -04 31 02.82 V C57
2018-11-10 00:44:40 s 1 -140939.45 3 +331244.69 1140.0 C57
2018-11-10 01:14:40 S 01 58 48.835 -04 31 02.53 V C57
2018-11-10 01:14:40 s 1 -141728.68 8 +330334.12 4650.0 C57
2018-11-10 01:44:40 S 01 58 47.369 -04 31 04.91 V C57
2018-11-10 01:44:40 s 1 -142513.97 8 +329414.58 6750.0 C57
2018-11-10 03:14:40 S 01 58 43.913 -04 31 01.13 V C57
2018-11-10 03:14:40 s 1 -144845.81 0 +326602.04 2670.0 C57
2018-11-10 03:44:40 S 01 58 42.458 -04 31 06.67 V C57
2018-11-10 03:44:40 s 1 -145614.95 3 +325646.52 7160.0 C57
2018-11-10 04:44:40 S 01 58 40.236 -04 31 05.23 V C57
2018-11-10 04:44:40 s 1 -147140.81 5 +323708.41 8690.0 C57
2018-11-10 05:14:40 S 01 58 39.336 -04 31 05.45 V C57
2018-11-10 05:14:40 s 1 -147897.45 7 +322725.80 5310.0 C57
2018-11-10 05:44:40 S 01 58 38.040 -04 31 08.76 V C57
2018-11-10 05:44:40 s 1 -148649.85 7 +321734.13 8880.0 C57
2018-11-10 06:14:40 S 01 58 36.518 -04 31 13.55 V C57
2018-11-10 06:14:40 s 1 -149397.97 6 +320733.41 9190.0 C57
2018-11-12 06:20:00 C 01 57 17.76 -04 33 42.9 V 703
2018-11-12 06:27:31 C 01 57 17.48 -04 33 43.1 V 703
2018-11-12 06:35:02 C 01 57 17.11 -04 33 44.0 V 703
2018-11-12 06:42:33 C 01 57 16.80 -04 33 43.4 V 703
2019-01-01 05:19:21 C 01 56 46.069 -00 11 57.36 U F51
2019-01-01 05:35:46 C 01 56 46.493 -00 11 51.85 U F51
2019-01-01 05:52:09 C 01 56 46.917 -00 11 46.29 U F51
2019-01-01 06:08:28 C 01 56 47.338 -00 11 41.01 U F51
2020-12-23 13:36:50 C 09 54 59.855 +05 01 40.82 U F52
2020-12-23 13:53:38 C 09 54 59.669 +05 01 40.55 U F52
2020-12-23 14:27:21 C 09 54 59.351 +05 01 40.75 U F52
2021-02-06 06:31:17 C 09 20 57.88 +07 46 26.2 V G96
2021-02-06 06:38:41 C 09 20 57.45 +07 46 28.7 V G96
2021-02-06 06:46:06 C 09 20 57.08 +07 46 30.9 V G96
2021-02-06 06:53:28 C 09 20 56.68 +07 46 32.7 V G96
2021-02-07 08:48:40 C 09 19 38.499 +07 54 24.65 U F51
2021-02-07 09:22:11 C 09 19 36.759 +07 54 34.92 U F51
2021-02-07 09:39:02 C 09 19 35.890 +07 54 40.13 U F51
2021-03-04 05:58:06 C 08 50 10.176 +11 11 35.51 U F51
2021-03-04 06:15:55 C 08 50 09.390 +11 11 41.43 U F51
2021-03-04 06:33:47 C 08 50 08.601 +11 11 47.31 U F51
2021-03-04 06:51:39 C 08 50 07.805 +11 11 53.29 U F51
2021-03-06 03:29:33 C 08 48 14.60 +11 26 20.5 V G96
2021-03-06 03:37:38 C 08 48 14.27 +11 26 23.0 V G96
2021-03-06 03:45:42 C 08 48 13.92 +11 26 25.7 V G96
2021-03-06 03:53:46 C 08 48 13.58 +11 26 28.2 V G96
2021-03-19 05:11:37 C 08 37 26.60 +13 00 01.0 V G96
2021-03-19 05:19:38 C 08 37 26.38 +13 00 03.0 V G96
2021-03-19 05:27:41 C 08 37 26.13 +13 00 04.9 V G96
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)