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
2019-09-04 19:46:34 C 17 27 18.55 +12 05 16.4 q 160
2019-09-04 19:49:37 C 17 27 18.84 +12 05 14.4 q 160
2019-09-04 19:52:39 C 17 27 19.03 +12 05 12.5 q 160
2020-08-15 19:21:21 C 04 31 59.80 +22 35 11.9 q D29
2020-08-15 19:41:43 C 04 32 01.41 +22 35 08.7 q D29
2020-08-15 20:02:04 C 04 32 03.04 +22 35 05.5 q D29
2020-09-17 13:43:02 C 05 33 02.81 +18 38 41.1 V T08
2020-09-17 13:50:45 C 05 33 03.41 +18 38 37.8 V T08
2020-09-17 13:55:24 C 05 33 03.76 +18 38 35.2 V T08
2020-09-17 14:11:25 C 05 33 04.92 +18 38 26.2 V T08
2020-09-18 11:40:41 C 05 34 40.08 +18 27 43.5 U I41
2020-09-18 12:27:18 C 05 34 43.46 +18 27 20.1 U I41
2020-09-20 11:38:04 C 05 38 11.16 +18 02 50.5 U I41
2020-09-20 12:25:14 C 05 38 14.53 +18 02 25.6 U I41
2020-10-01 10:10:31 C 05 56 49.73 +15 20 16.4 U I41
2020-10-01 12:02:27 C 05 56 57.29 +15 18 57.0 U I41
2020-10-01 12:03:50 C 05 56 57.38 +15 18 56.0 U I41
2020-10-03 10:36:14 C 06 00 08.43 +14 44 56.3 U I41
2020-10-03 12:02:04 C 06 00 14.11 +14 43 52.3 U I41
2020-10-11 15:06:18 C 06 13 05.23 +12 01 57.9 V T08
2020-10-11 15:12:19 C 06 13 05.67 +12 01 51.4 V T08
2020-10-11 15:16:58 C 06 13 05.94 +12 01 47.0 V T08
2020-10-11 15:21:05 C 06 13 06.24 +12 01 43.2 V T08
2020-10-13 09:39:37 C 06 15 47.01 +11 22 05.5 U I41
2020-10-13 10:12:33 C 06 15 49.02 +11 21 34.1 U I41
2020-10-14 13:23:04 C 06 17 30.61 +10 55 15.7 V T08
2020-10-14 13:26:25 C 06 17 30.81 +10 55 12.7 V T08
2020-10-14 13:38:22 C 06 17 31.53 +10 55 00.7 V T08
2020-10-15 09:09:59 C 06 18 44.02 +10 35 35.7 U I41
2020-10-15 11:04:32 C 06 18 50.87 +10 33 41.1 U I41
2020-10-18 12:56:44 C 06 23 18.68 +09 16 47.5 V T08
2020-10-18 13:02:03 C 06 23 18.99 +09 16 41.6 V T08
2020-10-18 13:09:21 C 06 23 19.42 +09 16 33.7 V T08
2020-10-18 13:18:01 C 06 23 19.92 +09 16 24.3 V T08
2020-10-21 10:09:32 C 06 27 21.18 +07 59 26.5 U I41
2020-10-21 10:36:58 C 06 27 22.70 +07 58 54.8 U I41
2020-10-23 09:23:42 C 06 30 01.87 +07 03 38.1 U I41
2020-10-23 10:35:43 C 06 30 05.76 +07 02 11.1 U I41
2020-10-23 11:00:24 C 06 30 07.08 +07 01 41.3 U I41
2020-10-30 10:58:58 C 06 39 03.19 +03 21 23.5 V G96
2020-10-30 11:07:32 C 06 39 03.60 +03 21 11.4 V G96
2020-10-30 11:16:06 C 06 39 04.01 +03 20 59.4 V G96
2020-10-30 11:24:35 C 06 39 04.41 +03 20 47.3 V G96
2020-10-31 12:17:23 C 06 40 19.27 +02 45 08.7 V T08
2020-10-31 12:20:03 C 06 40 19.39 +02 45 05.0 V T08
2020-10-31 12:31:51 C 06 40 19.95 +02 44 47.7 V T08
2020-11-01 12:36:06 C 06 41 30.75 +02 09 29.2 V T05
2020-11-01 12:42:38 C 06 41 31.07 +02 09 20.1 V T05
2020-11-01 12:46:35 C 06 41 31.21 +02 09 14.0 V T05
2020-11-01 12:56:29 C 06 41 31.69 +02 08 58.8 V 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)