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
2021-01-07 11:14:08	s	1 -64706.033	0 +397766.17	2830.0	–	C57
2021-01-07 11:24:08	S	06 42 26.650	-58 30 53.46	–	V	C57
2021-01-07 11:24:08	s	1 -65031.659	0 +397675.55	9660.0	–	C57
2021-01-07 11:34:08	S	06 42 25.834	-58 31 15.17	–	V	C57
2021-01-07 11:34:08	s	1 -65357.139	0 +397584.07	6280.0	–	C57
2021-01-07 11:44:08	S	06 42 25.003	-58 31 36.16	–	V	C57
2021-01-07 11:44:08	s	1 -65682.469	0 +397491.73	2680.0	–	C57
2021-01-07 11:54:08	S	06 42 24.127	-58 31 56.50	–	V	C57
2021-01-07 11:54:08	s	1 -66007.651	0 +397398.53	8860.0	–	C57
2021-01-07 12:04:08	S	06 42 23.273	-58 32 18.78	–	V	C57
2021-01-07 12:04:08	s	1 -66332.682	0 +397304.47	4810.0	–	C57
2021-01-07 12:14:08	S	06 42 22.634	-58 32 39.01	–	V	C57
2021-01-07 12:14:08	s	1 -66657.563	0 +397209.56	550.0	–	C57
2021-01-07 12:24:08	S	06 42 21.557	-58 33 00.32	–	V	C57
2021-01-07 12:24:08	s	1 -66982.292	0 +397113.78	6070.0	–	C57
2021-01-07 12:34:08	S	06 42 20.743	-58 33 21.60	–	V	C57
2021-01-07 12:34:08	s	1 -67306.869	0 +397017.14	1360.0	–	C57
2021-01-07 12:44:08	S	06 42 20.194	-58 33 40.72	–	V	C57
2021-01-07 12:44:08	s	1 -67631.292	0 +396919.65	6430.0	–	C57
2021-01-07 12:54:08	S	06 42 19.126	-58 34 03.65	–	V	C57
2021-01-07 12:54:08	s	1 -67955.562	0 +396821.29	1270.0	–	C57
2021-01-07 13:04:08	S	06 42 18.259	-58 34 23.66	–	V	C57
2021-01-07 13:04:08	s	1 -68279.678	0 +396722.07	5890.0	–	C57
2021-01-07 13:14:08	S	06 42 17.611	-58 34 44.62	–	V	C57
2021-01-07 13:14:08	s	1 -68603.638	0 +396622.00	280.0	–	C57
2021-01-07 13:24:08	S	06 42 16.865	-58 35 05.96	–	V	C57
2021-01-07 13:24:08	s	1 -68927.442	0 +396521.06	4440.0	–	C57
2021-01-07 13:34:08	S	06 42 15.859	-58 35 26.74	–	V	C57
2021-01-07 13:34:08	s	1 -69251.090	0 +396419.27	8370.0	–	C57
2021-01-07 13:44:08	S	06 42 15.216	-58 35 47.87	–	V	C57
2021-01-07 13:44:08	s	1 -69574.579	0 +396316.61	2070.0	–	C57
2021-01-07 13:54:08	S	06 42 14.352	-58 36 09.36	–	V	C57
2021-01-07 13:54:08	s	1 -69897.911	0 +396213.10	5530.0	–	C57
2021-01-07 14:04:08	S	06 42 13.452	-58 36 31.07	–	V	C57
2021-01-07 14:04:08	s	1 -70221.083	0 +396108.72	8770.0	–	C57
2021-01-07 14:14:08	S	06 42 12.758	-58 36 50.69	–	V	C57
2021-01-07 14:14:08	s	1 -70544.096	0 +396003.49	1760.0	–	C57
2021-01-07 14:24:08	S	06 42 11.784	-58 37 12.29	–	V	C57
2021-01-07 14:24:08	s	1 -70866.948	0 +395897.40	4530.0	–	C57
2021-01-07 14:34:08	S	06 42 10.994	-58 37 33.67	–	V	C57
2021-01-07 14:34:08	s	1 -71189.638	0 +395790.44	7050.0	–	C57
2021-01-07 14:44:08	S	06 42 10.130	-58 37 54.08	–	V	C57
2021-01-07 14:44:08	s	1 -71512.167	0 +395682.63	9340.0	–	C57
2021-01-07 14:54:08	S	06 42 09.355	-58 38 14.71	–	V	C57
2021-01-07 14:54:08	s	1 -71834.533	0 +395573.95	1390.0	–	C57
2021-01-07 15:04:08	S	06 42 08.510	-58 38 36.28	–	V	C57
2021-01-07 15:04:08	s	1 -72156.735	0 +395464.42	3200.0	–	C57
2021-01-07 15:14:08	S	06 42 07.726	-58 38 56.72	–	V	C57
2021-01-07 15:14:08	s	1 -72478.772	0 +395354.03	4760.0	–	C57
2021-01-07 15:24:08	S	06 42 06.912	-58 39 18.50	–	V	C57

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12538 (1998 OH)