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
2017-03-16 18:31:07 C 03 56 10.31 -03 11 02.2 q 160
2017-03-19 19:04:10 C 04 03 55.40 -02 52 21.5 o K95
2017-03-19 19:07:58 C 04 03 55.78 -02 52 20.2 o K95
2017-05-27 05:57:27 C 08 26 55.86 +08 20 32.1 L T05
2017-05-27 06:07:24 C 08 26 58.02 +08 20 37.2 L T05
2017-05-27 06:42:01 C 08 27 05.76 +08 20 58.2 L T05
2017-05-27 07:05:31 C 08 27 11.02 +08 21 12.7 L T05
2017-06-18 03:48:50 C 10 33 29.76 +13 01 33.2 q 703
2017-06-18 03:57:20 C 10 33 31.85 +13 01 36.6 q 703
2017-06-18 04:05:53 C 10 33 33.93 +13 01 39.7 q 703
2017-06-18 04:14:19 C 10 33 35.98 +13 01 42.9 q 703
2017-06-20 06:13:28 C 10 45 55.13 +13 19 37.2 L T08
2017-06-20 06:22:39 C 10 45 57.37 +13 19 40.1 L T08
2017-06-20 06:34:23 C 10 46 00.22 +13 19 43.8 L T08
2017-06-20 06:35:05 C 10 46 00.41 +13 19 43.5 L T08
2017-06-23 03:50:24 C 11 02 57.25 +13 40 34.8 q 703
2017-06-23 03:58:52 C 11 02 59.33 +13 40 36.8 q 703
2017-06-23 04:07:17 C 11 03 01.34 +13 40 38.7 q 703
2017-06-23 04:15:42 C 11 03 03.39 +13 40 41.5 q 703
2017-06-24 06:11:24 C 11 09 21.16 +13 47 22.2 L T08
2017-06-24 06:21:20 C 11 09 23.53 +13 47 24.5 L T08
2017-06-24 06:22:03 C 11 09 23.72 +13 47 24.1 L T08
2017-06-24 06:40:01 C 11 09 28.01 +13 47 28.2 L T08
2017-06-28 06:10:51 C 11 32 20.72 +14 06 10.3 L T08
2017-06-28 06:20:48 C 11 32 23.04 +14 06 11.6 L T08
2017-06-28 06:32:36 C 11 32 25.79 +14 06 13.1 L T08
2017-06-28 06:33:18 C 11 32 25.99 +14 06 13.2 L T08
2017-07-02 06:10:50 C 11 54 43.32 +14 15 57.4 L T08
2017-07-02 06:11:32 C 11 54 43.46 +14 15 57.6 L T08
2017-07-02 06:22:52 C 11 54 46.05 +14 15 57.8 L T08
2017-07-02 06:37:13 C 11 54 49.31 +14 15 58.7 L T08
2017-07-06 06:10:03 C 12 16 20.52 +14 17 02.9 L T08
2017-07-06 06:10:45 C 12 16 20.70 +14 17 03.1 L T08
2017-07-06 06:21:25 C 12 16 23.05 +14 17 02.4 L T08
2017-07-06 06:37:16 C 12 16 26.50 +14 17 02.1 L T08
2017-07-07 02:47:34 C 12 20 52.77 +14 16 07.5 u H21
2017-07-07 02:49:57 C 12 20 53.30 +14 16 07.3 u H21
2017-07-07 02:52:01 C 12 20 53.76 +14 16 07.2 u H21
2017-07-07 02:54:05 C 12 20 54.19 +14 16 07.1 u H21
2017-07-07 02:56:09 C 12 20 54.66 +14 16 07.3 u H21
2017-07-07 02:58:13 C 12 20 55.10 +14 16 07.0 u H21
2017-07-07 03:00:16 C 12 20 55.55 +14 16 07.1 u H21
2017-07-07 03:02:20 C 12 20 55.98 +14 16 06.8 u H21
2017-07-07 03:04:23 C 12 20 56.44 +14 16 06.6 u H21
2017-07-07 03:06:25 C 12 20 56.88 +14 16 06.5 u H21
2017-07-07 03:08:28 C 12 20 57.31 +14 16 06.3 u H21
2017-07-07 03:10:31 C 12 20 57.79 +14 16 06.2 u H21
2017-07-07 03:12:34 C 12 20 58.21 +14 16 06.2 u H21
2017-07-07 03:14:37 C 12 20 58.65 +14 16 06.1 u H21
2017-07-07 03:16:39 C 12 20 59.11 +14 16 05.9 u H21
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)