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 16:54:08	s	1 -12540.569	0 +402700.91	9950.0	–	C57
2020-12-23 17:04:08	S	07 00 03.022	-44 48 20.92	–	V	C57
2020-12-23 17:04:08	s	1 -12884.114	0 +402739.95	1670.0	–	C57
2020-12-23 17:14:08	S	07 00 02.446	-44 48 47.74	–	V	C57
2020-12-23 17:14:08	s	1 -13227.635	0 +402778.11	3310.0	–	C57
2020-12-23 17:24:08	S	07 00 02.107	-44 49 12.54	–	V	C57
2020-12-23 17:24:08	s	1 -13571.131	0 +402815.38	4850.0	–	C57
2020-12-23 17:34:08	S	07 00 01.805	-44 49 37.09	–	V	C57
2020-12-23 17:34:08	s	1 -13914.601	0 +402851.78	6300.0	–	C57
2020-12-23 17:44:08	S	07 00 01.265	-44 50 03.66	–	V	C57
2020-12-23 17:44:08	s	1 -14258.044	0 +402887.29	7660.0	–	C57
2020-12-23 17:54:08	S	07 00 00.955	-44 50 28.39	–	V	C57
2020-12-23 17:54:08	s	1 -14601.459	0 +402921.92	8930.0	–	C57
2020-12-23 18:04:08	S	07 00 00.518	-44 50 54.17	–	V	C57
2020-12-23 18:04:08	s	1 -14944.846	0 +402955.68	110.0	–	C57
2020-12-23 18:14:08	S	07 00 00.187	-44 51 16.20	–	V	C57
2020-12-23 18:14:08	s	1 -15288.204	0 +402988.55	1190.0	–	C57
2020-12-23 18:24:08	S	06 59 59.662	-44 51 45.65	–	V	C57
2020-12-23 18:24:08	s	1 -15631.533	0 +403020.54	2170.0	–	C57
2020-12-23 18:34:08	S	06 59 59.306	-44 52 09.98	–	V	C57
2020-12-23 18:34:08	s	1 -15974.830	0 +403051.65	3060.0	–	C57
2020-12-23 18:44:08	S	06 59 58.843	-44 52 36.12	–	V	C57
2020-12-23 18:44:08	s	1 -16318.097	0 +403081.88	3850.0	–	C57
2020-12-23 18:54:08	S	06 59 58.606	-44 53 01.18	–	V	C57
2020-12-23 18:54:08	s	1 -16661.331	0 +403111.23	4540.0	–	C57
2020-12-23 19:04:08	S	06 59 58.063	-44 53 27.02	–	V	C57
2020-12-23 19:04:08	s	1 -17004.533	0 +403139.71	5130.0	–	C57
2020-12-23 19:14:08	S	06 59 57.648	-44 53 52.94	–	V	C57
2020-12-23 19:14:08	s	1 -17347.700	0 +403167.30	5620.0	–	C57
2020-12-23 19:24:08	S	06 59 57.338	-44 54 17.86	–	V	C57
2020-12-23 19:24:08	s	1 -17690.834	0 +403194.01	6000.0	–	C57
2020-12-23 19:34:08	S	06 59 56.899	-44 54 43.81	–	V	C57
2020-12-23 19:34:08	s	1 -18033.932	0 +403219.85	6290.0	–	C57
2020-12-23 19:44:08	S	06 59 56.335	-44 55 09.05	–	V	C57
2020-12-23 19:44:08	s	1 -18376.995	0 +403244.80	6470.0	–	C57
2020-12-23 19:54:08	S	06 59 55.990	-44 55 33.28	–	V	C57
2020-12-23 19:54:08	s	1 -18720.021	0 +403268.88	6550.0	–	C57
2020-12-23 20:04:08	S	06 59 55.690	-44 55 57.83	–	V	C57
2020-12-23 20:04:08	s	1 -19063.010	0 +403292.08	6520.0	–	C57
2020-12-23 20:14:08	S	06 59 55.303	-44 56 23.96	–	V	C57
2020-12-23 20:14:08	s	1 -19405.960	0 +403314.40	6380.0	–	C57
2020-12-23 20:24:08	S	06 59 54.946	-44 56 49.16	–	V	C57
2020-12-23 20:24:08	s	1 -19748.872	0 +403335.85	6140.0	–	C57
2020-12-23 20:34:08	S	06 59 54.466	-44 57 15.37	–	V	C57
2020-12-23 20:34:08	s	1 -20091.744	0 +403356.42	5780.0	–	C57
2020-12-23 20:44:08	S	06 59 54.024	-44 57 40.21	–	V	C57
2020-12-23 20:44:08	s	1 -20434.576	0 +403376.11	5320.0	–	C57
2020-12-23 20:54:08	S	06 59 53.664	-44 58 06.24	–	V	C57
2020-12-23 20:54:08	s	1 -20777.366	0 +403394.92	4750.0	–	C57
2020-12-23 21:04:08	S	06 59 53.225	-44 58 30.11	–	V	C57

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12538 (1998 OH)