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
2021-01-01 21:14:08	S	06 51 31.495	-53 24 02.20	–	V	C57
2021-01-01 21:14:08	s	1 +159896.54	7 +150979.65	710.0	–	C57
2021-01-01 21:24:08	S	06 51 31.001	-53 24 26.96	–	V	C57
2021-01-01 21:24:08	s	1 +159881.33	5 +151818.18	9680.0	–	C57
2021-01-01 21:34:08	S	06 51 30.446	-53 24 51.91	–	V	C57
2021-01-01 21:34:08	s	1 +159864.01	3 +152654.71	5680.0	–	C57
2021-01-01 21:44:08	S	06 51 30.084	-53 25 16.00	–	V	C57
2021-01-01 21:44:08	s	1 +159844.59	6 +153489.24	8720.0	–	C57
2021-01-01 21:54:08	S	06 51 29.638	-53 25 41.88	–	V	C57
2021-01-01 21:54:08	s	1 +159823.10	3 +154321.77	8820.0	–	C57
2021-01-01 22:04:08	S	06 51 29.153	-53 26 05.96	–	V	C57
2021-01-01 22:04:08	s	1 +159799.54	7 +155152.30	6020.0	–	C57
2021-01-01 22:14:08	S	06 51 28.716	-53 26 30.59	–	V	C57
2021-01-01 22:14:08	s	1 +159773.94	4 +155980.85	330.0	–	C57
2021-01-01 22:24:08	S	06 51 28.207	-53 26 55.86	–	V	C57
2021-01-01 22:24:08	s	1 +159746.31	1 +156807.42	1770.0	–	C57
2021-01-01 22:34:08	S	06 51 27.727	-53 27 19.51	–	V	C57
2021-01-01 22:34:08	s	1 +159716.66	2 +157632.00	380.0	–	C57
2021-01-01 22:44:08	S	06 51 27.276	-53 27 43.96	–	V	C57
2021-01-01 22:44:08	s	1 +159685.01	3 +158454.61	6160.0	–	C57
2021-01-01 22:54:08	S	06 51 26.851	-53 28 10.02	–	V	C57
2021-01-01 22:54:08	s	1 +159651.37	9 +159275.24	9140.0	–	C57
2021-01-01 23:04:08	S	06 51 26.323	-53 28 33.53	–	V	C57
2021-01-01 23:04:08	s	1 +159615.77	4 +160093.91	9350.0	–	C57
2021-01-01 23:14:08	S	06 51 25.838	-53 28 58.33	–	V	C57
2021-01-01 23:14:08	s	1 +159578.21	3 +160910.61	6800.0	–	C57
2021-01-01 23:24:08	S	06 51 25.522	-53 29 22.92	–	V	C57
2021-01-01 23:24:08	s	1 +159538.71	0 +161725.36	1510.0	–	C57
2021-01-01 23:34:08	S	06 51 24.924	-53 29 49.13	–	V	C57
2021-01-01 23:34:08	s	1 +159497.28	1 +162538.15	3510.0	–	C57
2021-01-01 23:44:08	S	06 51 24.574	-53 30 11.92	–	V	C57
2021-01-01 23:44:08	s	1 +159453.93	9 +163348.98	2820.0	–	C57
2021-01-01 23:54:08	S	06 51 23.971	-53 30 36.61	–	V	C57
2021-01-01 23:54:08	s	1 +159408.69	9 +164157.88	9450.0	–	C57
2021-01-02 00:04:08	S	06 51 23.388	-53 31 01.63	–	V	C57
2021-01-02 00:04:08	s	1 +159361.57	4 +164964.83	3430.0	–	C57
2021-01-02 00:14:08	S	06 51 23.086	-53 31 26.15	–	V	C57
2021-01-02 00:14:08	s	1 +159312.57	8 +165769.84	4780.0	–	C57
2021-01-02 00:24:08	S	06 51 22.625	-53 31 50.59	–	V	C57
2021-01-02 00:24:08	s	1 +159261.72	5 +166572.91	3520.0	–	C57
2021-01-02 00:34:08	S	06 51 22.094	-53 32 16.01	–	V	C57
2021-01-02 00:34:08	s	1 +159209.02	9 +167374.06	9660.0	–	C57
2021-01-02 00:44:08	S	06 51 21.490	-53 32 39.23	–	V	C57
2021-01-02 00:44:08	s	1 +159154.50	3 +168173.28	3230.0	–	C57
2021-01-02 00:54:08	S	06 51 21.000	-53 33 04.36	–	V	C57
2021-01-02 00:54:08	s	1 +159098.16	0 +168970.58	4240.0	–	C57
2021-01-02 01:04:08	S	06 51 20.563	-53 33 30.13	–	V	C57
2021-01-02 01:04:08	s	1 +159040.01	3 +169765.97	2720.0	–	C57
2021-01-02 01:14:08	S	06 51 20.186	-53 33 54.00	–	V	C57
2021-01-02 01:14:08	s	1 +158980.07	6 +170559.44	8680.0	–	C57

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12538 (1998 OH)