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
2021-01-23 15:44:07	S	06 01 55.013	-70 38 33.54	–	V	C57
2021-01-23 15:44:07	s	1 -182525.99	5 +274155.91	3960.0	–	C57
2021-01-23 15:54:07	S	06 01 53.551	-70 38 48.95	–	V	C57
2021-01-23 15:54:07	s	1 -182701.59	8 +273672.67	1400.0	–	C57
2021-01-23 16:04:07	S	06 01 52.003	-70 39 04.21	–	V	C57
2021-01-23 16:04:07	s	1 -182876.47	4 +273188.35	7590.0	–	C57
2021-01-23 16:14:07	S	06 01 50.570	-70 39 19.51	–	V	C57
2021-01-23 16:14:07	s	1 -183050.62	1 +272702.93	2520.0	–	C57
2021-01-23 16:24:08	S	06 01 48.811	-70 39 34.81	–	V	C57
2021-01-23 16:24:08	s	1 -183224.03	6 +272216.43	6180.0	–	C57
2021-01-23 16:34:07	S	06 01 46.481	-70 39 49.25	–	V	C57
2021-01-23 16:34:07	s	1 -183396.71	6 +271728.84	8580.0	–	C57
2021-01-23 16:54:07	S	06 01 43.836	-70 40 22.15	–	V	C57
2021-01-23 16:54:07	s	1 -183739.86	0 +270750.38	9530.0	–	C57
2021-01-23 17:04:07	S	06 01 42.480	-70 40 37.20	–	V	C57
2021-01-23 17:04:07	s	1 -183910.31	9 +270259.51	8080.0	–	C57
2021-01-23 17:14:07	S	06 01 40.860	-70 40 53.44	–	V	C57
2021-01-23 17:14:07	s	1 -184080.03	1 +269767.55	5340.0	–	C57
2021-01-23 17:24:07	S	06 01 38.890	-70 41 07.33	–	V	C57
2021-01-23 17:24:07	s	1 -184248.99	5 +269274.50	1300.0	–	C57
2021-01-23 17:34:07	S	06 01 37.255	-70 41 22.96	–	V	C57
2021-01-23 17:34:07	s	1 -184417.20	8 +268780.34	5970.0	–	C57
2021-01-23 17:44:07	S	06 01 35.614	-70 41 37.28	–	V	C57
2021-01-23 17:44:07	s	1 -184584.66	6 +268285.10	9330.0	–	C57
2021-01-23 17:54:08	S	06 01 34.618	-70 41 56.11	–	V	C57
2021-01-23 17:54:08	s	1 -184751.36	7 +267788.75	1370.0	–	C57
2021-01-23 18:04:07	S	06 01 32.702	-70 42 11.16	–	V	C57
2021-01-23 18:04:07	s	1 -184917.30	8 +267291.31	2110.0	–	C57
2021-01-23 18:14:07	S	06 01 31.354	-70 42 27.47	–	V	C57
2021-01-23 18:14:07	s	1 -185082.48	6 +266792.76	1520.0	–	C57
2021-01-23 18:24:07	S	06 01 29.453	-70 42 42.08	–	V	C57
2021-01-23 18:24:07	s	1 -185246.89	8 +266293.11	9600.0	–	C57
2021-01-23 18:34:07	S	06 01 27.929	-70 42 57.82	–	V	C57
2021-01-23 18:34:07	s	1 -185410.54	1 +265792.37	6360.0	–	C57
2021-01-23 18:44:07	S	06 01 26.038	-70 43 12.22	–	V	C57
2021-01-23 18:44:07	s	1 -185573.41	3 +265290.52	1780.0	–	C57
2021-01-23 18:54:07	S	06 01 24.662	-70 43 27.48	–	V	C57
2021-01-23 18:54:07	s	1 -185735.51	0 +264787.56	5860.0	–	C57
2021-01-23 19:04:07	S	06 01 23.239	-70 43 43.10	–	V	C57
2021-01-23 19:04:07	s	1 -185896.82	9 +264283.50	8590.0	–	C57
2021-01-23 19:14:07	S	06 01 21.739	-70 43 59.38	–	V	C57
2021-01-23 19:14:07	s	1 -186057.36	8 +263778.33	9970.0	–	C57
2021-01-23 19:24:07	S	06 01 20.047	-70 44 14.93	–	V	C57
2021-01-23 19:24:07	s	1 -186217.12	4 +263272.06	9990.0	–	C57
2021-01-23 19:34:07	S	06 01 18.442	-70 44 30.91	–	V	C57
2021-01-23 19:34:07	s	1 -186376.09	3 +262764.67	8650.0	–	C57
2021-01-23 19:44:07	S	06 01 16.798	-70 44 44.88	–	V	C57
2021-01-23 19:44:07	s	1 -186534.27	2 +262256.18	5940.0	–	C57
2021-01-23 19:54:07	S	06 01 15.158	-70 44 59.57	–	V	C57
2021-01-23 19:54:07	s	1 -186691.65	9 +261746.57	1860.0	–	C57

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12538 (1998 OH)