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
2020-12-21 14:34:08	s	1 +88437.107	0 +348641.93	6840.0	–	C57
2020-12-21 14:44:08	S	07 01 51.799	-42 37 55.81	–	V	C57
2020-12-21 14:44:08	s	1 +88126.697	0 +348969.29	9710.0	–	C57
2020-12-21 14:54:08	S	07 01 51.451	-42 38 22.78	–	V	C57
2020-12-21 14:54:08	s	1 +87816.008	0 +349295.57	2280.0	–	C57
2020-12-22 01:52:05	C	07 00 48.12	-42 56 10.8	–	q	834
2020-12-22 03:01:50	C	07 00 45.85	-42 59 09.3	–	q	834
2020-12-22 06:54:08	S	07 01 19.555	-43 20 18.89	–	V	C57
2020-12-22 06:54:08	s	1 +56903.479	0 +375789.98	9070.0	–	C57
2020-12-22 07:04:08	S	07 01 19.195	-43 20 45.64	–	V	C57
2020-12-22 07:04:08	s	1 +56572.158	0 +376017.14	1360.0	–	C57
2020-12-22 07:14:08	S	07 01 18.982	-43 21 11.48	–	V	C57
2020-12-22 07:14:08	s	1 +56240.684	0 +376243.32	3510.0	–	C57
2020-12-22 07:24:08	S	07 01 18.552	-43 21 37.40	–	V	C57
2020-12-22 07:24:08	s	1 +55909.056	0 +376468.52	5520.0	–	C57
2020-12-22 07:34:08	S	07 01 18.307	-43 22 02.96	–	V	C57
2020-12-22 07:34:08	s	1 +55577.276	0 +376692.74	7400.0	–	C57
2020-12-22 07:44:08	S	07 01 17.724	-43 22 29.46	–	V	C57
2020-12-22 07:44:08	s	1 +55245.345	0 +376915.99	9140.0	–	C57
2020-12-22 07:54:08	S	07 01 17.520	-43 22 55.45	–	V	C57
2020-12-22 07:54:08	s	1 +54913.265	0 +377138.26	750.0	–	C57
2020-12-22 08:04:08	S	07 01 17.083	-43 23 21.23	–	V	C57
2020-12-22 08:04:08	s	1 +54581.036	0 +377359.55	2240.0	–	C57
2020-12-22 08:14:08	S	07 01 16.805	-43 23 47.08	–	V	C57
2020-12-22 08:14:08	s	1 +54248.659	0 +377579.87	3590.0	–	C57
2020-12-22 08:24:08	S	07 01 16.380	-43 24 14.94	–	V	C57
2020-12-22 08:24:08	s	1 +53916.136	0 +377799.22	4810.0	–	C57
2020-12-22 08:34:08	S	07 01 15.986	-43 24 39.56	–	V	C57
2020-12-22 08:34:08	s	1 +53583.467	0 +378017.59	5910.0	–	C57
2020-12-22 08:44:08	S	07 01 15.770	-43 25 05.63	–	V	C57
2020-12-22 08:44:08	s	1 +53250.654	0 +378234.99	6880.0	–	C57
2020-12-22 08:54:08	S	07 01 15.425	-43 25 32.45	–	V	C57
2020-12-22 08:54:08	s	1 +52917.697	0 +378451.42	7720.0	–	C57
2020-12-22 09:04:08	S	07 01 14.986	-43 25 57.18	–	V	C57
2020-12-22 09:04:08	s	1 +52584.598	0 +378666.87	8440.0	–	C57
2020-12-22 09:14:08	S	07 01 14.638	-43 26 24.11	–	V	C57
2020-12-22 09:14:08	s	1 +52251.357	0 +378881.36	9040.0	–	C57
2020-12-22 09:24:08	S	07 01 14.256	-43 26 49.52	–	V	C57
2020-12-22 09:24:08	s	1 +51917.977	0 +379094.87	9520.0	–	C57
2020-12-22 09:34:08	S	07 01 14.009	-43 27 16.52	–	V	C57
2020-12-22 09:34:08	s	1 +51584.457	0 +379307.42	9880.0	–	C57
2020-12-22 09:44:08	S	07 01 13.675	-43 27 41.44	–	V	C57
2020-12-22 09:44:08	s	1 +51250.798	0 +379519.00	120.0	–	C57
2020-12-22 09:54:08	S	07 01 13.260	-43 28 07.86	–	V	C57
2020-12-22 09:54:08	s	1 +50917.003	0 +379729.61	250.0	–	C57
2020-12-22 10:04:08	S	07 01 12.830	-43 28 34.54	–	V	C57
2020-12-22 10:04:08	s	1 +50583.071	0 +379939.26	260.0	–	C57
2020-12-22 10:14:08	S	07 01 12.504	-43 29 00.74	–	V	C57
2020-12-22 10:14:08	s	1 +50249.004	0 +380147.94	150.0	–	C57
2020-12-22 10:24:08	S	07 01 12.199	-43 29 26.48	–	V	C57

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12538 (1998 OH)