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
2021-01-04 22:04:08	S	06 47 08.246	-56 16 34.07	–	V	C57
2021-01-04 22:04:08	s	1 +58606.308	0 +371573.88	7670.0	–	C57
2021-01-04 22:14:08	S	06 47 07.507	-56 16 57.50	–	V	C57
2021-01-04 22:14:08	s	1 +58277.838	0 +371814.61	4350.0	–	C57
2021-01-04 22:24:08	S	06 47 06.941	-56 17 20.18	–	V	C57
2021-01-04 22:24:08	s	1 +57949.214	0 +372054.34	840.0	–	C57
2021-01-04 22:34:08	S	06 47 06.302	-56 17 42.97	–	V	C57
2021-01-04 22:34:08	s	1 +57620.439	0 +372293.07	7120.0	–	C57
2021-01-04 22:44:08	S	06 47 05.443	-56 18 06.55	–	V	C57
2021-01-04 22:44:08	s	1 +57291.513	0 +372530.81	3200.0	–	C57
2021-01-04 22:54:08	S	06 47 04.776	-56 18 28.94	–	V	C57
2021-01-04 22:54:08	s	1 +56962.437	0 +372767.55	9080.0	–	C57
2021-01-04 23:04:08	S	06 47 04.102	-56 18 51.91	–	V	C57
2021-01-04 23:04:08	s	1 +56633.213	0 +373003.30	4770.0	–	C57
2021-01-04 23:14:08	S	06 47 03.367	-56 19 13.01	–	V	C57
2021-01-04 23:14:08	s	1 +56303.841	0 +373238.05	260.0	–	C57
2021-01-04 23:24:08	S	06 47 02.657	-56 19 36.59	–	V	C57
2021-01-04 23:24:08	s	1 +55974.323	0 +373471.81	5560.0	–	C57
2021-01-04 23:34:08	S	06 47 02.033	-56 19 58.98	–	V	C57
2021-01-04 23:34:08	s	1 +55644.659	0 +373704.58	660.0	–	C57
2021-01-04 23:44:08	S	06 47 01.250	-56 20 22.42	–	V	C57
2021-01-04 23:44:08	s	1 +55314.852	0 +373936.36	5580.0	–	C57
2021-01-04 23:54:08	S	06 47 00.576	-56 20 44.56	–	V	C57
2021-01-04 23:54:08	s	1 +54984.901	0 +374167.15	310.0	–	C57
2021-01-05 00:04:08	S	06 46 59.923	-56 21 06.08	–	V	C57
2021-01-05 00:04:08	s	1 +54654.809	0 +374396.95	4850.0	–	C57
2021-01-05 00:14:08	S	06 46 59.059	-56 21 29.99	–	V	C57
2021-01-05 00:14:08	s	1 +54324.576	0 +374625.76	9200.0	–	C57
2021-01-05 00:24:08	S	06 46 58.447	-56 21 52.31	–	V	C57
2021-01-05 00:24:08	s	1 +53994.203	0 +374853.58	3370.0	–	C57
2021-01-05 00:34:08	S	06 46 57.787	-56 22 15.49	–	V	C57
2021-01-05 00:34:08	s	1 +53663.691	0 +375080.42	7360.0	–	C57
2021-01-05 00:44:08	S	06 46 56.974	-56 22 37.63	–	V	C57
2021-01-05 00:44:08	s	1 +53333.042	0 +375306.27	1160.0	–	C57
2021-01-05 00:54:08	S	06 46 56.191	-56 23 00.06	–	V	C57
2021-01-05 00:54:08	s	1 +53002.256	0 +375531.14	4780.0	–	C57
2021-01-05 01:04:08	S	06 46 55.558	-56 23 23.28	–	V	C57
2021-01-05 01:04:08	s	1 +52671.335	0 +375755.02	8230.0	–	C57
2021-01-05 01:14:08	S	06 46 54.770	-56 23 46.61	–	V	C57
2021-01-05 01:14:08	s	1 +52340.280	0 +375977.92	1500.0	–	C57
2021-01-05 01:24:08	S	06 46 54.091	-56 24 09.04	–	V	C57
2021-01-05 01:24:08	s	1 +52009.091	0 +376199.84	4590.0	–	C57
2021-01-05 01:34:08	S	06 46 53.561	-56 24 30.78	–	V	C57
2021-01-05 01:34:08	s	1 +51677.770	0 +376420.77	7510.0	–	C57
2021-01-05 01:44:08	S	06 46 52.762	-56 24 53.35	–	V	C57
2021-01-05 01:44:08	s	1 +51346.318	0 +376640.72	250.0	–	C57
2021-01-05 01:54:08	S	06 46 51.953	-56 25 16.79	–	V	C57
2021-01-05 01:54:08	s	1 +51014.736	0 +376859.69	2830.0	–	C57
2021-01-05 02:04:08	S	06 46 51.355	-56 25 38.53	–	V	C57
2021-01-05 02:04:08	s	1 +50683.024	0 +377077.69	5230.0	–	C57

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12538 (1998 OH)