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
2023-05-27 13:22:59 C 21 31 49.133 +21 13 57.43 V T05
2023-05-27 13:24:17 C 21 31 49.169 +21 13 58.40 V T05
2023-05-27 13:26:14 C 21 31 49.186 +21 14 00.60 V T05
2023-05-27 14:03:49 C 21 31 49.944 +21 14 41.75 V T05
2023-05-29 13:03:11 C 21 32 44.959 +22 05 22.74 V T05
2023-05-29 13:18:42 C 21 32 45.190 +22 05 39.41 V T05
2023-05-29 13:22:36 C 21 32 45.242 +22 05 43.51 V T05
2023-05-29 13:36:14 C 21 32 45.449 +22 05 58.20 V T05
2023-05-31 12:59:38 C 21 33 31.366 +22 56 03.44 V T05
2023-05-31 13:03:32 C 21 33 31.445 +22 56 07.44 V T05
2023-05-31 13:06:48 C 21 33 31.483 +22 56 10.72 V T05
2023-05-31 13:10:42 C 21 33 31.512 +22 56 15.29 V T05
2023-05-31 13:11:21 C 21 33 31.541 +22 56 15.79 V T05
2023-05-31 13:23:22 C 21 33 31.682 +22 56 28.39 V T05
2023-05-31 13:27:27 C 21 33 31.730 +22 56 32.93 V T05
2023-05-31 13:39:25 C 21 33 31.884 +22 56 45.46 V T05
2023-06-01 09:43:10 C 21 33 48.416 +23 17 35.99 V G96
2023-06-01 09:50:33 C 21 33 48.499 +23 17 43.62 V G96
2023-06-01 09:57:57 C 21 33 48.582 +23 17 51.36 V G96
2023-06-01 10:05:19 C 21 33 48.661 +23 17 59.14 V G96
2023-06-08 13:10:44 C 21 34 56.590 +26 07 55.27 V T05
2023-06-08 13:14:39 C 21 34 56.578 +26 07 59.09 V T05
2023-06-08 13:30:02 C 21 34 56.515 +26 08 13.88 V T05
2023-06-08 13:37:19 C 21 34 56.510 +26 08 20.65 V T05
2023-06-10 12:12:16 C 21 34 51.871 +26 51 52.06 V T05
2023-06-10 12:16:12 C 21 34 51.852 +26 51 56.02 V T05
2023-06-10 12:25:43 C 21 34 51.794 +26 52 04.76 V T05
2023-06-10 12:39:51 C 21 34 51.703 +26 52 17.94 V T05
2023-06-16 12:33:35 C 21 33 30.110 +28 58 21.94 V T05
2023-06-16 12:37:29 C 21 33 29.993 +28 58 25.14 V T05
2023-06-16 12:45:05 C 21 33 29.870 +28 58 31.26 V T05
2023-06-16 13:00:21 C 21 33 29.659 +28 58 44.26 V T05
2023-06-17 09:52:11 C 21 33 09.248 +29 15 49.64 V G96
2023-06-17 10:09:04 C 21 33 08.917 +29 16 03.79 V G96
2023-06-17 10:18:22 C 21 33 08.734 +29 16 11.39 V G96
2023-06-17 10:27:40 C 21 33 08.550 +29 16 18.88 V G96
2023-06-18 12:27:42 C 21 32 40.238 +29 37 14.45 V T05
2023-06-18 12:31:56 C 21 32 40.130 +29 37 17.87 V T05
2023-06-18 12:40:04 C 21 32 39.972 +29 37 24.74 V T05
2023-06-18 12:49:03 C 21 32 39.763 +29 37 31.76 V T05
2023-06-26 00:49:24 C 21 27 49.62 +31 47 33.1 V 196
2023-06-26 01:13:49 C 21 27 48.72 +31 47 48.9 V 196
2023-06-28 01:19:37 C 21 26 04.17 +32 17 52.2 X C95
2023-06-28 01:31:24 C 21 26 03.67 +32 17 59.4 X C95
2023-06-28 12:10:26 C 21 25 39.091 +32 24 24.88 V T05
2023-06-28 12:15:40 C 21 25 38.849 +32 24 27.65 V T05
2023-06-28 12:24:23 C 21 25 38.491 +32 24 33.08 V T05
2023-06-28 12:32:45 C 21 25 38.126 +32 24 37.87 V T05
2023-06-28 22:33:56 C 21 25 14.76 +32 30 25.5 X C95
2023-06-28 22:56:02 C 21 25 13.75 +32 30 38.2 X C95
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)