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
2018-11-20 10:58:04 C 04 27 28.72 -00 29 16.7 U T05
2018-11-20 11:11:03 C 04 27 27.81 -00 29 36.6 U T05
2018-11-20 11:14:39 S 04 27 08.052 -00 31 25.82 V C57
2018-11-20 11:24:00 C 04 27 26.90 -00 29 56.5 U T05
2018-11-20 11:37:04 C 04 27 25.98 -00 30 16.6 U T05
2018-11-20 11:44:39 S 04 27 05.938 -00 32 09.85 V C57
2018-11-20 12:14:39 S 04 27 03.761 -00 32 54.35 V C57
2018-11-20 12:44:39 S 04 27 01.538 -00 33 40.86 V C57
2018-11-20 13:14:39 S 04 26 59.378 -00 34 25.93 V C57
2018-11-20 13:44:39 S 04 26 57.209 -00 35 10.82 V C57
2018-11-20 14:14:39 S 04 26 55.046 -00 35 56.04 V C57
2018-11-20 14:44:39 S 04 26 52.721 -00 36 42.19 V C57
2018-11-20 15:14:39 S 04 26 50.642 -00 37 26.15 V C57
2018-11-20 15:44:39 S 04 26 48.559 -00 38 10.10 V C57
2018-11-20 16:14:39 S 04 26 46.274 -00 38 55.72 V C57
2018-11-20 16:44:39 S 04 26 44.093 -00 39 41.15 V C57
2018-11-20 17:14:39 S 04 26 41.983 -00 40 26.47 V C57
2018-11-20 17:44:39 S 04 26 39.787 -00 41 10.57 V C57
2018-11-20 18:14:39 S 04 26 37.570 -00 41 56.22 V C57
2018-11-20 18:14:39 s 1 -10382.694 0 +372073.18 730.0 C57
2018-11-20 18:44:39 S 04 26 35.318 -00 42 42.34 V C57
2018-11-20 18:44:39 s 1 -11429.451 0 +372366.80 1030.0 C57
2018-11-20 19:14:39 S 04 26 33.149 -00 43 26.83 V C57
2018-11-20 19:14:39 s 1 -12475.875 0 +372651.23 1700.0 C57
2018-11-20 19:44:39 S 04 26 31.070 -00 44 11.87 V C57
2018-11-20 19:44:39 s 1 -13521.939 0 +372926.48 2880.0 C57
2018-11-20 20:14:39 S 04 26 28.889 -00 44 57.34 V C57
2018-11-20 20:14:39 s 1 -14567.619 0 +373192.56 4760.0 C57
2018-11-20 20:44:39 S 04 26 26.633 -00 45 43.06 V C57
2018-11-20 20:44:39 s 1 -15612.889 0 +373449.47 7480.0 C57
2018-11-20 21:14:39 S 04 26 24.478 -00 46 27.98 V C57
2018-11-20 21:14:39 s 1 -16657.724 0 +373697.24 1210.0 C57
2018-11-20 21:44:39 S 04 26 22.303 -00 47 12.77 V C57
2018-11-20 21:44:39 s 1 -17702.099 0 +373935.86 6100.0 C57
2018-11-20 22:14:39 S 04 26 20.098 -00 47 57.48 V C57
2018-11-20 22:14:39 s 1 -18745.987 0 +374165.36 2310.0 C57
2018-11-20 22:44:39 S 04 26 17.899 -00 48 42.37 V C57
2018-11-20 22:44:39 s 1 -19789.366 0 +374385.73 0.0 C57
2018-11-20 23:14:39 S 04 26 15.636 -00 49 27.41 V C57
2018-11-20 23:14:39 s 1 -20832.208 0 +374597.00 9330.0 C57
2018-11-20 23:44:39 S 04 26 13.598 -00 50 12.26 V C57
2018-11-20 23:44:39 s 1 -21874.490 0 +374799.17 440.0 C57
2018-11-21 00:14:39 S 04 26 11.350 -00 50 57.48 V C57
2018-11-21 00:14:39 s 1 -22916.187 0 +374992.24 3510.0 C57
2018-11-21 00:44:39 S 04 26 09.221 -00 51 43.42 V C57
2018-11-21 00:44:39 s 1 -23957.273 0 +375176.24 8670.0 C57
2018-11-21 01:14:39 S 04 26 06.998 -00 52 28.60 V C57
2018-11-21 01:14:39 s 1 -24997.724 0 +375351.16 6090.0 C57
2018-11-21 01:44:39 S 04 26 04.786 -00 53 13.52 V C57
2018-11-21 01:44:39 s 1 -26037.516 0 +375517.02 5910.0 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)