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 10:24:08	s	1 +49914.803	0 +380355.65	9930.0	–	C57
2020-12-22 10:34:08	S	07 01 11.834	-43 29 52.48	–	V	C57
2020-12-22 10:34:08	s	1 +49580.469	0 +380562.40	9600.0	–	C57
2020-12-22 10:44:08	S	07 01 11.354	-43 30 14.98	–	V	C57
2020-12-22 10:44:08	s	1 +49246.003	0 +380768.18	9160.0	–	C57
2020-12-22 10:54:08	S	07 01 11.098	-43 30 43.92	–	V	C57
2020-12-22 10:54:08	s	1 +48911.406	0 +380973.00	8610.0	–	C57
2020-12-22 11:04:08	S	07 01 10.836	-43 31 10.27	–	V	C57
2020-12-22 11:04:08	s	1 +48576.679	0 +381176.86	7950.0	–	C57
2020-12-22 11:14:08	S	07 01 10.502	-43 31 36.37	–	V	C57
2020-12-22 11:14:08	s	1 +48241.823	0 +381379.76	7190.0	–	C57
2020-12-22 11:24:08	S	07 01 10.106	-43 32 01.57	–	V	C57
2020-12-22 11:24:08	s	1 +47906.839	0 +381581.69	6320.0	–	C57
2020-12-22 11:34:08	S	07 01 09.701	-43 32 27.82	–	V	C57
2020-12-22 11:34:08	s	1 +47571.727	0 +381782.67	5340.0	–	C57
2020-12-22 11:44:08	S	07 01 09.413	-43 32 54.24	–	V	C57
2020-12-22 11:44:08	s	1 +47236.490	0 +381982.68	4260.0	–	C57
2020-12-22 11:54:08	S	07 01 09.038	-43 33 20.56	–	V	C57
2020-12-22 11:54:08	s	1 +46901.128	0 +382181.73	3080.0	–	C57
2020-12-22 12:04:08	S	07 01 08.688	-43 33 45.40	–	V	C57
2020-12-22 12:04:08	s	1 +46565.642	0 +382379.83	1800.0	–	C57
2020-12-22 12:14:08	S	07 01 08.352	-43 34 12.94	–	V	C57
2020-12-22 12:14:08	s	1 +46230.032	0 +382576.97	420.0	–	C57
2020-12-22 12:24:08	S	07 01 07.942	-43 34 38.28	–	V	C57
2020-12-22 12:24:08	s	1 +45894.301	0 +382773.15	8940.0	–	C57
2020-12-22 12:34:08	S	07 01 07.627	-43 35 03.44	–	V	C57
2020-12-22 12:34:08	s	1 +45558.449	0 +382968.37	7370.0	–	C57
2020-12-22 12:44:08	S	07 01 07.241	-43 35 30.01	–	V	C57
2020-12-22 12:44:08	s	1 +45222.476	0 +383162.64	5690.0	–	C57
2020-12-22 12:54:08	S	07 01 06.852	-43 35 55.36	–	V	C57
2020-12-22 12:54:08	s	1 +44886.385	0 +383355.95	3930.0	–	C57
2020-12-22 13:04:08	S	07 01 06.442	-43 36 22.36	–	V	C57
2020-12-22 13:04:08	s	1 +44550.175	0 +383548.31	2070.0	–	C57
2020-12-22 13:14:08	S	07 01 06.221	-43 36 47.27	–	V	C57
2020-12-22 13:14:08	s	1 +44213.849	0 +383739.72	120.0	–	C57
2020-12-22 13:24:08	S	07 01 05.902	-43 37 13.84	–	V	C57
2020-12-22 13:24:08	s	1 +43877.406	0 +383930.17	8080.0	–	C57
2020-12-22 13:34:08	S	07 01 05.482	-43 37 40.55	–	V	C57
2020-12-22 13:34:08	s	1 +43540.848	0 +384119.66	5950.0	–	C57
2020-12-22 13:44:08	S	07 01 05.064	-43 38 06.04	–	V	C57
2020-12-22 13:44:08	s	1 +43204.176	0 +384308.21	3730.0	–	C57
2020-12-22 13:54:08	S	07 01 04.757	-43 38 31.74	–	V	C57
2020-12-22 13:54:08	s	1 +42867.391	0 +384495.80	1420.0	–	C57
2020-12-22 14:04:08	S	07 01 04.476	-43 38 57.77	–	V	C57
2020-12-22 14:04:08	s	1 +42530.494	0 +384682.45	9030.0	–	C57
2020-12-22 14:14:08	S	07 01 04.099	-43 39 22.90	–	V	C57
2020-12-22 14:14:08	s	1 +42193.485	0 +384868.14	6550.0	–	C57
2020-12-22 14:24:08	S	07 01 03.576	-43 39 50.26	–	V	C57
2020-12-22 14:24:08	s	1 +41856.366	0 +385052.88	3990.0	–	C57
2020-12-22 14:34:08	S	07 01 03.254	-43 40 14.48	–	V	C57

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12538 (1998 OH)