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
2018-12-02 08:44:39 s 1 +75325.684 0 +317220.42 1780.0 C57
2018-12-02 09:14:39 S 04 05 56.316 -07 50 42.40 V C57
2018-12-02 09:14:39 s 1 +74402.718 0 +318348.31 9630.0 C57
2018-12-02 09:44:39 S 04 05 53.690 -07 51 26.53 V C57
2018-12-02 09:44:39 s 1 +73477.356 0 +319465.55 30.0 C57
2018-12-02 10:14:39 S 04 05 51.034 -07 52 09.30 V C57
2018-12-02 10:14:39 s 1 +72549.646 0 +320572.15 3300.0 C57
2018-12-02 10:44:39 S 04 05 48.439 -07 52 53.29 V C57
2018-12-02 10:44:39 s 1 +71619.636 0 +321668.16 9760.0 C57
2018-12-02 11:12:47 C 04 05 59.45 -07 49 05.8 U T05
2018-12-02 11:14:39 S 04 05 45.905 -07 53 35.56 V C57
2018-12-02 11:14:39 s 1 +70687.373 0 +322753.62 9740.0 C57
2018-12-02 11:25:59 C 04 05 58.34 -07 49 25.1 U T05
2018-12-02 11:39:08 C 04 05 57.25 -07 49 44.3 U T05
2018-12-02 11:44:39 S 04 05 43.202 -07 54 19.33 V C57
2018-12-02 11:44:39 s 1 +69752.902 0 +323828.54 3540.0 C57
2018-12-02 11:52:07 C 04 05 56.17 -07 50 03.2 U T05
2018-12-02 12:14:39 S 04 05 40.651 -07 55 01.85 V C57
2018-12-02 12:14:39 s 1 +68816.270 0 +324892.97 1470.0 C57
2018-12-02 12:44:39 S 04 05 38.112 -07 55 46.42 V C57
2018-12-02 12:44:39 s 1 +67877.520 0 +325946.95 3840.0 C57
2018-12-02 13:14:39 S 04 05 35.525 -07 56 29.87 V C57
2018-12-02 13:14:39 s 1 +66936.699 0 +326990.49 950.0 C57
2018-12-02 13:44:39 S 04 05 32.825 -07 57 12.49 V C57
2018-12-02 13:44:39 s 1 +65993.850 0 +328023.64 3090.0 C57
2018-12-02 14:14:39 S 04 05 30.228 -07 57 56.77 V C57
2018-12-02 14:14:39 s 1 +65049.015 0 +329046.43 550.0 C57
2018-12-02 14:44:39 S 04 05 27.612 -07 58 38.78 V C57
2018-12-02 14:44:39 s 1 +64102.239 0 +330058.89 3640.0 C57
2018-12-02 15:14:39 S 04 05 25.044 -07 59 22.88 V C57
2018-12-02 15:14:39 s 1 +63153.562 0 +331061.04 2620.0 C57
2018-12-02 15:44:39 S 04 05 22.541 -08 00 03.56 V C57
2018-12-02 15:44:39 s 1 +62203.028 0 +332052.93 7800.0 C57
2018-12-02 16:14:39 S 04 05 19.838 -08 00 48.82 V C57
2018-12-02 16:14:39 s 1 +61250.677 0 +333034.57 9450.0 C57
2018-12-02 16:44:39 S 04 05 17.225 -08 01 31.87 V C57
2018-12-02 16:44:39 s 1 +60296.550 0 +334006.01 7840.0 C57
2018-12-02 17:14:39 S 04 05 14.676 -08 02 16.55 V C57
2018-12-02 17:14:39 s 1 +59340.688 0 +334967.27 3250.0 C57
2018-12-02 17:44:39 S 04 05 12.084 -08 02 57.34 V C57
2018-12-02 17:44:39 s 1 +58383.131 0 +335918.38 5950.0 C57
2018-12-02 18:14:39 S 04 05 09.610 -08 03 41.11 V C57
2018-12-02 18:14:39 s 1 +57423.917 0 +336859.37 6200.0 C57
2018-12-02 18:44:39 S 04 05 06.924 -08 04 23.66 V C57
2018-12-02 18:44:39 s 1 +56463.087 0 +337790.26 4280.0 C57
2018-12-02 19:14:39 S 04 05 04.243 -08 05 08.63 V C57
2018-12-02 19:14:39 s 1 +55500.678 0 +338711.10 450.0 C57
2018-12-02 19:44:39 S 04 05 01.783 -08 05 49.92 V C57
2018-12-02 19:44:39 s 1 +54536.728 0 +339621.90 4950.0 C57
2018-12-02 20:14:39 S 04 04 59.198 -08 06 32.80 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)