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
2018-11-29 04:14:39 s 1 +117953.73 5 - 8348.187 2300.0 C57
2018-11-29 04:44:39 S 04 12 26.736 -05 54 35.32 V C57
2018-11-29 04:44:39 s 1 +119441.22 9 - 5234.957 520.0 C57
2018-11-29 05:14:39 S 04 12 24.398 -05 55 24.92 V C57
2018-11-29 05:14:39 s 1 +120869.86 8 - 2119.141 150.0 C57
2018-11-29 05:44:39 S 04 12 22.056 -05 56 13.60 V C57
2018-11-29 05:44:39 s 1 +122241.17 4 + 997.687 8070.0 C57
2018-11-29 06:14:39 S 04 12 19.776 -05 57 00.86 V C57
2018-11-29 06:14:39 s 1 +123556.64 6 + 4114.065 1150.0 C57
2018-11-29 06:44:39 S 04 12 17.282 -05 57 50.98 V C57
2018-11-29 06:44:39 s 1 +124817.75 3 + 7228.637 6220.0 C57
2018-11-29 07:14:39 S 04 12 15.043 -05 58 35.76 V C57
2018-11-29 07:14:39 s 1 +126025.93 5 +10340.148 60.0 C57
2018-11-29 09:11:15 C 04 11 49.51 -05 58 47.5 V 703
2018-11-29 09:19:00 C 04 11 48.87 -05 58 59.1 V 703
2018-11-29 09:26:46 C 04 11 48.25 -05 59 10.7 V 703
2018-11-29 09:34:31 C 04 11 47.62 -05 59 22.7 V 703
2018-11-29 10:14:39 S 04 12 00.516 -06 03 28.62 V C57
2018-11-29 10:14:39 s 1 +132240.10 9 +28885.613 7410.0 C57
2018-11-29 10:44:39 S 04 11 58.058 -06 04 17.40 V C57
2018-11-29 10:44:39 s 1 +133115.35 8 +31947.633 5530.0 C57
2018-11-29 11:14:39 S 04 11 55.680 -06 05 03.95 V C57
2018-11-29 11:14:39 s 1 +133948.00 0 +34999.427 3360.0 C57
2018-11-29 11:44:39 S 04 11 53.203 -06 05 52.01 V C57
2018-11-29 11:44:39 s 1 +134739.17 0 +38040.382 6710.0 C57
2018-11-29 12:14:39 S 04 11 50.760 -06 06 41.40 V C57
2018-11-29 12:14:39 s 1 +135489.97 2 +41069.939 1310.0 C57
2018-11-29 12:44:39 S 04 11 48.329 -06 07 27.66 V C57
2018-11-29 12:44:39 s 1 +136201.47 6 +44087.581 2700.0 C57
2018-11-29 13:14:39 S 04 11 45.883 -06 08 17.88 V C57
2018-11-29 13:14:39 s 1 +136874.72 0 +47092.834 6330.0 C57
2018-11-29 13:44:39 S 04 11 43.454 -06 09 04.10 V C57
2018-11-29 13:44:39 s 1 +137510.71 1 +50085.267 7490.0 C57
2018-11-29 14:14:39 S 04 11 40.925 -06 09 51.91 V C57
2018-11-29 14:14:39 s 1 +138110.42 5 +53064.481 1360.0 C57
2018-11-29 14:44:39 S 04 11 38.443 -06 10 39.68 V C57
2018-11-29 14:44:39 s 1 +138674.81 0 +56030.116 2980.0 C57
2018-11-29 15:14:39 S 04 11 36.034 -06 11 26.81 V C57
2018-11-29 15:14:39 s 1 +139204.78 1 +58981.840 7250.0 C57
2018-11-29 15:44:39 S 04 11 33.566 -06 12 14.29 V C57
2018-11-29 15:44:39 s 1 +139701.22 8 +61919.353 8970.0 C57
2018-11-29 16:14:39 S 04 11 30.989 -06 13 02.42 V C57
2018-11-29 16:14:39 s 1 +140165.01 4 +64842.381 2780.0 C57
2018-11-29 16:44:39 S 04 11 28.577 -06 13 49.12 V C57
2018-11-29 16:44:39 s 1 +140596.97 2 +67750.677 3220.0 C57
2018-11-29 17:14:39 S 04 11 26.078 -06 14 36.24 V C57
2018-11-29 17:14:39 s 1 +140997.91 2 +70644.017 4720.0 C57
2018-11-29 17:44:39 S 04 11 23.513 -06 15 25.27 V C57
2018-11-29 17:44:39 s 1 +141368.61 7 +73522.199 1560.0 C57
2018-11-29 18:14:39 S 04 11 21.086 -06 16 11.14 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)