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
2021-01-17 21:54:08	s	1 +71496.642	0 +344326.46	7820.0	–	C57
2021-01-17 22:04:08	S	06 21 42.701	-66 38 11.47	–	V	C57
2021-01-17 22:04:08	s	1 +71173.867	0 +344644.27	7630.0	–	C57
2021-01-17 22:14:08	S	06 21 41.738	-66 38 31.45	–	V	C57
2021-01-17 22:14:08	s	1 +70850.847	0 +344960.95	7000.0	–	C57
2021-01-17 22:24:08	S	06 21 40.536	-66 38 50.39	–	V	C57
2021-01-17 22:24:08	s	1 +70527.582	0 +345276.49	5930.0	–	C57
2021-01-17 22:34:08	S	06 21 39.019	-66 39 09.94	–	V	C57
2021-01-17 22:34:08	s	1 +70204.074	0 +345590.90	4420.0	–	C57
2021-01-17 22:44:08	S	06 21 37.870	-66 39 28.98	–	V	C57
2021-01-17 22:44:08	s	1 +69880.324	0 +345904.18	2480.0	–	C57
2021-01-17 22:54:08	S	06 21 36.734	-66 39 48.64	–	V	C57
2021-01-17 22:54:08	s	1 +69556.334	0 +346216.33	110.0	–	C57
2021-01-17 23:04:08	S	06 21 35.146	-66 40 06.78	–	V	C57
2021-01-17 23:04:08	s	1 +69232.105	0 +346527.36	7310.0	–	C57
2021-01-17 23:14:08	S	06 21 34.812	-66 40 27.66	–	V	C57
2021-01-17 23:14:08	s	1 +68907.639	0 +346837.25	4080.0	–	C57
2021-01-17 23:24:08	S	06 21 33.218	-66 40 46.63	–	V	C57
2021-01-17 23:24:08	s	1 +68582.938	0 +347146.03	430.0	–	C57
2021-01-17 23:34:08	S	06 21 31.637	-66 41 04.92	–	V	C57
2021-01-17 23:34:08	s	1 +68258.003	0 +347453.67	6360.0	–	C57
2021-01-17 23:44:08	S	06 21 30.526	-66 41 23.64	–	V	C57
2021-01-17 23:44:08	s	1 +67932.835	0 +347760.20	1860.0	–	C57
2021-01-17 23:54:08	S	06 21 29.539	-66 41 42.90	–	V	C57
2021-01-17 23:54:08	s	1 +67607.435	0 +348065.60	6960.0	–	C57
2021-01-18 00:04:08	S	06 21 28.255	-66 42 03.42	–	V	C57
2021-01-18 00:04:08	s	1 +67281.807	0 +348369.89	1640.0	–	C57
2021-01-18 00:14:08	S	06 21 26.851	-66 42 22.10	–	V	C57
2021-01-18 00:14:08	s	1 +66955.950	0 +348673.06	5900.0	–	C57
2021-01-18 00:24:08	S	06 21 25.435	-66 42 40.68	–	V	C57
2021-01-18 00:24:08	s	1 +66629.866	0 +348975.10	9760.0	–	C57
2021-01-18 00:34:08	S	06 21 24.480	-66 42 59.29	–	V	C57
2021-01-18 00:34:08	s	1 +66303.557	0 +349276.03	3220.0	–	C57
2021-01-18 00:44:08	S	06 21 23.186	-66 43 19.49	–	V	C57
2021-01-18 00:44:08	s	1 +65977.024	0 +349575.85	6270.0	–	C57
2021-01-18 00:54:08	S	06 21 21.893	-66 43 39.36	–	V	C57
2021-01-18 00:54:08	s	1 +65650.270	0 +349874.55	8920.0	–	C57
2021-01-18 01:04:08	S	06 21 20.750	-66 43 58.15	–	V	C57
2021-01-18 01:04:08	s	1 +65323.294	0 +350172.14	1170.0	–	C57
2021-01-18 01:14:08	S	06 21 19.366	-66 44 17.02	–	V	C57
2021-01-18 01:14:08	s	1 +64996.098	0 +350468.62	3020.0	–	C57
2021-01-18 01:24:08	S	06 21 17.978	-66 44 36.74	–	V	C57
2021-01-18 01:24:08	s	1 +64668.685	0 +350763.99	4480.0	–	C57
2021-01-18 01:34:08	S	06 21 16.954	-66 44 56.26	–	V	C57
2021-01-18 01:34:08	s	1 +64341.055	0 +351058.25	5550.0	–	C57
2021-01-18 01:44:08	S	06 21 15.833	-66 45 16.06	–	V	C57
2021-01-18 01:44:08	s	1 +64013.210	0 +351351.40	6230.0	–	C57
2021-01-18 02:14:08	S	06 21 11.803	-66 46 12.65	–	V	C57
2021-01-18 02:14:08	s	1 +63028.399	0 +352224.22	5970.0	–	C57
2021-01-18 02:24:08	S	06 21 10.699	-66 46 32.16	–	V	C57

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12538 (1998 OH)