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
2020-12-19 23:54:08	s	1 +148691.81	0 +240639.03	7680.0	–	C57
2020-12-20 00:04:08	S	07 02 55.843	-40 54 51.70	–	V	C57
2020-12-20 00:04:08	s	1 +148506.92	3 +241258.33	480.0	–	C57
2020-12-20 00:14:08	S	07 02 55.615	-40 55 19.24	–	V	C57
2020-12-20 00:14:08	s	1 +148321.09	6 +241876.11	2210.0	–	C57
2020-12-20 00:24:08	S	07 02 55.447	-40 55 45.12	–	V	C57
2020-12-20 00:24:08	s	1 +148134.33	3 +242492.38	2860.0	–	C57
2020-12-20 00:34:08	S	07 02 55.162	-40 56 11.94	–	V	C57
2020-12-20 00:34:08	s	1 +147946.64	1 +243107.14	2430.0	–	C57
2020-12-20 00:44:08	S	07 02 55.075	-40 56 39.66	–	V	C57
2020-12-20 00:44:08	s	1 +147758.02	4 +243720.40	950.0	–	C57
2020-12-20 00:54:08	S	07 02 54.792	-40 57 06.12	–	V	C57
2020-12-20 00:54:08	s	1 +147568.48	8 +244332.16	8410.0	–	C57
2020-12-20 01:04:08	S	07 02 54.466	-40 57 32.94	–	V	C57
2020-12-20 01:04:08	s	1 +147378.03	7 +244942.42	4820.0	–	C57
2020-12-20 01:14:08	S	07 02 54.300	-40 57 59.90	–	V	C57
2020-12-20 01:14:08	s	1 +147186.67	8 +245551.18	180.0	–	C57
2020-12-20 01:24:08	S	07 02 54.108	-40 58 27.01	–	V	C57
2020-12-20 01:24:08	s	1 +146994.41	5 +246158.45	4510.0	–	C57
2020-12-20 01:34:08	S	07 02 53.938	-40 58 53.33	–	V	C57
2020-12-20 01:34:08	s	1 +146801.25	4 +246764.22	7800.0	–	C57
2020-12-20 01:44:08	S	07 02 53.825	-40 59 20.15	–	V	C57
2020-12-20 01:44:08	s	1 +146607.19	9 +247368.52	70.0	–	C57
2020-12-20 01:54:08	S	07 02 53.311	-40 59 47.40	–	V	C57
2020-12-20 01:54:08	s	1 +146412.25	5 +247971.32	1310.0	–	C57
2020-12-20 02:04:08	S	07 02 53.018	-41 00 15.30	–	V	C57
2020-12-20 02:04:08	s	1 +146216.42	7 +248572.65	1550.0	–	C57
2020-12-20 02:14:08	S	07 02 52.831	-41 00 42.34	–	V	C57
2020-12-20 02:14:08	s	1 +146019.72	1 +249172.49	770.0	–	C57
2020-12-20 02:24:08	S	07 02 52.740	-41 01 07.90	–	V	C57
2020-12-20 02:24:08	s	1 +145822.14	1 +249770.86	9000.0	–	C57
2020-12-20 02:34:08	S	07 02 52.435	-41 01 35.62	–	V	C57
2020-12-20 02:34:08	s	1 +145623.69	2 +250367.76	6220.0	–	C57
2020-12-20 02:44:08	S	07 02 52.241	-41 02 03.59	–	V	C57
2020-12-20 02:44:08	s	1 +145424.37	9 +250963.19	2460.0	–	C57
2020-12-20 02:54:08	S	07 02 51.852	-41 02 29.80	–	V	C57
2020-12-20 02:54:08	s	1 +145224.20	7 +251557.14	7710.0	–	C57
2020-12-20 03:04:08	S	07 02 51.622	-41 02 56.18	–	V	C57
2020-12-20 03:04:08	s	1 +145023.18	0 +252149.64	1990.0	–	C57
2020-12-20 03:24:08	S	07 02 51.281	-41 03 50.76	–	V	C57
2020-12-20 03:24:08	s	1 +144618.58	2 +253330.24	7620.0	–	C57
2020-12-20 03:34:08	S	07 02 51.005	-41 04 17.90	–	V	C57
2020-12-20 03:34:08	s	1 +144415.02	0 +253918.36	8990.0	–	C57
2020-12-20 03:44:08	S	07 02 50.741	-41 04 44.15	–	V	C57
2020-12-20 03:44:08	s	1 +144210.62	2 +254505.02	9410.0	–	C57
2020-12-20 03:54:08	S	07 02 50.474	-41 05 10.28	–	V	C57
2020-12-20 03:54:08	s	1 +144005.39	3 +255090.23	8870.0	–	C57
2020-12-20 04:04:08	S	07 02 50.242	-41 05 37.82	–	V	C57
2020-12-20 04:04:08	s	1 +143799.33	8 +255673.99	7390.0	–	C57
2020-12-20 04:14:08	S	07 02 49.968	-41 06 04.28	–	V	C57

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12538 (1998 OH)