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
2018-12-08 03:14:39 s 1 -167389.42 4 +281649.18 2290.0 C57
2018-12-08 03:44:39 S 03 54 22.032 -10 59 13.85 V C57
2018-12-08 03:44:39 s 1 -167885.47 2 +280296.03 5810.0 C57
2018-12-08 04:14:39 S 03 54 19.783 -10 59 51.50 V C57
2018-12-08 04:14:39 s 1 -168375.59 1 +278933.16 6180.0 C57
2018-12-08 04:44:39 S 03 54 17.426 -11 00 29.56 V C57
2018-12-08 04:44:39 s 1 -168859.72 1 +277560.55 3080.0 C57
2018-12-08 05:14:39 S 03 54 15.036 -11 01 09.01 V C57
2018-12-08 05:14:39 s 1 -169337.80 2 +276178.17 6170.0 C57
2018-12-08 05:44:39 S 03 54 12.710 -11 01 48.00 V C57
2018-12-08 05:44:39 s 1 -169809.77 2 +274786.00 5130.0 C57
2018-12-08 06:14:39 S 03 54 10.385 -11 02 25.48 V C57
2018-12-08 06:14:39 s 1 -170275.56 8 +273384.02 9610.0 C57
2018-12-08 06:44:39 S 03 54 08.102 -11 03 03.02 V C57
2018-12-08 06:44:39 s 1 -170735.12 8 +271972.19 9280.0 C57
2018-12-08 07:14:39 S 03 54 05.722 -11 03 41.90 V C57
2018-12-08 07:14:39 s 1 -171188.38 6 +270550.50 3780.0 C57
2018-12-08 07:44:39 S 03 54 03.461 -11 04 20.10 V C57
2018-12-08 07:44:39 s 1 -171635.27 8 +269118.92 2780.0 C57
2018-12-08 08:14:39 S 03 54 01.075 -11 04 58.44 V C57
2018-12-08 08:14:39 s 1 -172075.73 8 +267677.41 5900.0 C57
2018-12-08 08:44:39 S 03 53 58.848 -11 05 35.95 V C57
2018-12-08 08:44:39 s 1 -172509.69 8 +266225.97 2790.0 C57
2018-12-08 09:14:39 S 03 53 56.422 -11 06 14.04 V C57
2018-12-08 09:14:39 s 1 -172937.09 1 +264764.55 3080.0 C57
2018-12-08 09:42:10 C 03 54 37.90 -11 08 31.5 U T08
2018-12-08 09:44:39 S 03 53 54.134 -11 06 52.60 V C57
2018-12-08 09:44:39 s 1 -173357.84 7 +263293.13 6390.0 C57
2018-12-08 09:54:04 C 03 54 36.92 -11 08 47.2 U T08
2018-12-08 10:05:47 C 03 54 35.94 -11 09 02.9 U T08
2018-12-08 10:14:39 S 03 53 51.790 -11 07 31.37 V C57
2018-12-08 10:14:39 s 1 -173771.89 6 +261811.69 2350.0 C57
2018-12-08 10:17:37 C 03 54 34.95 -11 09 18.6 U T08
2018-12-08 10:44:39 S 03 53 49.558 -11 08 08.95 V C57
2018-12-08 10:44:39 s 1 -174179.16 8 +260320.19 580.0 C57
2018-12-08 11:14:39 S 03 53 47.244 -11 08 46.46 V C57
2018-12-08 11:14:39 s 1 -174579.59 0 +258818.61 680.0 C57
2018-12-08 11:44:39 S 03 53 44.938 -11 09 25.02 V C57
2018-12-08 11:44:39 s 1 -174973.08 8 +257306.93 2250.0 C57
2018-12-08 12:14:39 S 03 53 42.569 -11 10 03.97 V C57
2018-12-08 12:14:39 s 1 -175359.58 9 +255785.11 4890.0 C57
2018-12-08 12:44:39 S 03 53 40.327 -11 10 41.74 V C57
2018-12-08 12:44:39 s 1 -175739.01 7 +254253.12 8200.0 C57
2018-12-08 13:14:39 S 03 53 38.047 -11 11 19.43 V C57
2018-12-08 13:14:39 s 1 -176111.29 4 +252710.94 1760.0 C57
2018-12-08 13:44:39 S 03 53 35.717 -11 11 57.19 V C57
2018-12-08 13:44:39 s 1 -176476.34 4 +251158.54 5150.0 C57
2018-12-08 14:14:39 S 03 53 33.365 -11 12 36.29 V C57
2018-12-08 14:14:39 s 1 -176834.08 8 +249595.89 7930.0 C57
2018-12-08 14:44:39 S 03 53 31.140 -11 13 14.16 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)