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
1998-07-30 22:01:30 C 17 50 24.80 +28 56 18.6 z 620
1998-07-30 22:12:19 C 17 50 24.74 +28 56 07.9 z 620
1998-07-31 22:45:08 C 17 50 34.62 +28 32 43.0 557
1998-07-31 22:48:30 C 17 50 34.66 +28 32 39.2 557
1998-07-31 22:51:50 C 17 50 34.63 +28 32 36.3 557
1998-08-06 20:45:06 C 17 52 19.14 +26 17 06.9 046
1998-08-06 20:45:12 C 17 52 19.09 +26 17 06.8 557
1998-08-06 20:47:31 C 17 52 19.16 +26 17 04.4 046
1998-08-06 20:50:42 C 17 52 19.20 +26 17 01.6 557
1998-08-06 20:53:15 C 17 52 19.24 +26 16 58.8 557
1998-08-06 20:53:50 C 17 52 19.28 +26 16 58.5 046
1998-08-07 21:20:57 C 17 52 45.08 +25 53 43.3 18.3 954
1998-08-07 21:55:03 C 17 52 45.32 +25 53 06.7 046
1998-08-07 22:00:47 C 17 52 45.48 +25 53 01.5 046
1998-08-07 22:11:59 C 17 52 45.63 +25 52 50.5 046
1998-08-07 22:49:28 C 17 52 46.44 +25 52 19.1 17.7 954
1998-08-08 20:58:22 C 17 53 11.88 +25 31 13.7 18.0 954
1998-08-08 21:43:11 C 17 53 12.63 +25 30 31.2 17.9 954
1998-08-10 20:27:17 C 17 54 11.17 +24 46 06.3 046
1998-08-10 20:31:42 C 17 54 11.24 +24 46 01.9 046
1998-08-10 20:34:40 C 17 54 11.31 +24 45 59.4 046
1998-08-11 20:41:20 C 17 54 44.43 +24 23 11.1 046
1998-08-11 20:44:53 C 17 54 44.51 +24 23 07.7 046
1998-08-11 20:47:22 C 17 54 44.56 +24 23 05.4 046
1998-08-11 20:48:54 C 17 54 44.60 +24 23 03.7 046
1998-08-14 20:33:06 C 17 56 34.27 +23 15 40.9 z 587
1998-08-14 20:40:48 C 17 56 34.54 +23 15 33.7 z 587
1998-08-14 21:45:36 C 17 56 36.10 +23 14 32.6 118
1998-08-14 21:54:42 C 17 56 36.33 +23 14 24.3 118
1998-08-15 19:43:07 C 17 57 13.20 +22 54 04.8 046
1998-08-15 19:45:21 C 17 57 13.26 +22 54 02.8 046
1998-08-15 19:46:56 C 17 57 13.28 +22 54 01.4 046
1998-08-15 19:48:31 C 17 57 13.35 +22 53 58.7 046
1998-08-15 20:00:44 C 17 57 13.67 +22 53 49.2 z 108
1998-08-15 20:09:57 C 17 57 13.91 +22 53 41.9 z 108
1998-08-15 20:18:12 C 17 57 13.98 +22 53 35.4 z 108
1998-08-26 05:50:19 C 18 05 50.43 +19 07 57.9 658
1998-08-26 06:09:30 C 18 05 51.13 +19 07 40.9 658
1998-08-26 06:20:50 C 18 05 51.59 +19 07 31.2 658
1998-08-27 22:01:28 C 18 07 28.88 +18 33 07.8 557
1998-08-27 22:05:32 C 18 07 29.07 +18 33 04.1 557
1998-08-28 05:47:10 C 18 07 48.48 +18 26 28.1 658
1998-08-28 05:50:33 C 18 07 48.61 +18 26 25.2 658
1998-08-28 05:58:58 C 18 07 48.92 +18 26 17.9 658
1998-08-29 06:03:36 C 18 08 50.32 +18 05 42.9 658
1998-08-29 06:08:55 C 18 08 50.50 +18 05 38.5 658
1998-08-29 06:28:54 C 18 08 51.34 +18 05 21.2 658
1998-09-17 11:15:59 C 18 32 11.64 +12 10 02.6 360
1998-09-17 11:22:30 C 18 32 11.97 +12 09 58.6 360
1998-09-17 11:40:44 C 18 32 13.01 +12 09 45.8 360
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)