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
2023-07-23 06:35:01 C 20 51 07.49 +34 59 12.4 V W16
2023-07-23 06:47:32 C 20 51 06.58 +34 59 10.8 V W16
2023-07-23 06:59:36 C 20 51 05.70 +34 59 09.6 V W16
2023-07-23 07:11:15 C 20 51 04.85 +34 59 08.1 V W16
2023-07-26 11:06:08 C 20 45 44.287 +34 46 47.32 V T05
2023-07-26 11:48:38 C 20 45 41.148 +34 46 37.85 V T05
2023-07-26 11:58:37 C 20 45 40.411 +34 46 35.72 V T05
2023-08-03 10:42:17 C 20 32 31.603 +33 42 47.05 V T05
2023-08-03 10:47:30 C 20 32 31.270 +33 42 44.86 V T05
2023-08-03 11:18:41 C 20 32 29.114 +33 42 30.89 V T05
2023-08-08 20:17:50 C 20 24 15.87 +32 34 55.7 q L47
2023-08-08 20:27:08 C 20 24 15.30 +32 34 50.6 q L47
2023-08-14 21:08:34 C 20 16 04.68 +30 59 06.7 X C95
2023-08-14 21:16:14 C 20 16 04.31 +30 59 01.1 X C95
2023-08-14 21:23:56 C 20 16 03.89 +30 58 55.4 X C95
2023-08-17 09:37:47 C 20 13 03.799 +30 13 52.21 V T05
2023-08-17 09:42:32 C 20 13 03.559 +30 13 48.79 V T05
2023-08-17 09:50:21 C 20 13 03.187 +30 13 42.74 V T05
2023-08-20 21:53:15 C 20 09 19.01 +29 06 29.2 X M26
2023-08-20 22:01:35 C 20 09 18.67 +29 06 22.3 X M26
2023-08-20 22:09:54 C 20 09 18.29 +29 06 15.4 X M26
2023-08-21 19:53:52 C 20 08 25.87 +28 48 11.3 V 130
2023-08-21 19:58:10 C 20 08 25.69 +28 48 07.9 V 130
2023-08-21 20:08:12 C 20 08 25.26 +28 47 59.9 V 130
2023-08-24 21:57:09 C 20 05 42.763 +27 44 55.28 X L43
2023-08-24 22:43:07 C 20 05 41.136 +27 44 15.11 X L43
2023-08-24 23:30:33 C 20 05 39.434 +27 43 33.53 X L43
2023-08-27 09:14:56 C 20 03 50.957 +26 52 41.27 V T05
2023-08-27 09:19:01 C 20 03 50.832 +26 52 37.31 V T05
2023-08-27 09:27:02 C 20 03 50.582 +26 52 30.47 V T05
2023-08-27 09:43:34 C 20 03 50.033 +26 52 15.38 V T05
2023-08-29 09:00:46 C 20 02 33.216 +26 09 46.55 V T05
2023-08-29 09:05:20 C 20 02 33.110 +26 09 42.55 V T05
2023-08-29 09:13:49 C 20 02 32.882 +26 09 34.63 V T05
2023-08-29 09:28:10 C 20 02 32.462 +26 09 21.71 V T05
2023-09-06 20:15:44 B 19 59 01.68 +23 03 01.0 V L65
2023-09-06 20:21:56 B 19 59 01.63 +23 02 54.7 V L65
2023-09-06 20:28:09 B 19 59 01.53 +23 02 49.6 V L65
2023-09-08 20:16:52 B 19 58 39.031 +22 18 42.01 V L65
2023-09-08 20:25:09 B 19 58 38.947 +22 18 34.27 V L65
2023-09-08 20:33:25 B 19 58 38.880 +22 18 26.78 V L65
2023-09-10 08:00:01 C 19 58 28.598 +21 45 54.94 V T05
2023-09-10 08:04:07 C 19 58 28.601 +21 45 51.77 V T05
2023-09-10 08:13:03 C 19 58 28.505 +21 45 43.67 V T05
2023-09-10 08:29:41 C 19 58 28.469 +21 45 28.08 V T05
2023-11-05 01:51:59 C 20 41 05.424 +06 46 04.40 V G96
2023-11-05 02:00:12 C 20 41 05.867 +06 46 01.38 V G96
2023-11-05 02:08:24 C 20 41 06.328 +06 45 58.18 V G96
2023-11-05 02:16:38 C 20 41 06.767 +06 45 55.15 V G96
2023-11-06 01:54:11 C 20 42 26.255 +06 37 16.43 V G96
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)