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
2021-01-16 18:34:08 s 1 +119685.46 1 +275681.24 2070.0 C57
2021-01-16 18:44:08 S 06 24 54.806 -65 44 19.72 V C57
2021-01-16 18:44:08 s 1 +119430.63 2 +276207.77 1420.0 C57
2021-01-16 18:54:08 S 06 24 53.770 -65 44 39.48 V C57
2021-01-16 18:54:08 s 1 +119175.16 8 +276732.85 9670.0 C57
2021-01-16 20:34:08 S 06 24 42.468 -65 47 59.86 V C57
2021-01-16 20:34:08 s 1 +116586.33 1 +281904.72 2650.0 C57
2021-01-16 20:44:08 S 06 24 41.191 -65 48 20.27 V C57
2021-01-16 20:44:08 s 1 +116324.10 6 +282414.06 9130.0 C57
2021-01-16 20:54:08 S 06 24 40.229 -65 48 40.68 V C57
2021-01-16 20:54:08 s 1 +116061.28 7 +282922.00 4570.0 C57
2021-01-16 21:04:08 S 06 24 39.218 -65 49 00.98 V C57
2021-01-16 21:04:08 s 1 +115797.87 8 +283428.51 8980.0 C57
2021-01-16 21:14:08 S 06 24 37.954 -65 49 21.07 V C57
2021-01-16 21:14:08 s 1 +115533.88 1 +283933.62 2370.0 C57
2021-01-16 21:24:08 S 06 24 36.701 -65 49 40.51 V C57
2021-01-16 21:24:08 s 1 +115269.30 2 +284437.32 4740.0 C57
2021-01-16 21:34:08 S 06 24 35.520 -65 50 00.24 V C57
2021-01-16 21:34:08 s 1 +115004.14 2 +284939.62 6100.0 C57
2021-01-16 21:44:08 S 06 24 34.754 -65 50 21.26 V C57
2021-01-16 21:44:08 s 1 +114738.40 5 +285440.51 6460.0 C57
2021-01-16 21:54:08 S 06 24 33.823 -65 50 41.42 V C57
2021-01-16 21:54:08 s 1 +114472.09 4 +285940.01 5810.0 C57
2021-01-16 22:04:08 S 06 24 32.431 -65 51 00.58 V C57
2021-01-16 22:04:08 s 1 +114205.21 3 +286438.10 4170.0 C57
2021-01-16 22:14:08 S 06 24 31.250 -65 51 20.34 V C57
2021-01-16 22:14:08 s 1 +113937.76 4 +286934.80 1540.0 C57
2021-01-16 22:24:08 S 06 24 30.144 -65 51 40.86 V C57
2021-01-16 22:24:08 s 1 +113669.75 2 +287430.11 7920.0 C57
2021-01-16 22:34:08 S 06 24 29.208 -65 52 00.80 V C57
2021-01-16 22:34:08 s 1 +113401.17 9 +287924.03 3330.0 C57
2021-01-16 22:44:08 S 06 24 27.835 -65 52 21.25 V C57
2021-01-16 22:44:08 s 1 +113132.04 8 +288416.56 7760.0 C57
2021-01-16 22:54:08 S 06 24 26.650 -65 52 40.84 V C57
2021-01-16 22:54:08 s 1 +112862.36 3 +288907.70 1230.0 C57
2021-01-16 23:04:08 S 06 24 25.536 -65 52 59.70 V C57
2021-01-16 23:04:08 s 1 +112592.12 6 +289397.46 3730.0 C57
2021-01-16 23:14:08 S 06 24 24.600 -65 53 20.90 V C57
2021-01-16 23:14:08 s 1 +112321.34 2 +289885.85 5270.0 C57
2021-01-16 23:24:08 S 06 24 23.510 -65 53 40.78 V C57
2021-01-16 23:24:08 s 1 +112050.01 2 +290372.85 5870.0 C57
2021-01-16 23:34:08 S 06 24 22.265 -65 54 00.11 V C57
2021-01-16 23:34:08 s 1 +111778.14 0 +290858.47 5510.0 C57
2021-01-16 23:44:08 S 06 24 21.050 -65 54 20.09 V C57
2021-01-16 23:44:08 s 1 +111505.73 0 +291342.73 4220.0 C57
2021-01-16 23:54:08 S 06 24 19.944 -65 54 39.24 V C57
2021-01-16 23:54:08 s 1 +111232.78 3 +291825.61 1980.0 C57
2021-01-17 00:04:08 S 06 24 18.895 -65 55 00.37 V C57
2021-01-17 00:04:08 s 1 +110959.30 3 +292307.12 8820.0 C57
2021-01-17 00:14:08 S 06 24 17.683 -65 55 21.72 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)