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 20:44:07	s	1 -56944.775	0 +387962.21	4450.0	–	C57
2021-02-02 20:54:07	S	05 10 32.311	-77 20 25.19	–	V	C57
2021-02-02 20:54:07	s	1 -57285.135	0 +387902.97	3720.0	–	C57
2021-02-02 21:04:07	S	05 10 28.747	-77 20 40.09	–	V	C57
2021-02-02 21:04:07	s	1 -57625.358	0 +387842.81	2800.0	–	C57
2021-02-02 21:14:07	S	05 10 25.313	-77 20 54.85	–	V	C57
2021-02-02 21:14:07	s	1 -57965.442	0 +387781.73	1700.0	–	C57
2021-02-02 21:24:07	S	05 10 21.967	-77 21 09.83	–	V	C57
2021-02-02 21:24:07	s	1 -58305.388	0 +387719.73	420.0	–	C57
2021-02-02 21:34:07	S	05 10 18.230	-77 21 24.44	–	V	C57
2021-02-02 21:34:07	s	1 -58645.194	0 +387656.81	8950.0	–	C57
2021-02-02 21:44:07	S	05 10 14.410	-77 21 38.95	–	V	C57
2021-02-02 21:44:07	s	1 -58984.858	0 +387592.97	7300.0	–	C57
2021-02-02 21:54:07	S	05 10 10.870	-77 21 53.68	–	V	C57
2021-02-02 21:54:07	s	1 -59324.382	0 +387528.22	5450.0	–	C57
2021-02-02 22:04:07	S	05 10 07.260	-77 22 08.58	–	V	C57
2021-02-02 22:04:07	s	1 -59663.763	0 +387462.54	3410.0	–	C57
2021-02-02 22:14:07	S	05 10 03.958	-77 22 24.13	–	V	C57
2021-02-02 22:14:07	s	1 -60003.001	0 +387395.95	1180.0	–	C57
2021-02-02 22:34:07	S	05 09 57.127	-77 22 51.53	–	V	C57
2021-02-02 22:34:07	s	1 -60681.044	0 +387260.00	6140.0	–	C57
2021-02-02 22:44:07	S	05 09 53.275	-77 23 08.02	–	V	C57
2021-02-02 22:44:07	s	1 -61019.848	0 +387190.65	3330.0	–	C57
2021-02-02 22:54:07	S	05 09 49.930	-77 23 23.21	–	V	C57
2021-02-02 22:54:07	s	1 -61358.505	0 +387120.38	310.0	–	C57
2021-02-02 23:04:07	S	05 09 46.649	-77 23 37.54	–	V	C57
2021-02-02 23:04:07	s	1 -61697.015	0 +387049.19	7100.0	–	C57
2021-02-02 23:14:07	S	05 09 43.154	-77 23 51.61	–	V	C57
2021-02-02 23:14:07	s	1 -62035.377	0 +386977.09	3690.0	–	C57
2021-02-02 23:24:07	S	05 09 39.331	-77 24 07.85	–	V	C57
2021-02-02 23:24:07	s	1 -62373.590	0 +386904.06	70.0	–	C57
2021-02-02 23:34:07	S	05 09 35.568	-77 24 21.74	–	V	C57
2021-02-02 23:34:07	s	1 -62711.654	0 +386830.12	6250.0	–	C57
2021-02-02 23:44:07	S	05 09 32.261	-77 24 36.25	–	V	C57
2021-02-02 23:44:07	s	1 -63049.567	0 +386755.26	2230.0	–	C57
2021-02-02 23:54:07	S	05 09 28.980	-77 24 50.69	–	V	C57
2021-02-02 23:54:07	s	1 -63387.328	0 +386679.48	8000.0	–	C57
2021-02-03 00:04:07	S	05 09 24.962	-77 25 05.63	–	V	C57
2021-02-03 00:04:07	s	1 -63724.938	0 +386602.79	3560.0	–	C57
2021-02-03 00:14:07	S	05 09 21.336	-77 25 20.17	–	V	C57
2021-02-03 00:14:07	s	1 -64062.394	0 +386525.17	8910.0	–	C57
2021-02-03 00:24:07	S	05 09 17.851	-77 25 33.78	–	V	C57
2021-02-03 00:24:07	s	1 -64399.697	0 +386446.64	4050.0	–	C57
2021-02-03 00:34:07	S	05 09 14.448	-77 25 49.40	–	V	C57
2021-02-03 00:34:07	s	1 -64736.844	0 +386367.19	8970.0	–	C57
2021-02-03 00:44:07	S	05 09 10.639	-77 26 02.62	–	V	C57
2021-02-03 00:44:07	s	1 -65073.837	0 +386286.83	3690.0	–	C57
2021-02-03 00:54:07	S	05 09 07.284	-77 26 19.50	–	V	C57
2021-02-03 00:54:07	s	1 -65410.673	0 +386205.54	8180.0	–	C57
2021-02-03 01:04:07	S	05 09 04.680	-77 26 31.96	–	V	C57

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12538 (1998 OH)