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
2020-11-03 12:00:34 C 06 43 46.45 +00 57 40.1 V T08
2020-11-03 12:03:53 C 06 43 46.61 +00 57 35.2 V T08
2020-11-03 12:12:31 C 06 43 46.97 +00 57 21.6 V T08
2020-11-03 12:29:40 C 06 43 47.75 +00 56 55.0 V T08
2020-11-05 11:52:28 C 06 45 58.13 -00 18 00.7 V T05
2020-11-05 11:55:47 C 06 45 58.26 -00 18 06.2 V T05
2020-11-05 12:13:48 C 06 45 59.01 -00 18 35.3 V T05
2020-11-05 12:19:10 C 06 45 59.24 -00 18 43.8 V T05
2020-11-05 12:28:28 C 06 45 59.67 -00 19 00.0 V T05
2020-11-07 12:52:39 C 06 48 06.87 -01 38 51.3 V T08
2020-11-07 12:55:18 C 06 48 06.97 -01 38 55.8 V T08
2020-11-07 12:59:57 C 06 48 07.16 -01 39 03.6 V T08
2020-11-07 13:07:16 C 06 48 07.45 -01 39 16.2 V T08
2020-11-13 10:52:20 C 06 53 44.32 -05 53 00.7 U I41
2020-11-13 10:53:00 C 06 53 44.35 -05 53 02.0 U I41
2020-11-15 09:58:45 C 06 55 23.69 -07 23 55.6 U I41
2020-11-15 09:59:26 C 06 55 23.71 -07 23 56.9 U I41
2020-11-17 12:22:25 C 06 57 02.36 -09 04 46.8 V T05
2020-11-17 12:25:03 C 06 57 02.44 -09 04 51.9 V T05
2020-11-17 12:29:42 C 06 57 02.57 -09 05 01.5 V T05
2020-11-17 12:37:37 C 06 57 02.78 -09 05 17.5 V T05
2020-11-25 14:11:38 C 07 02 04.11 -16 06 42.6 V T05
2020-11-25 14:16:16 C 07 02 04.19 -16 06 53.1 V T05
2020-11-25 15:06:49 C 07 02 05.03 -16 08 49.5 V T05
2020-11-25 15:14:20 C 07 02 05.16 -16 09 06.9 V T05
2020-11-27 10:41:31 C 07 02 55.96 -17 50 38.5 V T08
2020-11-27 10:45:30 C 07 02 56.01 -17 50 47.9 V T08
2020-11-27 10:59:31 C 07 02 56.20 -17 51 21.3 V T08
2020-11-27 11:19:28 C 07 02 56.49 -17 52 08.5 V T08
2020-11-28 13:21:38 C 07 03 22.35 -18 54 05.8 V T05
2020-11-28 13:35:31 C 07 03 22.52 -18 54 39.0 V T05
2020-11-28 15:06:19 C 07 03 23.59 -18 58 15.9 V T05
2020-11-29 10:37:30 C 07 03 42.68 -19 45 15.0 V T05
2020-11-29 10:40:08 C 07 03 42.71 -19 45 21.4 V T05
2020-11-29 10:46:32 C 07 03 42.79 -19 45 36.9 V T05
2020-11-29 10:55:07 C 07 03 42.87 -19 45 57.9 V T05
2020-11-30 12:45:06 C 07 04 03.88 -20 48 48.1 V T08
2020-11-30 12:51:47 C 07 04 03.93 -20 49 04.3 V T08
2020-11-30 13:30:21 C 07 04 04.26 -20 50 38.5 V T08
2020-11-30 14:12:00 C 07 04 04.61 -20 52 20.4 V T08
2020-12-01 06:40:53 C 07 04 17.60 -21 32 52.0 V V93
2020-12-01 07:23:35 C 07 04 17.99 -21 34 37.3 V V93
2020-12-01 08:06:36 C 07 04 18.30 -21 36 24.4 V V93
2020-12-02 12:12:40 C 07 04 36.63 -22 45 59.4 V T05
2020-12-02 12:19:19 C 07 04 36.66 -22 46 16.0 V T05
2020-12-02 12:26:37 C 07 04 36.70 -22 46 34.2 V T05
2020-12-03 14:36:27 C 07 04 50.68 -23 51 47.9 q E89
2020-12-03 14:40:51 C 07 04 50.68 -23 51 59.4 q E89
2020-12-03 14:44:38 C 07 04 50.68 -23 52 08.2 q E89
2020-12-03 14:48:35 C 07 04 50.70 -23 52 18.3 q E89
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)