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
2021-07-05 09:24:00 s 1 -184992.46 7 +273889.20 1340.0 C57
2021-07-05 09:34:00 S 19 15 34.174 +37 16 26.87 V C57
2021-07-05 09:34:00 s 1 -185188.60 0 +273394.38 6660.0 C57
2021-07-05 10:04:47 C 19 15 16.21 +37 24 38.8 Y U69
2021-07-05 10:48:00 C 19 15 13.07 +37 24 29.5 Y U69
2021-07-05 10:54:00 S 19 15 28.886 +37 16 08.54 V C57
2021-07-05 10:54:00 s 1 -186732.06 2 +269398.41 7720.0 C57
2021-07-05 11:34:04 C 19 15 09.29 +37 24 19.3 Y U69
2021-07-05 13:04:00 S 19 15 19.490 +37 15 47.41 V C57
2021-07-05 13:04:00 s 1 -189139.13 8 +262762.34 1390.0 C57
2021-07-05 14:04:00 S 19 15 15.211 +37 15 39.28 V C57
2021-07-05 14:04:00 s 1 -190207.71 5 +259639.46 8960.0 C57
2021-07-05 14:24:00 S 19 15 13.634 +37 15 33.62 V C57
2021-07-05 14:24:00 s 1 -190557.68 1 +258590.03 5230.0 C57
2021-07-05 14:34:00 S 19 15 13.375 +37 15 31.21 V C57
2021-07-05 14:34:00 s 1 -190731.48 8 +258063.72 9650.0 C57
2021-07-05 15:34:00 S 19 15 09.120 +37 15 20.81 V C57
2021-07-05 15:34:00 s 1 -191757.67 8 +254883.56 3410.0 C57
2021-07-05 16:04:00 S 19 15 06.953 +37 15 15.48 V C57
2021-07-05 16:04:00 s 1 -192259.93 4 +253279.08 6000.0 C57
2021-07-05 16:24:00 S 19 15 05.474 +37 15 12.56 V C57
2021-07-05 16:24:00 s 1 -192590.70 1 +252204.08 1530.0 C57
2021-07-05 16:34:00 S 19 15 04.754 +37 15 12.31 V C57
2021-07-05 16:34:00 s 1 -192754.85 5 +251664.98 5400.0 C57
2021-07-05 16:44:00 S 19 15 03.864 +37 15 07.78 V C57
2021-07-05 16:44:00 s 1 -192918.18 3 +251124.80 6670.0 C57
2021-07-05 16:54:00 S 19 15 03.173 +37 15 08.42 V C57
2021-07-05 16:54:00 s 1 -193080.68 5 +250583.55 5330.0 C57
2021-07-05 17:14:00 S 19 15 01.826 +37 15 02.81 V C57
2021-07-05 17:14:00 s 1 -193403.19 2 +249497.82 4760.0 C57
2021-07-05 17:34:00 S 19 15 00.569 +37 15 02.12 V C57
2021-07-05 17:34:00 s 1 -193722.35 2 +248407.80 3620.0 C57
2021-07-05 17:54:00 S 19 14 58.889 +37 14 58.81 V C57
2021-07-05 17:54:00 s 1 -194038.13 7 +247313.46 1830.0 C57
2021-07-05 18:14:00 S 19 14 57.655 +37 14 53.20 V C57
2021-07-05 18:14:00 s 1 -194350.52 3 +246214.82 9310.0 C57
2021-07-05 18:24:00 S 19 14 56.842 +37 14 52.80 V C57
2021-07-05 18:24:00 s 1 -194505.43 3 +245663.87 4010.0 C57
2021-07-05 18:34:00 S 19 14 56.201 +37 14 52.69 V C57
2021-07-05 18:34:00 s 1 -194659.48 3 +245111.84 5990.0 C57
2021-07-05 18:44:00 S 19 14 55.637 +37 14 47.80 V C57
2021-07-05 18:44:00 s 1 -194812.67 1 +244558.73 5260.0 C57
2021-07-05 18:54:00 S 19 14 54.934 +37 14 44.63 V C57
2021-07-05 18:54:00 s 1 -194964.99 1 +244004.54 1790.0 C57
2021-07-05 20:04:00 S 19 14 50.172 +37 14 33.58 V C57
2021-07-05 20:04:00 s 1 -196006.69 6 +240094.80 210.0 C57
2021-07-05 21:54:00 S 19 14 42.276 +37 14 15.22 V C57
2021-07-05 21:54:00 s 1 -197554.72 1 +233842.90 730.0 C57
2021-07-05 22:04:00 S 19 14 41.429 +37 14 14.17 V C57
2021-07-05 22:04:00 s 1 -197689.92 6 +233267.97 3410.0 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)