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
2025-08-27 10:31:48 C 21 20 24.146 +30 07 49.69 V T05
2025-08-27 10:43:45 C 21 20 23.434 +30 07 41.34 V T05
2025-08-27 10:55:46 C 21 20 22.786 +30 07 33.10 V T05
2025-08-27 11:07:55 C 21 20 22.090 +30 07 24.35 V T05
2025-08-29 09:30:37 C 21 17 52.490 +29 34 14.48 V T08
2025-08-29 09:35:53 C 21 17 52.186 +29 34 10.31 V T08
2025-08-29 09:43:13 C 21 17 51.756 +29 34 05.34 V T08
2025-08-29 09:59:43 C 21 17 50.906 +29 33 53.06 V T08
2025-08-30 05:13:24 C 21 16 51.107 +29 19 36.91 V G96
2025-08-30 05:20:52 C 21 16 50.711 +29 19 31.40 V G96
2025-08-30 05:28:20 C 21 16 50.315 +29 19 25.86 V G96
2025-08-30 05:35:47 C 21 16 49.912 +29 19 20.21 V G96
2025-09-01 09:27:08 C 21 14 14.426 +28 39 41.98 V T05
2025-09-01 09:31:03 C 21 14 14.273 +28 39 38.52 V T05
2025-09-01 09:44:14 C 21 14 13.598 +28 39 28.94 V T05
2025-09-01 09:57:45 C 21 14 12.871 +28 39 18.04 V T05
2025-09-06 08:54:47 C 21 08 55.238 +27 02 20.33 V T05
2025-09-06 08:58:44 C 21 08 55.073 +27 02 17.23 V T05
2025-09-06 09:09:57 C 21 08 54.552 +27 02 08.09 V T05
2025-09-06 09:26:06 C 21 08 53.954 +27 01 53.98 V T05
2025-09-14 09:35:09 C 21 02 24.148 +24 13 25.10 X F51
2025-09-14 10:11:57 C 21 02 23.090 +24 12 51.76 X F51
2025-09-14 10:30:17 C 21 02 22.572 +24 12 35.12 X F51
2025-09-16 03:46:39 C 21 01 20.220 +23 35 19.80 V G96
2025-09-16 03:56:27 C 21 01 19.970 +23 35 11.00 V G96
2025-09-16 04:06:14 C 21 01 19.730 +23 35 02.00 V G96
2025-09-16 04:16:02 C 21 01 19.460 +23 34 53.40 V G96
2025-09-17 08:29:46 C 21 00 40.774 +23 09 21.06 V T05
2025-09-17 08:33:51 C 21 00 40.649 +23 09 17.71 V T05
2025-09-17 08:41:28 C 21 00 40.462 +23 09 10.66 V T05
2025-09-17 08:57:44 C 21 00 40.006 +23 08 56.11 V T05
2025-09-18 21:03:04 B 20 59 56.05 +22 36 10.4 W D51
2025-09-18 21:18:07 B 20 59 55.76 +22 35 56.5 W D51
2025-09-18 23:29:37 B 20 59 53.04 +22 33 56.6 W D51
2025-09-29 07:35:43 C 20 57 23.911 +18 52 29.35 V T05
2025-09-29 07:40:18 C 20 57 23.894 +18 52 25.14 V T05
2025-09-29 07:49:07 C 20 57 23.892 +18 52 17.08 V T05
2025-09-29 08:03:53 C 20 57 23.822 +18 52 04.04 V T05
2025-09-30 07:41:52 C 20 57 23.047 +18 31 39.68 V T05
2025-09-30 07:45:57 C 20 57 23.052 +18 31 36.80 V T05
2025-09-30 07:55:09 C 20 57 23.040 +18 31 27.73 V T05
2025-09-30 08:19:37 C 20 57 22.966 +18 31 06.96 V T05
2025-10-16 20:08:10 B 21 02 12.60 +13 20 54.9 W D51
2025-10-16 20:28:14 B 21 02 13.00 +13 20 41.6 W D51
2025-10-18 20:49:04 B 21 03 23.41 +12 47 37.2 W D51
2025-10-18 21:01:36 B 21 03 23.73 +12 47 28.9 W D51
2025-10-18 21:11:38 B 21 03 24.00 +12 47 21.9 W D51
2025-11-14 11:15:12 C 21 27 50.32 +07 21 21.3 V D29
2025-11-14 11:55:56 C 21 27 52.24 +07 21 06.3 V D29
2025-12-01 02:14:23 C 21 49 12.029 +05 34 28.67 V G96
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)