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
2017-02-18 19:34:45 C 02 59 24.64 -05 28 03.7 q 160
2017-02-18 19:37:45 C 02 59 24.87 -05 28 03.2 q 160
2017-02-18 19:40:45 C 02 59 25.11 -05 28 02.6 q 160
2017-02-19 19:30:23 C 03 01 16.14 -05 23 43.3 q 160
2017-02-19 19:33:22 C 03 01 16.38 -05 23 42.5 q 160
2017-02-19 19:36:21 C 03 01 16.65 -05 23 41.4 q 160
2017-02-20 01:46:55 C 03 01 45.71 -05 22 33.6 q H45
2017-02-20 01:48:19 C 03 01 45.78 -05 22 33.4 q H45
2017-02-20 01:49:51 C 03 01 45.93 -05 22 32.7 q H45
2017-02-23 01:27:33 C 03 07 30.35 -05 08 55.0 q H45
2017-02-23 01:29:05 C 03 07 30.52 -05 08 54.1 q H45
2017-02-23 01:30:39 C 03 07 30.54 -05 08 54.0 q H45
2017-02-23 01:32:13 C 03 07 30.67 -05 08 54.0 q H45
2017-02-23 01:33:28 C 03 07 30.80 -05 08 53.9 q H45
2017-02-23 01:34:51 C 03 07 30.94 -05 08 53.7 q H45
2017-02-24 01:17:30 C 03 09 28.00 -05 04 11.8 q H45
2017-02-24 01:19:14 C 03 09 28.13 -05 04 11.5 q H45
2017-02-24 01:20:41 C 03 09 28.29 -05 04 11.3 q H45
2017-02-24 01:22:07 C 03 09 28.37 -05 04 11.2 q H45
2017-02-24 01:23:32 C 03 09 28.48 -05 04 11.0 q H45
2017-02-24 01:24:52 C 03 09 28.61 -05 04 10.6 q H45
2017-02-25 19:21:10 C 03 12 59.31 -04 55 42.6 d B66
2017-02-25 20:08:14 C 03 13 03.38 -04 55 32.5 d B66
2017-03-03 01:46:04 C 03 24 03.24 -04 28 48.5 q H45
2017-03-03 01:47:47 C 03 24 03.38 -04 28 47.4 q H45
2017-03-03 01:49:02 C 03 24 03.48 -04 28 47.3 q H45
2017-03-03 01:50:25 C 03 24 03.60 -04 28 47.0 q H45
2017-03-03 01:51:55 C 03 24 03.72 -04 28 46.7 q H45
2017-03-03 01:53:47 C 03 24 03.88 -04 28 45.8 q H45
2017-03-08 18:43:13 C 03 36 50.91 -03 57 39.6 q 160
2017-03-08 18:45:54 C 03 36 51.14 -03 57 38.4 q 160
2017-03-10 19:12:33 C 03 41 34.39 -03 46 14.2 q 160
2017-03-10 19:15:22 C 03 41 34.66 -03 46 13.5 q 160
2017-03-10 19:17:58 C 03 41 34.96 -03 46 13.6 q 160
2017-03-11 01:05:53 C 03 42 09.34 -03 44 47.5 q H45
2017-03-11 01:07:35 C 03 42 09.48 -03 44 47.5 q H45
2017-03-11 01:08:49 C 03 42 09.65 -03 44 47.1 q H45
2017-03-11 01:10:54 C 03 42 09.81 -03 44 46.2 q H45
2017-03-11 01:13:07 C 03 42 10.04 -03 44 45.8 q H45
2017-03-11 01:14:59 C 03 42 10.23 -03 44 45.5 q H45
2017-03-13 01:19:38 C 03 46 58.49 -03 33 08.2 q H45
2017-03-13 01:21:20 C 03 46 58.73 -03 33 08.2 q H45
2017-03-13 01:22:44 C 03 46 58.88 -03 33 08.0 q H45
2017-03-13 01:24:52 C 03 46 59.06 -03 33 07.5 q H45
2017-03-13 01:26:15 C 03 46 59.23 -03 33 07.4 q H45
2017-03-13 01:28:04 C 03 46 59.43 -03 33 06.8 q H45
2017-03-13 18:48:27 C 03 48 44.95 -03 28 52.6 q 160
2017-03-13 18:51:20 C 03 48 45.26 -03 28 52.4 q 160
2017-03-13 18:54:29 C 03 48 45.62 -03 28 52.0 q 160
2017-03-16 18:28:17 C 03 56 09.94 -03 11 02.8 q 160
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)