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
2019-04-14 15:50:33 C 05 38 25.59 -13 28 24.5 q C97
2019-04-14 15:52:44 C 05 38 25.96 -13 28 21.9 q C97
2019-04-15 05:30:54 C 05 40 26.84 -13 12 36.1 V T08
2019-04-15 05:34:54 C 05 40 27.45 -13 12 31.6 V T08
2019-04-15 05:41:42 C 05 40 28.39 -13 12 23.2 V T08
2019-04-15 05:51:50 C 05 40 29.86 -13 12 11.0 V T08
2019-04-18 05:31:13 C 05 51 36.84 -11 39 56.3 V T08
2019-04-18 05:32:34 C 05 51 37.09 -11 39 54.5 V T08
2019-04-18 05:35:20 C 05 51 37.50 -11 39 50.3 V T08
2019-04-18 05:38:08 C 05 51 37.96 -11 39 46.5 V T08
2019-04-18 05:42:08 C 05 51 38.59 -11 39 40.9 V T08
2019-04-18 05:46:23 C 05 51 39.28 -11 39 34.8 V T08
2019-04-18 05:51:45 C 05 51 40.12 -11 39 27.4 V T08
2019-04-18 05:57:18 C 05 51 40.97 -11 39 19.3 V T08
2019-04-21 15:37:39 C 06 05 37.82 -09 31 21.4 q C97
2019-04-21 15:39:50 C 06 05 38.35 -09 31 17.7 q C97
2019-04-21 15:42:01 C 06 05 38.71 -09 31 13.8 q C97
2019-04-21 15:44:12 C 06 05 39.01 -09 31 09.6 q C97
2019-04-22 05:36:34 C 06 08 10.76 -09 06 35.2 V T08
2019-04-22 05:46:04 C 06 08 12.45 -09 06 17.9 V T08
2019-04-22 05:59:04 C 06 08 14.79 -09 05 54.1 V T08
2019-04-22 06:13:26 C 06 08 17.36 -09 05 28.3 V T08
2019-04-23 05:29:17 C 06 12 39.12 -08 22 11.3 V T08
2019-04-23 05:29:57 C 06 12 39.20 -08 22 10.1 V T08
2019-04-23 05:34:39 C 06 12 40.14 -08 22 03.6 V T08
2019-04-23 05:35:59 C 06 12 40.29 -08 21 58.1 V T08
2019-04-23 05:43:21 C 06 12 41.66 -08 21 43.7 V T08
2019-04-23 05:45:21 C 06 12 42.02 -08 21 39.9 V T08
2019-04-23 05:54:46 C 06 12 43.79 -08 21 21.8 V T08
2019-04-24 16:10:09 C 06 19 26.01 -07 12 34.6 q C97
2019-04-24 16:12:20 C 06 19 26.23 -07 12 34.0 q C97
2019-04-24 16:14:31 C 06 19 26.51 -07 12 27.1 q C97
2019-04-25 05:34:59 C 06 22 09.64 -06 43 56.0 V T05
2019-04-25 05:43:06 C 06 22 11.25 -06 43 38.3 V T05
2019-04-25 05:54:33 C 06 22 13.52 -06 43 13.1 V T05
2019-04-25 06:07:02 C 06 22 16.03 -06 42 45.9 V T05
2019-04-26 16:01:47 C 06 29 25.59 -05 25 38.5 q C97
2019-04-26 16:03:58 C 06 29 26.26 -05 25 32.7 q C97
2019-04-26 16:06:10 C 06 29 26.68 -05 25 27.2 q C97
2019-04-26 16:08:20 C 06 29 27.00 -05 25 22.4 q C97
2019-05-01 15:43:02 C 06 58 20.50 +00 06 36.4 q C97
2019-05-01 15:45:13 C 06 58 21.28 +00 06 44.0 q C97
2019-05-01 15:47:24 C 06 58 21.88 +00 06 51.8 q C97
2019-05-01 15:49:36 C 06 58 22.33 +00 06 58.0 q C97
2019-05-04 15:56:45 C 07 19 11.23 +04 18 24.8 q C97
2019-05-04 15:58:56 C 07 19 11.99 +04 18 33.1 q C97
2019-05-04 16:01:07 C 07 19 12.72 +04 18 40.9 q C97
2019-05-04 16:03:19 C 07 19 13.13 +04 18 48.8 q C97
2019-05-06 19:33:44 C 07 36 00.18 +07 42 59.5 q 160
2019-05-06 19:36:37 C 07 36 01.16 +07 43 11.4 q 160
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)