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
2017-08-02 01:52:46 C 14 18 58.13 +11 36 05.2 q I15
2017-08-02 01:56:58 C 14 18 58.79 +11 36 03.4 q I15
2017-08-02 02:03:40 C 14 18 59.89 +11 36 00.2 q I15
2017-08-06 05:53:07 C 14 34 48.67 +10 54 59.8 L T05
2017-08-06 05:53:50 C 14 34 48.80 +10 54 59.5 L T05
2017-08-06 06:09:18 C 14 34 51.16 +10 54 53.4 L T05
2017-08-06 06:10:00 C 14 34 51.28 +10 54 53.0 L T05
2017-08-12 05:58:24 C 14 56 25.66 +09 52 29.5 L T08
2017-08-12 05:59:09 C 14 56 25.80 +09 52 29.0 L T08
2017-08-12 06:00:38 C 14 56 26.01 +09 52 28.8 L T08
2017-08-12 06:14:03 C 14 56 27.90 +09 52 22.4 L T08
2017-08-14 05:54:54 C 15 03 20.17 +09 31 06.2 L T05
2017-08-14 05:57:07 C 15 03 20.50 +09 31 05.9 L T05
2017-08-14 06:10:01 C 15 03 22.27 +09 31 00.3 L T05
2017-08-14 06:23:09 C 15 03 24.13 +09 30 54.3 L T05
2017-08-14 20:34:38 C 15 05 25.31 +09 24 28.7 q B04
2017-08-14 20:41:24 C 15 05 26.27 +09 24 25.9 q B04
2017-08-14 20:48:01 C 15 05 27.24 +09 24 22.9 q B04
2017-08-17 06:37:25 C 15 13 34.05 +08 58 21.4 L T05
2017-08-17 06:50:30 C 15 13 35.84 +08 58 15.9 L T05
2017-08-17 07:02:44 C 15 13 37.51 +08 58 10.1 L T05
2017-08-17 07:15:48 C 15 13 39.31 +08 58 04.2 L T05
2017-08-17 19:33:29 C 15 15 21.57 +08 52 27.6 q 160
2017-08-17 19:36:29 C 15 15 21.99 +08 52 26.0 q 160
2017-08-17 19:39:25 C 15 15 22.42 +08 52 24.5 q 160
2017-08-18 19:14:44 C 15 18 37.16 +08 41 42.2 q 160
2017-08-18 19:17:43 C 15 18 37.48 +08 41 42.0 q 160
2017-08-18 19:20:42 C 15 18 37.87 +08 41 40.5 q 160
2017-08-21 19:17:51 C 15 28 21.94 +08 08 57.6 q 160
2017-08-21 19:20:47 C 15 28 22.23 +08 08 57.4 q 160
2017-08-21 19:23:45 C 15 28 22.64 +08 08 55.8 q 160
2017-08-22 19:41:38 C 15 31 36.55 +07 57 53.0 q 160
2017-08-22 19:44:14 C 15 31 36.89 +07 57 51.6 q 160
2017-08-22 19:46:51 C 15 31 37.22 +07 57 50.3 q 160
2017-08-30 19:18:57 C 15 56 15.30 +06 31 38.9 q 160
2017-08-30 19:21:20 C 15 56 15.63 +06 31 37.6 q 160
2017-08-30 19:24:09 C 15 56 16.04 +06 31 36.0 q 160
2017-09-02 05:45:58 C 16 03 30.19 +06 05 55.4 L T05
2017-09-02 05:47:25 C 16 03 30.40 +06 05 54.9 L T05
2017-09-02 05:51:44 C 16 03 30.91 +06 05 52.7 L T05
2017-09-02 05:54:41 C 16 03 31.27 +06 05 51.4 L T05
2017-09-02 05:59:09 C 16 03 31.81 +06 05 49.9 L T05
2017-09-02 06:03:29 C 16 03 32.31 +06 05 47.4 L T05
2017-09-02 06:09:25 C 16 03 33.05 +06 05 44.7 L T05
2017-09-26 05:24:16 C 17 09 57.52 +02 18 44.7 L T05
2017-09-26 05:29:41 C 17 09 58.20 +02 18 43.5 L T05
2017-09-26 05:37:15 C 17 09 58.97 +02 18 40.4 L T05
2017-09-26 05:46:47 C 17 09 59.96 +02 18 37.8 L T05
2018-09-09 10:24:33 C 04 24 43.06 +23 41 28.8 V G96
2018-09-09 10:31:55 C 04 24 43.42 +23 41 27.2 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)