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
2021-07-22 20:03:59	S	18 49 12.209	+33 56 41.14	–	V	C57
2021-07-22 20:03:59	s	1 -133165.76	7 -34013.488	4260.0	–	C57
2021-07-22 20:13:59	S	18 49 11.726	+33 56 35.23	–	V	C57
2021-07-22 20:13:59	s	1 -132389.09	7 -34881.604	8910.0	–	C57
2021-07-22 20:23:59	S	18 49 11.153	+33 56 29.90	–	V	C57
2021-07-22 20:23:59	s	1 -131605.91	6 -35747.999	3400.0	–	C57
2021-07-22 20:33:59	S	18 49 10.584	+33 56 25.94	–	V	C57
2021-07-22 20:33:59	s	1 -130816.18	2 -36612.608	7630.0	–	C57
2021-07-22 20:43:59	S	18 49 09.852	+33 56 16.91	–	V	C57
2021-07-22 20:43:59	s	1 -130019.85	4 -37475.366	1460.0	–	C57
2021-07-22 20:53:59	S	18 49 09.494	+33 56 13.92	–	V	C57
2021-07-22 20:53:59	s	1 -129216.89	0 -38336.207	4780.0	–	C57
2021-07-22 21:03:59	S	18 49 08.818	+33 56 06.86	–	V	C57
2021-07-22 21:03:59	s	1 -128407.25	0 -39195.062	7460.0	–	C57
2021-07-22 21:23:59	S	18 49 07.807	+33 55 56.46	–	V	C57
2021-07-22 21:23:59	s	1 -126767.77	4 -40906.533	430.0	–	C57
2021-07-22 21:33:59	S	18 49 07.471	+33 55 50.23	–	V	C57
2021-07-22 21:33:59	s	1 -125937.85	6 -41759.006	480.0	–	C57
2021-07-22 21:43:59	S	18 49 06.641	+33 55 42.89	–	V	C57
2021-07-22 21:43:59	s	1 -125101.09	9 -42609.207	9420.0	–	C57
2021-07-22 21:53:59	S	18 49 06.091	+33 55 37.70	–	V	C57
2021-07-22 21:53:59	s	1 -124257.46	0 -43457.059	7130.0	–	C57
2021-07-22 22:03:59	S	18 49 05.309	+33 55 33.28	–	V	C57
2021-07-22 22:03:59	s	1 -123406.90	1 -44302.486	3480.0	–	C57
2021-07-22 22:13:59	S	18 49 05.126	+33 55 25.64	–	V	C57
2021-07-22 22:13:59	s	1 -122549.38	0 -45145.410	8370.0	–	C57
2021-07-22 22:23:59	S	18 49 04.476	+33 55 22.12	–	V	C57
2021-07-22 22:23:59	s	1 -121684.85	9 -45985.750	1690.0	–	C57
2021-07-22 22:33:59	S	18 49 03.934	+33 55 14.99	–	V	C57
2021-07-22 22:33:59	s	1 -120813.29	8 -46823.425	3300.0	–	C57
2021-07-22 22:43:59	S	18 49 03.326	+33 55 11.53	–	V	C57
2021-07-22 22:43:59	s	1 -119934.65	7 -47658.353	3120.0	–	C57
2021-07-22 22:53:59	S	18 49 02.808	+33 55 03.32	–	V	C57
2021-07-22 22:53:59	s	1 -119048.89	9 -48490.448	1010.0	–	C57
2021-07-22 23:03:59	S	18 49 02.246	+33 54 54.47	–	V	C57
2021-07-22 23:03:59	s	1 -118155.98	5 -49319.625	6880.0	–	C57
2021-07-22 23:13:59	S	18 49 01.572	+33 54 52.52	–	V	C57
2021-07-22 23:13:59	s	1 -117255.87	6 -50145.795	610.0	–	C57
2021-07-22 23:23:59	S	18 49 00.881	+33 54 46.44	–	V	C57
2021-07-22 23:23:59	s	1 -116348.53	7 -50968.868	2100.0	–	C57
2021-07-22 23:33:59	S	18 49 00.334	+33 54 41.69	–	V	C57
2021-07-22 23:33:59	s	1 -115433.92	9 -51788.754	1250.0	–	C57
2021-07-22 23:53:59	S	18 48 59.304	+33 54 28.04	–	V	C57
2021-07-22 23:53:59	s	1 -113582.76	5 -53418.590	2090.0	–	C57
2021-07-23 00:03:59	S	18 48 58.450	+33 54 24.73	–	V	C57
2021-07-23 00:03:59	s	1 -112646.13	8 -54228.348	3590.0	–	C57
2021-07-23 00:13:59	S	18 48 57.938	+33 54 16.81	–	V	C57
2021-07-23 00:13:59	s	1 -111702.10	1 -55034.536	2340.0	–	C57
2021-07-23 03:33:59	S	18 48 46.130	+33 52 25.54	–	V	C57
2021-07-23 03:33:59	s	1 -91220.224	0 -70240.607	9640.0	–	C57

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12538 (1998 OH)