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
2016-12-22 08:03:37 C 02 04 19.81 -04 12 02.3 L T05
2016-12-22 08:15:09 C 02 04 19.68 -04 12 08.0 L T05
2016-12-22 08:22:43 C 02 04 19.59 -04 12 11.2 L T05
2016-12-22 08:34:04 C 02 04 19.47 -04 12 16.8 L T05
2016-12-22 08:53:08 C 02 04 19.26 -04 12 26.2 L T05
2016-12-22 09:00:05 C 02 04 19.20 -04 12 28.8 L T05
2016-12-22 09:19:03 C 02 04 19.01 -04 12 37.3 L T05
2016-12-23 21:41:31 C 02 04 03.56 -04 28 48.1 q 160
2016-12-23 21:44:34 C 02 04 03.52 -04 28 49.5 q 160
2016-12-23 21:47:36 C 02 04 03.48 -04 28 51.0 q 160
2016-12-25 06:22:05 C 02 03 55.424 -04 42 17.23 L F51
2016-12-25 06:41:39 C 02 03 55.320 -04 42 24.98 L F51
2016-12-25 07:01:11 C 02 03 55.210 -04 42 32.91 L F51
2016-12-25 07:20:40 C 02 03 55.110 -04 42 40.61 L F51
2016-12-28 02:47:12 C 02 03 55.08 -05 07 45.5 q H45
2016-12-28 02:48:52 C 02 03 55.10 -05 07 46.3 q H45
2016-12-28 02:50:39 C 02 03 55.10 -05 07 47.2 q H45
2016-12-31 21:22:33 C 02 04 29.56 -05 35 48.2 t 160
2016-12-31 21:25:10 C 02 04 29.57 -05 35 48.6 t 160
2016-12-31 21:27:22 C 02 04 29.58 -05 35 48.8 t 160
2017-01-03 07:01:18 C 02 05 11.64 -05 50 27.2 L T05
2017-01-03 07:22:23 C 02 05 11.91 -05 50 33.2 L T05
2017-01-03 07:42:44 C 02 05 12.17 -05 50 37.3 L T05
2017-01-03 08:05:01 C 02 05 12.44 -05 50 42.5 L T05
2017-01-03 21:44:25 C 02 05 24.66 -05 53 53.1 q 160
2017-01-03 21:47:24 C 02 05 24.71 -05 53 54.7 q 160
2017-01-03 21:50:22 C 02 05 24.72 -05 53 55.5 q 160
2017-01-05 02:32:29 C 02 05 53.42 -06 00 05.1 q H45
2017-01-05 02:34:05 C 02 05 53.43 -06 00 05.8 q H45
2017-01-05 02:36:01 C 02 05 53.45 -06 00 05.9 q H45
2017-01-25 20:07:16 C 02 22 48.91 -06 36 02.0 q 160
2017-01-25 20:10:14 C 02 22 49.05 -06 36 01.1 q 160
2017-01-25 20:13:11 C 02 22 49.23 -06 36 01.2 q 160
2017-01-27 06:47:36 C 02 24 32.77 -06 34 26.7 L T05
2017-01-27 07:08:43 C 02 24 33.84 -06 34 26.8 L T05
2017-01-27 07:31:41 C 02 24 34.93 -06 34 25.9 L T05
2017-01-27 07:54:46 C 02 24 36.16 -06 34 24.3 L T05
2017-01-31 01:59:21 C 02 29 24.94 -06 28 33.8 q 703
2017-01-31 02:05:59 C 02 29 25.31 -06 28 33.1 q 703
2017-01-31 02:12:39 C 02 29 25.66 -06 28 32.4 q 703
2017-01-31 02:19:20 C 02 29 26.04 -06 28 32.3 q 703
2017-02-01 01:31:06 C 02 30 44.50 -06 26 37.2 q H45
2017-02-01 01:32:53 C 02 30 44.63 -06 26 37.1 q H45
2017-02-01 01:34:16 C 02 30 44.68 -06 26 37.0 q H45
2017-02-01 01:36:03 C 02 30 44.79 -06 26 36.9 q H45
2017-02-01 01:37:50 C 02 30 44.86 -06 26 36.8 q H45
2017-02-01 01:39:35 C 02 30 44.99 -06 26 36.5 q H45
2017-02-14 19:35:14 C 02 52 12.80 -05 44 33.9 q 160
2017-02-14 19:38:14 C 02 52 13.01 -05 44 33.5 q 160
2017-02-14 19:41:02 C 02 52 13.21 -05 44 31.9 q 160
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)