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
2021-06-26 16:34:00 s 1 +176303.66 1 +151176.16 3360.0 C57
2021-06-26 16:54:00 S 19 31 20.268 +37 34 28.16 V C57
2021-06-26 16:54:00 s 1 +176278.99 1 +152763.11 4520.0 C57
2021-06-26 17:04:00 S 19 31 19.279 +37 34 32.02 V C57
2021-06-26 17:04:00 s 1 +176263.82 3 +153554.15 7430.0 C57
2021-06-26 17:14:00 S 19 31 18.650 +37 34 27.37 V C57
2021-06-26 17:14:00 s 1 +176246.78 2 +154343.57 5260.0 C57
2021-06-26 17:24:00 S 19 31 17.496 +37 34 29.68 V C57
2021-06-26 17:24:00 s 1 +176227.88 1 +155131.37 8050.0 C57
2021-06-26 17:34:00 S 19 31 16.738 +37 34 31.94 V C57
2021-06-26 17:34:00 s 1 +176207.13 0 +155917.55 5840.0 C57
2021-06-26 17:44:00 S 19 31 15.934 +37 34 32.16 V C57
2021-06-26 17:44:00 s 1 +176184.54 0 +156702.12 8650.0 C57
2021-06-26 18:04:00 S 19 31 14.146 +37 34 31.44 V C57
2021-06-26 18:04:00 s 1 +176133.89 3 +158266.41 9470.0 C57
2021-06-26 18:54:00 S 19 31 09.662 +37 34 32.66 V C57
2021-06-26 18:54:00 s 1 +175975.89 4 +162149.01 1670.0 C57
2021-06-26 20:54:01 S 19 30 59.342 +37 34 37.78 V C57
2021-06-26 20:54:01 s 1 +175420.69 3 +171304.46 7760.0 C57
2021-06-26 21:04:00 S 19 30 58.733 +37 34 32.66 V C57
2021-06-26 21:04:00 s 1 +175363.61 1 +172057.11 7440.0 C57
2021-06-26 22:04:00 S 19 30 53.218 +37 34 35.22 V C57
2021-06-26 22:04:00 s 1 +174987.47 1 +176540.06 4960.0 C57
2021-06-26 22:14:00 S 19 30 52.673 +37 34 35.98 V C57
2021-06-26 22:14:00 s 1 +174919.26 1 +177281.73 4690.0 C57
2021-06-26 22:24:01 S 19 30 51.888 +37 34 36.19 V C57
2021-06-26 22:24:01 s 1 +174849.49 9 +178021.85 260.0 C57
2021-06-26 22:44:00 S 19 30 49.781 +37 34 38.64 V C57
2021-06-26 22:44:00 s 1 +174705.35 3 +179497.41 8970.0 C57
2021-06-26 22:54:00 S 19 30 49.008 +37 34 39.36 V C57
2021-06-26 22:54:00 s 1 +174630.98 7 +180232.85 2160.0 C57
2021-06-26 23:04:00 S 19 30 48.170 +37 34 36.41 V C57
2021-06-26 23:04:00 s 1 +174555.10 5 +180966.75 1280.0 C57
2021-06-26 23:44:00 S 19 30 44.760 +37 34 36.77 V C57
2021-06-26 23:44:00 s 1 +174236.58 2 +183886.85 7510.0 C57
2021-06-26 23:54:00 S 19 30 44.261 +37 34 35.87 V C57
2021-06-26 23:54:00 s 1 +174153.24 6 +184613.02 6630.0 C57
2021-06-27 00:54:00 S 19 30 38.825 +37 34 37.78 V C57
2021-06-27 00:54:00 s 1 +173622.75 3 +188937.77 9630.0 C57
2021-06-27 01:04:00 S 19 30 37.908 +37 34 40.30 V C57
2021-06-27 01:04:00 s 1 +173529.33 5 +189653.20 1730.0 C57
2021-06-27 01:14:00 S 19 30 37.082 +37 34 40.01 V C57
2021-06-27 01:14:00 s 1 +173434.50 9 +190367.11 60.0 C57
2021-06-27 01:24:00 S 19 30 36.322 +37 34 38.75 V C57
2021-06-27 01:24:00 s 1 +173338.28 3 +191079.50 4640.0 C57
2021-06-27 01:34:00 S 19 30 35.333 +37 34 37.31 V C57
2021-06-27 01:34:00 s 1 +173240.66 5 +191790.37 5500.0 C57
2021-06-27 01:44:00 S 19 30 34.519 +37 34 38.32 V C57
2021-06-27 01:44:00 s 1 +173141.66 3 +192499.73 2650.0 C57
2021-06-27 01:54:00 S 19 30 33.732 +37 34 39.76 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)