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
2021-02-01 20:14:07	S	05 18 51.499	-76 42 58.32	–	V	C57
2021-02-01 20:24:07	S	05 18 48.382	-76 43 14.34	–	V	C57
2021-02-01 20:44:07	S	05 18 42.158	-76 43 44.36	–	V	C57
2021-02-01 20:54:07	S	05 18 38.748	-76 43 59.27	–	V	C57
2021-02-01 21:04:07	S	05 18 35.426	-76 44 16.19	–	V	C57
2021-02-01 21:14:07	S	05 18 32.354	-76 44 31.24	–	V	C57
2021-02-01 21:24:07	S	05 18 28.867	-76 44 46.64	–	V	C57
2021-02-01 21:34:07	S	05 18 25.762	-76 45 01.58	–	V	C57
2021-02-01 21:44:07	S	05 18 22.752	-76 45 17.78	–	V	C57
2021-02-01 21:54:07	S	05 18 19.625	-76 45 33.80	–	V	C57
2021-02-01 22:04:07	S	05 18 15.950	-76 45 48.38	–	V	C57
2021-02-01 22:14:07	S	05 18 12.634	-76 46 05.20	–	V	C57
2021-02-01 22:14:07	s	1 -10074.677	0 +387440.95	6010.0	–	C57
2021-02-01 22:24:07	S	05 18 09.430	-76 46 19.27	–	V	C57
2021-02-01 22:24:07	s	1 -10426.128	0 +387507.78	6820.0	–	C57
2021-02-01 22:34:07	S	05 18 06.250	-76 46 36.19	–	V	C57
2021-02-01 22:34:07	s	1 -10777.552	0 +387573.65	7650.0	–	C57
2021-02-01 22:44:07	S	05 18 03.091	-76 46 52.14	–	V	C57
2021-02-01 22:44:07	s	1 -11128.949	0 +387638.57	8480.0	–	C57
2021-02-01 22:54:07	S	05 17 59.602	-76 47 06.94	–	V	C57
2021-02-01 22:54:07	s	1 -11480.317	0 +387702.53	9320.0	–	C57
2021-02-01 23:04:07	S	05 17 56.664	-76 47 22.06	–	V	C57
2021-02-01 23:04:07	s	1 -11831.655	0 +387765.54	170.0	–	C57
2021-02-01 23:14:07	S	05 17 52.942	-76 47 37.25	–	V	C57
2021-02-01 23:14:07	s	1 -12182.963	0 +387827.59	1020.0	–	C57
2021-02-01 23:24:07	S	05 17 49.942	-76 47 54.42	–	V	C57
2021-02-01 23:24:07	s	1 -12534.240	0 +387888.70	1870.0	–	C57
2021-02-01 23:34:07	S	05 17 46.922	-76 48 08.24	–	V	C57
2021-02-01 23:34:07	s	1 -12885.485	0 +387948.85	2730.0	–	C57
2021-02-01 23:44:07	S	05 17 43.325	-76 48 23.90	–	V	C57
2021-02-01 23:44:07	s	1 -13236.698	0 +388008.05	3590.0	–	C57
2021-02-01 23:54:07	S	05 17 40.320	-76 48 38.88	–	V	C57
2021-02-01 23:54:07	s	1 -13587.876	0 +388066.30	4440.0	–	C57
2021-02-02 00:04:07	S	05 17 36.893	-76 48 55.08	–	V	C57
2021-02-02 00:04:07	s	1 -13939.020	0 +388123.59	5300.0	–	C57
2021-02-02 00:14:07	S	05 17 33.430	-76 49 09.70	–	V	C57
2021-02-02 00:14:07	s	1 -14290.129	0 +388179.94	6150.0	–	C57
2021-02-02 00:24:07	S	05 17 30.528	-76 49 25.50	–	V	C57
2021-02-02 00:24:07	s	1 -14641.201	0 +388235.34	6990.0	–	C57
2021-02-02 00:34:07	S	05 17 27.146	-76 49 41.12	–	V	C57
2021-02-02 00:34:07	s	1 -14992.237	0 +388289.78	7830.0	–	C57
2021-02-02 00:44:07	S	05 17 23.885	-76 49 56.39	–	V	C57
2021-02-02 00:44:07	s	1 -15343.235	0 +388343.28	8660.0	–	C57
2021-02-02 00:54:07	S	05 17 20.225	-76 50 11.62	–	V	C57
2021-02-02 00:54:07	s	1 -15694.193	0 +388395.82	9480.0	–	C57
2021-02-02 01:04:07	S	05 17 17.398	-76 50 27.35	–	V	C57
2021-02-02 01:04:07	s	1 -16045.113	0 +388447.42	290.0	–	C57
2021-02-02 01:14:07	S	05 17 13.973	-76 50 43.26	–	V	C57
2021-02-02 01:14:07	s	1 -16395.992	0 +388498.07	1090.0	–	C57
2021-02-02 01:24:07	S	05 17 10.728	-76 50 58.02	–	V	C57

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12538 (1998 OH)