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
2020-12-18 12:14:08	s	1 +151538.89	3 +67496.727	5810.0	–	C57
2020-12-18 12:24:08	S	07 03 30.358	-39 17 46.61	–	V	C57
2020-12-18 12:24:08	s	1 +151814.78	0 +68519.394	520.0	–	C57
2020-12-18 12:34:08	S	07 03 30.238	-39 18 14.51	–	V	C57
2020-12-18 12:34:08	s	1 +152086.03	5 +69539.967	9530.0	–	C57
2020-12-18 12:44:08	S	07 03 30.206	-39 18 41.83	–	V	C57
2020-12-18 12:44:08	s	1 +152352.70	5 +70558.442	2900.0	–	C57
2020-12-18 12:54:08	S	07 03 30.182	-39 19 08.33	–	V	C57
2020-12-18 12:54:08	s	1 +152614.83	5 +71574.814	680.0	–	C57
2020-12-18 13:04:08	S	07 03 30.118	-39 19 36.37	–	V	C57
2020-12-18 13:04:08	s	1 +152872.47	0 +72589.076	2940.0	–	C57
2020-12-18 13:14:08	S	07 03 29.885	-39 20 03.91	–	V	C57
2020-12-18 13:14:08	s	1 +153125.65	7 +73601.223	9730.0	–	C57
2020-12-18 13:24:08	S	07 03 29.798	-39 20 31.09	–	V	C57
2020-12-18 13:24:08	s	1 +153374.43	9 +74611.252	1110.0	–	C57
2020-12-18 13:34:08	S	07 03 29.762	-39 20 58.70	–	V	C57
2020-12-18 13:34:08	s	1 +153618.85	9 +75619.159	7140.0	–	C57
2020-12-18 13:44:08	S	07 03 29.741	-39 21 26.71	–	V	C57
2020-12-18 13:44:08	s	1 +153858.96	1 +76624.938	7860.0	–	C57
2020-12-18 13:54:08	S	07 03 29.683	-39 21 52.52	–	V	C57
2020-12-18 13:54:08	s	1 +154094.78	7 +77628.587	3350.0	–	C57
2020-12-18 14:04:08	S	07 03 29.546	-39 22 21.61	–	V	C57
2020-12-18 14:04:08	s	1 +154326.37	8 +78630.101	3640.0	–	C57
2020-12-18 14:14:08	S	07 03 29.544	-39 22 48.04	–	V	C57
2020-12-18 14:14:08	s	1 +154553.77	8 +79629.479	8790.0	–	C57
2020-12-18 14:24:08	S	07 03 29.501	-39 23 15.04	–	V	C57
2020-12-18 14:24:08	s	1 +154777.02	5 +80626.716	8850.0	–	C57
2020-12-18 14:34:08	S	07 03 29.438	-39 23 43.12	–	V	C57
2020-12-18 14:34:08	s	1 +154996.16	1 +81621.811	3880.0	–	C57
2020-12-18 14:44:08	S	07 03 29.268	-39 24 10.01	–	V	C57
2020-12-18 14:44:08	s	1 +155211.22	6 +82614.762	3930.0	–	C57
2020-12-18 14:54:08	S	07 03 29.222	-39 24 36.90	–	V	C57
2020-12-18 14:54:08	s	1 +155422.25	8 +83605.565	9040.0	–	C57
2020-12-18 15:04:08	S	07 03 29.124	-39 25 05.38	–	V	C57
2020-12-18 15:04:08	s	1 +155629.29	6 +84594.219	9260.0	–	C57
2020-12-18 15:14:08	S	07 03 28.939	-39 25 32.92	–	V	C57
2020-12-18 15:14:08	s	1 +155832.37	8 +85580.723	4650.0	–	C57
2020-12-18 15:24:08	S	07 03 28.855	-39 26 00.02	–	V	C57
2020-12-18 15:24:08	s	1 +156031.54	3 +86565.075	5260.0	–	C57
2020-12-18 15:34:08	S	07 03 28.877	-39 26 27.78	–	V	C57
2020-12-18 15:34:08	s	1 +156226.82	7 +87547.274	1120.0	–	C57
2020-12-18 15:44:08	S	07 03 28.776	-39 26 54.74	–	V	C57
2020-12-18 15:44:08	s	1 +156418.26	8 +88527.319	2290.0	–	C57
2020-12-18 15:54:08	S	07 03 28.711	-39 27 21.56	–	V	C57
2020-12-18 15:54:08	s	1 +156605.90	1 +89505.209	8800.0	–	C57
2020-12-18 16:04:08	S	07 03 28.572	-39 27 48.64	–	V	C57
2020-12-18 16:04:08	s	1 +156789.76	3 +90480.943	720.0	–	C57
2020-12-18 16:14:08	S	07 03 28.572	-39 28 16.10	–	V	C57
2020-12-18 16:14:08	s	1 +156969.88	8 +91454.521	8080.0	–	C57
2020-12-18 16:24:08	S	07 03 28.315	-39 28 49.66	–	V	C57

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12538 (1998 OH)