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
2018-11-16 05:44:39 s 1 +141085.75 3 +48030.093 3220.0 C57
2018-11-16 06:14:39 S 04 34 05.621 +02 00 49.10 V C57
2018-11-16 06:14:39 s 1 +141657.00 2 +50972.016 2440.0 C57
2018-11-16 06:44:39 S 04 34 03.686 +02 00 02.56 V C57
2018-11-16 06:44:39 s 1 +142193.96 4 +53901.605 6610.0 C57
2018-11-16 07:14:39 S 04 34 01.930 +01 59 16.98 V C57
2018-11-16 07:14:39 s 1 +142697.46 8 +56818.515 100.0 C57
2018-11-16 07:44:39 S 04 34 00.031 +01 58 30.25 V C57
2018-11-16 07:44:39 s 1 +143168.32 1 +59722.429 7220.0 C57
2018-11-16 08:14:39 S 04 33 58.111 +01 57 44.17 V C57
2018-11-16 08:14:39 s 1 +143607.30 6 +62613.054 2150.0 C57
2018-11-16 08:44:39 S 04 33 56.227 +01 56 57.84 V C57
2018-11-16 08:44:39 s 1 +144015.18 6 +65490.121 8990.0 C57
2018-11-16 09:14:39 S 04 33 54.437 +01 56 13.56 V C57
2018-11-16 09:14:39 s 1 +144392.70 0 +68353.385 1740.0 C57
2018-11-16 09:44:39 S 04 33 52.519 +01 55 27.59 V C57
2018-11-16 09:44:39 s 1 +144740.56 9 +71202.620 4300.0 C57
2018-11-16 10:14:39 S 04 33 50.530 +01 54 39.82 V C57
2018-11-16 10:14:39 s 1 +145059.49 1 +74037.622 480.0 C57
2018-11-16 10:44:39 S 04 33 48.722 +01 53 53.66 V C57
2018-11-16 10:44:39 s 1 +145350.14 7 +76858.201 4010.0 C57
2018-11-16 11:14:39 S 04 33 46.781 +01 53 09.92 V C57
2018-11-16 11:14:39 s 1 +145613.19 6 +79664.189 8500.0 C57
2018-11-16 11:44:39 S 04 33 44.964 +01 52 23.66 V C57
2018-11-16 11:44:39 s 1 +145849.28 1 +82455.432 7500.0 C57
2018-11-16 12:08:19 C 04 33 29.17 +01 54 46.6 U T05
2018-11-16 12:14:39 S 04 33 43.078 +01 51 39.13 V C57
2018-11-16 12:14:39 s 1 +146059.02 5 +85231.789 4470.0 C57
2018-11-16 12:23:27 C 04 33 28.22 +01 54 23.7 U T05
2018-11-16 12:40:08 C 04 33 27.16 +01 53 59.0 U T05
2018-11-16 12:44:39 S 04 33 41.088 +01 50 52.37 V C57
2018-11-16 12:44:39 s 1 +146243.03 4 +87993.135 2770.0 C57
2018-11-16 13:14:39 S 04 33 39.218 +01 50 05.93 V C57
2018-11-16 13:14:39 s 1 +146401.89 7 +90739.358 5690.0 C57
2018-11-16 13:44:39 S 04 33 37.423 +01 49 20.53 V C57
2018-11-16 13:44:39 s 1 +146536.18 7 +93470.358 6440.0 C57
2018-11-16 14:14:39 S 04 33 35.340 +01 48 33.62 V C57
2018-11-16 14:14:39 s 1 +146646.46 0 +96186.046 8150.0 C57
2018-11-16 14:44:39 S 04 33 33.463 +01 47 48.19 V C57
2018-11-16 14:44:39 s 1 +146733.25 7 +98886.344 3850.0 C57
2018-11-16 15:14:39 S 04 33 31.550 +01 47 03.30 V C57
2018-11-16 15:14:39 s 1 +146797.10 5 +101571.18 6540.0 C57
2018-11-16 15:44:39 S 04 33 29.594 +01 46 15.64 V C57
2018-11-16 15:44:39 s 1 +146838.51 3 +104240.50 9110.0 C57
2018-11-16 16:14:39 S 04 33 27.715 +01 45 32.69 V C57
2018-11-16 16:14:39 s 1 +146857.98 1 +106894.25 4390.0 C57
2018-11-16 16:44:39 S 04 33 25.716 +01 44 45.53 V C57
2018-11-16 16:44:39 s 1 +146855.99 0 +109532.40 5150.0 C57
2018-11-16 17:14:39 S 04 33 23.878 +01 44 02.00 V C57
2018-11-16 17:14:39 s 1 +146833.01 2 +112154.89 4080.0 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)