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
2020-12-29 23:14:08	S	06 53 04.874	-50 43 04.30	–	V	C57
2020-12-29 23:14:08	s	1 -171339.91	6 +51978.212	8210.0	–	C57
2020-12-29 23:24:08	S	06 53 04.375	-50 43 25.46	–	V	C57
2020-12-29 23:24:08	s	1 -170947.18	3 +51062.416	1650.0	–	C57
2020-12-29 23:34:08	S	06 53 03.934	-50 43 46.81	–	V	C57
2020-12-29 23:34:08	s	1 -170550.25	2 +50145.373	8830.0	–	C57
2020-12-30 00:04:08	S	06 53 02.906	-50 44 50.17	–	V	C57
2020-12-30 00:04:08	s	1 -169333.91	7 +47386.854	2320.0	–	C57
2020-12-30 00:14:08	S	06 53 02.438	-50 45 10.91	–	V	C57
2020-12-30 00:14:08	s	1 -168919.83	7 +46464.917	3950.0	–	C57
2020-12-30 00:24:08	S	06 53 01.987	-50 45 33.08	–	V	C57
2020-12-30 00:24:08	s	1 -168501.37	9 +45541.782	9050.0	–	C57
2021-01-01 03:04:08	S	06 52 13.898	-52 38 45.49	–	V	C57
2021-01-01 03:04:08	s	1 +143824.79	5 +46893.122	2940.0	–	C57
2021-01-01 03:14:08	S	06 52 13.457	-52 39 11.41	–	V	C57
2021-01-01 03:14:08	s	1 +144195.25	1 +47962.457	4950.0	–	C57
2021-01-01 03:24:08	S	06 52 13.219	-52 39 36.29	–	V	C57
2021-01-01 03:24:08	s	1 +144559.97	4 +49029.880	8630.0	–	C57
2021-01-01 03:34:08	S	06 52 12.941	-52 40 00.41	–	V	C57
2021-01-01 03:34:08	s	1 +144919.02	4 +50095.376	4080.0	–	C57
2021-01-01 03:44:08	S	06 52 12.552	-52 40 27.26	–	V	C57
2021-01-01 03:44:08	s	1 +145272.46	3 +51158.928	1390.0	–	C57
2021-01-01 04:14:08	S	06 52 11.933	-52 41 41.42	–	V	C57
2021-01-01 04:14:08	s	1 +146299.71	1 +54337.773	5380.0	–	C57
2021-01-01 04:24:08	S	06 52 11.359	-52 42 05.11	–	V	C57
2021-01-01 04:24:08	s	1 +146631.29	9 +55393.405	1010.0	–	C57
2021-01-01 04:34:08	S	06 52 10.937	-52 42 30.60	–	V	C57
2021-01-01 04:34:08	s	1 +146957.56	9 +56447.024	8950.0	–	C57
2021-01-01 04:44:08	S	06 52 10.620	-52 42 58.10	–	V	C57
2021-01-01 04:44:08	s	1 +147278.57	7 +57498.618	9260.0	–	C57
2021-01-01 04:54:08	S	06 52 10.445	-52 43 21.61	–	V	C57
2021-01-01 04:54:08	s	1 +147594.37	9 +58548.175	2030.0	–	C57
2021-01-01 05:04:08	S	06 52 10.104	-52 43 46.78	–	V	C57
2021-01-01 05:04:08	s	1 +147905.02	8 +59595.685	7350.0	–	C57
2021-01-01 05:14:08	S	06 52 09.842	-52 44 12.23	–	V	C57
2021-01-01 05:14:08	s	1 +148210.58	0 +60641.137	5300.0	–	C57
2021-01-01 05:24:08	S	06 52 09.518	-52 44 36.78	–	V	C57
2021-01-01 05:24:08	s	1 +148511.08	7 +61684.521	5950.0	–	C57
2021-01-01 05:34:08	S	06 52 09.146	-52 45 01.08	–	V	C57
2021-01-01 05:34:08	s	1 +148806.60	1 +62725.827	9380.0	–	C57
2021-01-01 05:44:08	S	06 52 08.842	-52 45 26.89	–	V	C57
2021-01-01 05:44:08	s	1 +149097.17	6 +63765.048	5660.0	–	C57
2021-01-01 05:54:08	S	06 52 08.410	-52 45 52.20	–	V	C57
2021-01-01 05:54:08	s	1 +149382.86	1 +64802.174	4890.0	–	C57
2021-01-01 06:04:08	S	06 52 08.129	-52 46 17.22	–	V	C57
2021-01-01 06:04:08	s	1 +149663.70	7 +65837.196	7120.0	–	C57
2021-01-01 06:14:08	S	06 52 07.800	-52 46 42.20	–	V	C57
2021-01-01 06:14:08	s	1 +149939.76	4 +66870.109	2440.0	–	C57
2021-01-01 06:24:08	S	06 52 07.634	-52 47 06.76	–	V	C57
2021-01-01 06:24:08	s	1 +150211.08	1 +67900.903	910.0	–	C57

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12538 (1998 OH)