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
2019-07-11 05:20:17 C 15 39 38.74 +30 06 47.3 V 719
2019-07-11 05:41:23 C 15 39 40.75 +30 06 27.6 V 719
2019-07-11 08:21:58 C 15 39 56.300 +30 04 08.86 U F52
2019-07-11 08:39:33 C 15 39 57.895 +30 03 53.01 U F52
2019-07-11 08:57:08 C 15 39 59.558 +30 03 37.06 U F52
2019-07-11 09:14:49 C 15 40 01.195 +30 03 21.01 U F52
2019-07-12 03:18:53 C 15 41 45.62 +29 47 09.8 q W19
2019-07-12 03:25:20 C 15 41 46.20 +29 47 04.4 q W19
2019-07-12 03:32:30 C 15 41 46.84 +29 46 57.6 q W19
2019-07-12 03:41:30 C 15 41 47.69 +29 46 49.5 q W19
2019-07-12 21:33:16 C 15 43 29.31 +29 30 54.6 V K19
2019-07-12 21:48:28 C 15 43 30.75 +29 30 40.9 V K19
2019-07-12 22:03:41 C 15 43 32.08 +29 30 26.9 V K19
2019-07-13 09:01:26 C 15 44 33.72 +29 20 47.1 V T08
2019-07-13 09:10:33 C 15 44 34.51 +29 20 38.8 V T08
2019-07-13 09:14:37 C 15 44 34.87 +29 20 35.0 V T08
2019-07-13 09:35:35 C 15 44 36.79 +29 20 15.8 V T08
2019-07-14 21:21:15 C 15 47 55.92 +28 48 23.5 d Z35
2019-07-14 21:31:46 C 15 47 56.84 +28 48 15.2 q Z45
2019-07-14 21:39:37 C 15 47 57.53 +28 48 08.1 q Z45
2019-07-14 21:46:20 C 15 47 58.11 +28 48 02.0 q Z45
2019-07-14 21:55:16 C 15 47 58.93 +28 47 52.8 d Z35
2019-07-14 22:29:01 C 15 48 01.87 +28 47 22.0 d Z35
2019-07-14 22:32:24 C 15 48 02.14 +28 47 19.6 V J27
2019-07-14 22:39:37 C 15 48 02.81 +28 47 13.3 V J27
2019-07-14 22:58:17 C 15 48 04.44 +28 46 56.1 V J27
2019-07-15 06:12:23 C 15 48 43.94 +28 40 31.6 V 719
2019-07-15 06:46:30 C 15 48 47.01 +28 40 01.9 V 719
2019-07-15 07:24:55 C 15 48 50.99 +28 39 31.6 V T05
2019-07-15 07:33:04 C 15 48 51.69 +28 39 24.4 V T05
2019-07-15 07:37:50 C 15 48 52.11 +28 39 20.1 V T05
2019-07-15 07:53:44 C 15 48 53.49 +28 39 05.9 V T05
2019-07-15 22:37:47 C 15 50 13.50 +28 25 54.8 d Z35
2019-07-15 23:11:09 C 15 50 16.16 +28 25 26.9 d Z35
2019-07-15 23:26:53 C 15 50 17.81 +28 25 11.6 d Z35
2019-07-15 23:45:19 C 15 50 19.28 +28 24 54.8 d Z35
2019-07-15 23:47:41 C 15 50 19.54 +28 24 53.0 d Z35
2019-07-16 00:06:40 C 15 50 21.23 +28 24 35.7 d Z35
2019-07-16 22:34:02 n 15 52 22.36 +28 04 39.2 V Z43
2019-07-16 22:46:35 n 15 52 23.44 +28 04 27.8 V Z43
2019-07-16 22:59:03 n 15 52 24.54 +28 04 16.9 V Z43
2019-07-16 23:11:38 n 15 52 25.61 +28 04 05.1 V Z43
2019-07-16 23:12:40 C 15 52 25.47 +28 04 06.3 d Z35
2019-07-16 23:23:00 C 15 52 26.57 +28 03 54.6 V Z43
2019-07-17 00:05:13 C 15 52 30.18 +28 03 16.9 d Z35
2019-07-17 00:38:17 C 15 52 33.10 +28 02 47.3 d Z35
2019-07-17 10:56:06 C 15 53 27.82 +27 53 45.5 V T08
2019-07-17 11:01:26 C 15 53 28.26 +27 53 40.0 V T08
2019-07-17 11:15:57 C 15 53 29.48 +27 53 27.1 V T08
2019-07-17 11:25:56 C 15 53 30.34 +27 53 17.8 V T08
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)