12538 (1998 OH)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar ⇩ Gaia
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.4059016556 ± 4.35e-09
Semi-major axis (a)1.5415724184 AU ± 7.25e-10
Inclination (i)24.53563599° ± 8.41e-07
Long. of Asc. Node (Ω)220.68792372° ± 1.75e-06
Arg. of Perihelion (ω)321.78911043° ± 1.84e-06
Mean Anomaly (M)163.00612547° ± 9.55e-07
Mean Motion (n)0.5149515611°/day ± 3.63e-10
Perihelion dist (q)0.91584562 AU ± 6.72e-09
Aphelion dist (Q)2.16729922 AU ± 6.78e-09
Orbital Period1.91401747 yr ± 1.35e-09
Physical Parameters
H (abs. magnitude)15.96
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.272″
Uncertainty0
Orbit TypeApollo
MOID0.029256 AU
Observations Used10512
Radar Obs Used1
Gaia Obs Used113
Oppositions14
Arc Total1987-2025
First Observation Used1987-08-22
Last Observation Used2025-12-01
Observations (19002)
Date Type RA Dec Mag Band Observatory
2016-10-24 11:19:22 C 03 18 27.55 +17 51 29.1 L T05
2016-10-24 11:26:03 C 03 18 27.21 +17 51 23.1 L T05
2016-10-24 11:48:23 C 03 18 25.92 +17 51 02.1 L T05
2016-10-24 11:58:10 C 03 18 25.35 +17 50 54.0 L T05
2016-10-25 02:25:29 C 03 17 38.01 +17 37 41.7 o Z22
2016-10-25 02:36:29 C 03 17 37.31 +17 37 31.3 o Z22
2016-10-25 02:47:15 C 03 17 36.74 +17 37 21.0 o Z22
2016-10-25 13:42:25 C 03 17 00.089 +17 27 17.43 L F51
2016-10-25 14:01:58 C 03 16 58.956 +17 26 59.15 L F51
2016-10-25 14:21:37 C 03 16 57.814 +17 26 40.77 L F51
2016-10-28 01:03:57 C 03 13 34.53 +16 30 46.5 o Z22
2016-10-29 07:58:17 C 03 11 42.03 +16 00 16.4 q 703
2016-10-29 08:04:47 C 03 11 41.60 +16 00 10.0 q 703
2016-10-29 08:11:17 C 03 11 41.21 +16 00 03.3 q 703
2016-10-29 08:17:46 C 03 11 40.78 +15 59 56.7 q 703
2016-10-30 01:21:35 C 03 10 37.17 +15 42 45.9 q 160
2016-10-30 01:23:32 C 03 10 37.04 +15 42 44.1 q 160
2016-10-30 01:25:28 C 03 10 36.91 +15 42 42.0 q 160
2016-10-31 01:54:33 C 03 09 04.13 +15 17 42.8 q 160
2016-10-31 01:56:28 C 03 09 04.00 +15 17 40.9 q 160
2016-10-31 01:58:23 C 03 09 03.87 +15 17 38.8 q 160
2016-11-01 01:00:40 C 03 07 35.09 +14 53 46.6 q 160
2016-11-01 01:02:37 C 03 07 34.96 +14 53 44.5 q 160
2016-11-01 01:04:34 C 03 07 34.82 +14 53 42.4 q 160
2016-11-04 11:38:24 C 03 02 04.93 +13 25 30.0 L T05
2016-11-04 11:48:03 C 03 02 04.25 +13 25 19.2 L T05
2016-11-04 12:12:07 C 03 02 02.54 +13 24 53.1 L T05
2016-11-04 12:20:34 C 03 02 01.94 +13 24 43.7 L T05
2016-11-05 05:19:24 C 03 00 52.84 +13 06 04.0 q G96
2016-11-05 05:34:12 C 03 00 51.80 +13 05 47.8 q G96
2016-11-05 05:40:32 C 03 00 51.35 +13 05 40.8 q G96
2016-11-05 05:46:44 C 03 00 50.91 +13 05 34.0 q G96
2016-11-05 07:12:38 C 03 00 44.83 +13 03 59.5 q 703
2016-11-05 07:21:18 C 03 00 44.17 +13 03 50.2 q 703
2016-11-05 07:29:57 C 03 00 43.54 +13 03 40.9 q 703
2016-11-05 07:38:36 C 03 00 42.93 +13 03 31.2 q 703
2016-11-05 16:23:31 C 03 00 06.78 +12 53 51.4 q D29
2016-11-05 16:43:52 C 03 00 05.32 +12 53 28.8 q D29
2016-11-05 17:04:14 C 03 00 03.86 +12 53 06.2 q D29
2016-11-06 20:22:08 C 02 58 10.79 +12 22 42.8 u 107
2016-11-06 20:27:57 C 02 58 10.36 +12 22 36.3 u 107
2016-11-06 20:34:17 C 02 58 09.91 +12 22 29.3 u 107
2016-11-07 07:03:09 C 02 57 25.76 +12 10 47.5 q G96
2016-11-07 07:08:19 C 02 57 25.37 +12 10 41.5 q G96
2016-11-07 07:13:09 C 02 57 25.02 +12 10 36.1 q G96
2016-11-07 07:17:54 C 02 57 24.68 +12 10 30.8 q G96
2016-11-07 23:18:46 C 02 56 17.32 +11 52 28.0 c A24
2016-11-07 23:19:53 C 02 56 17.24 +11 52 27.1 c A24
2016-11-08 00:26:28 C 02 56 12.43 +11 51 11.7 c A24
2016-11-08 00:27:32 C 02 56 12.37 +11 51 10.7 c A24
Radar Observations (1)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2019-05-14 21:19:00 24772.1678 4 Hz 2380 -1 -1
Station codes
-1 Arecibo (305-m, 1963–2020)