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
2021-05-25 12:26:53 C 20 23 41.53 +26 51 59.7 V T05
2021-05-25 12:30:12 C 20 23 41.38 +26 52 04.7 V T05
2021-05-25 12:39:41 C 20 23 40.95 +26 52 19.5 V T05
2021-05-25 12:49:36 C 20 23 40.52 +26 52 34.8 V T05
2021-05-27 00:24:17 C 20 22 12.22 +27 45 51.2 V 089
2021-05-27 00:27:54 C 20 22 12.09 +27 45 56.4 V 089
2021-05-27 00:31:30 C 20 22 11.91 +27 46 02.1 V 089
2021-05-27 00:35:06 C 20 22 11.70 +27 46 07.2 V 089
2021-05-27 00:49:30 C 20 22 11.04 +27 46 28.1 V 089
2021-05-27 00:53:06 C 20 22 10.91 +27 46 33.3 V 089
2021-05-27 13:42:33 C 20 21 37.53 +28 05 23.1 V T08
2021-05-27 13:46:31 C 20 21 37.32 +28 05 28.8 V T08
2021-05-27 14:03:29 C 20 21 36.50 +28 05 53.5 V T08
2021-05-27 14:27:37 C 20 21 35.30 +28 06 28.5 V T08
2021-05-29 00:10:28 C 20 20 04.39 +28 53 59.5 V K83
2021-05-29 00:12:34 C 20 20 04.28 +28 54 02.6 V K83
2021-05-29 00:14:40 C 20 20 04.18 +28 54 05.6 V K83
2021-05-29 00:17:48 C 20 20 04.02 +28 54 09.9 V K83
2021-05-29 12:45:30 C 20 19 28.54 +29 11 24.1 V T05
2021-05-29 12:48:48 C 20 19 28.38 +29 11 28.7 V T05
2021-05-29 13:03:24 C 20 19 27.60 +29 11 48.7 V T05
2021-06-02 11:11:23 C 20 14 36.31 +31 11 59.4 V T05
2021-06-02 11:42:54 C 20 14 34.43 +31 12 37.5 V T05
2021-06-02 11:49:42 C 20 14 34.01 +31 12 45.7 V T05
2021-06-02 12:09:05 C 20 14 32.84 +31 13 09.3 V T05
2021-06-05 12:03:49 C 20 10 20.53 +32 34 07.6 V T08
2021-06-05 12:09:50 C 20 10 20.13 +32 34 14.2 V T08
2021-06-05 12:33:04 C 20 10 18.58 +32 34 39.0 V T08
2021-06-05 12:39:02 C 20 10 18.18 +32 34 45.4 V T08
2021-06-09 10:26:38 C 20 04 13.96 +34 06 02.5 V T08
2021-06-09 11:17:14 C 20 04 10.30 +34 06 48.6 V T08
2021-06-09 11:25:56 C 20 04 09.67 +34 06 56.4 V T08
2021-06-13 11:59:45 C 19 57 16.43 +35 23 47.6 V T08
2021-06-13 12:03:07 C 19 57 16.18 +35 23 50.0 V T08
2021-06-13 12:07:46 C 19 57 15.80 +35 23 53.3 V T08
2021-06-13 22:32:23 C 19 56 29.79 +35 30 56.7 V Z80
2021-06-13 22:37:23 C 19 56 29.41 +35 31 00.4 V Z80
2021-06-13 22:42:22 C 19 56 29.02 +35 31 03.9 V Z80
2021-06-14 06:12:19 C 19 55 55.38 +35 36 13.3 V V93
2021-06-14 06:52:15 C 19 55 52.09 +35 36 40.8 V V93
2021-06-14 07:33:34 C 19 55 48.79 +35 37 08.9 V V93
2021-06-16 03:37:33 C 19 52 28.02 +36 04 48.0 X W34
2021-06-16 03:51:29 C 19 52 26.88 +36 04 56.4 X W34
2021-06-16 04:05:00 C 19 52 25.83 +36 05 04.8 X W34
2021-06-18 04:01:09 C 19 48 40.96 +36 31 03.0 Z W33
2021-06-18 04:12:07 C 19 48 40.07 +36 31 08.8 Z W33
2021-06-18 04:23:07 C 19 48 39.17 +36 31 14.6 Z W33
2021-06-19 09:24:00 C 19 46 20.77 +36 44 55.9 V T05
2021-06-19 09:29:05 C 19 46 20.34 +36 44 58.3 V T05
2021-06-19 09:38:45 C 19 46 19.54 +36 45 02.7 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)