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
2018-11-25 00:44:39 S 04 19 06.984 -03 16 17.08 V C57
2018-11-25 00:44:39 s 1 -180806.23 1 +243760.07 6080.0 C57
2018-11-25 01:14:39 S 04 19 04.788 -03 17 02.65 V C57
2018-11-25 01:14:39 s 1 -181184.62 6 +242165.45 2990.0 C57
2018-11-25 01:44:39 S 04 19 02.748 -03 17 44.99 V C57
2018-11-25 01:44:39 s 1 -181555.13 9 +240560.43 7010.0 C57
2018-11-25 02:14:39 S 04 19 00.326 -03 18 33.16 V C57
2018-11-25 02:14:39 s 1 -181917.68 3 +238945.00 7640.0 C57
2018-11-25 02:44:39 S 04 18 58.358 -03 19 16.93 V C57
2018-11-25 02:44:39 s 1 -182272.17 4 +237319.11 4430.0 C57
2018-11-25 03:14:39 S 04 18 56.182 -03 20 04.60 V C57
2018-11-25 03:14:39 s 1 -182618.52 2 +235682.76 6880.0 C57
2018-11-25 03:44:39 S 04 18 53.990 -03 20 48.80 V C57
2018-11-25 03:44:39 s 1 -182956.63 9 +234035.92 4510.0 C57
2018-11-25 04:14:39 S 04 18 51.919 -03 21 34.02 V C57
2018-11-25 04:14:39 s 1 -183286.43 5 +232378.56 6810.0 C57
2018-11-25 04:44:39 S 04 18 49.766 -03 22 18.95 V C57
2018-11-25 04:44:39 s 1 -183607.81 6 +230710.67 3280.0 C57
2018-11-25 05:14:39 S 04 18 47.554 -03 23 03.91 V C57
2018-11-25 05:14:39 s 1 -183920.69 1 +229032.21 3390.0 C57
2018-11-25 05:44:39 S 04 18 45.430 -03 23 51.14 V C57
2018-11-25 05:44:39 s 1 -184224.96 4 +227343.16 6630.0 C57
2018-11-25 06:14:39 S 04 18 43.241 -03 24 35.89 V C57
2018-11-25 06:14:39 s 1 -184520.53 8 +225643.51 2460.0 C57
2018-11-25 06:44:39 S 04 18 41.117 -03 25 19.56 V C57
2018-11-25 06:44:39 s 1 -184807.31 6 +223933.22 340.0 C57
2018-11-25 07:14:39 S 04 18 38.866 -03 26 06.58 V C57
2018-11-25 07:14:39 s 1 -185085.19 9 +222212.27 9720.0 C57
2018-11-25 07:44:39 S 04 18 36.792 -03 26 49.99 V C57
2018-11-25 07:44:39 s 1 -185354.08 4 +220480.63 40.0 C57
2018-11-25 08:14:39 S 04 18 34.678 -03 27 35.78 V C57
2018-11-25 08:14:39 s 1 -185613.86 9 +218738.29 720.0 C57
2018-11-25 08:44:39 S 04 18 32.508 -03 28 21.47 V C57
2018-11-25 08:44:39 s 1 -185864.44 9 +216985.22 1190.0 C57
2018-11-25 09:14:39 S 04 18 30.367 -03 29 07.40 V C57
2018-11-25 09:14:39 s 1 -186105.71 9 +215221.40 850.0 C57
2018-11-25 09:44:39 S 04 18 27.941 -03 29 57.70 V C57
2018-11-25 09:44:39 s 1 -186337.57 0 +213446.79 9110.0 C57
2018-11-25 10:14:39 S 04 18 26.062 -03 30 33.34 V C57
2018-11-25 10:14:39 s 1 -186559.89 2 +211661.38 5350.0 C57
2018-11-25 10:44:39 S 04 18 24.029 -03 31 19.09 V C57
2018-11-25 10:44:39 s 1 -186772.57 4 +209865.14 8960.0 C57
2018-11-25 11:14:39 S 04 18 21.689 -03 32 09.82 V C57
2018-11-25 11:14:39 s 1 -186975.50 1 +208058.05 9290.0 C57
2018-11-25 11:44:39 S 04 18 19.699 -03 32 53.66 V C57
2018-11-25 11:44:39 s 1 -187168.55 8 +206240.08 5710.0 C57
2018-11-25 12:14:39 S 04 18 17.484 -03 33 38.84 V C57
2018-11-25 12:14:39 s 1 -187351.62 7 +204411.21 7560.0 C57
2018-11-25 12:44:39 S 04 18 15.401 -03 34 19.67 V C57
2018-11-25 12:44:39 s 1 -187524.58 9 +202571.41 4170.0 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)