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
2019-03-09 05:59:58 C 04 05 37.72 -20 50 28.0 V T08
2019-03-09 06:13:28 C 04 05 38.77 -20 50 25.0 V T08
2019-03-09 06:25:36 C 04 05 39.69 -20 50 22.1 V T08
2019-03-23 05:53:16 C 04 35 17.00 -19 19 00.8 V T05
2019-03-23 06:05:28 C 04 35 18.15 -19 18 56.3 V T05
2019-03-23 06:17:38 C 04 35 19.29 -19 18 51.8 V T05
2019-03-23 06:29:07 C 04 35 20.36 -19 18 47.7 V T05
2019-03-27 05:31:36 C 04 44 49.13 -18 42 04.1 V T05
2019-03-27 05:40:24 C 04 44 49.98 -18 42 00.2 V T05
2019-03-27 05:50:30 C 04 44 51.00 -18 41 55.9 V T05
2019-03-27 06:02:05 C 04 44 52.15 -18 41 50.7 V T05
2019-03-29 05:26:58 C 04 49 48.49 -18 20 47.8 V T08
2019-03-29 05:33:41 C 04 49 49.20 -18 20 44.5 V T08
2019-03-29 05:43:49 C 04 49 50.23 -18 20 39.1 V T08
2019-03-29 05:56:05 C 04 49 51.49 -18 20 33.5 V T08
2019-03-29 15:46:50 C 04 50 54.23 -18 15 56.2 q C97
2019-03-29 15:49:02 C 04 50 54.56 -18 15 55.4 q C97
2019-03-29 15:51:13 C 04 50 54.66 -18 15 54.2 q C97
2019-03-29 15:53:25 C 04 50 54.91 -18 15 52.7 q C97
2019-03-31 05:34:47 C 04 54 58.67 -17 57 13.8 V T05
2019-03-31 05:42:23 C 04 54 59.47 -17 57 09.7 V T05
2019-03-31 05:43:02 C 04 54 59.52 -17 57 09.3 V T05
2019-03-31 05:51:50 C 04 55 00.46 -17 57 04.9 V T05
2019-03-31 05:53:20 C 04 55 00.62 -17 57 03.8 V T05
2019-03-31 06:02:08 C 04 55 01.56 -17 56 59.1 V T05
2019-03-31 06:03:38 C 04 55 01.70 -17 56 58.4 V T05
2019-03-31 06:13:58 C 04 55 02.80 -17 56 52.7 V T05
2019-04-02 05:26:57 C 05 00 17.36 -17 31 18.7 V T08
2019-04-02 05:33:07 C 05 00 18.01 -17 31 14.8 V T08
2019-04-02 05:42:35 C 05 00 19.06 -17 31 09.4 V T08
2019-04-02 05:55:35 C 05 00 20.48 -17 31 01.4 V T08
2019-04-04 05:40:27 C 05 05 49.57 -17 02 20.9 V T05
2019-04-04 05:50:31 C 05 05 50.71 -17 02 14.5 V T05
2019-04-04 06:03:15 C 05 05 52.16 -17 02 06.3 V T05
2019-04-04 06:16:13 C 05 05 53.64 -17 01 57.6 V T05
2019-04-08 05:48:07 C 05 17 30.14 -15 54 28.0 V T05
2019-04-08 06:01:36 C 05 17 31.79 -15 54 17.2 V T05
2019-04-08 06:15:42 C 05 17 33.51 -15 54 05.7 V T05
2019-04-10 05:28:05 C 05 23 39.23 -15 14 50.0 V T08
2019-04-10 05:30:06 C 05 23 39.54 -15 14 48.3 V T08
2019-04-10 05:33:30 C 05 23 39.97 -15 14 45.0 V T08
2019-04-10 05:37:33 C 05 23 40.49 -15 14 41.6 V T08
2019-04-10 05:42:18 C 05 23 41.06 -15 14 37.2 V T08
2019-04-10 05:48:23 C 05 23 41.84 -15 14 31.7 V T08
2019-04-10 05:54:29 C 05 23 42.61 -15 14 26.3 V T08
2019-04-10 06:02:40 C 05 23 43.66 -15 14 19.1 V T08
2019-04-13 07:53:36 C 05 33 49.49 -14 02 54.9 q E89
2019-04-13 08:05:34 C 05 33 51.18 -14 02 41.9 q E89
2019-04-14 15:46:12 C 05 38 24.89 -13 28 29.4 q C97
2019-04-14 15:48:23 C 05 38 25.21 -13 28 26.7 q C97
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)