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
2023-06-28 23:17:08 C 21 25 12.95 +32 30 51.1 X C95
2023-06-30 11:41:20 C 21 23 42.571 +32 51 27.32 V T05
2023-06-30 12:18:34 C 21 23 40.853 +32 51 48.17 V T05
2023-06-30 12:22:29 C 21 23 40.673 +32 51 50.47 V T05
2023-06-30 12:26:23 C 21 23 40.490 +32 51 52.67 V T05
2023-06-30 23:01:27 C 21 23 13.34 +32 57 30.7 X C95
2023-06-30 23:14:00 C 21 23 12.78 +32 57 37.1 X C95
2023-07-04 10:22:12 C 21 19 19.738 +33 38 35.81 V T05
2023-07-04 10:36:22 C 21 19 19.001 +33 38 42.29 V T05
2023-07-04 11:32:16 C 21 19 16.090 +33 39 08.78 V T05
2023-07-04 12:06:59 C 21 19 14.246 +33 39 23.83 V T05
2023-07-06 12:32:13 C 21 16 44.314 +33 59 45.20 V T05
2023-07-06 12:34:20 C 21 16 44.162 +33 59 46.03 V T05
2023-07-06 12:39:03 C 21 16 43.927 +33 59 48.01 V T05
2023-07-06 13:15:58 C 21 16 41.834 +34 00 02.38 V T05
2023-07-08 11:39:42 C 21 14 09.449 +34 17 03.05 V T05
2023-07-08 12:04:53 C 21 14 07.951 +34 17 11.90 V T05
2023-07-08 12:08:09 C 21 14 07.762 +34 17 12.52 V T05
2023-07-08 12:12:51 C 21 14 07.502 +34 17 14.35 V T05
2023-07-12 13:04:13 C 21 08 22.812 +34 44 32.10 V T05
2023-07-12 13:08:28 C 21 08 22.531 +34 44 33.04 V T05
2023-07-12 13:55:55 C 21 08 19.452 +34 44 43.44 V T05
2023-07-13 10:07:32 C 21 07 04.332 +34 48 57.28 V T05
2023-07-13 10:10:55 C 21 07 04.114 +34 48 57.60 V T05
2023-07-13 10:15:29 C 21 07 03.787 +34 48 58.25 V T05
2023-07-13 10:22:46 C 21 07 03.281 +34 48 59.65 V T05
2023-07-14 11:32:36 C 21 05 26.983 +34 53 32.35 V T05
2023-07-14 11:35:13 C 21 05 26.782 +34 53 33.22 V T05
2023-07-14 12:27:23 C 21 05 23.266 +34 53 41.53 V T05
2023-07-14 13:08:29 C 21 05 20.520 +34 53 48.41 V T05
2023-07-15 05:36:48 C 21 04 16.865 +34 56 24.94 V W68
2023-07-15 05:57:09 C 21 04 15.518 +34 56 27.64 V W68
2023-07-15 06:05:05 C 21 04 14.966 +34 56 28.57 V W68
2023-07-15 06:07:42 C 21 04 14.789 +34 56 28.68 V W68
2023-07-15 22:00:10 C 21 03 12.82 +34 58 22.5 X M26
2023-07-15 22:05:51 C 21 03 12.42 +34 58 23.6 X M26
2023-07-15 22:11:09 C 21 03 12.06 +34 58 24.2 X M26
2023-07-20 12:10:17 C 20 55 45.290 +35 03 46.66 V T05
2023-07-20 12:19:20 C 20 55 44.678 +35 03 46.19 V T05
2023-07-20 12:22:36 C 20 55 44.429 +35 03 46.40 V T05
2023-07-20 12:23:54 C 20 55 44.335 +35 03 46.51 V T05
2023-07-20 12:27:09 C 20 55 44.095 +35 03 46.19 V T05
2023-07-20 12:34:33 C 20 55 43.589 +35 03 46.66 V T05
2023-07-20 12:42:48 C 20 55 42.958 +35 03 45.72 V T05
2023-07-22 10:43:16 C 20 52 31.183 +35 01 12.61 V T05
2023-07-22 11:10:51 C 20 52 29.117 +35 01 10.42 V T05
2023-07-22 11:15:30 C 20 52 28.836 +35 01 09.84 V T05
2023-07-22 11:16:09 C 20 52 28.716 +35 01 10.20 V T05
2023-07-22 12:02:36 C 20 52 25.258 +35 01 05.81 V T05
2023-07-22 12:43:43 C 20 52 22.322 +35 01 02.06 V T05
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)