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
2012-12-03 20:31:51 C 00 24 03.93 +06 51 48.4 c A24
2012-12-03 20:51:23 C 00 24 04.03 +06 51 36.8 c A24
2012-12-03 20:53:26 C 00 24 04.07 +06 51 36.2 c A24
2012-12-05 02:36:04 C 00 24 19.94 +06 36 23.1 r 703
2012-12-05 02:44:53 C 00 24 20.05 +06 36 19.2 r 703
2012-12-05 02:53:45 C 00 24 20.12 +06 36 14.0 r 703
2012-12-05 03:02:39 C 00 24 20.26 +06 36 08.7 r 703
2012-12-05 04:36:42 C 00 24 20.96 +06 35 22.7 19.4 c 704
2012-12-05 04:55:28 C 00 24 21.20 +06 35 12.6 19.6 c 704
2012-12-05 05:14:13 C 00 24 21.33 +06 35 03.9 19.4 c 704
2012-12-05 05:33:04 C 00 24 21.49 +06 34 53.2 19.6 c 704
2012-12-05 05:51:48 C 00 24 21.63 +06 34 45.2 19.5 c 704
2012-12-05 18:48:35 C 00 24 29.98 +06 28 18.8 c A24
2012-12-05 18:50:40 C 00 24 29.97 +06 28 17.0 c A24
2012-12-05 19:05:38 C 00 24 30.15 +06 28 09.8 c A24
2012-12-05 19:09:55 C 00 24 30.17 +06 28 06.6 c A24
2012-12-09 19:11:50 C 00 25 49.21 +05 43 57.7 c A24
2012-12-09 19:12:52 C 00 25 49.10 +05 43 57.3 c A24
2012-12-09 19:14:57 C 00 25 49.16 +05 43 56.1 c A24
2012-12-15 18:10:52 C 00 28 45.50 +04 49 06.8 q B88
2012-12-15 18:44:24 C 00 28 46.37 +04 48 56.4 q B88
2012-12-15 19:17:56 C 00 28 47.08 +04 48 43.6 q B88
2013-01-07 01:40:07 C 00 48 33.01 +03 03 03.3 r 703
2013-01-07 01:47:22 C 00 48 33.48 +03 03 03.2 r 703
2013-01-07 01:54:39 C 00 48 33.80 +03 03 03.6 r 703
2013-01-07 02:02:57 C 00 48 34.20 +03 03 03.4 r 703
2013-01-14 01:53:44 C 00 57 07.74 +02 55 41.8 r 703
2013-01-14 02:01:28 C 00 57 08.13 +02 55 41.2 r 703
2013-01-14 02:09:18 C 00 57 08.60 +02 55 41.5 r 703
2013-01-14 02:17:07 C 00 57 09.00 +02 55 41.7 r 703
2013-02-05 05:35:21 C 01 30 03.918 +03 27 47.17 L F51
2013-02-05 05:43:17 C 01 30 04.467 +03 27 48.05 L F51
2013-02-05 05:51:12 C 01 30 05.002 +03 27 48.97 L F51
2013-02-05 05:59:09 C 01 30 05.549 +03 27 49.91 L F51
2014-09-20 09:26:39 C 02 35 53.36 +28 01 41.2 u H21
2014-09-20 09:29:07 C 02 35 53.30 +28 01 40.5 u H21
2014-09-20 09:31:44 C 02 35 53.25 +28 01 39.9 u H21
2014-09-24 00:51:52 C 02 33 52.51 +27 35 11.2 c A24
2014-09-24 00:52:54 C 02 33 52.51 +27 35 12.2 c A24
2014-09-24 00:53:56 C 02 33 52.44 +27 35 12.0 c A24
2014-09-24 00:54:58 C 02 33 52.39 +27 35 11.0 c A24
2014-09-24 01:51:15 C 02 33 50.86 +27 34 52.7 c A24
2014-09-24 01:52:17 C 02 33 50.79 +27 34 52.8 c A24
2014-09-24 01:53:19 C 02 33 50.83 +27 34 52.7 c A24
2014-09-24 01:54:21 C 02 33 50.80 +27 34 51.7 c A24
2014-09-25 06:05:30 C 02 33 04.68 +27 25 09.2 q 703
2014-09-25 06:29:09 C 02 33 03.94 +27 25 00.9 q 703
2014-09-25 06:52:50 C 02 33 03.24 +27 24 52.9 q 703
2014-09-25 07:16:28 C 02 33 02.56 +27 24 44.5 q 703
2014-10-03 08:46:35 C 02 26 07.40 +26 01 22.7 q 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)