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
2014-10-03 09:04:37 C 02 26 06.60 +26 01 13.5 q G96
2014-10-03 09:22:39 C 02 26 05.79 +26 01 04.4 q G96
2014-10-03 09:40:42 C 02 26 04.97 +26 00 55.1 q G96
2014-10-03 23:53:44 C 02 25 28.35 +25 53 33.7 q 160
2014-10-03 23:56:42 C 02 25 28.20 +25 53 32.0 q 160
2014-10-03 23:59:41 C 02 25 28.07 +25 53 30.4 q 160
2014-10-05 00:06:14 C 02 24 23.66 +25 40 41.5 q 160
2014-10-05 00:08:50 C 02 24 23.58 +25 40 40.1 q 160
2014-10-05 00:11:13 C 02 24 23.50 +25 40 39.9 q 160
2014-10-08 05:31:49 C 02 20 41.81 +24 56 08.8 q H21
2014-10-08 05:37:06 C 02 20 41.56 +24 56 06.0 q H21
2014-10-08 05:42:22 C 02 20 41.21 +24 56 03.1 q H21
2014-10-15 05:11:01 C 02 11 29.49 +23 02 05.0 q 703
2014-10-15 05:18:13 C 02 11 29.10 +23 02 00.0 q 703
2014-10-15 05:32:37 C 02 11 28.25 +23 01 49.1 q 703
2014-10-17 08:22:54 C 02 08 24.27 +22 22 32.3 q G96
2014-10-17 08:30:44 C 02 08 23.78 +22 22 26.1 q G96
2014-10-17 08:38:35 C 02 08 23.28 +22 22 19.8 q G96
2014-10-17 08:46:25 C 02 08 22.79 +22 22 13.5 q G96
2014-10-18 07:36:17 C 02 06 58.53 +22 03 54.1 q G96
2014-10-18 07:54:54 C 02 06 57.33 +22 03 39.1 q G96
2014-10-18 08:04:12 C 02 06 56.73 +22 03 31.5 q G96
2014-10-25 00:20:08 C 01 56 41.12 +19 44 05.6 q 160
2014-10-25 00:23:00 C 01 56 40.93 +19 44 03.2 q 160
2014-10-25 00:25:50 C 01 56 40.74 +19 44 00.4 q 160
2014-10-25 03:26:56 C 01 56 29.32 +19 41 13.4 u H21
2014-10-25 03:30:20 C 01 56 29.07 +19 41 10.5 u H21
2014-10-25 03:33:43 C 01 56 28.87 +19 41 07.3 u H21
2014-10-25 03:40:31 C 01 56 28.43 +19 41 00.9 u H21
2014-10-25 05:39:50 C 01 56 20.56 +19 39 12.7 q 703
2014-10-25 05:53:03 C 01 56 19.67 +19 38 59.8 q 703
2014-10-25 06:06:13 C 01 56 18.82 +19 38 47.9 q 703
2014-10-25 06:19:24 C 01 56 17.89 +19 38 35.6 q 703
2014-10-26 08:20:04 C 01 54 35.57 +19 14 19.4 q G96
2014-10-26 08:31:03 C 01 54 34.83 +19 14 09.0 q G96
2014-10-26 08:42:12 C 01 54 34.07 +19 13 58.5 q G96
2014-10-26 08:51:44 C 01 54 33.43 +19 13 49.4 q G96
2014-10-26 09:18:08 C 01 54 31.63 +19 13 23.8 R G45
2014-10-26 09:34:15 C 01 54 30.55 +19 13 08.7 R G45
2014-10-26 10:06:23 C 01 54 28.37 +19 12 38.1 R G45
2014-10-26 10:22:27 C 01 54 27.31 +19 12 23.0 R G45
2014-10-27 22:14:32 C 01 52 07.07 +18 38 18.8 q 160
2014-10-27 22:17:24 C 01 52 06.84 +18 38 15.4 q 160
2014-10-27 22:20:15 C 01 52 06.65 +18 38 12.8 q 160
2014-10-29 23:08:31 C 01 48 55.77 +17 50 54.8 q 160
2014-10-29 23:11:18 C 01 48 55.59 +17 50 52.3 q 160
2014-10-29 23:14:06 C 01 48 55.41 +17 50 49.7 q 160
2014-11-01 03:53:57 C 01 45 32.14 +16 58 50.8 q 703
2014-11-01 04:04:09 C 01 45 31.51 +16 58 41.0 q 703
2014-11-01 04:14:17 C 01 45 30.88 +16 58 30.3 q 703
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)