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
2020-12-21 10:14:08	s	1 +96406.151	0 +339746.38	6610.0	–	C57
2020-12-21 10:24:08	S	07 01 59.878	-42 26 30.88	–	V	C57
2020-12-21 10:24:08	s	1 +96103.521	0 +340101.99	7630.0	–	C57
2020-12-21 10:34:08	S	07 01 59.602	-42 26 57.12	–	V	C57
2020-12-21 10:34:08	s	1 +95800.571	0 +340456.50	8310.0	–	C57
2020-12-21 10:44:08	S	07 01 59.429	-42 27 24.55	–	V	C57
2020-12-21 10:44:08	s	1 +95497.303	0 +340809.91	8650.0	–	C57
2020-12-21 10:54:08	S	07 01 59.146	-42 27 49.54	–	V	C57
2020-12-21 10:54:08	s	1 +95193.720	0 +341162.21	8660.0	–	C57
2020-12-21 11:04:08	S	07 01 58.894	-42 28 17.58	–	V	C57
2020-12-21 11:04:08	s	1 +94889.821	0 +341513.42	8330.0	–	C57
2020-12-21 11:14:08	S	07 01 58.325	-42 28 43.10	–	V	C57
2020-12-21 11:14:08	s	1 +94585.610	0 +341863.53	7680.0	–	C57
2020-12-21 11:24:08	S	07 01 57.857	-42 29 08.38	–	V	C57
2020-12-21 11:24:08	s	1 +94281.088	0 +342212.55	6700.0	–	C57
2020-12-21 11:34:08	S	07 01 57.732	-42 29 35.30	–	V	C57
2020-12-21 11:34:08	s	1 +93976.255	0 +342560.47	5390.0	–	C57
2020-12-21 11:44:08	S	07 01 57.576	-42 30 02.41	–	V	C57
2020-12-21 11:44:08	s	1 +93671.115	0 +342907.30	3760.0	–	C57
2020-12-21 11:54:08	S	07 01 57.137	-42 30 28.62	–	V	C57
2020-12-21 11:54:08	s	1 +93365.669	0 +343253.04	1800.0	–	C57
2020-12-21 12:04:08	S	07 01 56.786	-42 30 54.61	–	V	C57
2020-12-21 12:04:08	s	1 +93059.917	0 +343597.68	9520.0	–	C57
2020-12-21 12:14:08	S	07 01 56.498	-42 31 21.40	–	V	C57
2020-12-21 12:14:08	s	1 +92753.863	0 +343941.24	6930.0	–	C57
2020-12-21 12:24:08	S	07 01 56.189	-42 31 47.57	–	V	C57
2020-12-21 12:24:08	s	1 +92447.507	0 +344283.70	4020.0	–	C57
2020-12-21 12:34:08	S	07 01 55.963	-42 32 13.99	–	V	C57
2020-12-21 12:34:08	s	1 +92140.850	0 +344625.08	800.0	–	C57
2020-12-21 12:44:08	S	07 01 55.536	-42 32 40.78	–	V	C57
2020-12-21 12:44:08	s	1 +91833.896	0 +344965.37	7260.0	–	C57
2020-12-21 12:54:08	S	07 01 55.219	-42 33 06.98	–	V	C57
2020-12-21 12:54:08	s	1 +91526.618	0 +345304.69	3370.0	–	C57
2020-12-21 13:14:08	S	07 01 54.626	-42 33 58.93	–	V	C57
2020-12-21 13:14:08	s	1 +90910.188	0 +345984.36	3320.0	–	C57
2020-12-21 13:24:08	S	07 01 54.430	-42 34 25.82	–	V	C57
2020-12-21 13:24:08	s	1 +90602.059	0 +346320.33	8560.0	–	C57
2020-12-21 13:34:08	S	07 01 53.981	-42 34 52.72	–	V	C57
2020-12-21 13:34:08	s	1 +90293.640	0 +346655.22	3490.0	–	C57
2020-12-21 13:44:08	S	07 01 53.690	-42 35 17.92	–	V	C57
2020-12-21 13:44:08	s	1 +89984.931	0 +346989.03	8130.0	–	C57
2020-12-21 13:54:08	S	07 01 53.402	-42 35 44.74	–	V	C57
2020-12-21 13:54:08	s	1 +89675.935	0 +347321.76	2460.0	–	C57
2020-12-21 14:04:08	S	07 01 53.119	-42 36 10.80	–	V	C57
2020-12-21 14:04:08	s	1 +89366.653	0 +347653.41	6500.0	–	C57
2020-12-21 14:14:08	S	07 01 52.699	-42 36 37.37	–	V	C57
2020-12-21 14:14:08	s	1 +89057.087	0 +347983.99	240.0	–	C57
2020-12-21 14:24:08	S	07 01 52.440	-42 37 03.50	–	V	C57
2020-12-21 14:24:08	s	1 +88747.238	0 +348313.50	3690.0	–	C57
2020-12-21 14:34:08	S	07 01 52.032	-42 37 30.65	–	V	C57

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12538 (1998 OH)