IAA RAS IAA Minor Planet Database

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
2018-11-17 21:44:39 S 04 31 29.506 +01 00 59.83 – V C57
2018-11-17 21:44:39 s 1 +121558.41 7 +236478.89 0.672 – C57
2018-11-17 22:14:39 S 04 31 27.317 +01 00 13.14 – V C57
2018-11-17 22:14:39 s 1 +120826.86 6 +238245.07 0.657 – C57
2018-11-17 22:44:39 S 04 31 25.342 +00 59 30.98 – V C57
2018-11-17 22:44:39 s 1 +120088.60 1 +239998.00 750.0 – C57
2018-11-17 23:14:39 S 04 31 23.345 +00 58 45.30 – V C57
2018-11-17 23:14:39 s 1 +119343.73 8 +241737.75 10.0 – C57
2018-11-17 23:44:39 S 04 31 21.312 +00 57 59.08 – V C57
2018-11-17 23:44:39 s 1 +118592.39 4 +243464.35 5070.0 – C57
2018-11-18 00:14:39 S 04 31 19.010 +00 57 15.88 – V C57
2018-11-18 00:14:39 s 1 +117834.67 8 +245177.87 6670.0 – C57
2018-11-19 00:37:03 C 04 29 43.90 +00 23 14.4 – q 160
2018-11-19 00:41:06 C 04 29 43.62 +00 23 08.4 – q 160
2018-11-19 00:45:11 C 04 29 43.35 +00 23 02.1 – q 160
2018-11-19 04:13:46 C 04 29 30.65 +00 17 45.4 – V 703
2018-11-19 04:21:40 C 04 29 30.11 +00 17 33.6 – V 703
2018-11-19 04:29:34 C 04 29 29.59 +00 17 21.6 – V 703
2018-11-19 04:37:28 C 04 29 29.05 +00 17 08.9 – V 703
2018-11-19 12:44:39 S 04 28 45.199 +00 02 24.40 – V C57
2018-11-19 12:44:39 s 1 +50968.121 0 +337959.02 6820.0 – C57
2018-11-19 13:14:39 S 04 28 43.025 +00 01 37.60 – V C57
2018-11-19 13:14:39 s 1 +49952.382 0 +338822.44 2770.0 – C57
2018-11-19 13:44:39 S 04 28 41.023 +00 00 53.53 – V C57
2018-11-19 13:44:39 s 1 +48935.164 0 +339675.62 7290.0 – C57
2018-11-19 14:14:39 S 04 28 38.777 +00 00 09.40 – V C57
2018-11-19 14:14:39 s 1 +47916.506 0 +340518.58 640.0 – C57
2018-11-19 14:44:39 S 04 28 36.672 -00 00 35.89 – V C57
2018-11-19 14:44:39 s 1 +46896.445 0 +341351.36 3060.0 – C57
2018-11-19 15:14:39 S 04 28 34.476 -00 01 20.50 – V C57
2018-11-19 15:14:39 s 1 +45875.019 0 +342173.97 4820.0 – C57
2018-11-19 15:44:39 S 04 28 32.350 -00 02 05.64 – V C57
2018-11-19 15:44:39 s 1 +44852.266 0 +342986.44 6140.0 – C57
2018-11-19 16:14:39 S 04 28 30.187 -00 02 52.37 – V C57
2018-11-19 16:14:39 s 1 +43828.223 0 +343788.79 7290.0 – C57
2018-11-19 16:44:39 S 04 28 28.099 -00 03 38.05 – V C57
2018-11-19 16:44:39 s 1 +42802.925 0 +344581.05 8490.0 – C57
2018-11-19 17:14:39 S 04 28 25.882 -00 04 23.52 – V C57
2018-11-19 17:14:39 s 1 +41776.410 0 +345363.24 9990.0 – C57
2018-11-19 17:44:39 S 04 28 23.846 -00 05 05.32 – V C57
2018-11-19 17:44:39 s 1 +40748.712 0 +346135.38 2030.0 – C57
2018-11-19 18:14:39 S 04 28 21.598 -00 05 51.94 – V C57
2018-11-19 18:14:39 s 1 +39719.868 0 +346897.50 4830.0 – C57
2018-11-19 18:44:39 S 04 28 19.385 -00 06 37.44 – V C57
2018-11-19 18:44:39 s 1 +38689.914 0 +347649.62 8640.0 – C57
2018-11-19 19:14:39 S 04 28 17.335 -00 07 21.50 – V C57
2018-11-19 19:14:39 s 1 +37658.882 0 +348391.76 3680.0 – C57
2018-11-19 19:44:39 S 04 28 15.127 -00 08 07.30 – V C57
2018-11-19 19:44:39 s 1 +36626.810 0 +349123.94 180.0 – C57
2018-11-19 20:14:39 S 04 28 13.003 -00 08 51.58 – 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)