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 23:24:08	S	06 11 48.655	-68 52 28.34	–	V	C57
2021-01-20 23:24:08	s	1 -78639.365	0 +386509.45	9550.0	–	C57
2021-01-20 23:34:08	S	06 11 47.436	-68 52 47.03	–	V	C57
2021-01-20 23:34:08	s	1 -78967.885	0 +386398.18	7270.0	–	C57
2021-01-20 23:44:08	S	06 11 46.008	-68 53 03.77	–	V	C57
2021-01-20 23:44:08	s	1 -79296.228	0 +386286.00	4690.0	–	C57
2021-01-20 23:54:08	S	06 11 44.434	-68 53 20.83	–	V	C57
2021-01-20 23:54:08	s	1 -79624.395	0 +386172.91	1820.0	–	C57
2021-01-21 00:04:08	S	06 11 42.912	-68 53 38.47	–	V	C57
2021-01-21 00:04:08	s	1 -79952.384	0 +386058.92	8660.0	–	C57
2021-01-21 00:14:08	S	06 11 41.302	-68 53 55.43	–	V	C57
2021-01-21 00:14:08	s	1 -80280.194	0 +385944.03	5210.0	–	C57
2021-01-21 00:24:08	S	06 11 39.804	-68 54 12.31	–	V	C57
2021-01-21 00:24:08	s	1 -80607.825	0 +385828.23	1470.0	–	C57
2021-01-21 00:44:08	S	06 11 37.246	-68 54 47.74	–	V	C57
2021-01-21 00:44:08	s	1 -81262.546	0 +385593.92	3080.0	–	C57
2021-01-21 00:54:08	S	06 11 35.690	-68 55 04.26	–	V	C57
2021-01-21 00:54:08	s	1 -81589.634	0 +385475.40	8440.0	–	C57
2021-01-21 01:04:08	S	06 11 34.178	-68 55 21.79	–	V	C57
2021-01-21 01:04:08	s	1 -81916.539	0 +385355.99	3500.0	–	C57
2021-01-21 01:14:08	S	06 11 32.458	-68 55 39.07	–	V	C57
2021-01-21 01:14:08	s	1 -82243.261	0 +385235.66	8260.0	–	C57
2021-01-21 01:24:08	S	06 11 31.279	-68 55 56.06	–	V	C57
2021-01-21 01:24:08	s	1 -82569.798	0 +385114.44	2710.0	–	C57
2021-01-21 01:34:08	S	06 11 29.815	-68 56 12.91	–	V	C57
2021-01-21 01:34:08	s	1 -82896.149	0 +384992.31	6860.0	–	C57
2021-01-21 01:44:08	S	06 11 28.409	-68 56 31.96	–	V	C57
2021-01-21 01:44:08	s	1 -83222.315	0 +384869.27	710.0	–	C57
2021-01-21 01:54:08	S	06 11 26.849	-68 56 48.73	–	V	C57
2021-01-21 01:54:08	s	1 -83548.293	0 +384745.33	4240.0	–	C57
2021-01-21 02:04:08	S	06 11 25.346	-68 57 05.08	–	V	C57
2021-01-21 02:04:08	s	1 -83874.084	0 +384620.48	7470.0	–	C57
2021-01-21 02:14:08	S	06 11 23.782	-68 57 23.18	–	V	C57
2021-01-21 02:14:08	s	1 -84199.686	0 +384494.73	380.0	–	C57
2021-01-21 02:24:08	S	06 11 22.392	-68 57 39.64	–	V	C57
2021-01-21 02:24:08	s	1 -84525.098	0 +384368.08	2980.0	–	C57
2021-01-21 02:34:08	S	06 11 20.957	-68 57 56.70	–	V	C57
2021-01-21 02:34:08	s	1 -84850.319	0 +384240.52	5270.0	–	C57
2021-01-21 02:44:08	S	06 11 19.531	-68 58 14.59	–	V	C57
2021-01-21 02:44:08	s	1 -85175.350	0 +384112.05	7240.0	–	C57
2021-01-21 02:54:08	S	06 11 18.151	-68 58 32.09	–	V	C57
2021-01-21 02:54:08	s	1 -85500.188	0 +383982.68	8890.0	–	C57
2021-01-21 03:04:08	S	06 11 16.562	-68 58 49.48	–	V	C57
2021-01-21 03:04:08	s	1 -85824.833	0 +383852.41	230.0	–	C57
2021-01-21 03:14:08	S	06 11 14.940	-68 59 06.25	–	V	C57
2021-01-21 03:14:08	s	1 -86149.284	0 +383721.22	1250.0	–	C57
2021-01-21 03:24:08	S	06 11 13.404	-68 59 23.24	–	V	C57
2021-01-21 03:24:08	s	1 -86473.540	0 +383589.14	1940.0	–	C57
2021-01-21 03:34:08	S	06 11 12.041	-68 59 40.49	–	V	C57
2021-01-21 03:34:08	s	1 -86797.600	0 +383456.15	2310.0	–	C57

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12538 (1998 OH)