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
2021-08-15 08:42:40 C 18 36 18.97 +25 44 23.2 V T08
2021-08-15 08:50:02 C 18 36 18.94 +25 44 16.0 V T08
2021-08-15 08:53:33 C 18 36 18.94 +25 44 12.3 V T08
2021-08-15 08:55:32 C 18 36 18.95 +25 44 11.0 V T08
2021-08-15 09:09:39 C 18 36 18.92 +25 43 57.4 V T08
2021-08-15 09:14:18 C 18 36 18.91 +25 43 52.9 V T08
2021-08-17 08:13:35 C 18 36 26.64 +24 59 18.8 V T05
2021-08-17 08:18:11 C 18 36 26.62 +24 59 14.5 V T05
2021-08-17 08:32:26 C 18 36 26.65 +24 59 00.9 V T05
2021-08-17 08:41:07 C 18 36 26.67 +24 58 52.8 V T05
2021-08-23 09:48:49 C 18 37 48.31 +22 42 03.1 V T08
2021-08-23 09:53:28 C 18 37 48.39 +22 41 58.5 V T08
2021-08-23 10:08:06 C 18 37 48.59 +22 41 45.0 V T08
2021-08-23 10:20:06 C 18 37 48.75 +22 41 33.6 V T08
2021-08-25 08:15:13 C 18 38 32.05 +21 58 49.7 V T05
2021-08-25 08:21:12 C 18 38 32.15 +21 58 44.6 V T05
2021-08-25 08:31:50 C 18 38 32.31 +21 58 34.4 V T05
2021-08-25 08:46:29 C 18 38 32.50 +21 58 20.9 V T05
2021-08-27 06:50:52 C 18 39 23.83 +21 15 52.1 V T08
2021-08-27 07:15:10 C 18 39 24.27 +21 15 29.7 V T08
2021-08-27 07:19:49 C 18 39 24.33 +21 15 25.5 V T08
2021-08-27 07:32:36 C 18 39 24.58 +21 15 13.4 V T08
2021-09-03 05:10:03 C 18 43 28.07 +18 46 30.1 U I41
2021-09-03 06:06:41 C 18 43 29.61 +18 45 40.3 U I41
2021-09-04 08:11:29 C 18 44 16.06 +18 22 58.8 V T08
2021-09-04 08:16:08 C 18 44 16.19 +18 22 54.8 V T08
2021-09-04 08:25:47 C 18 44 16.48 +18 22 46.3 V T08
2021-09-04 08:54:21 C 18 44 17.26 +18 22 21.4 V T08
2021-09-05 05:08:44 C 18 44 54.91 +18 04 50.8 U I41
2021-09-05 06:29:07 C 18 44 57.30 +18 03 41.0 U I41
2021-09-12 19:20:45 C 18 51 24.75 +15 33 39.5 t 240
2021-09-12 19:34:42 C 18 51 25.27 +15 33 29.7 t 240
2021-09-12 19:36:51 C 18 51 25.33 +15 33 27.8 t 240
2021-11-18 02:24:53 C 20 27 47.97 +03 08 02.4 V G96
2021-11-18 02:32:31 C 20 27 48.52 +03 08 01.3 V G96
2021-11-18 02:47:49 C 20 27 49.59 +03 07 58.6 V G96
2021-12-02 01:57:30 C 20 52 34.12 +02 32 28.6 V G96
2021-12-02 02:05:38 C 20 52 34.74 +02 32 27.9 V G96
2021-12-02 02:13:46 C 20 52 35.34 +02 32 27.7 V G96
2021-12-02 02:21:54 C 20 52 35.93 +02 32 27.4 V G96
2022-10-10 13:23:49 C 07 28 04.454 +06 12 04.61 V T08
2022-10-10 13:29:09 C 07 28 05.011 +06 11 58.27 V T08
2022-10-10 13:37:08 C 07 28 05.880 +06 11 49.27 V T08
2022-10-10 13:53:06 C 07 28 07.685 +06 11 32.32 V T08
2022-10-16 14:41:02 C 07 43 55.418 +03 26 28.61 V T05
2022-10-16 15:04:12 C 07 43 57.931 +03 26 00.24 V T05
2022-10-16 15:16:45 C 07 43 59.258 +03 25 45.59 V T05
2022-10-16 15:23:17 C 07 43 59.978 +03 25 37.67 V T05
2022-10-23 08:27:17 C 08 02 05.278 -00 00 31.32 V W68
2022-10-23 08:31:49 C 08 02 05.762 -00 00 37.26 V W68
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)