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
2021-01-29 16:54:07 s 1 +136375.63 9 +239774.07 9020.0 C57
2021-01-29 17:04:07 S 05 39 55.625 -74 37 06.10 V C57
2021-01-29 17:04:07 s 1 +136161.02 0 +240391.50 8580.0 C57
2021-01-29 17:14:07 S 05 39 52.918 -74 37 25.07 V C57
2021-01-29 17:14:07 s 1 +135945.48 4 +241007.30 6430.0 C57
2021-01-29 17:24:07 S 05 39 50.642 -74 37 42.49 V C57
2021-01-29 17:24:07 s 1 +135729.03 5 +241621.49 2580.0 C57
2021-01-29 17:34:07 S 05 39 48.182 -74 37 59.88 V C57
2021-01-29 17:34:07 s 1 +135511.68 0 +242234.05 7050.0 C57
2021-01-29 17:44:07 S 05 39 45.866 -74 38 18.31 V C57
2021-01-29 17:44:07 s 1 +135293.42 5 +242845.00 9840.0 C57
2021-01-29 17:54:07 S 05 39 43.855 -74 38 35.70 V C57
2021-01-29 17:54:07 s 1 +135074.27 4 +243454.34 970.0 C57
2021-01-29 18:04:07 S 05 39 41.040 -74 38 54.06 V C57
2021-01-29 18:04:07 s 1 +134854.23 3 +244062.08 440.0 C57
2021-01-29 18:14:07 S 05 39 38.602 -74 39 11.95 V C57
2021-01-29 18:14:07 s 1 +134633.30 8 +244668.21 8260.0 C57
2021-01-29 18:24:07 S 05 39 36.550 -74 39 30.67 V C57
2021-01-29 18:24:07 s 1 +134411.50 4 +245272.73 4450.0 C57
2021-01-29 18:34:07 S 05 39 34.039 -74 39 47.99 V C57
2021-01-29 18:34:07 s 1 +134188.82 6 +245875.66 9010.0 C57
2021-01-29 18:44:07 S 05 39 31.608 -74 40 06.17 V C57
2021-01-29 18:44:07 s 1 +133965.28 0 +246477.00 1960.0 C57
2021-01-29 18:54:07 S 05 39 29.316 -74 40 23.92 V C57
2021-01-29 18:54:07 s 1 +133740.87 0 +247076.74 3290.0 C57
2021-01-29 19:04:07 S 05 39 26.940 -74 40 41.30 V C57
2021-01-29 19:04:07 s 1 +133515.60 3 +247674.90 3030.0 C57
2021-01-29 19:14:07 S 05 39 24.398 -74 41 00.82 V C57
2021-01-29 19:14:07 s 1 +133289.48 4 +248271.47 1180.0 C57
2021-01-29 19:24:07 S 05 39 21.931 -74 41 18.06 V C57
2021-01-29 19:24:07 s 1 +133062.51 6 +248866.45 7750.0 C57
2021-01-29 19:34:07 S 05 39 19.476 -74 41 36.35 V C57
2021-01-29 19:34:07 s 1 +132834.70 7 +249459.86 2760.0 C57
2021-01-29 19:44:07 S 05 39 16.937 -74 41 54.56 V C57
2021-01-29 19:44:07 s 1 +132606.06 0 +250051.69 6200.0 C57
2021-01-29 19:54:07 S 05 39 14.791 -74 42 12.35 V C57
2021-01-29 19:54:07 s 1 +132376.58 1 +250641.95 8090.0 C57
2021-01-29 20:04:07 S 05 39 12.478 -74 42 30.20 V C57
2021-01-29 20:04:07 s 1 +132146.27 5 +251230.64 8430.0 C57
2021-01-29 20:14:07 S 05 39 10.126 -74 42 47.09 V C57
2021-01-29 20:14:07 s 1 +131915.14 7 +251817.76 7250.0 C57
2021-01-29 20:24:07 S 05 39 07.774 -74 43 05.41 V C57
2021-01-29 20:24:07 s 1 +131683.20 1 +252403.32 4540.0 C57
2021-01-29 20:34:07 S 05 39 05.309 -74 43 23.27 V C57
2021-01-29 20:34:07 s 1 +131450.44 3 +252987.32 310.0 C57
2021-01-29 20:44:07 S 05 39 02.844 -74 43 41.59 V C57
2021-01-29 20:44:07 s 1 +131216.87 8 +253569.75 4580.0 C57
2021-01-29 20:54:07 S 05 39 00.382 -74 43 59.02 V C57
2021-01-29 20:54:07 s 1 +130982.50 9 +254150.64 7350.0 C57
2021-01-29 21:04:07 S 05 38 58.087 -74 44 16.26 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)