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
2018-12-01 19:44:39	s	1 +98307.802	0 +284028.94	2750.0	–	C57
2018-12-01 20:14:39	S	04 07 03.854	-07 31 44.87	–	V	C57
2018-12-01 20:14:39	s	1 +97466.368	0 +285447.60	3450.0	–	C57
2018-12-01 20:44:39	S	04 07 01.226	-07 32 28.93	–	V	C57
2018-12-01 20:44:39	s	1 +96621.022	0 +286854.55	6540.0	–	C57
2018-12-01 21:14:39	S	04 06 58.591	-07 33 14.76	–	V	C57
2018-12-01 21:14:39	s	1 +95771.832	0 +288249.83	2480.0	–	C57
2018-12-01 21:44:39	S	04 06 56.153	-07 33 56.52	–	V	C57
2018-12-01 21:44:39	s	1 +94918.867	0 +289633.50	1750.0	–	C57
2018-12-01 22:14:39	S	04 06 53.352	-07 34 42.53	–	V	C57
2018-12-01 22:14:39	s	1 +94062.196	0 +291005.59	4780.0	–	C57
2018-12-01 22:44:39	S	04 06 50.854	-07 35 25.01	–	V	C57
2018-12-01 22:44:39	s	1 +93201.885	0 +292366.15	2030.0	–	C57
2018-12-01 23:14:39	S	04 06 48.170	-07 36 11.12	–	V	C57
2018-12-01 23:14:39	s	1 +92338.000	0 +293715.22	3920.0	–	C57
2018-12-01 23:44:39	S	04 06 45.590	-07 36 53.96	–	V	C57
2018-12-01 23:44:39	s	1 +91470.605	0 +295052.85	890.0	–	C57
2018-12-02 00:14:39	S	04 06 43.135	-07 37 36.37	–	V	C57
2018-12-02 00:14:39	s	1 +90599.764	0 +296379.09	3370.0	–	C57
2018-12-02 00:44:39	S	04 06 40.390	-07 38 22.20	–	V	C57
2018-12-02 00:44:39	s	1 +89725.541	0 +297693.96	1770.0	–	C57
2018-12-02 01:14:39	S	04 06 37.915	-07 39 03.60	–	V	C57
2018-12-02 01:14:39	s	1 +88847.996	0 +298997.52	6510.0	–	C57
2018-12-02 01:44:39	S	04 06 35.141	-07 39 50.18	–	V	C57
2018-12-02 01:44:39	s	1 +87967.191	0 +300289.81	7990.0	–	C57
2018-12-02 02:44:39	S	04 06 30.053	-07 41 15.72	–	V	C57
2018-12-02 02:44:39	s	1 +86196.040	0 +302840.72	2780.0	–	C57
2018-12-02 03:14:39	S	04 06 27.348	-07 42 00.54	–	V	C57
2018-12-02 03:14:39	s	1 +85305.811	0 +304099.43	6870.0	–	C57
2018-12-02 03:44:39	S	04 06 25.056	-07 42 40.82	–	V	C57
2018-12-02 03:44:39	s	1 +84412.557	0 +305347.03	9290.0	–	C57
2018-12-02 04:14:39	S	04 06 22.483	-07 43 27.37	–	V	C57
2018-12-02 04:14:39	s	1 +83516.333	0 +306583.56	390.0	–	C57
2018-12-02 04:44:39	S	04 06 19.579	-07 44 11.54	–	V	C57
2018-12-02 04:44:39	s	1 +82617.197	0 +307809.06	570.0	–	C57
2018-12-02 05:14:39	S	04 06 17.174	-07 44 53.59	–	V	C57
2018-12-02 05:14:39	s	1 +81715.203	0 +309023.56	190.0	–	C57
2018-12-02 05:44:39	S	04 06 14.412	-07 45 38.84	–	V	C57
2018-12-02 05:44:39	s	1 +80810.405	0 +310227.11	9600.0	–	C57
2018-12-02 06:14:39	S	04 06 11.830	-07 46 21.68	–	V	C57
2018-12-02 06:14:39	s	1 +79902.857	0 +311419.73	9190.0	–	C57
2018-12-02 06:44:39	S	04 06 09.264	-07 47 05.53	–	V	C57
2018-12-02 06:44:39	s	1 +78992.611	0 +312601.48	9280.0	–	C57
2018-12-02 07:14:39	S	04 06 06.614	-07 47 48.55	–	V	C57
2018-12-02 07:14:39	s	1 +78079.720	0 +313772.39	250.0	–	C57
2018-12-02 07:44:39	S	04 06 04.032	-07 48 32.98	–	V	C57
2018-12-02 07:44:39	s	1 +77164.235	0 +314932.49	2430.0	–	C57
2018-12-02 08:14:39	S	04 06 01.457	-07 49 15.96	–	V	C57
2018-12-02 08:14:39	s	1 +76246.207	0 +316081.82	6160.0	–	C57
2018-12-02 08:44:39	S	04 05 58.831	-07 49 59.88	–	V	C57

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12538 (1998 OH)