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
2021-07-02 09:04:00 s 1 -57705.534 0 +398606.47 650.0 C57
2021-07-02 09:04:11 C 19 20 59.41 +37 36 23.0 q U69
2021-07-02 09:14:00 S 19 20 43.654 +37 27 06.41 V C57
2021-07-02 09:14:00 s 1 -58055.343 0 +398513.53 3220.0 C57
2021-07-02 09:24:00 S 19 20 42.727 +37 27 03.24 V C57
2021-07-02 09:24:00 s 1 -58405.032 0 +398419.72 5310.0 C57
2021-07-02 09:44:00 S 19 20 41.698 +37 26 59.50 V C57
2021-07-02 09:44:00 s 1 -59104.049 0 +398229.50 8000.0 C57
2021-07-02 10:04:00 S 19 20 40.123 +37 26 57.80 V C57
2021-07-02 10:04:00 s 1 -59802.577 0 +398035.81 8690.0 C57
2021-07-02 10:14:00 S 19 20 39.456 +37 26 58.06 V C57
2021-07-02 10:14:00 s 1 -60151.656 0 +397937.66 8280.0 C57
2021-07-02 10:34:00 S 19 20 38.033 +37 26 52.58 V C57
2021-07-02 10:34:00 s 1 -60849.440 0 +397738.75 5950.0 C57
2021-07-02 12:24:00 S 19 20 29.566 +37 26 43.30 V C57
2021-07-02 12:24:00 s 1 -64678.060 0 +396582.62 6090.0 C57
2021-07-02 14:04:00 S 19 20 23.021 +37 26 28.03 V C57
2021-07-02 14:04:00 s 1 -68144.459 0 +395440.30 4420.0 C57
2021-07-02 14:54:00 S 19 20 19.003 +37 26 23.39 V C57
2021-07-02 14:54:00 s 1 -69872.329 0 +394836.51 2670.0 C57
2021-07-02 15:04:00 S 19 20 18.370 +37 26 23.06 V C57
2021-07-02 15:04:00 s 1 -70217.464 0 +394713.14 6610.0 C57
2021-07-02 15:14:00 S 19 20 17.642 +37 26 21.23 V C57
2021-07-02 15:14:00 s 1 -70562.449 0 +394588.89 9960.0 C57
2021-07-02 15:24:00 S 19 20 16.882 +37 26 20.54 V C57
2021-07-02 15:24:00 s 1 -70907.286 0 +394463.78 2740.0 C57
2021-07-02 15:34:00 S 19 20 16.315 +37 26 18.53 V C57
2021-07-02 15:34:00 s 1 -71251.972 0 +394337.80 4940.0 C57
2021-07-02 15:44:00 S 19 20 15.413 +37 26 16.01 V C57
2021-07-02 15:44:00 s 1 -71596.507 0 +394210.95 6560.0 C57
2021-07-02 15:54:00 S 19 20 14.724 +37 26 15.04 V C57
2021-07-02 15:54:00 s 1 -71940.891 0 +394083.22 7580.0 C57
2021-07-02 16:04:00 S 19 20 14.160 +37 26 15.11 V C57
2021-07-02 16:04:00 s 1 -72285.121 0 +393954.62 8020.0 C57
2021-07-02 16:14:00 S 19 20 13.315 +37 26 11.15 V C57
2021-07-02 16:14:00 s 1 -72629.198 0 +393825.16 7870.0 C57
2021-07-02 16:24:00 S 19 20 12.262 +37 26 13.02 V C57
2021-07-02 16:24:00 s 1 -72973.121 0 +393694.82 7120.0 C57
2021-07-02 16:34:00 S 19 20 12.206 +37 26 08.92 V C57
2021-07-02 16:34:00 s 1 -73316.888 0 +393563.61 5770.0 C57
2021-07-02 16:44:00 S 19 20 11.119 +37 26 10.86 V C57
2021-07-02 16:44:00 s 1 -73660.499 0 +393431.53 3830.0 C57
2021-07-02 16:54:00 S 19 20 10.289 +37 26 11.72 V C57
2021-07-02 16:54:00 s 1 -74003.953 0 +393298.57 1280.0 C57
2021-07-02 17:04:00 S 19 20 09.590 +37 26 00.28 V C57
2021-07-02 17:04:00 s 1 -74347.249 0 +393164.75 8130.0 C57
2021-07-02 17:14:00 S 19 20 09.122 +37 26 04.67 V C57
2021-07-02 17:14:00 s 1 -74690.387 0 +393030.05 4370.0 C57
2021-07-02 17:24:00 S 19 20 08.467 +37 26 01.00 V C57
2021-07-02 17:24:00 s 1 -75033.364 0 +392894.48 10.0 C57
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)