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
2021-01-20 10:44:08	S	06 13 38.258	-68 30 17.71	–	V	C57
2021-01-20 10:44:08	s	1 -53219.878	0 +392319.48	8420.0	–	C57
2021-01-20 10:54:08	S	06 13 37.296	-68 30 34.78	–	V	C57
2021-01-20 10:54:08	s	1 -53559.365	0 +392277.01	3870.0	–	C57
2021-01-20 11:04:08	S	06 13 35.940	-68 30 53.28	–	V	C57
2021-01-20 11:04:08	s	1 -53898.738	0 +392233.63	9150.0	–	C57
2021-01-20 11:14:08	S	06 13 34.457	-68 31 11.89	–	V	C57
2021-01-20 11:14:08	s	1 -54237.996	0 +392189.34	4240.0	–	C57
2021-01-20 11:24:08	S	06 13 32.921	-68 31 28.34	–	V	C57
2021-01-20 11:24:08	s	1 -54577.138	0 +392144.14	9150.0	–	C57
2021-01-20 11:34:08	S	06 13 31.277	-68 31 46.31	–	V	C57
2021-01-20 11:34:08	s	1 -54916.164	0 +392098.03	3870.0	–	C57
2021-01-20 11:44:08	S	06 13 29.933	-68 32 03.52	–	V	C57
2021-01-20 11:44:08	s	1 -55255.072	0 +392051.02	8410.0	–	C57
2021-01-20 11:54:08	S	06 13 28.601	-68 32 21.80	–	V	C57
2021-01-20 11:54:08	s	1 -55593.863	0 +392003.10	2760.0	–	C57
2021-01-20 12:04:08	S	06 13 27.276	-68 32 40.96	–	V	C57
2021-01-20 12:04:08	s	1 -55932.535	0 +391954.27	6920.0	–	C57
2021-01-20 12:14:08	S	06 13 25.910	-68 32 57.62	–	V	C57
2021-01-20 12:14:08	s	1 -56271.087	0 +391904.54	890.0	–	C57
2021-01-20 12:24:08	S	06 13 24.552	-68 33 11.52	–	V	C57
2021-01-20 12:24:08	s	1 -56609.518	0 +391853.89	4670.0	–	C57
2021-01-20 12:34:08	S	06 13 22.764	-68 33 30.10	–	V	C57
2021-01-20 12:34:08	s	1 -56947.829	0 +391802.34	8250.0	–	C57
2021-01-20 12:44:08	S	06 13 21.302	-68 33 48.78	–	V	C57
2021-01-20 12:44:08	s	1 -57286.017	0 +391749.89	1640.0	–	C57
2021-01-20 12:54:08	S	06 13 19.966	-68 34 06.92	–	V	C57
2021-01-20 12:54:08	s	1 -57624.083	0 +391696.52	4840.0	–	C57
2021-01-20 13:04:08	S	06 13 18.679	-68 34 25.21	–	V	C57
2021-01-20 13:04:08	s	1 -57962.025	0 +391642.25	7830.0	–	C57
2021-01-20 13:14:08	S	06 13 17.280	-68 34 42.71	–	V	C57
2021-01-20 13:14:08	s	1 -58299.843	0 +391587.08	630.0	–	C57
2021-01-20 13:24:08	S	06 13 15.629	-68 35 00.53	–	V	C57
2021-01-20 13:24:08	s	1 -58637.535	0 +391530.99	3230.0	–	C57
2021-01-20 13:34:08	S	06 13 14.174	-68 35 17.12	–	V	C57
2021-01-20 13:34:08	s	1 -58975.101	0 +391474.00	5630.0	–	C57
2021-01-20 13:44:08	S	06 13 12.778	-68 35 34.91	–	V	C57
2021-01-20 13:44:08	s	1 -59312.541	0 +391416.10	7820.0	–	C57
2021-01-20 13:54:08	S	06 13 11.318	-68 35 52.48	–	V	C57
2021-01-20 13:54:08	s	1 -59649.853	0 +391357.30	9810.0	–	C57
2021-01-20 14:04:08	S	06 13 10.097	-68 36 10.80	–	V	C57
2021-01-20 14:04:08	s	1 -59987.036	0 +391297.59	1600.0	–	C57
2021-01-20 14:14:08	S	06 13 08.590	-68 36 28.66	–	V	C57
2021-01-20 14:14:08	s	1 -60324.090	0 +391236.98	3170.0	–	C57
2021-01-20 14:24:08	S	06 13 07.025	-68 36 46.01	–	V	C57
2021-01-20 14:24:08	s	1 -60661.015	0 +391175.45	4540.0	–	C57
2021-01-20 14:34:08	S	06 13 05.573	-68 37 03.14	–	V	C57
2021-01-20 14:34:08	s	1 -60997.808	0 +391113.03	5700.0	–	C57
2021-01-20 14:44:08	S	06 13 04.262	-68 37 20.39	–	V	C57
2021-01-20 14:44:08	s	1 -61334.470	0 +391049.69	6650.0	–	C57

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12538 (1998 OH)