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
2021-02-02 07:04:07	s	1 -28644.835	0 +389676.07	9770.0	–	C57
2021-02-02 07:44:07	S	05 15 04.306	-77 00 38.09	–	V	C57
2021-02-02 07:44:07	s	1 -30039.893	0 +389737.41	6880.0	–	C57
2021-02-02 07:54:07	S	05 15 00.655	-77 00 54.25	–	V	C57
2021-02-02 07:54:07	s	1 -30388.476	0 +389750.41	5990.0	–	C57
2021-02-02 08:04:07	S	05 14 57.842	-77 01 09.66	–	V	C57
2021-02-02 08:04:07	s	1 -30736.984	0 +389762.47	5030.0	–	C57
2021-02-02 08:14:07	S	05 14 54.214	-77 01 26.33	–	V	C57
2021-02-02 08:14:07	s	1 -31085.418	0 +389773.60	3990.0	–	C57
2021-02-02 08:24:07	S	05 14 50.854	-77 01 40.37	–	V	C57
2021-02-02 08:24:07	s	1 -31433.776	0 +389783.79	2880.0	–	C57
2021-02-02 08:34:07	S	05 14 47.400	-77 01 55.67	–	V	C57
2021-02-02 08:34:07	s	1 -31782.057	0 +389793.05	1690.0	–	C57
2021-02-02 08:44:07	S	05 14 44.074	-77 02 11.62	–	V	C57
2021-02-02 08:44:07	s	1 -32130.260	0 +389801.38	420.0	–	C57
2021-02-02 08:54:07	S	05 14 40.589	-77 02 26.66	–	V	C57
2021-02-02 08:54:07	s	1 -32478.385	0 +389808.77	9080.0	–	C57
2021-02-02 09:04:07	S	05 14 37.128	-77 02 42.11	–	V	C57
2021-02-02 09:04:07	s	1 -32826.431	0 +389815.23	7660.0	–	C57
2021-02-02 09:14:07	S	05 14 33.794	-77 02 56.83	–	V	C57
2021-02-02 09:14:07	s	1 -33174.398	0 +389820.76	6150.0	–	C57
2021-02-02 09:24:07	S	05 14 30.403	-77 03 11.48	–	V	C57
2021-02-02 09:24:07	s	1 -33522.283	0 +389825.35	4560.0	–	C57
2021-02-02 09:34:07	S	05 14 27.082	-77 03 27.32	–	V	C57
2021-02-02 09:34:07	s	1 -33870.087	0 +389829.01	2890.0	–	C57
2021-02-02 09:44:07	S	05 14 23.287	-77 03 41.98	–	V	C57
2021-02-02 09:44:07	s	1 -34217.809	0 +389831.74	1130.0	–	C57
2021-02-02 09:54:07	S	05 14 19.728	-77 03 53.39	–	V	C57
2021-02-02 09:54:07	s	1 -34565.447	0 +389833.54	9280.0	–	C57
2021-02-02 10:04:07	S	05 14 18.305	-77 04 07.10	–	V	C57
2021-02-02 10:04:07	s	1 -34913.001	0 +389834.41	7350.0	–	C57
2021-02-02 10:14:07	S	05 14 12.965	-77 04 30.86	–	V	C57
2021-02-02 10:14:07	s	1 -35260.471	0 +389834.34	5320.0	–	C57
2021-02-02 10:24:07	S	05 14 10.234	-77 04 42.60	–	V	C57
2021-02-02 10:24:07	s	1 -35607.855	0 +389833.35	3210.0	–	C57
2021-02-02 10:34:07	S	05 14 06.629	-77 04 57.47	–	V	C57
2021-02-02 10:34:07	s	1 -35955.152	0 +389831.42	1000.0	–	C57
2021-02-02 10:44:07	S	05 14 03.264	-77 05 13.63	–	V	C57
2021-02-02 10:44:07	s	1 -36302.363	0 +389828.56	8700.0	–	C57
2021-02-02 10:54:07	S	05 14 00.079	-77 05 27.53	–	V	C57
2021-02-02 10:54:07	s	1 -36649.485	0 +389824.77	6300.0	–	C57
2021-02-02 11:04:07	S	05 13 56.453	-77 05 42.90	–	V	C57
2021-02-02 11:04:07	s	1 -36996.518	0 +389820.06	3800.0	–	C57
2021-02-02 11:14:07	S	05 13 52.795	-77 05 57.62	–	V	C57
2021-02-02 11:14:07	s	1 -37343.462	0 +389814.41	1210.0	–	C57
2021-02-02 11:24:07	S	05 13 49.843	-77 06 12.82	–	V	C57
2021-02-02 11:24:07	s	1 -37690.315	0 +389807.83	8510.0	–	C57
2021-02-02 11:34:07	S	05 13 46.469	-77 06 28.26	–	V	C57
2021-02-02 11:34:07	s	1 -38037.078	0 +389800.32	5710.0	–	C57
2021-02-02 11:44:07	S	05 13 43.049	-77 06 42.95	–	V	C57

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12538 (1998 OH)