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
2002-10-08 19:59:50 C 20 40 37.23 +14 30 44.1 c 621
2002-10-09 19:53:57 C 20 41 08.58 +14 13 03.5 c 621
2002-10-09 20:17:31 C 20 41 09.13 +14 12 45.6 c 621
2002-10-09 20:23:02 C 20 41 09.22 +14 12 41.9 c 621
2002-10-09 20:28:34 C 20 41 09.34 +14 12 37.8 c 621
2002-10-09 20:34:07 C 20 41 09.47 +14 12 33.5 c 621
2002-11-28 02:02:15 C 21 33 42.90 +05 19 32.8 c 711
2002-11-28 02:18:48 C 21 33 43.90 +05 19 30.4 c 711
2002-11-28 02:35:21 C 21 33 44.80 +05 19 26.8 c 711
2004-06-24 23:48:40 C 22 55 47.10 +27 49 06.6 o 461
2004-06-24 23:51:50 C 22 55 47.12 +27 49 08.6 o 461
2004-06-24 23:55:00 C 22 55 47.17 +27 49 10.5 o 461
2004-06-24 23:58:10 C 22 55 47.19 +27 49 12.4 o 461
2004-07-03 23:06:31 C 22 57 01.05 +29 50 54.6 r 185
2004-07-03 23:23:41 C 22 57 01.06 +29 51 03.2 r 185
2004-07-04 01:20:49 C 22 57 00.90 +29 52 06.5 r 170
2004-07-04 01:25:51 C 22 57 00.90 +29 52 08.9 r 170
2004-07-04 01:33:24 C 22 57 00.88 +29 52 12.9 r 170
2004-07-31 22:36:17 C 22 41 01.69 +33 39 55.5 r 941
2004-07-31 22:40:50 C 22 41 01.42 +33 39 56.2 r 941
2004-07-31 22:45:48 C 22 41 01.16 +33 39 56.7 r 941
2004-07-31 22:57:35 C 22 41 00.59 +33 39 57.9 r 941
2004-07-31 23:15:44 C 22 40 59.69 +33 40 00.0 r 941
2004-08-24 20:56:51 C 22 08 00.41 +31 52 19.8 c A30
2004-08-24 21:00:44 C 22 08 00.17 +31 52 18.1 c A30
2004-08-24 21:01:32 C 22 08 00.10 +31 52 16.9 c A30
2004-08-24 21:05:10 C 22 07 59.92 +31 52 15.9 c A30
2004-08-25 06:53:10 C 22 07 23.36 +31 47 29.0 19.0 c 704
2004-08-25 07:07:41 C 22 07 22.36 +31 47 22.6 20.1 c 704
2004-08-25 07:22:17 C 22 07 21.52 +31 47 14.9 18.9 c 704
2004-08-25 07:36:56 C 22 07 20.56 +31 47 07.0 19.2 c 704
2004-08-25 07:51:30 C 22 07 19.55 +31 46 59.5 19.1 c 704
2004-08-26 05:49:56 C 22 05 58.66 +31 35 48.9 19.0 c 704
2004-08-26 06:06:06 C 22 05 57.68 +31 35 41.2 19.4 c 704
2004-08-26 06:20:47 C 22 05 56.73 +31 35 33.4 19.2 c 704
2004-08-26 06:35:29 C 22 05 55.82 +31 35 25.2 19.5 c 704
2004-08-26 06:50:41 C 22 05 54.78 +31 35 17.8 19.1 c 704
2004-08-27 22:13:16 C 22 03 30.75 +31 14 00.4 r 240
2004-08-27 22:17:53 C 22 03 30.45 +31 13 58.0 r 240
2004-08-27 22:25:35 C 22 03 29.96 +31 13 52.8 r 240
2004-09-06 05:38:11 C 21 50 46.00 +28 47 36.3 18.8 c 704
2004-09-06 05:55:34 C 21 50 45.01 +28 47 24.2 18.6 c 704
2004-09-06 06:27:56 C 21 50 43.24 +28 46 59.6 19.1 c 704
2004-09-06 06:43:54 C 21 50 42.35 +28 46 47.4 18.9 c 704
2004-09-09 22:11:29 C 21 46 19.28 +27 39 13.5 r 938
2004-09-15 05:48:27 C 21 40 42.56 +25 53 14.4 18.8 c 704
2004-09-15 06:05:17 C 21 40 41.82 +25 53 00.8 19.2 c 704
2004-09-15 06:21:55 C 21 40 41.10 +25 52 45.8 19.2 c 704
2004-09-15 06:38:30 C 21 40 40.47 +25 52 31.6 19.3 c 704
2004-09-16 03:57:35 C 21 39 50.62 +25 34 10.5 19.2 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)