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
2018-11-10 12:46:54 C 04 41 10.63 +05 22 48.1 U T08
2018-11-10 13:01:29 C 04 41 09.86 +05 22 27.4 U T08
2018-11-10 13:03:29 C 04 41 09.79 +05 22 24.6 U T08
2018-11-10 13:15:56 C 04 41 09.17 +05 22 07.0 U T08
2018-11-10 13:18:02 C 04 41 09.05 +05 22 04.3 U T08
2018-11-11 07:58:22 C 04 40 15.50 +04 55 47.5 V G96
2018-11-11 08:05:49 C 04 40 15.10 +04 55 37.0 V G96
2018-11-11 08:06:54 C 04 40 15.04 +04 55 35.5 V 703
2018-11-11 08:13:15 C 04 40 14.71 +04 55 26.5 V G96
2018-11-11 08:14:25 C 04 40 14.64 +04 55 24.8 V 703
2018-11-11 08:20:39 C 04 40 14.33 +04 55 16.0 V G96
2018-11-11 08:21:56 C 04 40 14.24 +04 55 14.2 V 703
2018-11-11 08:29:27 C 04 40 13.85 +04 55 03.8 V 703
2018-11-12 12:44:36 C 04 38 48.21 +04 14 51.1 U T05
2018-11-12 12:59:04 C 04 38 47.43 +04 14 30.3 U T05
2018-11-12 13:13:28 C 04 38 46.62 +04 14 09.7 U T05
2018-11-12 13:27:51 C 04 38 45.84 +04 13 48.9 U T05
2018-11-12 16:31:31 C 04 38 36.81 +04 09 22.8 q D29
2018-11-12 16:51:53 C 04 38 35.69 +04 08 53.5 q D29
2018-11-12 17:12:14 C 04 38 34.57 +04 08 24.2 q D29
2018-11-12 23:40:06 C 04 38 14.48 +03 59 01.8 V Z80
2018-11-12 23:42:36 C 04 38 14.33 +03 58 58.5 V Z80
2018-11-12 23:45:06 C 04 38 14.19 +03 58 54.8 V Z80
2018-11-12 23:47:36 C 04 38 14.05 +03 58 51.0 V Z80
2018-11-12 23:50:07 C 04 38 13.92 +03 58 47.7 V Z80
2018-11-12 23:52:38 C 04 38 13.77 +03 58 43.8 V Z80
2018-11-12 23:55:26 C 04 38 13.63 +03 58 39.8 V Z80
2018-11-12 23:57:56 C 04 38 13.48 +03 58 36.2 V Z80
2018-11-13 00:00:26 C 04 38 13.37 +03 58 32.7 V Z80
2018-11-14 00:17:15 C 04 36 55.07 +03 23 17.9 q C95
2018-11-14 00:27:59 C 04 36 54.45 +03 23 02.3 q C95
2018-11-14 07:41:53 C 04 36 30.46 +03 12 30.6 V 703
2018-11-14 07:57:32 C 04 36 29.70 +03 12 07.1 V 703
2018-11-14 08:05:09 C 04 36 29.22 +03 11 55.8 V 703
2018-11-14 08:14:38 C 04 36 28.75 +03 11 40.6 V 703
2018-11-14 12:00:55 C 04 36 16.00 +03 06 11.3 U T08
2018-11-14 12:15:32 C 04 36 15.14 +03 05 49.9 U T08
2018-11-14 12:30:10 C 04 36 14.26 +03 05 28.5 U T08
2018-11-14 12:44:49 C 04 36 13.39 +03 05 06.7 U T08
2018-11-15 07:43:39 C 04 35 09.32 +02 37 03.8 V 703
2018-11-15 07:51:27 C 04 35 08.84 +02 36 52.4 V 703
2018-11-15 07:59:13 C 04 35 08.38 +02 36 40.8 V 703
2018-11-15 08:07:01 C 04 35 07.90 +02 36 29.2 V 703
2018-11-15 15:44:39 S 04 34 56.606 +02 23 22.78 V C57
2018-11-15 15:44:39 s 1 +107036.61 5 -36570.410 9280.0 C57
2018-11-15 16:14:39 S 04 34 54.818 +02 22 35.26 V C57
2018-11-15 16:14:39 s 1 +109001.12 2 -33620.309 3890.0 C57
2018-11-15 16:44:39 S 04 34 53.297 +02 21 47.38 V C57
2018-11-15 16:44:39 s 1 +110899.22 4 -30649.714 8160.0 C57
2018-11-15 17:14:39 S 04 34 51.574 +02 21 02.05 V C57
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)