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 08:04:07	s	1 +19803.756	0 +378219.79	460.0	–	C57
2021-02-01 08:14:07	S	05 22 39.122	-76 24 05.36	–	V	C57
2021-02-01 08:14:07	s	1 +19453.268	0 +378369.61	6250.0	–	C57
2021-02-01 08:24:07	S	05 22 36.098	-76 24 20.30	–	V	C57
2021-02-01 08:24:07	s	1 +19102.729	0 +378518.42	1890.0	–	C57
2021-02-01 08:34:07	S	05 22 33.161	-76 24 37.01	–	V	C57
2021-02-01 08:34:07	s	1 +18752.141	0 +378666.23	7380.0	–	C57
2021-02-01 08:44:07	S	05 22 29.928	-76 24 52.13	–	V	C57
2021-02-01 08:44:07	s	1 +18401.505	0 +378813.04	2740.0	–	C57
2021-02-01 08:54:07	S	05 22 26.815	-76 25 07.32	–	V	C57
2021-02-01 08:54:07	s	1 +18050.821	0 +378958.86	7950.0	–	C57
2021-02-01 09:04:07	S	05 22 23.606	-76 25 23.95	–	V	C57
2021-02-01 09:04:07	s	1 +17700.090	0 +379103.68	3020.0	–	C57
2021-02-01 09:14:07	S	05 22 20.830	-76 25 39.50	–	V	C57
2021-02-01 09:14:07	s	1 +17349.314	0 +379247.49	7960.0	–	C57
2021-02-01 09:24:07	S	05 22 17.489	-76 25 56.39	–	V	C57
2021-02-01 09:24:07	s	1 +16998.494	0 +379390.32	2760.0	–	C57
2021-02-01 09:34:07	S	05 22 14.551	-76 26 12.12	–	V	C57
2021-02-01 09:34:07	s	1 +16647.629	0 +379532.14	7430.0	–	C57
2021-02-01 09:44:07	S	05 22 10.990	-76 26 26.63	–	V	C57
2021-02-01 09:44:07	s	1 +16296.723	0 +379672.98	1960.0	–	C57
2021-02-01 09:54:07	S	05 22 08.098	-76 26 43.01	–	V	C57
2021-02-01 09:54:07	s	1 +15945.774	0 +379812.81	6360.0	–	C57
2021-02-01 10:04:07	S	05 22 05.302	-76 26 59.42	–	V	C57
2021-02-01 10:04:07	s	1 +15594.785	0 +379951.65	640.0	–	C57
2021-02-01 10:14:07	S	05 22 01.944	-76 27 15.34	–	V	C57
2021-02-01 10:14:07	s	1 +15243.755	0 +380089.50	4780.0	–	C57
2021-02-01 10:24:07	S	05 21 58.925	-76 27 30.82	–	V	C57
2021-02-01 10:24:07	s	1 +14892.687	0 +380226.36	8810.0	–	C57
2021-02-01 10:34:07	S	05 21 55.582	-76 27 45.83	–	V	C57
2021-02-01 10:34:07	s	1 +14541.582	0 +380362.22	2700.0	–	C57
2021-02-01 10:44:07	S	05 21 52.632	-76 28 01.70	–	V	C57
2021-02-01 10:44:07	s	1 +14190.439	0 +380497.10	6480.0	–	C57
2021-02-01 10:54:07	S	05 21 49.908	-76 28 17.83	–	V	C57
2021-02-01 10:54:07	s	1 +13839.260	0 +380630.98	130.0	–	C57
2021-02-01 11:04:07	S	05 21 46.241	-76 28 34.39	–	V	C57
2021-02-01 11:04:07	s	1 +13488.047	0 +380763.87	3670.0	–	C57
2021-02-01 11:14:07	S	05 21 43.217	-76 28 49.76	–	V	C57
2021-02-01 11:14:07	s	1 +13136.799	0 +380895.77	7090.0	–	C57
2021-02-01 11:24:07	S	05 21 39.967	-76 29 06.47	–	V	C57
2021-02-01 11:24:07	s	1 +12785.518	0 +381026.68	390.0	–	C57
2021-02-01 11:34:07	S	05 21 36.826	-76 29 22.02	–	V	C57
2021-02-01 11:34:07	s	1 +12434.205	0 +381156.60	3580.0	–	C57
2021-02-01 11:44:07	S	05 21 33.943	-76 29 37.93	–	V	C57
2021-02-01 11:44:07	s	1 +12082.861	0 +381285.54	6660.0	–	C57
2021-02-01 11:54:07	S	05 21 30.713	-76 29 53.66	–	V	C57
2021-02-01 11:54:07	s	1 +11731.487	0 +381413.49	9620.0	–	C57
2021-02-01 12:04:07	S	05 21 27.458	-76 30 09.14	–	V	C57
2021-02-01 12:04:07	s	1 +11380.083	0 +381540.45	2480.0	–	C57
2021-02-01 12:14:07	S	05 21 24.446	-76 30 25.85	–	V	C57

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12538 (1998 OH)