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 16:34:07	s	1 -48393.486	0 +389144.05	7690.0	–	C57
2021-02-02 16:44:07	S	05 11 59.849	-77 14 13.74	–	V	C57
2021-02-02 16:44:07	s	1 -48737.018	0 +389107.84	1050.0	–	C57
2021-02-02 16:54:07	S	05 11 56.095	-77 14 29.58	–	V	C57
2021-02-02 16:54:07	s	1 -49080.432	0 +389070.70	4260.0	–	C57
2021-02-02 17:04:07	S	05 11 52.793	-77 14 43.44	–	V	C57
2021-02-02 17:04:07	s	1 -49423.729	0 +389032.64	7330.0	–	C57
2021-02-02 17:14:07	S	05 11 49.145	-77 14 58.02	–	V	C57
2021-02-02 17:14:07	s	1 -49766.907	0 +388993.66	240.0	–	C57
2021-02-02 17:24:07	S	05 11 45.566	-77 15 14.72	–	V	C57
2021-02-02 17:24:07	s	1 -50109.965	0 +388953.76	3010.0	–	C57
2021-02-02 17:34:07	S	05 11 41.942	-77 15 28.19	–	V	C57
2021-02-02 17:34:07	s	1 -50452.903	0 +388912.94	5620.0	–	C57
2021-02-02 17:44:07	S	05 11 38.700	-77 15 42.91	–	V	C57
2021-02-02 17:44:07	s	1 -50795.720	0 +388871.19	8080.0	–	C57
2021-02-02 17:54:07	S	05 11 35.270	-77 15 57.89	–	V	C57
2021-02-02 17:54:07	s	1 -51138.414	0 +388828.52	390.0	–	C57
2021-02-02 18:04:07	S	05 11 31.582	-77 16 12.29	–	V	C57
2021-02-02 18:04:07	s	1 -51480.986	0 +388784.93	2530.0	–	C57
2021-02-02 18:14:07	S	05 11 28.586	-77 16 27.91	–	V	C57
2021-02-02 18:14:07	s	1 -51823.435	0 +388740.42	4520.0	–	C57
2021-02-02 18:24:07	S	05 11 24.828	-77 16 43.39	–	V	C57
2021-02-02 18:24:07	s	1 -52165.759	0 +388694.98	6350.0	–	C57
2021-02-02 18:34:07	S	05 11 21.617	-77 16 58.87	–	V	C57
2021-02-02 18:34:07	s	1 -52507.957	0 +388648.63	8020.0	–	C57
2021-02-02 18:44:07	S	05 11 17.957	-77 17 12.80	–	V	C57
2021-02-02 18:44:07	s	1 -52850.030	0 +388601.35	9530.0	–	C57
2021-02-02 18:54:07	S	05 11 14.539	-77 17 27.17	–	V	C57
2021-02-02 18:54:07	s	1 -53191.976	0 +388553.15	880.0	–	C57
2021-02-02 19:04:07	S	05 11 10.742	-77 17 42.43	–	V	C57
2021-02-02 19:04:07	s	1 -53533.794	0 +388504.03	2050.0	–	C57
2021-02-02 19:14:07	S	05 11 07.414	-77 17 56.94	–	V	C57
2021-02-02 19:14:07	s	1 -53875.483	0 +388453.99	3070.0	–	C57
2021-02-02 19:24:07	S	05 11 03.982	-77 18 11.81	–	V	C57
2021-02-02 19:24:07	s	1 -54217.044	0 +388403.03	3910.0	–	C57
2021-02-02 19:34:07	S	05 11 00.564	-77 18 27.18	–	V	C57
2021-02-02 19:34:07	s	1 -54558.474	0 +388351.15	4590.0	–	C57
2021-02-02 19:44:07	S	05 10 56.630	-77 18 41.47	–	V	C57
2021-02-02 19:44:07	s	1 -54899.773	0 +388298.35	5090.0	–	C57
2021-02-02 19:54:07	S	05 10 53.093	-77 18 56.12	–	V	C57
2021-02-02 19:54:07	s	1 -55240.941	0 +388244.63	5420.0	–	C57
2021-02-02 20:04:07	S	05 10 49.666	-77 19 10.85	–	V	C57
2021-02-02 20:04:07	s	1 -55581.976	0 +388189.98	5580.0	–	C57
2021-02-02 20:14:07	S	05 10 45.991	-77 19 25.64	–	V	C57
2021-02-02 20:14:07	s	1 -55922.878	0 +388134.42	5560.0	–	C57
2021-02-02 20:24:07	S	05 10 42.828	-77 19 41.45	–	V	C57
2021-02-02 20:24:07	s	1 -56263.645	0 +388077.94	5370.0	–	C57
2021-02-02 20:34:07	S	05 10 39.658	-77 19 55.42	–	V	C57
2021-02-02 20:34:07	s	1 -56604.278	0 +388020.54	5000.0	–	C57
2021-02-02 20:44:07	S	05 10 36.072	-77 20 10.32	–	V	C57

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12538 (1998 OH)