12538 — IAA Minor Planet Database

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 Period	1.91401747 yr ± 1.35e-09

Physical Parameters

H (abs. magnitude)	15.96
G (slope)	0.15

Orbit Solution

Source	IAA
Solution Date	2026-05-31
RMS Residual	0.272″
Uncertainty	0
Orbit Type	Apollo
MOID	0.029256 AU
Observations Used	10512
Radar Obs Used	1
Gaia Obs Used	113
Oppositions	14
Arc Total	1987-2025
First Observation Used	1987-08-22
Last Observation Used	2025-12-01

Observations (19002)

Date	Type	RA	Dec	Mag	Band	Observatory
2021-01-18 14:34:08	s	1 +38227.927	0 +370683.96	1380.0	–	C57
2021-01-18 14:44:08	S	06 19 37.193	-67 09 58.36	–	V	C57
2021-01-18 14:44:08	s	1 +37887.296	0 +370893.99	8610.0	–	C57
2021-01-18 15:54:08	S	06 19 28.274	-67 12 09.86	–	V	C57
2021-01-18 15:54:08	s	1 +35499.663	0 +372335.46	3100.0	–	C57
2021-01-18 16:14:08	S	06 19 25.651	-67 12 49.14	–	V	C57
2021-01-18 16:14:08	s	1 +34816.480	0 +372738.09	3920.0	–	C57
2021-01-18 16:24:08	S	06 19 24.070	-67 13 06.31	–	V	C57
2021-01-18 16:24:08	s	1 +34474.728	0 +372937.88	9020.0	–	C57
2021-01-18 16:34:08	S	06 19 22.886	-67 13 25.32	–	V	C57
2021-01-18 16:34:08	s	1 +34132.868	0 +373136.65	3930.0	–	C57
2021-01-18 16:44:08	S	06 19 21.619	-67 13 44.51	–	V	C57
2021-01-18 16:44:08	s	1 +33790.904	0 +373334.40	8630.0	–	C57
2021-01-18 16:54:08	S	06 19 20.405	-67 14 04.42	–	V	C57
2021-01-18 16:54:08	s	1 +33448.836	0 +373531.13	3130.0	–	C57
2021-01-18 17:04:08	S	06 19 19.138	-67 14 22.85	–	V	C57
2021-01-18 17:04:08	s	1 +33106.664	0 +373726.84	7440.0	–	C57
2021-01-18 17:14:08	S	06 19 17.702	-67 14 41.32	–	V	C57
2021-01-18 17:14:08	s	1 +32764.390	0 +373921.54	1560.0	–	C57
2021-01-18 17:24:08	S	06 19 16.406	-67 14 59.89	–	V	C57
2021-01-18 17:24:08	s	1 +32422.016	0 +374115.22	5480.0	–	C57
2021-01-18 17:34:08	S	06 19 15.055	-67 15 18.54	–	V	C57
2021-01-18 17:34:08	s	1 +32079.541	0 +374307.88	9210.0	–	C57
2021-01-18 17:44:08	S	06 19 13.949	-67 15 37.33	–	V	C57
2021-01-18 17:44:08	s	1 +31736.967	0 +374499.53	2750.0	–	C57
2021-01-18 17:54:08	S	06 19 12.715	-67 15 56.66	–	V	C57
2021-01-18 17:54:08	s	1 +31394.296	0 +374690.17	6110.0	–	C57
2021-01-18 18:04:08	S	06 19 11.316	-67 16 15.02	–	V	C57
2021-01-18 18:04:08	s	1 +31051.527	0 +374879.80	9280.0	–	C57
2021-01-18 18:14:08	S	06 19 09.850	-67 16 33.17	–	V	C57
2021-01-18 18:14:08	s	1 +30708.663	0 +375068.41	2260.0	–	C57
2021-01-18 18:24:08	S	06 19 08.568	-67 16 51.74	–	V	C57
2021-01-18 18:24:08	s	1 +30365.704	0 +375256.01	5070.0	–	C57
2021-01-18 18:34:08	S	06 19 07.284	-67 17 10.28	–	V	C57
2021-01-18 18:34:08	s	1 +30022.652	0 +375442.60	7690.0	–	C57
2021-01-18 18:44:08	S	06 19 06.166	-67 17 29.76	–	V	C57
2021-01-18 18:44:08	s	1 +29679.506	0 +375628.19	140.0	–	C57
2021-01-18 18:54:08	S	06 19 04.915	-67 17 48.37	–	V	C57
2021-01-18 18:54:08	s	1 +29336.269	0 +375812.76	2410.0	–	C57
2021-01-18 19:04:08	S	06 19 03.379	-67 18 07.74	–	V	C57
2021-01-18 19:04:08	s	1 +28992.942	0 +375996.33	4500.0	–	C57
2021-01-18 19:14:08	S	06 19 02.299	-67 18 25.99	–	V	C57
2021-01-18 19:14:08	s	1 +28649.524	0 +376178.88	6420.0	–	C57
2021-01-18 19:24:08	S	06 19 00.770	-67 18 44.10	–	V	C57
2021-01-18 19:24:08	s	1 +28306.018	0 +376360.44	8170.0	–	C57
2021-01-18 19:34:08	S	06 18 59.611	-67 19 03.79	–	V	C57
2021-01-18 19:34:08	s	1 +27962.425	0 +376540.98	9760.0	–	C57
2021-01-18 19:44:08	S	06 18 58.298	-67 19 22.48	–	V	C57
2021-01-18 19:44:08	s	1 +27618.745	0 +376720.52	1170.0	–	C57
2021-01-18 19:54:08	S	06 18 57.072	-67 19 40.91	–	V	C57

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12538 (1998 OH)