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
2017-07-07 03:19:13 C 12 20 59.68 +14 16 05.8 u H21
2017-07-09 02:03:45 C 12 31 07.80 +14 12 49.4 q W25
2017-07-09 02:35:18 C 12 31 14.53 +14 12 46.0 q W25
2017-07-09 02:55:25 C 12 31 18.84 +14 12 43.5 q W25
2017-07-10 02:58:50 C 12 36 26.79 +14 10 19.1 u H21
2017-07-10 03:01:00 C 12 36 27.25 +14 10 18.6 u H21
2017-07-10 03:03:04 C 12 36 27.67 +14 10 18.6 u H21
2017-07-10 03:05:08 C 12 36 28.10 +14 10 18.5 u H21
2017-07-10 03:07:12 C 12 36 28.53 +14 10 18.2 u H21
2017-07-10 03:09:15 C 12 36 28.97 +14 10 17.6 u H21
2017-07-10 03:11:18 C 12 36 29.40 +14 10 17.3 u H21
2017-07-12 06:10:23 C 12 47 10.90 +14 03 42.6 L T05
2017-07-12 06:11:06 C 12 47 11.04 +14 03 43.0 L T05
2017-07-12 06:25:37 C 12 47 14.04 +14 03 40.7 L T05
2017-07-12 06:36:19 C 12 47 16.22 +14 03 38.8 L T05
2017-07-15 02:05:23 C 13 01 01.51 +13 51 47.9 q W25
2017-07-15 02:23:09 C 13 01 05.05 +13 51 44.5 q W25
2017-07-18 02:23:56 C 13 15 16.17 +13 35 43.8 q H45
2017-07-18 02:26:44 C 13 15 16.66 +13 35 43.3 q H45
2017-07-18 02:28:43 C 13 15 17.07 +13 35 42.9 q H45
2017-07-18 02:30:18 C 13 15 17.37 +13 35 42.2 q H45
2017-07-18 02:31:55 C 13 15 17.70 +13 35 42.1 q H45
2017-07-18 02:34:09 C 13 15 18.11 +13 35 41.4 q H45
2017-07-18 06:09:25 C 13 15 59.75 +13 34 51.5 L T08
2017-07-18 06:10:07 C 13 15 59.90 +13 34 51.2 L T08
2017-07-18 06:10:49 C 13 16 00.06 +13 34 51.0 L T08
2017-07-18 06:22:00 C 13 16 02.13 +13 34 48.3 L T08
2017-07-20 02:12:39 C 13 24 24.61 +13 23 19.5 q W25
2017-07-20 02:23:45 C 13 24 26.65 +13 23 15.7 q W25
2017-07-22 06:07:06 C 13 34 05.49 +13 08 27.4 L T08
2017-07-22 06:08:30 C 13 34 05.74 +13 08 27.0 L T08
2017-07-22 06:09:12 C 13 34 05.86 +13 08 27.3 L T08
2017-07-22 06:22:28 C 13 34 08.29 +13 08 23.1 L T08
2017-07-23 18:08:40 C 13 40 39.96 +12 57 26.4 o K95
2017-07-23 18:16:05 C 13 40 41.29 +12 57 24.2 o K95
2017-07-24 12:32:30 C 13 43 58.47 +12 51 19.5 q D29
2017-07-24 12:52:36 C 13 44 02.03 +12 51 12.8 q D29
2017-07-24 13:12:41 C 13 44 05.59 +12 51 06.0 q D29
2017-07-26 06:07:18 C 13 51 20.92 +12 37 23.6 L T08
2017-07-26 06:09:24 C 13 51 21.29 +12 37 22.9 L T08
2017-07-26 06:21:58 C 13 51 23.47 +12 37 18.4 L T08
2017-07-26 06:22:39 C 13 51 23.60 +12 37 18.2 L T08
2017-07-30 06:06:33 C 14 07 48.24 +12 02 34.0 L T08
2017-07-30 06:07:15 C 14 07 48.36 +12 02 33.8 L T08
2017-07-30 06:08:38 C 14 07 48.61 +12 02 32.9 L T08
2017-07-30 06:24:00 C 14 07 51.13 +12 02 27.7 L T08
2017-08-01 06:07:37 C 14 15 45.17 +11 43 58.7 L T05
2017-08-01 06:09:42 C 14 15 45.52 +11 43 57.9 L T05
2017-08-01 06:10:24 C 14 15 45.63 +11 43 57.8 L T05
2017-08-01 06:23:48 C 14 15 47.79 +11 43 52.1 L T05
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)