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 12:14:07	s	1 +11028.651	0 +381666.42	5230.0	–	C57
2021-02-01 12:24:07	S	05 21 21.475	-76 30 40.64	–	V	C57
2021-02-01 12:24:07	s	1 +10677.192	0 +381791.41	7870.0	–	C57
2021-02-01 12:34:07	S	05 21 18.137	-76 30 57.06	–	V	C57
2021-02-01 12:34:07	s	1 +10325.706	0 +381915.42	410.0	–	C57
2021-02-01 12:44:07	S	05 21 14.892	-76 31 13.30	–	V	C57
2021-02-01 12:54:07	S	05 21 11.851	-76 31 28.20	–	V	C57
2021-02-01 13:04:07	S	05 21 08.609	-76 31 44.18	–	V	C57
2021-02-01 13:14:07	S	05 21 05.722	-76 31 59.77	–	V	C57
2021-02-01 13:24:07	S	05 21 02.609	-76 32 15.25	–	V	C57
2021-02-01 13:34:07	S	05 20 59.398	-76 32 31.38	–	V	C57
2021-02-01 13:44:07	S	05 20 56.405	-76 32 46.79	–	V	C57
2021-02-01 13:54:07	S	05 20 53.086	-76 33 02.81	–	V	C57
2021-02-01 14:04:07	S	05 20 49.891	-76 33 18.94	–	V	C57
2021-02-01 14:14:07	S	05 20 46.776	-76 33 35.06	–	V	C57
2021-02-01 14:24:07	S	05 20 43.598	-76 33 49.50	–	V	C57
2021-02-01 14:34:07	S	05 20 40.349	-76 34 06.10	–	V	C57
2021-02-01 14:44:07	S	05 20 36.907	-76 34 21.43	–	V	C57
2021-02-01 14:54:07	S	05 20 33.878	-76 34 38.10	–	V	C57
2021-02-01 15:04:07	S	05 20 30.838	-76 34 53.94	–	V	C57
2021-02-01 15:14:07	S	05 20 27.518	-76 35 09.10	–	V	C57
2021-02-01 15:24:07	S	05 20 24.504	-76 35 23.50	–	V	C57
2021-02-01 15:34:07	S	05 20 21.288	-76 35 39.95	–	V	C57
2021-02-01 15:44:07	S	05 20 18.089	-76 35 55.21	–	V	C57
2021-02-01 15:54:07	S	05 20 15.108	-76 36 10.91	–	V	C57
2021-02-01 16:04:07	S	05 20 11.880	-76 36 27.86	–	V	C57
2021-02-01 16:14:07	S	05 20 08.659	-76 36 42.88	–	V	C57
2021-02-01 16:24:07	S	05 20 05.352	-76 36 58.82	–	V	C57
2021-02-01 16:34:07	S	05 20 02.419	-76 37 14.20	–	V	C57
2021-02-01 16:44:07	S	05 19 59.155	-76 37 29.96	–	V	C57
2021-02-01 16:54:07	S	05 19 55.978	-76 37 46.56	–	V	C57
2021-02-01 17:04:07	S	05 19 52.980	-76 38 02.15	–	V	C57
2021-02-01 17:14:07	S	05 19 49.464	-76 38 16.69	–	V	C57
2021-02-01 17:24:07	S	05 19 46.202	-76 38 32.42	–	V	C57
2021-02-01 17:34:07	S	05 19 42.984	-76 38 48.34	–	V	C57
2021-02-01 17:44:07	S	05 19 39.926	-76 39 04.14	–	V	C57
2021-02-01 17:54:07	S	05 19 36.622	-76 39 19.19	–	V	C57
2021-02-01 18:04:07	S	05 19 33.468	-76 39 35.03	–	V	C57
2021-02-01 18:14:07	S	05 19 30.257	-76 39 50.11	–	V	C57
2021-02-01 18:24:07	S	05 19 27.070	-76 40 07.14	–	V	C57
2021-02-01 18:34:07	S	05 19 24.228	-76 40 21.54	–	V	C57
2021-02-01 18:44:07	S	05 19 20.448	-76 40 36.37	–	V	C57
2021-02-01 18:54:07	S	05 19 17.340	-76 40 53.08	–	V	C57
2021-02-01 19:04:07	S	05 19 14.112	-76 41 07.73	–	V	C57
2021-02-01 19:14:07	S	05 19 11.177	-76 41 24.68	–	V	C57
2021-02-01 19:24:07	S	05 19 07.788	-76 41 39.84	–	V	C57
2021-02-01 19:34:07	S	05 19 04.519	-76 41 55.97	–	V	C57
2021-02-01 19:44:07	S	05 19 00.989	-76 42 11.81	–	V	C57
2021-02-01 19:54:07	S	05 18 58.164	-76 42 27.14	–	V	C57
2021-02-01 20:04:07	S	05 18 54.924	-76 42 42.55	–	V	C57

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12538 (1998 OH)