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
2025-07-24 13:22:11 C 22 09 31.205 +33 55 31.22 V T05
2025-07-26 09:08:01 C 22 07 16.939 +34 01 27.12 V T08
2025-07-26 09:16:08 C 22 07 16.495 +34 01 28.27 V T08
2025-07-26 09:35:50 C 22 07 15.401 +34 01 30.86 V T08
2025-07-26 09:42:56 C 22 07 15.026 +34 01 32.09 V T08
2025-07-29 13:02:37 C 22 03 07.687 +34 07 09.48 V T05
2025-07-29 13:15:36 C 22 03 06.922 +34 07 09.88 V T05
2025-07-29 13:29:53 C 22 03 06.089 +34 07 10.20 V T05
2025-07-29 13:38:56 C 22 03 05.563 +34 07 10.70 V T05
2025-07-31 10:48:34 C 22 00 30.118 +34 07 38.32 V T08
2025-07-31 10:51:52 C 22 00 29.938 +34 07 38.35 V T08
2025-07-31 10:56:30 C 22 00 29.664 +34 07 38.32 V T08
2025-07-31 11:12:51 C 22 00 28.680 +34 07 37.27 V T08
2025-08-02 10:25:19 C 21 57 40.462 +34 05 42.90 V T05
2025-08-02 10:29:53 C 21 57 40.178 +34 05 42.47 V T05
2025-08-02 10:34:27 C 21 57 39.878 +34 05 42.32 V T05
2025-08-02 10:42:18 C 21 57 39.377 +34 05 42.18 V T05
2025-08-05 10:40:50 C 21 53 14.026 +33 57 59.98 V T08
2025-08-05 10:43:28 C 21 53 13.846 +33 57 59.65 V T08
2025-08-05 10:47:26 C 21 53 13.596 +33 57 58.90 V T08
2025-08-05 11:00:08 C 21 53 12.802 +33 57 57.71 V T08
2025-08-06 10:29:57 C 21 51 44.381 +33 54 10.04 V T05
2025-08-06 10:40:09 C 21 51 43.730 +33 54 08.10 V T05
2025-08-06 11:15:20 C 21 51 41.431 +33 54 02.09 V T05
2025-08-09 11:15:34 C 21 47 06.336 +33 38 29.47 V T08
2025-08-09 11:20:12 C 21 47 05.950 +33 38 28.21 V T08
2025-08-09 11:30:52 C 21 47 05.237 +33 38 26.56 V T08
2025-08-09 11:58:40 C 21 47 03.346 +33 38 19.46 V T08
2025-08-14 21:31:24 B 21 38 42.612 +32 55 28.70 Z R49
2025-08-14 22:36:38 B 21 38 38.297 +32 55 02.68 Z R49
2025-08-14 23:32:40 B 21 38 34.572 +32 54 40.18 Z R49
2025-08-15 11:34:59 C 21 37 47.837 +32 49 45.59 V T05
2025-08-15 11:36:58 C 21 37 47.722 +32 49 44.90 V T05
2025-08-15 11:46:56 C 21 37 47.062 +32 49 40.80 V T05
2025-08-15 11:48:55 C 21 37 46.920 +32 49 40.04 V T05
2025-08-15 11:58:59 C 21 37 46.243 +32 49 35.65 V T05
2025-08-15 12:00:59 C 21 37 46.128 +32 49 34.79 V T05
2025-08-15 12:11:13 C 21 37 45.413 +32 49 30.11 V T05
2025-08-15 12:13:14 C 21 37 45.274 +32 49 29.35 V T05
2025-08-20 11:23:13 C 21 30 13.399 +31 52 01.74 V T05
2025-08-20 11:47:11 C 21 30 11.875 +31 51 48.28 V T05
2025-08-20 11:59:12 C 21 30 11.110 +31 51 41.87 V T05
2025-08-23 01:49:16 C 21 26 25.510 +31 16 06.17 V R17
2025-08-23 02:15:06 C 21 26 23.923 +31 15 50.40 V R17
2025-08-23 02:43:59 C 21 26 22.138 +31 15 32.72 V R17
2025-08-23 03:06:15 C 21 26 20.784 +31 15 19.19 V R17
2025-08-23 08:21:15 C 21 26 02.551 +31 12 08.82 V T05
2025-08-23 08:33:13 C 21 26 01.807 +31 12 01.76 V T05
2025-08-23 08:45:09 C 21 26 01.080 +31 11 54.10 V T05
2025-08-23 08:57:20 C 21 26 00.334 +31 11 46.90 V T05
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)