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
2020-12-18 20:54:08	s	1 +160627.03	0 +117842.29	9350.0	–	C57
2020-12-18 21:04:08	S	07 03 25.344	-39 41 30.05	–	V	C57
2020-12-18 21:04:08	s	1 +160712.36	7 +118753.79	1720.0	–	C57
2020-12-18 21:14:08	S	07 03 25.246	-39 41 57.34	–	V	C57
2020-12-18 21:14:08	s	1 +160794.84	6 +119663.19	640.0	–	C57
2020-12-18 21:24:08	S	07 03 25.030	-39 42 26.46	–	V	C57
2020-12-18 21:24:08	s	1 +160874.49	3 +120570.47	6140.0	–	C57
2020-12-18 21:34:08	S	07 03 24.907	-39 42 53.50	–	V	C57
2020-12-18 21:34:08	s	1 +160951.33	2 +121475.66	8260.0	–	C57
2020-12-18 21:44:08	S	07 03 24.910	-39 43 20.10	–	V	C57
2020-12-18 21:44:08	s	1 +161025.38	5 +122378.75	7030.0	–	C57
2020-12-18 21:54:08	S	07 03 24.737	-39 43 48.65	–	V	C57
2020-12-18 21:54:08	s	1 +161096.67	6 +123279.74	2460.0	–	C57
2020-12-18 22:04:08	S	07 03 24.612	-39 44 15.36	–	V	C57
2020-12-18 22:04:08	s	1 +161165.22	8 +124178.64	4600.0	–	C57
2020-12-18 22:14:08	S	07 03 24.523	-39 44 42.50	–	V	C57
2020-12-18 22:14:08	s	1 +161231.06	4 +125075.45	3460.0	–	C57
2020-12-18 22:24:08	S	07 03 24.288	-39 45 09.18	–	V	C57
2020-12-18 22:24:08	s	1 +161294.20	7 +125970.17	9090.0	–	C57
2020-12-18 22:34:08	S	07 03 24.235	-39 45 36.94	–	V	C57
2020-12-18 22:34:08	s	1 +161354.67	8 +126862.81	1500.0	–	C57
2020-12-18 22:44:08	S	07 03 24.022	-39 46 03.86	–	V	C57
2020-12-18 22:44:08	s	1 +161412.50	1 +127753.37	730.0	–	C57
2020-12-18 22:54:08	S	07 03 23.988	-39 46 31.19	–	V	C57
2020-12-18 22:54:08	s	1 +161467.69	6 +128641.85	6790.0	–	C57
2020-12-18 23:04:08	S	07 03 23.873	-39 46 59.02	–	V	C57
2020-12-18 23:04:08	s	1 +161520.28	4 +129528.26	9730.0	–	C57
2020-12-18 23:14:08	S	07 03 23.741	-39 47 25.08	–	V	C57
2020-12-18 23:14:08	s	1 +161570.28	9 +130412.61	9560.0	–	C57
2020-12-18 23:24:08	S	07 03 23.592	-39 47 52.58	–	V	C57
2020-12-18 23:24:08	s	1 +161617.72	9 +131294.88	6310.0	–	C57
2020-12-18 23:34:08	S	07 03 23.402	-39 48 20.84	–	V	C57
2020-12-18 23:34:08	s	1 +161662.62	7 +132175.10	10.0	–	C57
2020-12-18 23:44:08	S	07 03 23.242	-39 48 47.99	–	V	C57
2020-12-18 23:44:08	s	1 +161705.00	2 +133053.25	680.0	–	C57
2020-12-18 23:54:08	S	07 03 23.131	-39 49 14.92	–	V	C57
2020-12-18 23:54:08	s	1 +161744.87	6 +133929.36	8340.0	–	C57
2020-12-19 00:04:08	S	07 03 22.918	-39 49 42.02	–	V	C57
2020-12-19 00:04:08	s	1 +161782.26	7 +134803.41	3030.0	–	C57
2020-12-19 00:14:08	S	07 03 22.764	-39 50 09.71	–	V	C57
2020-12-19 00:14:08	s	1 +161817.19	7 +135675.41	4770.0	–	C57
2020-12-19 00:24:08	S	07 03 22.661	-39 50 36.53	–	V	C57
2020-12-19 00:24:08	s	1 +161849.68	4 +136545.37	3580.0	–	C57
2020-12-19 00:34:08	S	07 03 22.694	-39 51 03.92	–	V	C57
2020-12-19 00:34:08	s	1 +161879.74	9 +137413.29	9490.0	–	C57
2020-12-19 00:44:08	S	07 03 22.423	-39 51 32.08	–	V	C57
2020-12-19 00:44:08	s	1 +161907.40	9 +138279.18	2520.0	–	C57
2020-12-19 00:54:08	S	07 03 22.296	-39 51 58.72	–	V	C57
2020-12-19 00:54:08	s	1 +161932.68	5 +139143.03	2690.0	–	C57
2020-12-19 01:04:08	S	07 03 22.130	-39 52 25.90	–	V	C57

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12538 (1998 OH)