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
2004-09-16 04:14:26 C 21 39 49.96 +25 33 55.4 19.3 c 704
2004-09-16 04:31:11 C 21 39 49.26 +25 33 40.7 19.6 c 704
2004-09-16 04:48:35 C 21 39 48.57 +25 33 25.5 19.1 c 704
2004-09-16 05:05:16 C 21 39 47.94 +25 33 11.3 19.0 c 704
2004-09-23 04:27:20 C 21 34 20.31 +23 05 04.1 19.4 c 704
2004-09-23 04:44:36 C 21 34 19.83 +23 04 47.9 19.6 c 704
2004-09-23 05:01:52 C 21 34 19.35 +23 04 32.2 19.2 c 704
2004-09-23 05:19:07 C 21 34 18.82 +23 04 17.2 19.0 c 704
2004-10-12 02:05:42 C 21 29 19.04 +16 31 08.5 o 699
2004-10-12 02:29:04 C 21 29 19.19 +16 30 50.3 o 699
2004-10-12 02:52:27 C 21 29 19.20 +16 30 31.1 o 699
2004-10-12 03:15:53 C 21 29 19.17 +16 30 12.1 o 699
2004-10-16 02:11:32 C 21 29 58.80 +15 15 42.2 19.3 c 704
2004-10-16 02:27:13 C 21 29 58.88 +15 15 30.1 19.8 c 704
2004-10-16 02:42:54 C 21 29 59.08 +15 15 18.7 19.6 c 704
2004-10-16 03:14:25 C 21 29 59.34 +15 14 53.2 19.8 c 704
2006-08-13 10:48:40 C 23 26 22.00 +33 16 41.6 o 644
2006-08-13 11:02:46 C 23 26 21.38 +33 16 41.5 o 644
2006-08-13 11:18:32 C 23 26 20.68 +33 16 41.6 o 644
2006-09-06 04:27:18 C 22 55 24.04 +30 49 37.5 19.1 c H55
2006-09-06 04:29:48 C 22 55 23.90 +30 49 35.6 19.1 c H55
2006-09-06 04:32:23 C 22 55 23.73 +30 49 34.4 18.9 c H55
2006-09-06 04:34:53 C 22 55 23.56 +30 49 33.2 19.0 c H55
2006-09-06 04:39:59 C 22 55 23.25 +30 49 30.3 19.0 c H55
2006-09-06 04:45:28 C 22 55 22.91 +30 49 27.4 19.0 c H55
2006-09-20 20:16:17 C 22 35 33.33 +26 50 50.0 o 151
2006-09-20 20:26:11 C 22 35 32.77 +26 50 42.5 o 151
2006-09-20 20:29:55 C 22 35 32.52 +26 50 40.0 o 151
2006-09-21 02:34:03 C 22 35 14.51 +26 45 49.3 o 699
2006-09-21 03:00:23 C 22 35 13.19 +26 45 27.8 o 699
2006-09-21 03:26:42 C 22 35 11.90 +26 45 07.3 o 699
2006-09-21 03:53:03 C 22 35 10.46 +26 44 45.8 o 699
2006-09-28 04:34:14 C 22 27 32.07 +24 22 29.9 r 703
2006-09-28 04:43:35 C 22 27 31.53 +24 22 22.5 r 703
2006-09-28 04:52:58 C 22 27 31.14 +24 22 15.0 r 703
2006-09-28 05:02:17 C 22 27 30.74 +24 22 07.0 r 703
2006-10-15 19:20:21 C 22 16 21.65 +18 09 24.0 r 240
2006-10-15 19:24:44 C 22 16 21.61 +18 09 20.2 r 240
2006-10-15 19:29:08 C 22 16 21.55 +18 09 16.6 r 240
2006-10-15 19:33:30 C 22 16 21.50 +18 09 13.1 r 240
2006-10-15 19:37:53 C 22 16 21.45 +18 09 09.8 r 240
2006-10-15 19:42:16 C 22 16 21.39 +18 09 06.2 r 240
2006-11-14 02:58:14 C 22 22 50.01 +10 01 09.4 r 703
2006-11-14 03:07:39 C 22 22 50.30 +10 01 04.7 r 703
2006-11-14 03:17:01 C 22 22 50.55 +10 01 00.5 r 703
2006-11-14 03:26:21 C 22 22 50.70 +10 00 55.7 r 703
2008-08-17 07:39:41 C 00 15 22.81 +32 40 55.3 o H55
2008-08-17 07:48:08 C 00 15 22.56 +32 40 55.9 o H55
2008-08-17 07:56:34 C 00 15 22.29 +32 40 56.3 o H55
2008-09-23 04:32:14 C 23 30 51.84 +27 51 49.5 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)