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
2016-11-24 03:29:07 C 02 29 36.98 +04 34 16.9 V G45
2016-11-24 04:27:41 C 02 29 33.17 +04 33 14.2 V G45
2016-11-24 04:27:52 C 02 29 33.17 +04 33 14.2 V G45
2016-11-24 05:23:19 C 02 29 29.55 +04 32 14.9 V G45
2016-11-24 10:05:05 C 02 29 11.69 +04 27 16.3 L T05
2016-11-24 10:27:15 C 02 29 10.22 +04 26 52.8 L T05
2016-11-24 10:50:21 C 02 29 08.75 +04 26 27.9 L T05
2016-11-24 11:13:14 C 02 29 07.27 +04 26 04.6 L T05
2016-11-25 05:35:02 C 02 27 59.62 +04 06 35.7 q G96
2016-11-25 05:41:15 C 02 27 59.22 +04 06 28.9 q G96
2016-11-25 05:47:30 C 02 27 58.83 +04 06 22.6 q G96
2016-11-25 05:53:44 C 02 27 58.43 +04 06 15.9 q G96
2016-11-29 23:30:30 C 02 21 24.78 +02 11 18.9 q 160
2016-11-29 23:32:41 C 02 21 24.69 +02 11 17.1 q 160
2016-11-29 23:34:39 C 02 21 24.57 +02 11 15.2 q 160
2016-11-30 07:16:05 C 02 20 59.78 +02 03 51.8 R G45
2016-11-30 07:23:07 C 02 20 59.39 +02 03 45.2 R G45
2016-11-30 07:29:50 C 02 20 59.01 +02 03 38.7 R G45
2016-11-30 07:44:19 C 02 20 58.21 +02 03 24.7 R G45
2016-11-30 23:31:13 C 02 20 08.31 +01 48 21.4 q 160
2016-12-01 08:08:38 C 02 19 41.42 +01 40 14.0 q H15
2016-12-01 08:22:28 C 02 19 40.68 +01 40 01.0 q H15
2016-12-01 08:36:29 C 02 19 39.90 +01 39 48.2 q H15
2016-12-05 22:19:33 C 02 14 29.65 +00 02 16.6 q 160
2016-12-05 22:23:25 C 02 14 29.48 +00 02 13.5 q 160
2016-12-05 22:27:11 C 02 14 29.29 +00 02 10.0 q 160
2016-12-08 21:27:00 C 02 11 40.05 -00 54 48.5 q 160
2016-12-08 21:30:22 C 02 11 39.93 -00 54 51.2 q 160
2016-12-08 21:33:37 C 02 11 39.80 -00 54 53.7 q 160
2016-12-12 21:50:23 C 02 08 31.62 -02 04 15.3 q 160
2016-12-12 21:52:16 C 02 08 31.60 -02 04 16.6 q 160
2016-12-12 21:55:04 C 02 08 31.50 -02 04 18.7 q 160
2016-12-14 08:19:07 C 02 07 35.99 -02 26 50.5 L T05
2016-12-14 08:37:56 C 02 07 35.55 -02 27 02.3 L T05
2016-12-14 09:13:24 C 02 07 34.50 -02 27 23.9 L T05
2016-12-14 09:32:11 C 02 07 33.94 -02 27 36.1 L T05
2016-12-15 22:27:25 C 02 06 41.71 -02 50 34.4 q 160
2016-12-15 22:30:25 C 02 06 41.64 -02 50 36.2 q 160
2016-12-15 22:33:26 C 02 06 41.59 -02 50 37.9 q 160
2016-12-17 21:33:58 C 02 05 45.28 -03 17 54.2 q 160
2016-12-17 21:36:57 C 02 05 45.21 -03 17 56.0 q 160
2016-12-17 21:39:57 C 02 05 45.15 -03 17 58.0 q 160
2016-12-18 21:21:37 C 02 05 21.11 -03 30 55.4 q 160
2016-12-18 21:24:52 C 02 05 21.06 -03 30 56.8 q 160
2016-12-18 21:28:38 C 02 05 20.98 -03 30 59.1 q 160
2016-12-21 08:09:20 C 02 04 33.89 -04 00 46.7 L T05
2016-12-21 08:26:25 C 02 04 33.67 -04 00 54.3 L T05
2016-12-21 08:45:48 C 02 04 33.40 -04 01 04.2 L T05
2016-12-21 09:04:25 C 02 04 33.20 -04 01 13.0 L T05
2016-12-22 07:56:52 C 02 04 19.89 -04 11 59.6 L 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)