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
2023-03-31 09:26:35 C 20 07 14.136 -09 23 20.76 V W68
2023-03-31 09:31:15 C 20 07 14.606 -09 23 13.60 V W68
2023-03-31 09:35:17 C 20 07 14.993 -09 23 07.26 V W68
2023-03-31 09:44:20 C 20 07 15.886 -09 22 52.93 V W68
2023-04-01 03:16:20 C 20 09 00.139 -08 55 31.55 V M22
2023-04-01 03:22:18 C 20 09 00.763 -08 55 22.01 V M22
2023-04-01 03:29:40 C 20 09 01.442 -08 55 10.78 V M22
2023-04-01 03:46:19 C 20 09 03.031 -08 54 45.14 V M22
2023-04-02 09:24:19 C 20 11 56.772 -08 08 42.90 V W68
2023-04-02 09:39:01 C 20 11 58.166 -08 08 20.29 V W68
2023-04-02 09:51:40 C 20 11 59.340 -08 07 59.88 V W68
2023-04-08 09:08:53 C 20 25 16.786 -04 29 06.94 V W68
2023-04-08 09:13:33 C 20 25 17.225 -04 29 00.64 V W68
2023-04-08 09:43:59 C 20 25 19.855 -04 28 14.66 V W68
2023-04-08 09:52:00 C 20 25 20.513 -04 28 02.82 V W68
2023-04-11 09:26:57 C 20 31 33.372 -02 41 03.80 V W68
2023-04-11 09:34:28 C 20 31 33.989 -02 40 52.82 V W68
2023-04-11 09:56:46 C 20 31 35.830 -02 40 19.81 V W68
2023-04-11 10:06:09 C 20 31 36.617 -02 40 05.66 V W68
2023-04-14 09:17:17 C 20 37 30.838 -00 55 19.70 V W68
2023-04-14 09:27:36 C 20 37 31.634 -00 55 04.94 V W68
2023-04-14 09:42:59 C 20 37 32.837 -00 54 43.02 V W68
2023-04-14 09:45:39 C 20 37 33.070 -00 54 38.12 V W68
2023-04-16 03:29:35 C 20 40 53.026 +00 06 01.44 V M22
2023-04-16 03:35:50 C 20 40 53.508 +00 06 10.15 V M22
2023-04-16 03:40:11 C 20 40 53.842 +00 06 16.31 V M22
2023-04-16 03:49:07 C 20 40 54.533 +00 06 29.70 V M22
2023-04-16 09:19:44 C 20 41 20.582 +00 14 27.31 V W68
2023-04-16 09:44:22 C 20 41 22.447 +00 15 03.06 V W68
2023-04-16 09:51:10 C 20 41 22.963 +00 15 12.89 V W68
2023-04-16 10:06:04 C 20 41 24.137 +00 15 34.67 V W68
2023-04-20 08:40:31 C 20 48 34.656 +02 30 44.71 V W68
2023-04-20 08:45:06 C 20 48 34.978 +02 30 50.94 V W68
2023-04-20 08:59:21 C 20 48 36.019 +02 31 11.28 V W68
2023-04-20 09:07:14 C 20 48 36.557 +02 31 22.62 V W68
2023-04-22 07:43:32 C 20 51 58.111 +03 36 52.24 V W68
2023-04-22 07:47:30 C 20 51 58.375 +03 36 58.03 V W68
2023-04-22 08:21:37 C 20 52 00.732 +03 37 45.77 V W68
2023-04-22 08:37:42 C 20 52 01.870 +03 38 07.87 V W68
2023-04-24 10:55:58 C 20 55 31.328 +04 47 50.75 V 703
2023-04-24 11:01:46 C 20 55 31.703 +04 47 58.70 V 703
2023-04-24 11:07:34 C 20 55 32.092 +04 48 06.91 V 703
2023-04-24 11:13:22 C 20 55 32.473 +04 48 14.83 V 703
2023-04-24 11:22:25 C 20 55 33.085 +04 48 27.36 V G96
2023-04-24 11:28:33 C 20 55 33.488 +04 48 35.89 V G96
2023-04-24 11:37:06 C 20 55 34.057 +04 48 47.70 V G96
2023-04-24 11:43:13 C 20 55 34.460 +04 48 56.16 V G96
2023-04-24 14:06:24 C 20 55 44.292 +04 52 15.48 U F52
2023-04-24 14:19:18 C 20 55 45.144 +04 52 33.29 U F52
2023-04-24 14:32:13 C 20 55 45.997 +04 52 51.19 U F52
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)