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
2021-02-02 11:44:07	s	1 -38383.747	0 +389791.89	2820.0	–	C57
2021-02-02 11:54:07	S	05 13 39.610	-77 06 58.03	–	V	C57
2021-02-02 11:54:07	s	1 -38730.325	0 +389782.52	9810.0	–	C57
2021-02-02 12:04:07	S	05 13 35.837	-77 07 13.58	–	V	C57
2021-02-02 12:04:07	s	1 -39076.808	0 +389772.23	6700.0	–	C57
2021-02-02 12:54:07	S	05 13 19.260	-77 08 28.43	–	V	C57
2021-02-02 12:54:07	s	1 -40807.791	0 +389706.84	9530.0	–	C57
2021-02-02 13:04:07	S	05 13 15.422	-77 08 43.51	–	V	C57
2021-02-02 13:04:07	s	1 -41153.695	0 +389690.98	5760.0	–	C57
2021-02-02 13:14:07	S	05 13 12.482	-77 08 58.88	–	V	C57
2021-02-02 13:14:07	s	1 -41499.500	0 +389674.19	1870.0	–	C57
2021-02-02 13:24:07	S	05 13 09.101	-77 09 13.50	–	V	C57
2021-02-02 13:24:07	s	1 -41845.204	0 +389656.48	7860.0	–	C57
2021-02-02 13:34:07	S	05 13 05.278	-77 09 30.06	–	V	C57
2021-02-02 13:34:07	s	1 -42190.808	0 +389637.83	3740.0	–	C57
2021-02-02 13:44:07	S	05 13 01.838	-77 09 43.34	–	V	C57
2021-02-02 13:44:07	s	1 -42536.310	0 +389618.27	9500.0	–	C57
2021-02-02 13:54:07	S	05 12 58.327	-77 09 58.57	–	V	C57
2021-02-02 13:54:07	s	1 -42881.709	0 +389597.77	5130.0	–	C57
2021-02-02 14:04:07	S	05 12 54.950	-77 10 13.58	–	V	C57
2021-02-02 14:04:07	s	1 -43227.005	0 +389576.35	650.0	–	C57
2021-02-02 14:14:07	S	05 12 51.391	-77 10 29.21	–	V	C57
2021-02-02 14:14:07	s	1 -43572.197	0 +389554.00	6040.0	–	C57
2021-02-02 14:24:07	S	05 12 47.890	-77 10 44.58	–	V	C57
2021-02-02 14:24:07	s	1 -43917.283	0 +389530.73	1300.0	–	C57
2021-02-02 14:34:07	S	05 12 44.534	-77 10 58.94	–	V	C57
2021-02-02 14:34:07	s	1 -44262.264	0 +389506.54	6440.0	–	C57
2021-02-02 14:44:07	S	05 12 41.158	-77 11 13.38	–	V	C57
2021-02-02 14:44:07	s	1 -44607.138	0 +389481.41	1450.0	–	C57
2021-02-02 14:54:07	S	05 12 37.606	-77 11 30.59	–	V	C57
2021-02-02 14:54:07	s	1 -44951.905	0 +389455.37	6330.0	–	C57
2021-02-02 15:04:07	S	05 12 33.878	-77 11 45.89	–	V	C57
2021-02-02 15:04:07	s	1 -45296.564	0 +389428.39	1080.0	–	C57
2021-02-02 15:14:07	S	05 12 30.958	-77 12 00.43	–	V	C57
2021-02-02 15:14:07	s	1 -45641.113	0 +389400.50	5690.0	–	C57
2021-02-02 15:24:07	S	05 12 27.838	-77 12 13.54	–	V	C57
2021-02-02 15:24:07	s	1 -45985.553	0 +389371.67	180.0	–	C57
2021-02-02 15:34:07	S	05 12 24.689	-77 12 24.88	–	V	C57
2021-02-02 15:34:07	s	1 -46329.882	0 +389341.93	4520.0	–	C57
2021-02-02 15:44:07	S	05 12 20.635	-77 12 42.44	–	V	C57
2021-02-02 15:44:07	s	1 -46674.099	0 +389311.26	8730.0	–	C57
2021-02-02 15:54:07	S	05 12 17.522	-77 12 58.86	–	V	C57
2021-02-02 15:54:07	s	1 -47018.204	0 +389279.66	2810.0	–	C57
2021-02-02 16:04:07	S	05 12 14.093	-77 13 13.73	–	V	C57
2021-02-02 16:04:07	s	1 -47362.197	0 +389247.14	6740.0	–	C57
2021-02-02 16:14:07	S	05 12 10.193	-77 13 28.49	–	V	C57
2021-02-02 16:14:07	s	1 -47706.075	0 +389213.70	530.0	–	C57
2021-02-02 16:24:07	S	05 12 06.586	-77 13 44.15	–	V	C57
2021-02-02 16:24:07	s	1 -48049.838	0 +389179.34	4180.0	–	C57
2021-02-02 16:34:07	S	05 12 03.367	-77 13 58.26	–	V	C57

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12538 (1998 OH)