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
2010-11-14 03:26:08 C 23 40 23.37 +12 05 03.3 r 703
2010-11-15 03:29:39 C 23 40 18.07 +11 47 58.9 o 291
2010-11-15 03:35:53 C 23 40 18.04 +11 47 54.6 o 291
2010-11-15 03:43:58 C 23 40 18.02 +11 47 48.9 o 291
2010-11-28 03:41:34 C 23 42 23.90 +08 38 37.1 r 703
2010-11-28 03:51:23 C 23 42 24.08 +08 38 32.4 r 703
2010-11-28 04:01:17 C 23 42 24.15 +08 38 27.3 r 703
2010-11-28 04:11:19 C 23 42 24.40 +08 38 22.7 r 703
2012-06-16 10:00:08 C 00 51 31.27 +23 32 22.6 o 691
2012-06-16 10:18:27 C 00 51 32.30 +23 32 29.9 o 691
2012-06-16 10:36:46 C 00 51 33.33 +23 32 37.3 o 691
2012-06-19 09:46:27 C 00 55 33.62 +24 00 16.6 o 691
2012-06-19 10:04:46 C 00 55 34.52 +24 00 23.5 o 691
2012-06-19 10:23:07 C 00 55 35.58 +24 00 30.8 o 691
2012-06-22 10:02:34 C 00 59 32.24 +24 27 47.8 o 691
2012-06-22 10:20:53 C 00 59 33.21 +24 27 54.8 o 691
2012-06-22 10:39:13 C 00 59 34.21 +24 28 02.1 o 691
2012-09-10 02:14:40 C 01 43 45.91 +30 20 02.6 c A24
2012-09-10 02:16:44 C 01 43 45.80 +30 20 02.8 c A24
2012-09-10 02:37:39 C 01 43 45.18 +30 19 58.3 c A24
2012-09-10 03:01:54 C 01 43 44.48 +30 19 54.6 c A24
2012-09-10 03:22:07 C 01 43 43.86 +30 19 50.3 c A24
2012-09-10 03:24:13 C 01 43 43.87 +30 19 50.5 c A24
2012-09-17 00:19:40 C 01 38 19.84 +29 41 13.5 c A24
2012-09-17 00:21:45 C 01 38 19.78 +29 41 12.8 c A24
2012-09-17 01:28:50 C 01 38 17.15 +29 40 53.4 c A24
2012-09-17 01:29:53 C 01 38 17.04 +29 40 53.2 c A24
2012-09-17 01:30:55 C 01 38 16.99 +29 40 52.4 c A24
2012-09-20 23:37:38 C 01 34 22.83 +29 09 20.8 u D00
2012-09-20 23:51:34 C 01 34 22.19 +29 09 15.6 u D00
2012-09-21 00:34:56 C 01 34 20.26 +29 08 59.3 u D00
2012-09-21 00:50:32 C 01 34 19.45 +29 08 53.4 u D00
2012-10-04 12:23:24 c 01 17 15.912 +26 22 40.19 L F51
2012-10-04 12:36:19 c 01 17 15.111 +26 22 31.75 L F51
2012-10-05 12:27:00 c 01 15 49.906 +26 06 41.31 L F51
2012-10-05 12:44:13 c 01 15 48.840 +26 06 29.57 L F51
2012-10-05 21:23:17 C 01 15 18.12 +26 00 34.4 o 461
2012-10-05 21:37:35 C 01 15 17.25 +26 00 24.9 o 461
2012-10-05 21:51:50 C 01 15 16.36 +26 00 15.0 o 461
2012-10-07 23:45:28 C 01 12 14.75 +25 25 11.8 c A24
2012-10-07 23:47:32 C 01 12 14.63 +25 25 10.2 c A24
2012-10-08 00:08:25 C 01 12 13.33 +25 24 55.2 c A24
2012-10-08 00:32:35 C 01 12 11.81 +25 24 37.8 c A24
2012-10-08 00:52:47 C 01 12 10.54 +25 24 23.4 c A24
2012-10-08 00:54:50 C 01 12 10.42 +25 24 21.9 c A24
2012-10-10 04:45:59 C 01 08 59.71 +24 45 47.9 r G96
2012-10-10 04:55:51 C 01 08 59.06 +24 45 40.4 r G96
2012-10-10 05:05:40 C 01 08 58.45 +24 45 33.0 r G96
2012-10-10 05:15:35 C 01 08 57.80 +24 45 25.4 r G96
2012-10-13 07:37:34 C 01 04 21.40 +23 46 36.8 18.1 c 704
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)