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
2018-12-05 06:14:39	s	1 -60739.069	0 +382475.66	540.0	–	C57
2018-12-05 06:44:39	S	03 59 59.105	-09 28 14.88	–	V	C57
2018-12-05 06:44:39	s	1 -61688.196	0 +382329.17	820.0	–	C57
2018-12-05 07:14:39	S	03 59 56.554	-09 28 56.28	–	V	C57
2018-12-05 07:14:39	s	1 -62635.847	0 +382174.29	9430.0	–	C57
2018-12-05 07:44:39	S	03 59 53.976	-09 29 34.08	–	V	C57
2018-12-05 07:44:39	s	1 -63581.999	0 +382011.04	6480.0	–	C57
2018-12-05 08:14:39	S	03 59 51.593	-09 30 16.74	–	V	C57
2018-12-05 08:14:39	s	1 -64526.634	0 +381839.40	2110.0	–	C57
2018-12-05 08:44:39	S	03 59 49.085	-09 30 57.74	–	V	C57
2018-12-05 08:44:39	s	1 -65469.728	0 +381659.39	6460.0	–	C57
2018-12-05 09:14:39	S	03 59 46.606	-09 31 38.57	–	V	C57
2018-12-05 09:14:39	s	1 -66411.262	0 +381471.00	9640.0	–	C57
2018-12-05 09:44:39	S	03 59 44.066	-09 32 19.61	–	V	C57
2018-12-05 09:44:39	s	1 -67351.214	0 +381274.24	1790.0	–	C57
2018-12-05 10:14:39	S	03 59 41.486	-09 32 58.74	–	V	C57
2018-12-05 10:14:39	s	1 -68289.563	0 +381069.10	3030.0	–	C57
2018-12-05 11:44:39	S	03 59 33.970	-09 34 59.99	–	V	C57
2018-12-05 11:44:39	s	1 -71094.782	0 +380403.49	2620.0	–	C57
2018-12-05 12:14:39	S	03 59 31.454	-09 35 42.50	–	V	C57
2018-12-05 12:14:39	s	1 -72026.508	0 +380164.88	1540.0	–	C57
2018-12-05 12:44:39	S	03 59 28.956	-09 36 22.93	–	V	C57
2018-12-05 12:44:39	s	1 -72956.525	0 +379917.91	190.0	–	C57
2018-12-05 13:14:39	S	03 59 26.450	-09 37 03.25	–	V	C57
2018-12-05 13:14:39	s	1 -73884.811	0 +379662.57	8720.0	–	C57
2018-12-05 13:44:39	S	03 59 23.947	-09 37 43.61	–	V	C57
2018-12-05 13:44:39	s	1 -74811.346	0 +379398.87	7240.0	–	C57
2018-12-05 19:44:39	S	03 58 53.938	-09 45 49.93	–	V	C57
2018-12-05 19:44:39	s	1 -85785.237	0 +375581.97	3320.0	–	C57
2018-12-05 20:14:39	S	03 58 51.492	-09 46 29.35	–	V	C57
2018-12-05 20:14:39	s	1 -86687.021	0 +375209.50	2980.0	–	C57
2018-12-05 20:44:39	S	03 58 48.840	-09 47 10.93	–	V	C57
2018-12-05 20:44:39	s	1 -87586.745	0 +374828.66	810.0	–	C57
2018-12-05 21:14:39	S	03 58 46.469	-09 47 49.81	–	V	C57
2018-12-05 21:14:39	s	1 -88484.389	0 +374439.44	6680.0	–	C57
2018-12-05 21:44:39	S	03 58 43.889	-09 48 31.32	–	V	C57
2018-12-05 21:44:39	s	1 -89379.929	0 +374041.85	450.0	–	C57
2018-12-05 22:14:39	S	03 58 41.362	-09 49 12.25	–	V	C57
2018-12-05 22:14:39	s	1 -90273.343	0 +373635.87	2010.0	–	C57
2018-12-05 22:44:39	S	03 58 38.935	-09 49 50.66	–	V	C57
2018-12-05 22:44:39	s	1 -91164.608	0 +373221.51	1200.0	–	C57
2018-12-05 23:14:39	S	03 58 36.487	-09 50 31.63	–	V	C57
2018-12-05 23:14:39	s	1 -92053.701	0 +372798.76	7900.0	–	C57
2018-12-05 23:44:39	S	03 58 33.962	-09 51 11.09	–	V	C57
2018-12-05 23:44:39	s	1 -92940.600	0 +372367.63	1980.0	–	C57
2018-12-06 00:14:39	S	03 58 31.399	-09 51 52.56	–	V	C57
2018-12-06 00:14:39	s	1 -93825.280	0 +371928.10	3290.0	–	C57
2018-12-06 00:44:39	S	03 58 28.908	-09 52 32.77	–	V	C57
2018-12-06 00:44:39	s	1 -94707.720	0 +371480.18	1700.0	–	C57
2018-12-06 01:14:39	S	03 58 26.470	-09 53 12.48	–	V	C57

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12538 (1998 OH)