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
2021-01-31 15:14:07 s 1 +54757.935 0 +357803.15 8720.0 C57
2021-01-31 15:24:07 S 05 27 41.976 -75 56 49.88 V C57
2021-01-31 15:24:07 s 1 +54418.063 0 +358058.01 8950.0 C57
2021-01-31 15:34:07 S 05 27 38.846 -75 57 06.62 V C57
2021-01-31 15:34:07 s 1 +54078.028 0 +358311.78 8850.0 C57
2021-01-31 15:44:07 S 05 27 36.120 -75 57 22.28 V C57
2021-01-31 15:44:07 s 1 +53737.829 0 +358564.46 8390.0 C57
2021-01-31 15:54:07 S 05 27 33.235 -75 57 37.94 V C57
2021-01-31 15:54:07 s 1 +53397.470 0 +358816.07 7600.0 C57
2021-01-31 16:04:07 S 05 27 30.343 -75 57 54.14 V C57
2021-01-31 16:04:07 s 1 +53056.950 0 +359066.59 6470.0 C57
2021-01-31 16:14:07 S 05 27 27.398 -75 58 12.43 V C57
2021-01-31 16:14:07 s 1 +52716.271 0 +359316.03 5000.0 C57
2021-01-31 16:24:07 S 05 27 24.180 -75 58 28.49 V C57
2021-01-31 16:24:07 s 1 +52375.435 0 +359564.40 3190.0 C57
2021-01-31 16:34:07 S 05 27 21.295 -75 58 43.86 V C57
2021-01-31 16:34:07 s 1 +52034.443 0 +359811.68 1060.0 C57
2021-01-31 16:44:07 S 05 27 18.427 -75 59 00.82 V C57
2021-01-31 16:44:07 s 1 +51693.295 0 +360057.88 8590.0 C57
2021-01-31 16:54:07 S 05 27 15.742 -75 59 17.12 V C57
2021-01-31 16:54:07 s 1 +51351.994 0 +360303.01 5800.0 C57
2021-01-31 17:04:07 S 05 27 12.638 -75 59 34.26 V C57
2021-01-31 17:04:07 s 1 +51010.541 0 +360547.07 2680.0 C57
2021-01-31 17:14:07 S 05 27 09.912 -75 59 49.74 V C57
2021-01-31 17:14:07 s 1 +50668.936 0 +360790.04 9230.0 C57
2021-01-31 17:24:07 S 05 27 06.799 -76 00 06.62 V C57
2021-01-31 17:24:07 s 1 +50327.181 0 +361031.95 5470.0 C57
2021-01-31 17:34:07 S 05 27 04.020 -76 00 22.61 V C57
2021-01-31 17:34:07 s 1 +49985.278 0 +361272.78 1390.0 C57
2021-01-31 17:44:07 S 05 27 00.886 -76 00 38.45 V C57
2021-01-31 17:44:07 s 1 +49643.227 0 +361512.54 6990.0 C57
2021-01-31 17:54:07 S 05 26 58.284 -76 00 56.23 V C57
2021-01-31 17:54:07 s 1 +49301.030 0 +361751.23 2270.0 C57
2021-01-31 18:04:07 S 05 26 54.989 -76 01 11.68 V C57
2021-01-31 18:04:07 s 1 +48958.688 0 +361988.85 7240.0 C57
2021-01-31 18:14:07 S 05 26 52.022 -76 01 28.60 V C57
2021-01-31 18:14:07 s 1 +48616.203 0 +362225.40 1910.0 C57
2021-01-31 18:24:07 S 05 26 49.296 -76 01 44.62 V C57
2021-01-31 18:24:07 s 1 +48273.575 0 +362460.88 6260.0 C57
2021-01-31 18:34:07 S 05 26 46.229 -76 02 02.08 V C57
2021-01-31 18:34:07 s 1 +47930.805 0 +362695.29 310.0 C57
2021-01-31 18:44:07 S 05 26 43.210 -76 02 17.63 V C57
2021-01-31 18:44:07 s 1 +47587.896 0 +362928.64 4060.0 C57
2021-01-31 18:54:07 S 05 26 40.433 -76 02 33.72 V C57
2021-01-31 18:54:07 s 1 +47244.848 0 +363160.93 7500.0 C57
2021-01-31 19:04:07 S 05 26 37.159 -76 02 50.03 V C57
2021-01-31 19:04:07 s 1 +46901.662 0 +363392.15 650.0 C57
2021-01-31 19:14:07 S 05 26 34.608 -76 03 04.79 V C57
2021-01-31 19:14:07 s 1 +46558.340 0 +363622.30 3500.0 C57
2021-01-31 19:24:07 S 05 26 31.733 -76 03 23.65 V 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)