1998 SH2

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.7138620135 ± 1.49e-08
Semi-major axis (a)2.7430809123 AU ± 1.67e-08
Inclination (i)2.42591843° ± 2.63e-06
Long. of Asc. Node (Ω)6.07706071° ± 2.56e-05
Arg. of Perihelion (ω)268.71719953° ± 2.65e-05
Mean Anomaly (M)26.60077850° ± 1.56e-07
Mean Motion (n)0.2169473497°/day ± 1.98e-09
Perihelion dist (q)0.78489965 AU ± 4.11e-08
Aphelion dist (Q)4.70126218 AU ± 4.99e-08
Orbital Period4.54315890 yr ± 4.15e-08
NGA Modelr2
A2-5.75894754e-13 ± 2.37e-14 AU/d²
Physical Parameters
H (abs. magnitude)20.88
G (slope)0.15
Alternative Designations

2016 EC156

Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.197″
Uncertainty0
Orbit TypeApollo
MOID0.019237 AU
Observations Used341
Radar Obs Used1
Oppositions21
Arc Total1998-2025
First Observation Used1998-09-17
Last Observation Used2025-10-25
Observations (378)
Date Type RA Dec Mag Band Observatory
2016-10-27 06:02:06 C 01 29 20.79 +11 26 39.7 o 291
2016-10-27 06:12:30 C 01 29 20.11 +11 26 35.9 o 291
2025-08-31 03:59:48 B 03 18 35.454 -58 43 24.32 Z Y05
2025-08-31 04:02:43 B 03 18 14.224 -58 41 59.58 Z Y05
2025-08-31 04:03:47 B 03 18 06.459 -58 41 28.32 Z Y05
2025-08-31 04:06:09 B 03 17 49.303 -58 40 18.85 Z Y05
2025-09-01 02:23:00 B 01 35 27.652 -45 39 56.99 Z Y05
2025-09-01 02:24:25 B 01 35 23.582 -45 39 10.10 Z Y05
2025-09-01 02:25:49 B 01 35 19.635 -45 38 24.22 Z Y05
2025-09-01 02:27:09 B 01 35 15.781 -45 37 40.08 Z Y05
2025-09-01 06:06:56 C 01 25 35.770 -43 36 52.49 V W68
2025-09-01 06:11:37 C 01 25 24.014 -43 34 23.02 V W68
2025-09-01 06:18:53 C 01 25 05.801 -43 30 30.60 V W68
2025-09-01 06:34:43 C 01 24 26.438 -43 22 05.81 V W68
2025-09-03 02:43:22 B 00 28 28.598 -26 40 22.37 Z X33
2025-09-03 02:45:55 B 00 28 26.642 -26 39 44.86 Z X33
2025-09-03 02:48:27 B 00 28 24.948 -26 39 06.26 Z X33
2025-09-03 11:03:35 C 00 23 12.802 -24 43 37.70 V T05
2025-09-03 11:08:11 C 00 23 09.936 -24 42 37.22 V T05
2025-09-03 11:15:24 C 00 23 05.443 -24 41 02.29 V T05
2025-09-03 11:55:37 C 00 22 40.584 -24 32 15.00 V T05
2025-09-04 10:44:07 C 00 12 24.610 -20 20 33.29 V T05
2025-09-04 10:48:02 C 00 12 22.982 -20 19 57.32 V T05
2025-09-04 11:18:33 C 00 12 10.334 -20 15 16.31 V T05
2025-09-04 11:37:04 C 00 12 02.705 -20 12 26.46 V T05
2025-09-04 14:10:56 C 00 11 10.594 -19 47 01.61 V Q62
2025-09-04 14:17:20 C 00 11 08.102 -19 46 05.73 V Q62
2025-09-04 14:18:34 C 00 11 07.616 -19 45 54.72 V Q62
2025-09-04 14:23:43 C 00 11 05.611 -19 45 09.83 V Q62
2025-09-04 14:30:05 C 00 11 03.125 -19 44 13.81 V Q62
2025-09-04 14:32:39 C 00 11 02.133 -19 43 51.62 V Q62
2025-09-04 14:38:43 C 00 10 59.764 -19 42 58.46 V Q62
2025-09-04 14:45:06 C 00 10 57.301 -19 42 02.76 V Q62
2025-09-04 14:46:16 C 00 10 56.844 -19 41 52.57 V Q62
2025-09-04 14:51:32 C 00 10 54.799 -19 41 06.25 V Q62
2025-09-04 14:57:57 C 00 10 52.306 -19 40 10.57 V Q62
2025-09-04 14:59:52 C 00 10 51.563 -19 39 53.75 V Q62
2025-09-05 01:02:17 C 00 07 38.143 -18 20 46.03 Z C23
2025-09-05 01:03:56 C 00 07 37.586 -18 20 33.14 Z C23
2025-09-05 01:40:29 C 00 07 25.822 -18 15 53.14 Z C23
2025-09-05 01:41:44 C 00 07 25.524 -18 15 43.52 Z C23
2025-09-05 23:31:00 B 00 01 56.878 -15 50 51.94 V L65
2025-09-05 23:45:03 B 00 01 53.472 -15 49 30.72 V L65
2025-09-05 23:59:06 B 00 01 50.095 -15 48 09.86 V L65
2025-09-06 03:30:00 C 00 01 08.767 -15 25 40.80 V W68
2025-09-06 03:33:55 C 00 01 07.817 -15 25 19.49 V W68
2025-09-06 03:35:13 C 00 01 07.531 -15 25 12.36 V W68
2025-09-06 03:39:28 C 00 01 06.518 -15 24 49.46 V W68
2025-09-06 03:44:03 C 00 01 05.436 -15 24 24.19 V W68
2025-09-06 04:14:29 C 00 00 58.198 -15 21 38.34 V W68
Radar Observations (1)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2025-09-02 09:50:00 35184874.99 3 us 8560 -14 -14
Station codes
-14 DSS-14 Goldstone (70-m)