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
2018-12-04 14:44:39 s 1 -30697.411 0 +382837.11 920.0 – C57
2018-12-04 15:14:39 S 04 01 17.849 -09 06 59.80 – V C57
2018-12-04 15:14:39 s 1 -31681.974 0 +382952.66 7910.0 – C57
2018-12-04 15:44:39 S 04 01 15.264 -09 07 42.10 – V C57
2018-12-04 15:44:39 s 1 -32665.708 0 +383059.67 9140.0 – C57
2018-12-04 16:14:39 S 04 01 12.679 -09 08 23.21 – V C57
2018-12-04 16:14:39 s 1 -33648.592 0 +383158.15 4750.0 – C57
2018-12-04 16:44:39 S 04 01 10.114 -09 09 05.04 – V C57
2018-12-04 16:44:39 s 1 -34630.605 0 +383248.09 4870.0 – C57
2018-12-04 17:14:39 S 04 01 07.579 -09 09 47.56 – V C57
2018-12-04 17:14:39 s 1 -35611.725 0 +383329.52 9630.0 – C57
2018-12-04 17:44:39 S 04 01 05.042 -09 10 28.24 – V C57
2018-12-04 17:44:39 s 1 -36591.931 0 +383402.43 9180.0 – C57
2018-12-04 18:14:39 S 04 01 02.448 -09 11 08.48 – V C57
2018-12-04 18:14:39 s 1 -37571.204 0 +383466.83 3650.0 – C57
2018-12-04 18:44:39 S 04 01 00.024 -09 11 48.70 – V C57
2018-12-04 18:44:39 s 1 -38549.520 0 +383522.74 3160.0 – C57
2018-12-04 19:14:39 S 04 00 57.480 -09 12 29.38 – V C57
2018-12-04 19:14:39 s 1 -39526.860 0 +383570.15 7870.0 – C57
2018-12-04 19:44:39 S 04 00 54.794 -09 13 11.75 – V C57
2018-12-04 19:44:39 s 1 -40503.203 0 +383609.07 7890.0 – C57
2018-12-04 20:14:39 S 04 00 52.217 -09 13 53.90 – V C57
2018-12-04 20:14:39 s 1 -41478.527 0 +383639.52 3360.0 – C57
2018-12-04 20:44:39 S 04 00 49.793 -09 14 35.52 – V C57
2018-12-04 20:44:39 s 1 -42452.812 0 +383661.48 4420.0 – C57
2018-12-04 21:14:39 S 04 00 47.278 -09 15 15.98 – V C57
2018-12-04 21:14:39 s 1 -43426.037 0 +383674.98 1200.0 – C57
2018-12-04 21:44:39 S 04 00 44.702 -09 15 57.60 – V C57
2018-12-04 21:44:39 s 1 -44398.181 0 +383680.02 3830.0 – C57
2018-12-04 22:14:39 S 04 00 42.185 -09 16 38.39 – V C57
2018-12-04 22:14:39 s 1 -45369.223 0 +383676.60 2440.0 – C57
2018-12-04 22:44:39 S 04 00 39.629 -09 17 18.82 – V C57
2018-12-04 22:44:39 s 1 -46339.142 0 +383664.73 7160.0 – C57
2018-12-04 23:14:39 S 04 00 37.090 -09 17 58.96 – V C57
2018-12-04 23:14:39 s 1 -47307.918 0 +383644.41 8130.0 – C57
2018-12-04 23:44:39 S 04 00 34.469 -09 18 41.98 – V C57
2018-12-04 23:44:39 s 1 -48275.530 0 +383615.65 5480.0 – C57
2018-12-05 00:14:39 S 04 00 32.057 -09 19 22.22 – V C57
2018-12-05 00:14:39 s 1 -49241.956 0 +383578.45 9330.0 – C57
2018-12-05 01:14:39 S 04 00 26.945 -09 20 46.00 – V C57
2018-12-05 01:14:39 s 1 -51171.171 0 +383478.77 7080.0 – C57
2018-12-05 04:14:39 S 04 00 11.753 -09 24 49.82 – V C57
2018-12-05 04:14:39 s 1 -56928.211 0 +382977.72 70.0 – C57
2018-12-05 04:44:39 S 04 00 09.326 -09 25 31.15 – V C57
2018-12-05 04:44:39 s 1 -57883.036 0 +382864.80 8350.0 – C57
2018-12-05 05:14:39 S 04 00 06.802 -09 26 11.44 – V C57
2018-12-05 05:14:39 s 1 -58836.468 0 +382743.48 4430.0 – C57
2018-12-05 05:44:39 S 04 00 04.284 -09 26 52.91 – V C57
2018-12-05 05:44:39 s 1 -59788.486 0 +382613.76 8460.0 – C57
2018-12-05 06:14:39 S 04 00 01.738 -09 27 33.48 – 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)