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
2021-01-01 17:04:08	S	06 51 42.559	-53 13 43.43	–	V	C57
2021-01-01 17:04:08	s	1 +159540.16	0 +129352.60	3980.0	–	C57
2021-01-01 17:14:08	S	06 51 42.170	-53 14 07.40	–	V	C57
2021-01-01 17:14:08	s	1 +159583.48	7 +130242.58	5860.0	–	C57
2021-01-01 17:24:08	S	06 51 41.755	-53 14 33.61	–	V	C57
2021-01-01 17:24:08	s	1 +159624.23	8 +131130.46	4080.0	–	C57
2021-01-01 17:34:08	S	06 51 41.254	-53 14 58.13	–	V	C57
2021-01-01 17:34:08	s	1 +159662.43	5 +132016.24	8670.0	–	C57
2021-01-01 17:44:08	S	06 51 40.802	-53 15 22.10	–	V	C57
2021-01-01 17:44:08	s	1 +159698.09	8 +132899.93	9670.0	–	C57
2021-01-01 17:54:08	S	06 51 40.356	-53 15 47.66	–	V	C57
2021-01-01 17:54:08	s	1 +159731.24	9 +133781.51	7110.0	–	C57
2021-01-01 18:04:08	S	06 51 40.006	-53 16 12.86	–	V	C57
2021-01-01 18:04:08	s	1 +159761.90	7 +134661.01	1010.0	–	C57
2021-01-01 18:14:08	S	06 51 39.458	-53 16 37.38	–	V	C57
2021-01-01 18:14:08	s	1 +159790.09	3 +135538.43	1400.0	–	C57
2021-01-01 18:24:08	S	06 51 39.180	-53 17 01.61	–	V	C57
2021-01-01 18:24:08	s	1 +159815.82	7 +136413.76	8310.0	–	C57
2021-01-01 18:34:08	S	06 51 38.630	-53 17 26.20	–	V	C57
2021-01-01 18:34:08	s	1 +159839.12	9 +137287.01	1780.0	–	C57
2021-01-01 18:44:08	S	06 51 38.258	-53 17 50.42	–	V	C57
2021-01-01 18:44:08	s	1 +159860.01	8 +138158.19	1830.0	–	C57
2021-01-01 18:54:08	S	06 51 37.778	-53 18 16.27	–	V	C57
2021-01-01 18:54:08	s	1 +159878.51	4 +139027.30	8480.0	–	C57
2021-01-01 19:04:08	S	06 51 37.286	-53 18 40.68	–	V	C57
2021-01-01 19:04:08	s	1 +159894.63	6 +139894.34	1780.0	–	C57
2021-01-01 19:14:08	S	06 51 36.958	-53 19 05.74	–	V	C57
2021-01-01 19:14:08	s	1 +159908.40	3 +140759.32	1740.0	–	C57
2021-01-01 19:24:08	S	06 51 36.475	-53 19 30.50	–	V	C57
2021-01-01 19:24:08	s	1 +159919.83	4 +141622.24	8390.0	–	C57
2021-01-01 19:34:08	S	06 51 35.976	-53 19 55.31	–	V	C57
2021-01-01 19:34:08	s	1 +159928.94	7 +142483.10	1760.0	–	C57
2021-01-01 19:44:08	S	06 51 35.474	-53 20 19.28	–	V	C57
2021-01-01 19:44:08	s	1 +159935.76	0 +143341.92	1870.0	–	C57
2021-01-01 19:54:08	S	06 51 35.153	-53 20 44.95	–	V	C57
2021-01-01 19:54:08	s	1 +159940.29	3 +144198.69	8760.0	–	C57
2021-01-01 20:04:08	S	06 51 34.711	-53 21 08.42	–	V	C57
2021-01-01 20:04:08	s	1 +159942.56	2 +145053.41	2440.0	–	C57
2021-01-01 20:14:08	S	06 51 34.226	-53 21 34.96	–	V	C57
2021-01-01 20:14:08	s	1 +159942.58	6 +145906.10	2950.0	–	C57
2021-01-01 20:24:08	S	06 51 33.569	-53 21 59.29	–	V	C57
2021-01-01 20:24:08	s	1 +159940.38	2 +146756.76	300.0	–	C57
2021-01-01 20:34:08	S	06 51 33.218	-53 22 25.10	–	V	C57
2021-01-01 20:34:08	s	1 +159935.96	8 +147605.38	4540.0	–	C57
2021-01-01 20:44:08	S	06 51 32.798	-53 22 48.76	–	V	C57
2021-01-01 20:44:08	s	1 +159929.36	0 +148451.98	5670.0	–	C57
2021-01-01 20:54:08	S	06 51 32.309	-53 23 12.23	–	V	C57
2021-01-01 20:54:08	s	1 +159920.57	6 +149296.55	3720.0	–	C57
2021-01-01 21:04:08	S	06 51 31.973	-53 23 38.29	–	V	C57
2021-01-01 21:04:08	s	1 +159909.63	3 +150139.11	8730.0	–	C57

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12538 (1998 OH)