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
2021-01-24 12:54:07 S 05 58 32.386 -71 10 53.18 V C57
2021-01-24 12:54:07 s 1 -197943.39 1 +203712.05 1580.0 C57
2021-01-24 13:04:07 S 05 58 30.600 -71 11 08.16 V C57
2021-01-24 13:04:07 s 1 -197999.33 4 +203081.41 630.0 C57
2021-01-24 13:14:07 S 05 58 29.114 -71 11 22.67 V C57
2021-01-24 13:14:07 s 1 -198054.05 6 +202449.52 7550.0 C57
2021-01-24 13:24:07 S 05 58 27.658 -71 11 38.00 V C57
2021-01-24 13:24:07 s 1 -198107.55 0 +201816.38 2310.0 C57
2021-01-24 13:34:07 S 05 58 25.982 -71 11 51.94 V C57
2021-01-24 13:34:07 s 1 -198159.81 3 +201182.00 4910.0 C57
2021-01-24 13:44:07 S 05 58 24.235 -71 12 08.46 V C57
2021-01-24 13:44:07 s 1 -198210.83 7 +200546.36 5340.0 C57
2021-01-24 13:54:07 S 05 58 22.898 -71 12 23.08 V C57
2021-01-24 13:54:07 s 1 -198260.61 7 +199909.48 3590.0 C57
2021-01-24 14:04:07 S 05 58 21.182 -71 12 37.15 V C57
2021-01-24 14:04:07 s 1 -198309.14 8 +199271.34 9650.0 C57
2021-01-24 14:14:07 S 05 58 19.716 -71 12 52.34 V C57
2021-01-24 14:14:07 s 1 -198356.42 4 +198631.95 3500.0 C57
2021-01-24 14:24:07 S 05 58 17.818 -71 13 06.02 V C57
2021-01-24 14:24:07 s 1 -198402.43 9 +197991.30 5140.0 C57
2021-01-24 14:34:07 S 05 58 16.382 -71 13 22.08 V C57
2021-01-24 14:34:07 s 1 -198447.18 6 +197349.40 4560.0 C57
2021-01-24 14:44:07 S 05 58 14.765 -71 13 36.44 V C57
2021-01-24 14:44:07 s 1 -198490.66 1 +196706.23 1740.0 C57
2021-01-24 14:54:07 S 05 58 13.150 -71 13 50.99 V C57
2021-01-24 14:54:07 s 1 -198532.85 7 +196061.81 6680.0 C57
2021-01-24 15:04:07 S 05 58 11.868 -71 14 06.79 V C57
2021-01-24 15:04:07 s 1 -198573.76 8 +195416.12 9360.0 C57
2021-01-24 15:14:07 S 05 58 10.171 -71 14 20.72 V C57
2021-01-24 15:14:07 s 1 -198613.38 8 +194769.17 9770.0 C57
2021-01-24 15:24:07 S 05 58 08.522 -71 14 36.92 V C57
2021-01-24 15:24:07 s 1 -198651.71 1 +194120.96 7910.0 C57
2021-01-24 15:34:07 S 05 58 06.876 -71 14 51.86 V C57
2021-01-24 15:34:07 s 1 -198688.73 1 +193471.48 3760.0 C57
2021-01-24 15:44:07 S 05 58 05.350 -71 15 05.69 V C57
2021-01-24 15:44:07 s 1 -198724.44 2 +192820.73 7300.0 C57
2021-01-24 15:54:07 S 05 58 03.636 -71 15 20.05 V C57
2021-01-24 15:54:07 s 1 -198758.83 8 +192168.72 8540.0 C57
2021-01-24 16:04:07 S 05 58 02.026 -71 15 35.82 V C57
2021-01-24 16:04:07 s 1 -198791.91 2 +191515.43 7460.0 C57
2021-01-24 16:14:07 S 05 58 00.492 -71 15 52.16 V C57
2021-01-24 16:14:07 s 1 -198823.65 8 +190860.87 4040.0 C57
2021-01-24 16:24:07 S 05 57 59.076 -71 16 06.28 V C57
2021-01-24 16:24:07 s 1 -198854.07 0 +190205.04 8280.0 C57
2021-01-24 16:34:07 S 05 57 57.475 -71 16 20.10 V C57
2021-01-24 16:34:07 s 1 -198883.14 1 +189547.93 160.0 C57
2021-01-24 16:44:07 S 05 57 55.750 -71 16 34.50 V C57
2021-01-24 16:44:07 s 1 -198910.86 5 +188889.55 9670.0 C57
2021-01-24 16:54:07 S 05 57 54.151 -71 16 49.98 V C57
2021-01-24 16:54:07 s 1 -198937.23 6 +188229.89 6800.0 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)