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
2020-12-20 21:04:08	s	1 +119147.60	1 +308052.37	360.0	–	C57
2020-12-20 21:14:08	S	07 02 23.347	-41 51 35.21	–	V	C57
2020-12-20 21:14:08	s	1 +118876.19	8 +308499.54	5250.0	–	C57
2020-12-20 21:24:08	S	07 02 22.910	-41 52 02.35	–	V	C57
2020-12-20 21:24:08	s	1 +118604.31	7 +308945.49	9610.0	–	C57
2020-12-20 21:34:08	S	07 02 22.680	-41 52 29.14	–	V	C57
2020-12-20 21:34:08	s	1 +118331.95	9 +309390.21	3450.0	–	C57
2020-12-20 21:44:08	S	07 02 22.423	-41 52 55.92	–	V	C57
2020-12-20 21:44:08	s	1 +118059.12	7 +309833.72	6760.0	–	C57
2020-12-20 21:54:08	S	07 02 22.277	-41 53 21.19	–	V	C57
2020-12-20 21:54:08	s	1 +117785.82	3 +310276.02	9550.0	–	C57
2020-12-20 22:04:08	S	07 02 21.996	-41 53 47.83	–	V	C57
2020-12-20 22:04:08	s	1 +117512.05	0 +310717.10	1830.0	–	C57
2020-12-20 22:14:08	S	07 02 21.773	-41 54 07.99	–	V	C57
2020-12-20 22:14:08	s	1 +117237.81	0 +311156.97	3590.0	–	C57
2020-12-20 22:24:08	S	07 02 20.666	-41 54 50.22	–	V	C57
2020-12-20 22:24:08	s	1 +116963.10	5 +311595.63	4840.0	–	C57
2020-12-20 23:14:08	S	07 02 19.831	-41 56 54.96	–	V	C57
2020-12-20 23:14:08	s	1 +115582.69	6 +313770.83	3510.0	–	C57
2020-12-20 23:24:08	S	07 02 19.586	-41 57 21.74	–	V	C57
2020-12-20 23:24:08	s	1 +115305.25	3 +314202.27	1750.0	–	C57
2020-12-20 23:34:08	S	07 02 19.418	-41 57 48.06	–	V	C57
2020-12-20 23:34:08	s	1 +115027.36	1 +314632.51	9490.0	–	C57
2020-12-20 23:44:08	S	07 02 19.075	-41 58 14.81	–	V	C57
2020-12-20 23:44:08	s	1 +114749.02	4 +315061.54	6750.0	–	C57
2020-12-20 23:54:08	S	07 02 18.698	-41 58 40.55	–	V	C57
2020-12-20 23:54:08	s	1 +114470.24	3 +315489.39	3520.0	–	C57
2020-12-21 00:04:08	S	07 02 18.415	-41 59 07.04	–	V	C57
2020-12-21 00:04:08	s	1 +114191.02	0 +315916.04	9800.0	–	C57
2020-12-21 00:14:08	S	07 02 18.163	-41 59 34.51	–	V	C57
2020-12-21 00:14:08	s	1 +113911.35	8 +316341.50	5610.0	–	C57
2020-12-21 00:24:08	S	07 02 17.950	-42 00 00.25	–	V	C57
2020-12-21 00:24:08	s	1 +113631.25	9 +316765.77	930.0	–	C57
2020-12-21 00:34:08	S	07 02 17.626	-42 00 27.54	–	V	C57
2020-12-21 00:34:08	s	1 +113350.72	5 +317188.85	5780.0	–	C57
2020-12-21 00:44:08	S	07 02 17.302	-42 00 53.78	–	V	C57
2020-12-21 00:44:08	s	1 +113069.75	8 +317610.75	160.0	–	C57
2020-12-21 00:54:08	S	07 02 17.006	-42 01 20.50	–	V	C57
2020-12-21 00:54:08	s	1 +112788.36	1 +318031.45	4060.0	–	C57
2020-12-21 01:04:08	S	07 02 16.826	-42 01 47.57	–	V	C57
2020-12-21 01:04:08	s	1 +112506.53	5 +318450.98	7500.0	–	C57
2020-12-21 01:14:08	S	07 02 16.462	-42 02 10.64	–	V	C57
2020-12-21 01:14:08	s	1 +112224.28	3 +318869.32	470.0	–	C57
2020-12-21 01:24:08	S	07 02 16.097	-42 02 40.24	–	V	C57
2020-12-21 01:24:08	s	1 +111941.60	8 +319286.49	2970.0	–	C57
2020-12-21 01:34:08	S	07 02 15.792	-42 03 09.25	–	V	C57
2020-12-21 01:34:08	s	1 +111658.51	0 +319702.47	5020.0	–	C57
2020-12-21 01:44:08	S	07 02 15.514	-42 03 33.52	–	V	C57
2020-12-21 01:44:08	s	1 +111374.99	3 +320117.28	6610.0	–	C57
2020-12-21 01:54:08	S	07 02 15.276	-42 04 00.26	–	V	C57

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12538 (1998 OH)