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 01:04:08	s	1 +161955.59	6 +140004.85	30.0	–	C57
2020-12-19 01:14:08	S	07 03 21.955	-39 52 54.34	–	V	C57
2020-12-19 01:14:08	s	1 +161976.15	9 +140864.65	4560.0	–	C57
2020-12-19 01:24:08	S	07 03 21.869	-39 53 21.19	–	V	C57
2020-12-19 01:24:08	s	1 +161994.39	3 +141722.43	6300.0	–	C57
2020-12-19 01:34:08	S	07 03 21.761	-39 53 48.84	–	V	C57
2020-12-19 01:34:08	s	1 +162010.31	7 +142578.19	5290.0	–	C57
2020-12-19 01:44:08	S	07 03 21.595	-39 54 16.38	–	V	C57
2020-12-19 01:44:08	s	1 +162023.94	8 +143431.94	1530.0	–	C57
2020-12-19 01:54:08	S	07 03 21.415	-39 54 43.42	–	V	C57
2020-12-19 01:54:08	s	1 +162035.30	4 +144283.68	5050.0	–	C57
2020-12-19 02:04:08	S	07 03 21.240	-39 55 09.01	–	V	C57
2020-12-19 02:04:08	s	1 +162044.40	3 +145133.41	5870.0	–	C57
2020-12-19 02:14:08	S	07 03 21.091	-39 55 37.85	–	V	C57
2020-12-19 02:14:08	s	1 +162051.26	2 +145981.15	4020.0	–	C57
2020-12-19 02:24:08	S	07 03 20.933	-39 56 04.99	–	V	C57
2020-12-19 02:24:08	s	1 +162055.89	9 +146826.89	9510.0	–	C57
2020-12-19 02:34:08	S	07 03 20.897	-39 56 30.77	–	V	C57
2020-12-19 02:34:08	s	1 +162058.33	0 +147670.63	2370.0	–	C57
2020-12-19 02:44:08	S	07 03 20.702	-39 56 58.99	–	V	C57
2020-12-19 02:44:08	s	1 +162058.57	3 +148512.39	2620.0	–	C57
2020-12-19 02:54:08	S	07 03 20.534	-39 57 26.60	–	V	C57
2020-12-19 02:54:08	s	1 +162056.64	4 +149352.16	280.0	–	C57
2020-12-19 03:04:08	S	07 03 20.510	-39 57 53.75	–	V	C57
2020-12-19 03:04:08	s	1 +162052.56	0 +150189.94	5370.0	–	C57
2020-12-19 03:14:08	S	07 03 20.184	-39 58 20.46	–	V	C57
2020-12-19 03:14:08	s	1 +162046.33	6 +151025.76	7910.0	–	C57
2020-12-19 03:24:08	S	07 03 19.968	-39 58 48.68	–	V	C57
2020-12-19 03:24:08	s	1 +162037.99	0 +151859.60	7910.0	–	C57
2020-12-19 03:34:08	S	07 03 19.891	-39 59 15.79	–	V	C57
2020-12-19 03:34:08	s	1 +162027.53	7 +152691.47	5410.0	–	C57
2020-12-19 03:44:08	S	07 03 19.745	-39 59 42.61	–	V	C57
2020-12-19 03:44:08	s	1 +162014.99	3 +153521.37	420.0	–	C57
2020-12-19 03:54:08	S	07 03 19.630	-40 00 10.08	–	V	C57
2020-12-19 03:54:08	s	1 +162000.37	4 +154349.32	2950.0	–	C57
2020-12-19 04:04:08	S	07 03 19.430	-40 00 37.55	–	V	C57
2020-12-19 04:04:08	s	1 +161983.69	5 +155175.31	3030.0	–	C57
2020-12-19 04:14:08	S	07 03 19.394	-40 01 04.94	–	V	C57
2020-12-19 04:14:08	s	1 +161964.97	2 +155999.35	680.0	–	C57
2020-12-19 04:24:08	S	07 03 19.082	-40 01 32.30	–	V	C57
2020-12-19 04:24:08	s	1 +161944.21	9 +156821.43	5920.0	–	C57
2020-12-19 04:34:08	S	07 03 18.886	-40 01 59.74	–	V	C57
2020-12-19 04:34:08	s	1 +161921.45	3 +157641.58	8760.0	–	C57
2020-12-19 04:44:08	S	07 03 18.780	-40 02 26.30	–	V	C57
2020-12-19 04:44:08	s	1 +161896.68	7 +158459.78	9220.0	–	C57
2020-12-19 04:54:08	S	07 03 18.677	-40 02 53.95	–	V	C57
2020-12-19 04:54:08	s	1 +161869.93	6 +159276.05	7320.0	–	C57
2020-12-19 05:04:08	S	07 03 18.682	-40 03 20.52	–	V	C57
2020-12-19 05:04:08	s	1 +161841.21	6 +160090.38	3080.0	–	C57
2020-12-19 05:14:08	S	07 03 18.372	-40 03 47.45	–	V	C57

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12538 (1998 OH)