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
2021-06-27 09:20:03 C 19 30 41.78 +37 36 39.6 V T05
2021-06-27 09:24:00 S 19 29 55.901 +37 34 41.88 V C57
2021-06-27 09:24:00 s 1 +167215.08 6 +223526.23 4010.0 C57
2021-06-27 09:31:13 C 19 30 40.79 +37 36 40.7 V T05
2021-06-27 09:34:00 S 19 29 55.114 +37 34 40.30 V C57
2021-06-27 09:34:00 s 1 +167058.87 7 +224166.66 9000.0 C57
2021-06-27 09:37:07 C 19 30 39.68 +37 36 38.7 q U69
2021-06-27 10:04:00 S 19 29 52.685 +37 34 41.41 V C57
2021-06-27 10:04:00 s 1 +166583.86 1 +226079.46 7090.0 C57
2021-06-27 10:14:00 S 19 29 51.646 +37 34 39.72 V C57
2021-06-27 10:14:00 s 1 +166423.41 2 +226714.23 870.0 C57
2021-06-27 12:04:00 S 19 29 42.223 +37 34 42.67 V C57
2021-06-27 12:04:00 s 1 +164590.55 1 +233604.33 3370.0 C57
2021-06-27 12:14:00 S 19 29 41.690 +37 34 43.97 V C57
2021-06-27 12:14:00 s 1 +164417.88 9 +234222.35 4960.0 C57
2021-06-27 12:24:00 S 19 29 40.682 +37 34 40.30 V C57
2021-06-27 12:24:00 s 1 +164244.24 2 +234838.99 3960.0 C57
2021-06-27 12:34:00 S 19 29 40.042 +37 34 41.05 V C57
2021-06-27 12:34:00 s 1 +164069.61 6 +235454.25 380.0 C57
2021-06-27 12:44:00 S 19 29 39.346 +37 34 41.20 V C57
2021-06-27 12:44:00 s 1 +163894.01 5 +236068.12 4240.0 C57
2021-06-27 12:54:00 S 19 29 38.628 +37 34 38.10 V C57
2021-06-27 12:54:00 s 1 +163717.44 5 +236680.62 5550.0 C57
2021-06-27 13:04:00 S 19 29 37.706 +37 34 40.48 V C57
2021-06-27 13:04:00 s 1 +163539.91 0 +237291.75 4330.0 C57
2021-06-27 13:24:00 S 19 29 35.815 +37 34 40.69 V C57
2021-06-27 13:24:00 s 1 +163181.96 4 +238509.88 4320.0 C57
2021-06-27 13:44:00 S 19 29 34.272 +37 34 38.53 V C57
2021-06-27 13:44:00 s 1 +162820.21 8 +239722.53 4320.0 C57
2021-06-27 14:34:00 S 19 29 30.281 +37 34 39.72 V C57
2021-06-27 14:34:00 s 1 +161899.46 8 +242730.30 1340.0 C57
2021-06-27 14:54:00 S 19 29 28.615 +37 34 37.20 V C57
2021-06-27 14:54:00 s 1 +161524.71 2 +243923.90 7220.0 C57
2021-06-27 15:04:00 S 19 29 27.682 +37 34 40.37 V C57
2021-06-27 15:04:00 s 1 +161335.96 8 +244518.68 6580.0 C57
2021-06-27 15:14:00 S 19 29 26.974 +37 34 37.56 V C57
2021-06-27 15:14:00 s 1 +161146.32 1 +245112.10 3570.0 C57
2021-06-27 15:34:00 S 19 29 25.226 +37 34 38.86 V C57
2021-06-27 15:34:00 s 1 +160764.33 1 +246294.90 510.0 C57
2021-06-27 16:04:00 S 19 29 22.910 +37 34 39.18 V C57
2021-06-27 16:04:00 s 1 +160184.67 6 +248059.03 3450.0 C57
2021-06-27 18:44:00 S 19 29 09.958 +37 34 37.92 V C57
2021-06-27 18:44:00 s 1 +156962.52 0 +257265.49 4560.0 C57
2021-06-27 20:14:00 S 19 29 02.359 +37 34 35.94 V C57
2021-06-27 20:14:00 s 1 +155057.62 7 +262296.37 700.0 C57
2021-06-27 23:14:28 C 19 29 33.10 +37 37 47.8 V 130
2021-06-27 23:16:41 C 19 29 32.91 +37 37 48.0 V 130
2021-06-27 23:18:55 C 19 29 32.71 +37 37 48.3 V 130
2021-06-27 23:21:08 C 19 29 32.54 +37 37 48.6 V 130
2021-06-28 00:54:00 S 19 28 39.482 +37 34 27.30 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)