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 19:44:08	s	1 +152991.83	8 +224655.81	5780.0	–	C57
2020-12-19 19:54:08	S	07 03 01.418	-40 43 36.30	–	V	C57
2020-12-19 19:54:08	s	1 +152832.32	4 +225313.94	7900.0	–	C57
2020-12-19 20:04:08	S	07 03 01.368	-40 44 02.90	–	V	C57
2020-12-19 20:04:08	s	1 +152671.72	2 +225970.49	8760.0	–	C57
2020-12-19 20:14:08	S	07 03 01.006	-40 44 31.31	–	V	C57
2020-12-19 20:14:08	s	1 +152510.03	8 +226625.44	8360.0	–	C57
2020-12-19 20:24:08	S	07 03 00.833	-40 44 57.62	–	V	C57
2020-12-19 20:24:08	s	1 +152347.27	9 +227278.81	6720.0	–	C57
2020-12-19 20:34:08	S	07 03 00.617	-40 45 24.23	–	V	C57
2020-12-19 20:34:08	s	1 +152183.45	1 +227930.60	3840.0	–	C57
2020-12-19 20:44:08	S	07 03 00.370	-40 45 51.77	–	V	C57
2020-12-19 20:44:08	s	1 +152018.56	1 +228580.80	9730.0	–	C57
2020-12-19 20:54:08	S	07 03 00.247	-40 46 19.96	–	V	C57
2020-12-19 20:54:08	s	1 +151852.61	4 +229229.44	4390.0	–	C57
2020-12-19 21:04:08	S	07 03 00.022	-40 46 44.80	–	V	C57
2020-12-19 21:04:08	s	1 +151685.61	7 +229876.50	7850.0	–	C57
2020-12-19 21:14:08	S	07 02 59.688	-40 47 12.77	–	V	C57
2020-12-19 21:14:08	s	1 +151517.57	7 +230521.99	90.0	–	C57
2020-12-19 21:24:08	S	07 02 59.510	-40 47 39.84	–	V	C57
2020-12-19 21:24:08	s	1 +151348.49	8 +231165.91	1140.0	–	C57
2020-12-19 21:34:08	S	07 02 59.242	-40 48 06.98	–	V	C57
2020-12-19 21:34:08	s	1 +151178.38	8 +231808.28	990.0	–	C57
2020-12-19 21:44:08	S	07 02 59.035	-40 48 33.08	–	V	C57
2020-12-19 21:44:08	s	1 +151007.25	2 +232449.08	9660.0	–	C57
2020-12-19 21:54:08	S	07 02 58.862	-40 49 00.23	–	V	C57
2020-12-19 21:54:08	s	1 +150835.09	6 +233088.33	7150.0	–	C57
2020-12-19 22:04:08	S	07 02 58.610	-40 49 27.16	–	V	C57
2020-12-19 22:04:08	s	1 +150661.92	7 +233726.02	3460.0	–	C57
2020-12-19 22:14:08	S	07 02 58.452	-40 49 55.09	–	V	C57
2020-12-19 22:14:08	s	1 +150487.74	9 +234362.17	8620.0	–	C57
2020-12-19 22:24:08	S	07 02 58.162	-40 50 21.66	–	V	C57
2020-12-19 22:24:08	s	1 +150312.57	0 +234996.76	2610.0	–	C57
2020-12-19 22:34:08	S	07 02 57.907	-40 50 48.95	–	V	C57
2020-12-19 22:34:08	s	1 +150136.39	5 +235629.82	5460.0	–	C57
2020-12-19 22:44:08	S	07 02 57.797	-40 51 16.16	–	V	C57
2020-12-19 22:44:08	s	1 +149959.22	9 +236261.33	7170.0	–	C57
2020-12-19 22:54:08	S	07 02 57.559	-40 51 42.62	–	V	C57
2020-12-19 22:54:08	s	1 +149781.07	8 +236891.31	7740.0	–	C57
2020-12-19 23:04:08	S	07 02 57.317	-40 52 09.59	–	V	C57
2020-12-19 23:04:08	s	1 +149601.94	8 +237519.74	7180.0	–	C57
2020-12-19 23:14:08	S	07 02 57.010	-40 52 36.05	–	V	C57
2020-12-19 23:14:08	s	1 +149421.84	5 +238146.65	5490.0	–	C57
2020-12-19 23:24:08	S	07 02 56.818	-40 53 03.30	–	V	C57
2020-12-19 23:24:08	s	1 +149240.77	4 +238772.03	2700.0	–	C57
2020-12-19 23:34:08	S	07 02 56.503	-40 53 30.30	–	V	C57
2020-12-19 23:34:08	s	1 +149058.74	1 +239395.89	8790.0	–	C57
2020-12-19 23:44:08	S	07 02 56.462	-40 53 57.44	–	V	C57
2020-12-19 23:44:08	s	1 +148875.75	1 +240018.22	3780.0	–	C57
2020-12-19 23:54:08	S	07 02 56.148	-40 54 24.98	–	V	C57

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12538 (1998 OH)