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
2018-09-09 10:39:18 C 04 24 43.79 +23 41 25.4 V G96
2018-09-09 10:46:39 C 04 24 44.16 +23 41 23.7 V G96
2018-09-12 11:02:08 C 04 28 20.61 +23 22 38.6 703
2018-09-12 11:17:10 C 04 28 21.39 +23 22 34.7 703
2018-09-12 11:24:41 C 04 28 21.75 +23 22 33.0 703
2018-09-15 10:38:55 C 04 31 44.89 +23 01 43.7 V 703
2018-09-15 10:46:28 C 04 31 45.22 +23 01 41.0 V 703
2018-09-15 10:54:01 C 04 31 45.53 +23 01 38.7 V 703
2018-09-15 11:01:33 C 04 31 45.87 +23 01 36.7 V 703
2018-09-18 09:31:09 C 04 34 56.08 +22 38 35.6 V 703
2018-09-18 09:38:41 C 04 34 56.42 +22 38 33.6 V 703
2018-09-18 09:46:14 C 04 34 56.78 +22 38 30.2 V 703
2018-09-18 09:53:46 C 04 34 57.23 +22 38 26.6 V 703
2018-10-04 02:11:44 C 04 48 12.69 +19 48 51.0 q 160
2018-10-04 02:15:47 C 04 48 12.84 +19 48 49.0 q 160
2018-10-04 02:19:50 C 04 48 13.00 +19 48 46.6 q 160
2018-10-05 09:55:24 C 04 49 00.06 +19 30 24.7 V 703
2018-10-05 10:02:59 C 04 49 00.20 +19 30 21.6 V 703
2018-10-05 10:10:34 C 04 49 00.36 +19 30 18.3 V 703
2018-10-05 10:18:08 C 04 49 00.49 +19 30 14.7 V 703
2018-10-16 14:12:14 C 04 53 02.45 +16 23 26.1 U T05
2018-10-16 14:33:59 C 04 53 02.50 +16 23 08.1 U T05
2018-10-16 14:46:31 C 04 53 02.58 +16 22 57.9 U T05
2018-10-16 15:06:28 C 04 53 02.61 +16 22 41.8 U T05
2018-10-18 14:07:30 C 04 53 13.51 +15 43 34.7 U T08
2018-10-18 14:31:34 C 04 53 13.49 +15 43 14.2 U T08
2018-10-18 14:45:48 C 04 53 13.51 +15 43 02.1 U T08
2018-10-20 08:29:46 C 04 53 14.79 +15 06 32.0 V 703
2018-10-20 08:38:10 C 04 53 14.69 +15 06 24.7 V 703
2018-10-20 08:46:33 C 04 53 14.65 +15 06 17.0 V 703
2018-10-20 08:54:56 C 04 53 14.62 +15 06 09.5 V 703
2018-10-21 01:47:19 C 04 53 12.52 +14 50 54.7 q 160
2018-10-21 01:51:25 C 04 53 12.45 +14 50 50.3 q 160
2018-10-21 01:55:29 C 04 53 12.36 +14 50 47.2 q 160
2018-10-22 13:44:45 C 04 53 03.26 +14 17 37.6 U T08
2018-10-22 14:19:26 C 04 53 02.99 +14 17 05.4 U T08
2018-10-22 14:31:15 C 04 53 02.88 +14 16 53.8 U T08
2018-10-25 12:16:27 C 04 52 26.88 +13 08 30.4 U T08
2018-10-25 12:28:41 C 04 52 26.74 +13 08 19.3 U T08
2018-10-25 12:31:59 C 04 52 26.72 +13 08 14.8 U T08
2018-10-25 12:46:03 C 04 52 26.51 +13 08 00.0 U T08
2018-10-25 12:56:29 C 04 52 26.37 +13 07 49.9 U T08
2018-10-25 12:59:23 C 04 52 26.33 +13 07 48.0 U T08
2018-10-29 20:27:26 C 04 50 44.78 +11 17 08.5 q D29
2018-10-29 20:52:54 C 04 50 44.19 +11 16 40.2 q D29
2018-10-29 21:18:21 C 04 50 43.61 +11 16 11.4 q D29
2018-11-01 10:16:18 C 04 49 16.58 +10 05 46.7 V 703
2018-11-01 10:23:58 C 04 49 16.34 +10 05 38.6 V 703
2018-11-01 10:31:38 C 04 49 16.11 +10 05 29.2 V 703
2018-11-01 10:39:17 C 04 49 15.91 +10 05 19.5 V 703
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)