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
2018-11-29 18:14:39 s 1 +141709.84 9 +76385.040 7920.0 C57
2018-11-29 18:44:39 S 04 11 18.605 -06 16 58.08 V C57
2018-11-29 18:44:39 s 1 +142022.34 2 +79232.380 7880.0 C57
2018-11-29 19:14:39 S 04 11 16.099 -06 17 44.84 V C57
2018-11-29 19:14:39 s 1 +142306.81 1 +82064.073 5400.0 C57
2018-11-29 19:44:39 S 04 11 13.608 -06 18 32.72 V C57
2018-11-29 19:44:39 s 1 +142563.94 7 +84879.990 4330.0 C57
2018-11-29 20:14:39 S 04 11 11.016 -06 19 18.48 V C57
2018-11-29 20:14:39 s 1 +142794.42 0 +87680.018 8410.0 C57
2018-11-29 21:14:39 S 04 11 05.969 -06 20 54.28 V C57
2018-11-29 21:14:39 s 1 +143177.96 0 +93232.026 6540.0 C57
2018-11-29 21:44:39 S 04 11 03.588 -06 21 39.92 V C57
2018-11-29 21:44:39 s 1 +143332.26 7 +95983.846 7590.0 C57
2018-11-29 22:14:39 S 04 11 00.962 -06 22 27.41 V C57
2018-11-29 22:14:39 s 1 +143462.39 5 +98719.456 7800.0 C57
2018-11-29 22:44:39 S 04 10 58.529 -06 23 12.41 V C57
2018-11-29 22:44:39 s 1 +143568.91 8 +101438.80 440.0 C57
2018-11-29 23:14:39 S 04 10 55.937 -06 24 01.37 V C57
2018-11-29 23:14:39 s 1 +143652.39 5 +104141.84 8710.0 C57
2018-11-29 23:44:39 S 04 10 53.381 -06 24 47.70 V C57
2018-11-29 23:44:39 s 1 +143713.36 6 +106828.55 5680.0 C57
2018-11-30 00:14:39 S 04 10 50.899 -06 25 34.07 V C57
2018-11-30 00:14:39 s 1 +143752.35 5 +109498.90 4380.0 C57
2018-11-30 00:44:39 S 04 10 48.420 -06 26 21.34 V C57
2018-11-30 00:44:39 s 1 +143769.87 2 +112152.86 7740.0 C57
2018-11-30 01:14:39 S 04 10 45.859 -06 27 06.73 V C57
2018-11-30 01:14:39 s 1 +143766.41 2 +114790.44 8620.0 C57
2018-11-30 01:44:39 S 04 10 43.392 -06 27 51.77 V C57
2018-11-30 01:44:39 s 1 +143742.45 4 +117411.63 9790.0 C57
2018-11-30 02:14:39 S 04 10 40.814 -06 28 38.46 V C57
2018-11-30 02:14:39 s 1 +143698.46 4 +120016.42 3960.0 C57
2018-11-30 02:44:39 S 04 10 38.162 -06 29 27.49 V C57
2018-11-30 02:44:39 s 1 +143634.89 5 +122604.84 3780.0 C57
2018-11-30 03:14:39 S 04 10 35.748 -06 30 11.02 V C57
2018-11-30 03:14:39 s 1 +143552.18 6 +125176.89 1800.0 C57
2018-11-30 03:44:39 S 04 10 33.182 -06 30 58.79 V C57
2018-11-30 03:44:39 s 1 +143450.76 4 +127732.59 520.0 C57
2018-11-30 04:14:39 S 04 10 30.646 -06 31 45.23 V C57
2018-11-30 04:14:39 s 1 +143331.04 5 +130271.96 2400.0 C57
2018-11-30 04:44:39 S 04 10 28.025 -06 32 31.74 V C57
2018-11-30 04:44:39 s 1 +143193.43 2 +132795.04 9790.0 C57
2018-11-30 05:14:39 S 04 10 25.519 -06 33 16.63 V C57
2018-11-30 05:14:39 s 1 +143038.31 6 +135301.86 5010.0 C57
2018-11-30 05:44:39 S 04 10 22.973 -06 34 03.68 V C57
2018-11-30 05:44:39 s 1 +142866.07 9 +137792.44 320.0 C57
2018-11-30 06:14:39 S 04 10 20.328 -06 34 49.58 V C57
2018-11-30 06:14:39 s 1 +142677.09 1 +140266.83 0.791 C57
2018-11-30 06:44:39 S 04 10 17.930 -06 35 34.62 V C57
2018-11-30 06:44:39 s 1 +142471.71 4 +142725.07 0.993 C57
2018-11-30 07:14:39 S 04 10 15.317 -06 36 22.14 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)