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
2021-01-06 21:34:08	s	1 -37571.971	0 +402269.75	120.0	–	C57
2021-01-06 21:44:08	S	06 43 33.005	-58 01 50.12	–	V	C57
2021-01-06 21:44:08	s	1 -37907.216	0 +402249.74	1010.0	–	C57
2021-01-06 21:54:08	S	06 43 32.110	-58 02 13.16	–	V	C57
2021-01-06 21:54:08	s	1 -38242.374	0 +402228.87	1770.0	–	C57
2021-01-06 22:04:08	S	06 43 31.361	-58 02 33.18	–	V	C57
2021-01-06 22:04:08	s	1 -38577.442	0 +402207.13	2400.0	–	C57
2021-01-06 22:14:08	S	06 43 30.610	-58 02 53.84	–	V	C57
2021-01-06 22:14:08	s	1 -38912.422	0 +402184.52	2900.0	–	C57
2021-01-06 22:24:08	S	06 43 29.671	-58 03 15.95	–	V	C57
2021-01-06 22:24:08	s	1 -39247.311	0 +402161.06	3270.0	–	C57
2021-01-06 22:34:08	S	06 43 29.047	-58 03 37.12	–	V	C57
2021-01-06 22:34:08	s	1 -39582.109	0 +402136.73	3500.0	–	C57
2021-01-06 23:24:08	S	06 43 24.967	-58 05 24.18	–	V	C57
2021-01-06 23:24:08	s	1 -41254.714	0 +402002.11	2650.0	–	C57
2021-01-06 23:34:08	S	06 43 24.132	-58 05 45.67	–	V	C57
2021-01-06 23:34:08	s	1 -41588.953	0 +401972.59	2070.0	–	C57
2021-01-06 23:44:08	S	06 43 23.465	-58 06 06.88	–	V	C57
2021-01-06 23:44:08	s	1 -41923.096	0 +401942.21	1350.0	–	C57
2021-01-06 23:54:08	S	06 43 22.613	-58 06 27.47	–	V	C57
2021-01-06 23:54:08	s	1 -42257.142	0 +401910.97	480.0	–	C57
2021-01-07 00:04:08	S	06 43 21.744	-58 06 50.26	–	V	C57
2021-01-07 00:04:08	s	1 -42591.090	0 +401878.87	9480.0	–	C57
2021-01-07 00:14:08	S	06 43 21.055	-58 07 11.17	–	V	C57
2021-01-07 00:14:08	s	1 -42924.941	0 +401845.90	8330.0	–	C57
2021-01-07 00:24:08	S	06 43 20.112	-58 07 32.38	–	V	C57
2021-01-07 00:24:08	s	1 -43258.693	0 +401812.07	7030.0	–	C57
2021-01-07 00:34:08	S	06 43 19.205	-58 07 53.76	–	V	C57
2021-01-07 00:34:08	s	1 -43592.346	0 +401777.38	5600.0	–	C57
2021-01-07 00:44:08	S	06 43 18.617	-58 08 15.25	–	V	C57
2021-01-07 00:44:08	s	1 -43925.899	0 +401741.82	4010.0	–	C57
2021-01-07 00:54:08	S	06 43 17.702	-58 08 37.00	–	V	C57
2021-01-07 00:54:08	s	1 -44259.350	0 +401705.40	2280.0	–	C57
2021-01-07 01:04:08	S	06 43 17.014	-58 08 57.23	–	V	C57
2021-01-07 01:04:08	s	1 -44592.700	0 +401668.12	400.0	–	C57
2021-01-07 01:24:08	S	06 43 15.300	-58 09 41.00	–	V	C57
2021-01-07 01:24:08	s	1 -45259.092	0 +401590.97	6190.0	–	C57
2021-01-07 01:34:08	S	06 43 14.465	-58 10 01.63	–	V	C57
2021-01-07 01:34:08	s	1 -45592.133	0 +401551.10	3850.0	–	C57
2021-01-07 01:44:08	S	06 43 13.812	-58 10 23.56	–	V	C57
2021-01-07 01:44:08	s	1 -45925.069	0 +401510.37	1370.0	–	C57
2021-01-07 01:54:08	S	06 43 12.984	-58 10 44.15	–	V	C57
2021-01-07 01:54:08	s	1 -46257.900	0 +401468.78	8730.0	–	C57
2021-01-07 02:04:08	S	06 43 12.017	-58 11 06.86	–	V	C57
2021-01-07 02:04:08	s	1 -46590.625	0 +401426.33	5940.0	–	C57
2021-01-07 02:14:08	S	06 43 11.333	-58 11 27.17	–	V	C57
2021-01-07 02:14:08	s	1 -46923.244	0 +401383.01	2990.0	–	C57
2021-01-07 02:24:08	S	06 43 10.538	-58 11 48.30	–	V	C57
2021-01-07 02:24:08	s	1 -47255.755	0 +401338.84	9880.0	–	C57
2021-01-07 02:34:08	S	06 43 09.689	-58 12 10.15	–	V	C57

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12538 (1998 OH)