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
2020-12-23 21:04:08	s	1 -21120.115	0 +403412.85	4060.0	–	C57
2020-12-23 21:14:08	S	06 59 52.870	-44 58 56.82	–	V	C57
2020-12-23 21:14:08	s	1 -21462.821	0 +403429.91	3270.0	–	C57
2020-12-23 21:24:08	S	06 59 52.495	-44 59 21.37	–	V	C57
2020-12-23 21:24:08	s	1 -21805.484	0 +403446.09	2350.0	–	C57
2020-12-23 21:34:08	S	06 59 52.054	-44 59 47.47	–	V	C57
2020-12-23 21:34:08	s	1 -22148.103	0 +403461.40	1330.0	–	C57
2020-12-23 21:44:08	S	06 59 51.612	-45 00 12.85	–	V	C57
2020-12-23 21:44:08	s	1 -22490.676	0 +403475.83	190.0	–	C57
2020-12-23 21:54:08	S	06 59 51.271	-45 00 37.84	–	V	C57
2020-12-23 21:54:08	s	1 -22833.205	0 +403489.38	8930.0	–	C57
2020-12-23 22:04:08	S	06 59 50.784	-45 01 03.86	–	V	C57
2020-12-23 22:04:08	s	1 -23175.686	0 +403502.06	7550.0	–	C57
2020-12-23 22:14:08	S	06 59 50.414	-45 01 29.28	–	V	C57
2020-12-23 22:14:08	s	1 -23518.121	0 +403513.86	6050.0	–	C57
2020-12-23 22:24:08	S	06 59 50.026	-45 01 55.20	–	V	C57
2020-12-23 22:24:08	s	1 -23860.508	0 +403524.79	4440.0	–	C57
2020-12-23 22:34:08	S	06 59 49.596	-45 02 19.32	–	V	C57
2020-12-23 22:34:08	s	1 -24202.846	0 +403534.84	2700.0	–	C57
2020-12-23 22:44:08	S	06 59 49.178	-45 02 44.66	–	V	C57
2020-12-23 22:44:08	s	1 -24545.135	0 +403544.02	840.0	–	C57
2020-12-23 22:54:08	S	06 59 48.710	-45 03 10.66	–	V	C57
2020-12-23 22:54:08	s	1 -24887.374	0 +403552.32	8860.0	–	C57
2020-12-23 23:04:08	S	06 59 48.360	-45 03 36.11	–	V	C57
2020-12-23 23:04:08	s	1 -25229.562	0 +403559.74	6760.0	–	C57
2020-12-23 23:14:08	S	06 59 48.010	-45 04 00.77	–	V	C57
2020-12-23 23:14:08	s	1 -25571.698	0 +403566.30	4530.0	–	C57
2020-12-23 23:24:08	S	06 59 47.508	-45 04 27.01	–	V	C57
2020-12-23 23:24:08	s	1 -25913.782	0 +403571.97	2180.0	–	C57
2020-12-23 23:34:08	S	06 59 47.186	-45 04 51.67	–	V	C57
2020-12-23 23:34:08	s	1 -26255.813	0 +403576.78	9690.0	–	C57
2020-12-23 23:44:08	S	06 59 46.778	-45 05 17.02	–	V	C57
2020-12-23 23:44:08	s	1 -26597.790	0 +403580.71	7080.0	–	C57
2020-12-23 23:54:08	S	06 59 46.363	-45 05 42.36	–	V	C57
2020-12-23 23:54:08	s	1 -26939.712	0 +403583.76	4350.0	–	C57
2020-12-24 00:04:08	S	06 59 45.934	-45 06 07.78	–	V	C57
2020-12-24 00:04:08	s	1 -27281.579	0 +403585.94	1480.0	–	C57
2020-12-24 00:14:08	S	06 59 45.386	-45 06 32.76	–	V	C57
2020-12-24 00:14:08	s	1 -27623.390	0 +403587.25	8480.0	–	C57
2020-12-24 00:24:08	S	06 59 45.199	-45 06 58.46	–	V	C57
2020-12-24 00:24:08	s	1 -27965.144	0 +403587.68	5350.0	–	C57
2020-12-24 00:34:08	S	06 59 44.726	-45 07 24.35	–	V	C57
2020-12-24 00:34:08	s	1 -28306.841	0 +403587.25	2090.0	–	C57
2020-12-24 00:44:08	S	06 59 44.275	-45 07 49.84	–	V	C57
2020-12-24 00:44:08	s	1 -28648.479	0 +403585.93	8690.0	–	C57
2020-12-24 00:54:08	S	06 59 43.829	-45 08 14.57	–	V	C57
2020-12-24 00:54:08	s	1 -28990.058	0 +403583.75	5160.0	–	C57
2020-12-24 01:04:08	S	06 59 43.555	-45 08 39.77	–	V	C57
2020-12-24 01:04:08	s	1 -29331.578	0 +403580.69	1490.0	–	C57
2020-12-24 01:14:08	S	06 59 43.147	-45 09 05.08	–	V	C57

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12538 (1998 OH)