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
2008-09-23 04:45:03 C 23 30 51.08 +27 51 40.9 r 703
2008-09-23 04:57:45 C 23 30 50.36 +27 51 32.6 r 703
2008-09-23 05:10:26 C 23 30 49.57 +27 51 23.5 r 703
2008-09-30 06:16:10 C 23 21 26.60 +25 41 17.6 r 703
2008-09-30 06:21:21 C 23 21 26.24 +25 41 12.7 r 703
2008-09-30 06:26:33 C 23 21 25.99 +25 41 08.2 r 703
2008-09-30 06:31:44 C 23 21 25.59 +25 41 03.9 r 703
2008-10-03 05:11:49 C 23 17 49.75 +24 41 58.6 19.0 c 704
2008-10-03 05:29:30 C 23 17 48.82 +24 41 43.2 19.0 c 704
2008-10-03 05:47:22 C 23 17 47.95 +24 41 28.3 19.1 c 704
2008-10-03 06:04:52 C 23 17 47.05 +24 41 12.9 19.3 c 704
2008-10-03 06:22:30 C 23 17 46.17 +24 40 58.0 19.8 c 704
2008-10-27 04:33:55 C 22 59 24.80 +16 16 56.3 18.8 c 704
2008-10-27 04:50:42 C 22 59 24.57 +16 16 43.0 19.0 c 704
2008-10-27 05:07:31 C 22 59 24.36 +16 16 27.5 19.5 c 704
2008-10-27 05:24:55 C 22 59 24.02 +16 16 14.7 19.4 c 704
2008-10-27 05:42:33 C 22 59 23.79 +16 15 59.3 19.1 c 704
2008-11-07 02:25:16 C 22 58 15.16 +12 56 31.0 r 703
2008-11-07 02:41:54 C 22 58 15.16 +12 56 21.1 r 703
2008-11-07 02:58:38 C 22 58 15.20 +12 56 09.4 r 703
2008-11-07 03:15:27 C 22 58 15.42 +12 55 57.6 r 703
2008-11-21 02:11:23 C 23 02 43.72 +09 34 35.3 r 703
2008-11-21 02:22:41 C 23 02 44.12 +09 34 28.4 r 703
2008-11-21 02:33:46 C 23 02 44.34 +09 34 23.9 r 703
2008-11-21 02:45:01 C 23 02 44.55 +09 34 18.2 r 703
2008-11-22 03:35:41 C 23 03 18.42 +09 21 56.0 19.7 c 704
2008-11-22 03:54:33 C 23 03 18.79 +09 21 46.9 19.8 c 704
2008-11-22 04:13:10 C 23 03 19.24 +09 21 38.3 19.7 c 704
2008-11-22 04:31:20 C 23 03 19.68 +09 21 31.0 20.4 c 704
2008-12-30 02:55:03 C 23 40 29.35 +05 26 14.5 r 703
2008-12-30 03:03:43 C 23 40 29.92 +05 26 13.5 r 703
2008-12-30 03:12:18 C 23 40 30.36 +05 26 12.8 r 703
2010-07-16 13:14:45 S 00 54 21.451 +28 38 35.27 L C51
2010-07-16 16:25:16 S 00 54 26.887 +28 39 41.76 L C51
2010-07-16 21:10:57 S 00 54 35.72 +28 41 19.9 L C51
2010-07-17 00:21:28 S 00 54 41.44 +28 42 22.6 L C51
2010-07-17 05:07:09 S 00 54 49.800 +28 44 00.85 L C51
2010-07-17 06:42:30 S 00 54 52.57 +28 44 33.2 L C51
2010-07-17 16:14:03 S 00 55 09.230 +28 47 47.29 L C51
2010-07-17 19:24:34 S 00 55 14.988 +28 48 50.29 L C51
2010-07-27 12:45:32 C 01 00 51.335 +30 01 15.56 L F51
2010-07-27 13:00:47 C 01 00 51.605 +30 01 19.97 L F51
2010-09-12 23:29:43 C 00 44 38.65 +30 45 09.1 u 160
2010-09-12 23:33:40 C 00 44 38.44 +30 45 08.0 u 160
2010-09-12 23:37:40 C 00 44 38.26 +30 45 06.4 u 160
2010-09-13 12:20:34 C 00 44 00.341 +30 40 52.50 L F51
2010-09-13 12:37:48 C 00 43 59.452 +30 40 46.54 L F51
2010-09-16 00:15:10 C 00 40 56.56 +30 18 45.1 r 130
2010-09-16 00:19:53 C 00 40 56.31 +30 18 42.7 r 130
2010-09-16 00:25:16 C 00 40 56.06 +30 18 41.0 r 130
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)