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
2018-11-01 13:29:08 C 04 49 11.36 +10 02 00.1 U T05
2018-11-01 13:32:44 C 04 49 11.26 +10 01 55.8 U T05
2018-11-01 14:00:43 C 04 49 10.42 +10 01 22.2 U T05
2018-11-01 14:10:23 C 04 49 10.14 +10 01 10.7 U T05
2018-11-02 13:47:20 C 04 48 30.21 +09 32 47.1 U T08
2018-11-02 14:01:52 C 04 48 29.75 +09 32 29.0 U T08
2018-11-02 14:16:20 C 04 48 29.27 +09 32 11.7 U T08
2018-11-04 08:21:32 C 04 47 10.55 +08 40 06.0 V 703
2018-11-04 08:29:06 C 04 47 10.29 +08 39 56.7 V 703
2018-11-04 08:36:41 C 04 47 10.03 +08 39 47.1 V 703
2018-11-04 08:44:16 C 04 47 09.75 +08 39 37.4 V 703
2018-11-05 09:54:55 C 04 46 17.27 +08 07 36.9 V G96
2018-11-05 10:02:02 C 04 46 17.01 +08 07 28.1 V G96
2018-11-05 10:09:10 C 04 46 16.74 +08 07 19.0 V G96
2018-11-05 10:16:20 C 04 46 16.46 +08 07 09.8 V G96
2018-11-05 12:04:14 C 04 46 12.29 +08 04 51.1 o 691
2018-11-05 12:12:11 C 04 46 11.99 +08 04 40.8 o 691
2018-11-05 12:20:09 C 04 46 11.69 +08 04 30.6 o 691
2018-11-06 13:05:45 C 04 45 16.74 +07 32 24.5 U T08
2018-11-06 13:14:04 C 04 45 16.40 +07 32 13.7 U T08
2018-11-06 13:20:18 C 04 45 16.14 +07 32 05.7 U T08
2018-11-06 13:28:40 C 04 45 15.79 +07 31 54.5 U T08
2018-11-06 13:34:48 C 04 45 15.54 +07 31 46.5 U T08
2018-11-06 13:43:13 C 04 45 15.20 +07 31 35.7 U T08
2018-11-06 13:46:06 C 04 45 15.085 +07 31 31.43 U F52
2018-11-06 13:49:19 C 04 45 14.95 +07 31 27.6 U T08
2018-11-06 13:57:39 C 04 45 14.59 +07 31 16.5 U T08
2018-11-06 14:06:35 C 04 45 14.238 +07 31 04.54 U F52
2018-11-06 14:27:05 C 04 45 13.392 +07 30 37.58 U F52
2018-11-07 02:53:51 C 04 44 44.46 +07 14 12.0 16.5 q J43
2018-11-07 03:05:43 C 04 44 43.97 +07 13 56.2 16.6 q J43
2018-11-07 03:17:33 C 04 44 43.47 +07 13 40.8 16.6 q J43
2018-11-07 03:29:21 C 04 44 42.97 +07 13 25.0 16.5 q J43
2018-11-07 22:10:07 C 04 43 58.13 +06 48 28.0 16.9 V Z43
2018-11-07 22:27:23 C 04 43 57.40 +06 48 04.9 16.8 V Z43
2018-11-07 22:43:20 C 04 43 56.68 +06 47 43.4 16.9 V Z43
2018-11-07 22:55:29 C 04 43 56.15 +06 47 27.1 17.0 V Z43
2018-11-07 23:08:34 C 04 43 55.62 +06 47 09.6 V Z43
2018-11-08 03:25:52 C 04 43 44.27 +06 41 27.0 17.1 q J43
2018-11-08 03:37:59 C 04 43 43.73 +06 41 10.7 17.0 q J43
2018-11-08 03:50:07 C 04 43 43.19 +06 40 54.3 17.1 q J43
2018-11-08 04:02:14 C 04 43 42.65 +06 40 38.0 17.0 q J43
2018-11-08 07:54:14 C 04 43 33.36 +06 35 25.1 V 703
2018-11-08 08:01:45 C 04 43 33.03 +06 35 14.8 V 703
2018-11-08 08:09:16 C 04 43 32.68 +06 35 04.6 V 703
2018-11-08 08:16:48 C 04 43 32.34 +06 34 54.2 V 703
2018-11-08 13:26:51 C 04 43 18.72 +06 27 57.2 U T05
2018-11-08 13:41:25 C 04 43 18.03 +06 27 37.4 U T05
2018-11-08 13:55:53 C 04 43 17.38 +06 27 17.8 U T05
2018-11-08 14:10:14 C 04 43 16.74 +06 26 58.3 U 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)