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
2010-09-16 07:11:02 C 00 40 34.80 +30 16 01.0 18.5 c 704
2010-09-16 07:29:08 C 00 40 33.79 +30 15 53.9 18.8 c 704
2010-09-16 07:47:34 C 00 40 32.78 +30 15 45.9 19.0 c 704
2010-09-16 08:05:47 C 00 40 31.79 +30 15 39.2 19.0 c 704
2010-09-16 08:23:52 C 00 40 30.83 +30 15 31.7 18.9 c 704
2010-09-30 20:12:59 C 00 20 28.01 +27 01 54.8 r J75
2010-09-30 20:31:14 C 00 20 26.89 +27 01 42.3 r J75
2010-09-30 20:49:31 C 00 20 25.75 +27 01 29.4 r J75
2010-10-07 04:54:08 C 00 11 26.19 +25 06 04.4 r 703
2010-10-07 05:04:00 C 00 11 25.58 +25 05 56.0 r 703
2010-10-07 05:13:50 C 00 11 25.00 +25 05 47.0 r 703
2010-10-09 19:27:25 C 00 07 52.60 +24 14 17.4 u A78
2010-10-09 19:38:25 C 00 07 51.98 +24 14 08.1 u A78
2010-10-09 19:47:34 C 00 07 51.44 +24 14 00.1 u A78
2010-10-09 19:56:42 C 00 07 50.95 +24 13 52.6 u A78
2010-10-14 05:06:50 C 00 02 10.22 +22 42 46.5 u H15
2010-10-14 05:45:29 C 00 02 08.15 +22 42 12.3 u H15
2010-10-14 06:24:14 C 00 02 06.05 +22 41 37.8 u H15
2010-10-14 07:04:36 C 00 02 03.89 +22 41 02.1 u H15
2010-10-14 22:12:12 C 00 01 17.41 +22 27 34.1 r 106
2010-10-14 22:29:56 C 00 01 16.51 +22 27 18.3 r 106
2010-10-14 22:47:42 C 00 01 15.58 +22 27 02.5 r 106
2010-10-14 23:05:26 C 00 01 14.61 +22 26 45.9 r 106
2010-10-15 05:14:08 C 00 00 55.99 +22 21 18.8 19.0 c 704
2010-10-15 05:14:20 C 00 00 56.09 +22 21 18.7 18.5 c 704
2010-10-15 05:33:54 C 00 00 54.98 +22 21 01.4 19.3 c 704
2010-10-15 05:34:07 C 00 00 54.96 +22 21 01.4 18.8 c 704
2010-10-15 05:53:44 C 00 00 53.95 +22 20 43.1 19.4 c 704
2010-10-15 05:53:57 C 00 00 54.00 +22 20 43.8 18.7 c 704
2010-10-15 06:06:00 C 00 00 53.735 +22 20 33.26 L F51
2010-10-15 06:13:32 C 00 00 52.92 +22 20 26.1 19.2 c 704
2010-10-15 06:13:45 C 00 00 52.94 +22 20 25.5 18.8 c 704
2010-10-15 06:23:17 C 00 00 52.825 +22 20 17.90 L F51
2010-10-15 06:33:21 C 00 00 51.89 +22 20 07.8 19.7 c 704
2010-10-15 06:33:34 C 00 00 51.92 +22 20 08.4 18.8 c 704
2010-10-29 03:23:30 C 23 47 09.16 +17 18 03.6 r 703
2010-10-29 03:33:13 C 23 47 08.84 +17 17 54.9 r 703
2010-10-29 03:43:06 C 23 47 08.48 +17 17 46.2 r 703
2010-10-29 03:52:57 C 23 47 08.19 +17 17 36.6 r 703
2010-10-29 21:21:41 C 23 46 36.43 +17 02 03.0 r 106
2010-10-29 21:34:25 C 23 46 36.03 +17 01 51.5 r 106
2010-10-29 21:47:11 C 23 46 35.57 +17 01 40.0 r 106
2010-10-29 21:59:57 C 23 46 35.23 +17 01 28.8 r 106
2010-11-05 03:27:55 C 23 42 56.44 +14 52 46.0 r 703
2010-11-05 03:31:56 C 23 42 56.41 +14 52 43.3 r 703
2010-11-05 03:37:16 C 23 42 56.26 +14 52 39.6 r 703
2010-11-05 03:41:23 C 23 42 56.16 +14 52 35.3 r 703
2010-11-14 02:54:14 C 23 40 23.66 +12 05 25.4 r 703
2010-11-14 03:04:52 C 23 40 23.62 +12 05 19.1 r 703
2010-11-14 03:15:33 C 23 40 23.48 +12 05 11.0 r 703
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)