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 06:44:08	s	1 -55860.962	0 +399888.05	610.0	–	C57
2021-01-07 06:54:08	S	06 42 48.679	-58 21 21.67	–	V	C57
2021-01-07 06:54:08	s	1 -56190.298	0 +399820.64	2860.0	–	C57
2021-01-07 07:04:08	S	06 42 47.906	-58 21 43.88	–	V	C57
2021-01-07 07:04:08	s	1 -56519.507	0 +399752.36	4930.0	–	C57
2021-01-07 07:14:08	S	06 42 46.934	-58 22 05.41	–	V	C57
2021-01-07 07:14:08	s	1 -56848.587	0 +399683.23	6820.0	–	C57
2021-01-07 07:24:08	S	06 42 46.217	-58 22 26.87	–	V	C57
2021-01-07 07:24:08	s	1 -57177.538	0 +399613.24	8510.0	–	C57
2021-01-07 07:34:08	S	06 42 45.353	-58 22 47.86	–	V	C57
2021-01-07 07:34:08	s	1 -57506.358	0 +399542.38	20.0	–	C57
2021-01-07 07:44:08	S	06 42 44.573	-58 23 08.52	–	V	C57
2021-01-07 07:44:08	s	1 -57835.048	0 +399470.67	1330.0	–	C57
2021-01-07 07:54:08	S	06 42 43.812	-58 23 29.58	–	V	C57
2021-01-07 07:54:08	s	1 -58163.607	0 +399398.10	2450.0	–	C57
2021-01-07 08:04:08	S	06 42 43.085	-58 23 50.50	–	V	C57
2021-01-07 08:04:08	s	1 -58492.033	0 +399324.67	3380.0	–	C57
2021-01-07 08:14:08	S	06 42 42.118	-58 24 12.06	–	V	C57
2021-01-07 08:14:08	s	1 -58820.327	0 +399250.38	4110.0	–	C57
2021-01-07 08:24:08	S	06 42 41.402	-58 24 33.34	–	V	C57
2021-01-07 08:24:08	s	1 -59148.486	0 +399175.23	4650.0	–	C57
2021-01-07 08:34:08	S	06 42 40.598	-58 24 54.79	–	V	C57
2021-01-07 08:34:08	s	1 -59476.512	0 +399099.22	4990.0	–	C57
2021-01-07 08:44:08	S	06 42 39.650	-58 25 15.24	–	V	C57
2021-01-07 08:44:08	s	1 -59804.402	0 +399022.35	5140.0	–	C57
2021-01-07 08:54:08	S	06 42 38.894	-58 25 36.48	–	V	C57
2021-01-07 08:54:08	s	1 -60132.156	0 +398944.62	5080.0	–	C57
2021-01-07 09:04:08	S	06 42 38.141	-58 25 58.08	–	V	C57
2021-01-07 09:04:08	s	1 -60459.774	0 +398866.03	4830.0	–	C57
2021-01-07 09:14:08	S	06 42 37.250	-58 26 19.43	–	V	C57
2021-01-07 09:14:08	s	1 -60787.254	0 +398786.58	4370.0	–	C57
2021-01-07 09:24:08	S	06 42 36.398	-58 26 40.27	–	V	C57
2021-01-07 09:24:08	s	1 -61114.596	0 +398706.27	3710.0	–	C57
2021-01-07 09:34:08	S	06 42 35.714	-58 27 00.68	–	V	C57
2021-01-07 09:34:08	s	1 -61441.799	0 +398625.11	2850.0	–	C57
2021-01-07 09:44:08	S	06 42 34.766	-58 27 22.72	–	V	C57
2021-01-07 09:44:08	s	1 -61768.863	0 +398543.08	1790.0	–	C57
2021-01-07 09:54:08	S	06 42 33.941	-58 27 44.71	–	V	C57
2021-01-07 09:54:08	s	1 -62095.786	0 +398460.19	520.0	–	C57
2021-01-07 10:04:08	S	06 42 33.175	-58 28 05.02	–	V	C57
2021-01-07 10:04:08	s	1 -62422.569	0 +398376.45	9040.0	–	C57
2021-01-07 10:14:08	S	06 42 32.441	-58 28 25.82	–	V	C57
2021-01-07 10:14:08	s	1 -62749.209	0 +398291.85	7360.0	–	C57
2021-01-07 10:24:08	S	06 42 31.548	-58 28 47.68	–	V	C57
2021-01-07 10:24:08	s	1 -63075.707	0 +398206.38	5460.0	–	C57
2021-01-07 10:44:08	S	06 42 29.935	-58 29 29.76	–	V	C57
2021-01-07 10:44:08	s	1 -63728.272	0 +398032.88	1050.0	–	C57
2021-01-07 10:54:08	S	06 42 28.978	-58 29 51.11	–	V	C57
2021-01-07 10:54:08	s	1 -64054.338	0 +397944.83	8520.0	–	C57
2021-01-07 11:14:08	S	06 42 27.492	-58 30 32.11	–	V	C57

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12538 (1998 OH)