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
2020-12-19 15:24:08	s	1 +156734.79	7 +206974.65	870.0	–	C57
2020-12-19 15:34:08	S	07 03 06.931	-40 31 53.51	–	V	C57
2020-12-19 15:34:08	s	1 +156606.02	3 +207675.36	8740.0	–	C57
2020-12-19 15:44:08	S	07 03 06.742	-40 32 19.25	–	V	C57
2020-12-19 15:44:08	s	1 +156475.97	3 +208374.38	5130.0	–	C57
2020-12-19 16:04:08	S	07 03 06.336	-40 33 14.00	–	V	C57
2020-12-19 16:04:08	s	1 +156212.07	9 +209767.40	3470.0	–	C57
2020-12-19 16:14:08	S	07 03 06.062	-40 33 41.22	–	V	C57
2020-12-19 16:14:08	s	1 +156078.24	9 +210461.40	5450.0	–	C57
2020-12-19 16:24:08	S	07 03 05.880	-40 34 07.97	–	V	C57
2020-12-19 16:24:08	s	1 +155943.17	5 +211153.74	5970.0	–	C57
2020-12-19 16:34:08	S	07 03 05.678	-40 34 35.36	–	V	C57
2020-12-19 16:34:08	s	1 +155806.86	5 +211844.41	5060.0	–	C57
2020-12-19 16:44:08	S	07 03 05.566	-40 35 02.08	–	V	C57
2020-12-19 16:44:08	s	1 +155669.32	6 +212533.43	2710.0	–	C57
2020-12-19 16:54:08	S	07 03 05.359	-40 35 29.40	–	V	C57
2020-12-19 16:54:08	s	1 +155530.56	5 +213220.78	8940.0	–	C57
2020-12-19 17:04:08	S	07 03 05.174	-40 35 56.00	–	V	C57
2020-12-19 17:04:08	s	1 +155390.59	0 +213906.49	3760.0	–	C57
2020-12-19 17:14:08	S	07 03 04.826	-40 36 24.01	–	V	C57
2020-12-19 17:14:08	s	1 +155249.41	0 +214590.54	7170.0	–	C57
2020-12-19 17:24:08	S	07 03 04.685	-40 36 49.00	–	V	C57
2020-12-19 17:24:08	s	1 +155107.03	0 +215272.95	9190.0	–	C57
2020-12-19 17:34:08	S	07 03 04.406	-40 37 21.18	–	V	C57
2020-12-19 17:34:08	s	1 +154963.45	9 +215953.72	9820.0	–	C57
2020-12-19 17:44:08	S	07 03 04.190	-40 37 43.93	–	V	C57
2020-12-19 17:44:08	s	1 +154818.70	3 +216632.85	9070.0	–	C57
2020-12-19 17:54:08	S	07 03 04.116	-40 38 11.51	–	V	C57
2020-12-19 17:54:08	s	1 +154672.77	1 +217310.34	6960.0	–	C57
2020-12-19 18:04:08	S	07 03 04.003	-40 38 40.06	–	V	C57
2020-12-19 18:04:08	s	1 +154525.66	8 +217986.20	3480.0	–	C57
2020-12-19 18:14:08	S	07 03 03.590	-40 39 05.90	–	V	C57
2020-12-19 18:14:08	s	1 +154377.40	3 +218660.43	8650.0	–	C57
2020-12-19 18:24:08	S	07 03 03.413	-40 39 33.01	–	V	C57
2020-12-19 18:24:08	s	1 +154227.98	2 +219333.04	2480.0	–	C57
2020-12-19 18:34:08	S	07 03 03.156	-40 39 59.47	–	V	C57
2020-12-19 18:34:08	s	1 +154077.41	2 +220004.03	4980.0	–	C57
2020-12-19 18:44:08	S	07 03 03.046	-40 40 27.77	–	V	C57
2020-12-19 18:44:08	s	1 +153925.70	1 +220673.40	6150.0	–	C57
2020-12-19 18:54:08	S	07 03 02.803	-40 40 53.83	–	V	C57
2020-12-19 18:54:08	s	1 +153772.85	5 +221341.15	6000.0	–	C57
2020-12-19 19:04:08	S	07 03 02.554	-40 41 21.01	–	V	C57
2020-12-19 19:04:08	s	1 +153618.88	0 +222007.29	4540.0	–	C57
2020-12-19 19:14:08	S	07 03 02.306	-40 41 48.30	–	V	C57
2020-12-19 19:14:08	s	1 +153463.78	5 +222671.82	1780.0	–	C57
2020-12-19 19:24:08	S	07 03 02.066	-40 42 15.55	–	V	C57
2020-12-19 19:24:08	s	1 +153307.57	5 +223334.75	7730.0	–	C57
2020-12-19 19:34:08	S	07 03 01.896	-40 42 42.44	–	V	C57
2020-12-19 19:34:08	s	1 +153150.25	7 +223996.08	2390.0	–	C57
2020-12-19 19:44:08	S	07 03 01.716	-40 43 11.10	–	V	C57

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12538 (1998 OH)