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
2020-12-22 14:34:08	s	1 +41519.138	0 +385236.68	1350.0	–	C57
2020-12-22 14:44:08	S	07 01 02.945	-43 40 41.95	–	V	C57
2020-12-22 14:44:08	s	1 +41181.801	0 +385419.52	8620.0	–	C57
2020-12-22 14:54:08	S	07 01 02.580	-43 41 07.94	–	V	C57
2020-12-22 14:54:08	s	1 +40844.357	0 +385601.42	5820.0	–	C57
2020-12-22 15:04:08	S	07 01 02.215	-43 41 33.32	–	V	C57
2020-12-22 15:04:08	s	1 +40506.806	0 +385782.37	2930.0	–	C57
2020-12-22 15:14:08	S	07 01 01.846	-43 41 59.35	–	V	C57
2020-12-22 15:14:08	s	1 +40169.150	0 +385962.38	9970.0	–	C57
2020-12-22 15:24:08	S	07 01 01.450	-43 42 25.27	–	V	C57
2020-12-22 15:24:08	s	1 +39831.390	0 +386141.44	6930.0	–	C57
2020-12-22 15:34:08	S	07 01 01.219	-43 42 52.88	–	V	C57
2020-12-22 15:34:08	s	1 +39493.526	0 +386319.55	3820.0	–	C57
2020-12-22 15:44:08	S	07 01 00.686	-43 43 15.85	–	V	C57
2020-12-22 15:44:08	s	1 +39155.559	0 +386496.72	630.0	–	C57
2020-12-22 15:54:08	S	07 01 00.355	-43 43 42.56	–	V	C57
2020-12-22 15:54:08	s	1 +38817.491	0 +386672.94	7370.0	–	C57
2020-12-22 16:04:08	S	07 01 00.070	-43 44 09.38	–	V	C57
2020-12-22 16:04:08	s	1 +38479.321	0 +386848.22	4040.0	–	C57
2020-12-22 16:14:08	S	07 00 59.645	-43 44 34.44	–	V	C57
2020-12-22 16:14:08	s	1 +38141.052	0 +387022.56	640.0	–	C57
2020-12-22 16:24:08	S	07 00 59.410	-43 45 01.51	–	V	C57
2020-12-22 16:24:08	s	1 +37802.684	0 +387195.95	7170.0	–	C57
2020-12-22 16:34:08	S	07 00 58.992	-43 45 25.81	–	V	C57
2020-12-22 16:34:08	s	1 +37464.218	0 +387368.41	3630.0	–	C57
2020-12-22 16:44:08	S	07 00 58.625	-43 45 51.98	–	V	C57
2020-12-22 16:44:08	s	1 +37125.655	0 +387539.92	20.0	–	C57
2020-12-22 16:54:08	S	07 00 58.193	-43 46 17.98	–	V	C57
2020-12-22 16:54:08	s	1 +36786.996	0 +387710.49	6350.0	–	C57
2020-12-22 17:04:08	S	07 00 57.934	-43 46 44.40	–	V	C57
2020-12-22 17:04:08	s	1 +36448.242	0 +387880.12	7390.0	–	C57
2020-12-22 17:14:08	S	07 00 57.619	-43 47 10.57	–	V	C57
2020-12-22 17:14:08	s	1 +36109.394	0 +388048.82	1190.0	–	C57
2020-12-22 17:24:08	S	07 00 57.118	-43 47 36.78	–	V	C57
2020-12-22 17:24:08	s	1 +35770.452	0 +388216.57	5050.0	–	C57
2020-12-22 17:34:08	S	07 00 56.796	-43 48 02.41	–	V	C57
2020-12-22 17:34:08	s	1 +35431.418	0 +388383.38	8970.0	–	C57
2020-12-22 17:44:08	S	07 00 56.412	-43 48 27.76	–	V	C57
2020-12-22 17:44:08	s	1 +35092.293	0 +388549.26	2960.0	–	C57
2020-12-22 17:54:08	S	07 00 56.155	-43 48 54.25	–	V	C57
2020-12-22 17:54:08	s	1 +34753.077	0 +388714.20	7000.0	–	C57
2020-12-22 18:04:08	S	07 00 55.656	-43 49 19.81	–	V	C57
2020-12-22 18:04:08	s	1 +34413.771	0 +388878.20	1100.0	–	C57
2020-12-22 18:14:08	S	07 00 55.296	-43 49 45.44	–	V	C57
2020-12-22 18:14:08	s	1 +34074.377	0 +389041.27	5260.0	–	C57
2020-12-22 18:24:08	S	07 00 55.022	-43 50 11.22	–	V	C57
2020-12-22 18:24:08	s	1 +33734.895	0 +389203.40	9470.0	–	C57
2020-12-22 18:34:08	S	07 00 54.720	-43 50 38.76	–	V	C57
2020-12-22 18:34:08	s	1 +33395.326	0 +389364.60	3740.0	–	C57
2020-12-22 18:44:08	S	07 00 54.353	-43 51 03.24	–	V	C57

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12538 (1998 OH)