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 20:14:39 s 1 +53571.276 0 +340522.69 8060.0 C57
2018-12-02 20:44:39 S 04 04 56.657 -08 07 15.82 V C57
2018-12-02 20:44:39 s 1 +52604.359 0 +341413.51 20.0 C57
2018-12-02 21:14:39 S 04 04 54.005 -08 07 58.44 V C57
2018-12-02 21:14:39 s 1 +51636.013 0 +342294.37 1080.0 C57
2018-12-02 21:44:39 S 04 04 51.348 -08 08 42.94 V C57
2018-12-02 21:44:39 s 1 +50666.275 0 +343165.31 1500.0 C57
2018-12-02 22:14:39 S 04 04 48.778 -08 09 24.59 V C57
2018-12-02 22:14:39 s 1 +49695.181 0 +344026.35 1510.0 C57
2018-12-02 22:44:39 S 04 04 46.181 -08 10 09.01 V C57
2018-12-02 22:44:39 s 1 +48722.767 0 +344877.52 1360.0 C57
2018-12-02 23:14:39 S 04 04 43.666 -08 10 51.49 V C57
2018-12-02 23:14:39 s 1 +47749.069 0 +345718.84 1290.0 C57
2018-12-02 23:44:39 S 04 04 40.949 -08 11 33.97 V C57
2018-12-02 23:44:39 s 1 +46774.120 0 +346550.35 1540.0 C57
2018-12-03 00:14:39 S 04 04 38.374 -08 12 16.88 V C57
2018-12-03 00:14:39 s 1 +45797.956 0 +347372.06 2350.0 C57
2018-12-03 00:44:39 S 04 04 35.861 -08 12 59.18 V C57
2018-12-03 00:44:39 s 1 +44820.612 0 +348184.00 3930.0 C57
2018-12-03 01:14:39 S 04 04 33.158 -08 13 42.28 V C57
2018-12-03 01:14:39 s 1 +43842.121 0 +348986.20 6540.0 C57
2018-12-03 01:44:39 S 04 04 30.617 -08 14 24.18 V C57
2018-12-03 01:44:39 s 1 +42862.516 0 +349778.67 390.0 C57
2018-12-03 03:44:39 S 04 04 20.270 -08 17 17.27 V C57
2018-12-03 03:44:39 s 1 +38933.624 0 +352851.87 2740.0 C57
2018-12-03 04:14:39 S 04 04 17.647 -08 17 59.39 V C57
2018-12-03 04:14:39 s 1 +37948.945 0 +353596.11 6170.0 C57
2018-12-03 04:44:39 S 04 04 15.158 -08 18 41.87 V C57
2018-12-03 04:44:39 s 1 +36963.348 0 +354330.77 2170.0 C57
2018-12-03 05:14:39 S 04 04 12.550 -08 19 24.46 V C57
2018-12-03 05:14:39 s 1 +35976.863 0 +355055.88 950.0 C57
2018-12-03 05:44:39 S 04 04 09.958 -08 20 07.19 V C57
2018-12-03 05:44:39 s 1 +34989.523 0 +355771.46 2730.0 C57
2018-12-03 06:14:39 S 04 04 07.373 -08 20 49.24 V C57
2018-12-03 06:14:39 s 1 +34001.357 0 +356477.52 7710.0 C57
2018-12-03 06:44:39 S 04 04 04.747 -08 21 32.62 V C57
2018-12-03 06:44:39 s 1 +33012.397 0 +357174.10 6100.0 C57
2018-12-03 07:14:39 S 04 04 02.201 -08 22 14.34 V C57
2018-12-03 07:14:39 s 1 +32022.673 0 +357861.21 8110.0 C57
2018-12-03 07:44:39 S 04 03 59.566 -08 22 58.08 V C57
2018-12-03 07:44:39 s 1 +31032.215 0 +358538.87 3940.0 C57
2018-12-03 08:14:39 S 04 03 57.002 -08 23 39.44 V C57
2018-12-03 08:14:39 s 1 +30041.052 0 +359207.11 3800.0 C57
2018-12-03 08:44:39 S 04 03 54.362 -08 24 22.54 V C57
2018-12-03 08:44:39 s 1 +29049.215 0 +359865.95 7880.0 C57
2018-12-03 09:14:39 S 04 03 51.809 -08 25 06.02 V C57
2018-12-03 09:14:39 s 1 +28056.731 0 +360515.40 6380.0 C57
2018-12-03 09:44:39 S 04 03 49.260 -08 25 47.60 V C57
2018-12-03 09:44:39 s 1 +27063.632 0 +361155.49 9500.0 C57
2018-12-03 10:14:39 S 04 03 46.644 -08 26 30.23 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)