IAA RAS IAA Minor Planet Database

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
2021-05-02 14:46:39 C 20 34 02.29 +08 06 46.6 – V T08
2021-05-02 16:57:12 S 20 34 00.835 +08 12 24.66 – L C51
2021-05-02 23:13:28 S 20 34 00.47 +08 28 33.8 – L C51
2021-05-04 10:42:12 C 20 33 57.78 +09 58 21.5 – U I41
2021-05-04 10:43:33 C 20 33 57.77 +09 58 24.9 – U I41
2021-05-04 11:07:25 C 20 33 57.49 +09 59 25.4 – V 703
2021-05-04 11:13:21 C 20 33 57.45 +09 59 39.7 – V 703
2021-05-04 11:19:16 C 20 33 57.43 +09 59 54.6 – V 703
2021-05-04 11:25:11 C 20 33 57.35 +10 00 09.3 – V 703
2021-05-04 11:26:53 C 20 33 57.45 +10 00 13.5 – U I41
2021-05-04 11:28:14 C 20 33 57.45 +10 00 16.8 – U I41
2021-05-05 12:24:17 S 20 33 50.31 +11 01 56.6 – L C51
2021-05-05 15:32:25 S 20 33 49.46 +11 09 35.9 – L C51
2021-05-05 18:40:44 S 20 33 48.58 +11 17 13.9 – L C51
2021-05-05 21:48:52 S 20 33 47.59 +11 24 50.3 – L C51
2021-05-06 00:57:11 S 20 33 46.67 +11 32 27.1 – L C51
2021-05-06 02:31:15 S 20 33 46.16 +11 36 14.6 – L C51
2021-05-06 04:05:19 S 20 33 45.67 +11 40 01.3 – L C51
2021-05-06 05:39:23 S 20 33 45.13 +11 43 48.2 – L C51
2021-05-06 08:47:43 S 20 33 44.09 +11 51 21.1 – L C51
2021-05-06 10:21:46 S 20 33 43.57 +11 55 07.0 – L C51
2021-05-06 11:03:32 C 20 33 44.81 +11 56 43.3 – V G96
2021-05-06 11:09:40 C 20 33 44.74 +11 56 58.0 – V G96
2021-05-06 11:15:47 C 20 33 44.63 +11 57 12.6 – V G96
2021-05-06 11:21:53 C 20 33 44.60 +11 57 27.4 – V G96
2021-05-06 11:55:50 S 20 33 42.994 +11 58 52.32 – L C51
2021-05-06 13:29:53 S 20 33 42.46 +12 02 37.7 – L C51
2021-05-06 15:04:08 S 20 33 41.91 +12 06 23.7 – L C51
2021-05-06 18:12:16 S 20 33 40.73 +12 13 52.3 – L C51
2021-05-06 21:20:36 S 20 33 39.52 +12 21 20.8 – L C51
2021-05-07 00:28:44 S 20 33 38.30 +12 28 47.4 – L C51
2021-05-07 03:36:52 S 20 33 37.04 +12 36 12.4 – L C51
2021-05-09 13:28:03 C 20 33 08.69 +14 49 41.9 – V T05
2021-05-09 13:40:28 C 20 33 08.51 +14 50 10.0 – V T05
2021-05-09 13:49:30 C 20 33 08.36 +14 50 30.3 – V T05
2021-05-11 13:44:32 C 20 32 33.32 +16 36 02.3 – V T08
2021-05-11 13:54:08 C 20 32 33.13 +16 36 23.1 – V T08
2021-05-11 14:15:33 C 20 32 32.73 +16 37 09.3 – V T08
2021-05-17 12:25:33 C 20 29 50.67 +21 24 05.3 – V T05
2021-05-17 12:30:10 C 20 29 50.55 +21 24 14.0 – V T05
2021-05-17 12:53:58 C 20 29 49.86 +21 24 59.2 – V T05
2021-05-19 12:26:57 C 20 28 34.91 +22 52 26.3 – V T08
2021-05-19 12:31:36 C 20 28 34.76 +22 52 34.6 – V T08
2021-05-19 12:58:47 C 20 28 33.86 +22 53 23.9 – V T08
2021-05-21 00:42:57 C 20 27 30.38 +23 56 11.6 – V K83
2021-05-21 00:45:03 C 20 27 30.31 +23 56 15.5 – V K83
2021-05-21 00:47:09 C 20 27 30.24 +23 56 19.2 – V K83
2021-05-23 12:30:57 C 20 25 30.34 +25 36 26.2 – V T08
2021-05-23 12:37:57 C 20 25 30.05 +25 36 37.7 – V T08
2021-05-23 12:45:29 C 20 25 29.75 +25 36 50.1 – V T08
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)