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
2021-07-21 17:53:59	S	18 50 32.417	+34 12 10.69	–	V	C57
2021-07-21 17:53:59	s	1 -197137.49	4 +101894.58	5520.0	–	C57
2021-07-21 18:04:00	S	18 50 31.646	+34 12 04.43	–	V	C57
2021-07-21 18:04:00	s	1 -196987.28	0 +101095.15	3200.0	–	C57
2021-07-21 18:13:59	S	18 50 31.142	+34 12 01.62	–	V	C57
2021-07-21 18:13:59	s	1 -196834.74	6 +100294.54	3530.0	–	C57
2021-07-21 18:24:00	S	18 50 30.847	+34 11 51.83	–	V	C57
2021-07-21 18:24:00	s	1 -196679.87	9 +99492.762	6460.0	–	C57
2021-07-21 18:33:59	S	18 50 30.326	+34 11 48.80	–	V	C57
2021-07-21 18:33:59	s	1 -196522.66	6 +98689.804	1950.0	–	C57
2021-07-21 18:43:59	S	18 50 30.024	+34 11 41.39	–	V	C57
2021-07-21 18:43:59	s	1 -196363.09	3 +97885.674	9970.0	–	C57
2021-07-21 18:54:00	S	18 50 29.328	+34 11 35.81	–	V	C57
2021-07-21 18:54:00	s	1 -196201.14	6 +97080.373	460.0	–	C57
2021-07-21 19:03:59	S	18 50 28.613	+34 11 31.09	–	V	C57
2021-07-21 19:03:59	s	1 -196036.81	3 +96273.903	3390.0	–	C57
2021-07-21 19:14:00	S	18 50 28.370	+34 11 22.13	–	V	C57
2021-07-21 19:14:00	s	1 -195870.07	8 +95466.267	8710.0	–	C57
2021-07-21 19:23:59	S	18 50 27.977	+34 11 16.12	–	V	C57
2021-07-21 19:23:59	s	1 -195700.92	8 +94657.465	6370.0	–	C57
2021-07-21 19:34:00	S	18 50 27.314	+34 11 14.39	–	V	C57
2021-07-21 19:34:00	s	1 -195529.34	9 +93847.501	6350.0	–	C57
2021-07-21 19:43:59	S	18 50 26.935	+34 11 07.48	–	V	C57
2021-07-21 19:43:59	s	1 -195355.32	7 +93036.377	8580.0	–	C57
2021-07-21 19:54:00	S	18 50 26.417	+34 10 59.38	–	V	C57
2021-07-21 19:54:00	s	1 -195178.84	7 +92224.094	3040.0	–	C57
2021-07-21 20:03:59	S	18 50 25.975	+34 10 53.18	–	V	C57
2021-07-21 20:03:59	s	1 -194999.89	5 +91410.655	9660.0	–	C57
2021-07-21 20:13:59	S	18 50 25.334	+34 10 47.68	–	V	C57
2021-07-21 20:13:59	s	1 -194818.45	7 +90596.064	8410.0	–	C57
2021-07-21 20:24:00	S	18 50 25.123	+34 10 44.54	–	V	C57
2021-07-21 20:24:00	s	1 -194634.51	8 +89780.321	9240.0	–	C57
2021-07-21 20:33:59	S	18 50 24.722	+34 10 34.64	–	V	C57
2021-07-21 20:33:59	s	1 -194448.06	4 +88963.430	2110.0	–	C57
2021-07-21 20:44:00	S	18 50 24.125	+34 10 31.33	–	V	C57
2021-07-21 20:44:00	s	1 -194259.07	8 +88145.393	6960.0	–	C57
2021-07-21 20:53:59	S	18 50 23.566	+34 10 26.40	–	V	C57
2021-07-21 20:53:59	s	1 -194067.54	7 +87326.213	3760.0	–	C57
2021-07-21 21:04:00	S	18 50 23.167	+34 10 15.53	–	V	C57
2021-07-21 21:04:00	s	1 -193873.45	5 +86505.893	2450.0	–	C57
2021-07-21 21:13:59	S	18 50 22.747	+34 10 11.10	–	V	C57
2021-07-21 21:13:59	s	1 -193676.78	8 +85684.435	2990.0	–	C57
2021-07-21 21:24:00	S	18 50 21.998	+34 10 00.91	–	V	C57
2021-07-21 21:24:00	s	1 -193477.52	8 +84861.843	5320.0	–	C57
2021-07-21 21:33:59	S	18 50 21.754	+34 10 00.30	–	V	C57
2021-07-21 21:33:59	s	1 -193275.66	2 +84038.119	9410.0	–	C57
2021-07-21 21:43:59	S	18 50 20.839	+34 09 53.64	–	V	C57
2021-07-21 21:43:59	s	1 -193071.17	4 +83213.267	5200.0	–	C57
2021-07-21 21:54:00	S	18 50 20.575	+34 09 48.46	–	V	C57
2021-07-21 21:54:00	s	1 -192864.04	7 +82387.290	2650.0	–	C57

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12538 (1998 OH)