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
2021-01-09 17:34:08	s	1 -158145.60	6 +321681.60	7240.0	–	C57
2021-01-09 17:44:08	S	06 37 47.069	-60 21 16.60	–	V	C57
2021-01-09 17:44:08	s	1 -158374.72	6 +321298.22	6840.0	–	C57
2021-01-09 17:54:08	S	06 37 46.241	-60 21 37.01	–	V	C57
2021-01-09 17:54:08	s	1 -158603.35	3 +320913.86	5660.0	–	C57
2021-01-09 18:04:08	S	06 37 45.365	-60 21 56.52	–	V	C57
2021-01-09 18:04:08	s	1 -158831.48	4 +320528.52	3690.0	–	C57
2021-01-09 18:14:08	S	06 37 44.429	-60 22 15.85	–	V	C57
2021-01-09 18:14:08	s	1 -159059.12	0 +320142.20	950.0	–	C57
2021-01-09 18:24:08	S	06 37 43.406	-60 22 35.15	–	V	C57
2021-01-09 18:24:08	s	1 -159286.25	7 +319754.90	7420.0	–	C57
2021-01-09 18:34:08	S	06 37 42.722	-60 22 54.37	–	V	C57
2021-01-09 18:34:08	s	1 -159512.89	5 +319366.62	3100.0	–	C57
2021-01-09 18:44:08	S	06 37 41.897	-60 23 13.74	–	V	C57
2021-01-09 18:44:08	s	1 -159739.03	1 +318977.35	7980.0	–	C57
2021-01-09 19:24:08	S	06 37 38.652	-60 24 31.14	–	V	C57
2021-01-09 19:24:08	s	1 -160638.52	6 +317410.44	9560.0	–	C57
2021-01-09 19:44:08	S	06 37 36.422	-60 25 11.46	–	V	C57
2021-01-09 19:44:08	s	1 -161085.22	0 +316621.07	520.0	–	C57
2021-01-09 19:54:08	S	06 37 35.431	-60 25 32.30	–	V	C57
2021-01-09 19:54:08	s	1 -161307.79	7 +316224.90	9790.0	–	C57
2021-01-09 20:14:08	S	06 37 33.814	-60 26 10.25	–	V	C57
2021-01-09 20:14:08	s	1 -161751.40	4 +315429.60	5860.0	–	C57
2021-01-09 20:24:08	S	06 37 32.914	-60 26 28.25	–	V	C57
2021-01-09 20:24:08	s	1 -161972.42	9 +315030.46	2670.0	–	C57
2021-01-09 20:34:08	S	06 37 31.951	-60 26 47.98	–	V	C57
2021-01-09 20:34:08	s	1 -162192.93	4 +314630.33	8660.0	–	C57
2021-01-09 20:44:08	S	06 37 31.138	-60 27 08.24	–	V	C57
2021-01-09 20:44:08	s	1 -162412.91	6 +314229.20	3810.0	–	C57
2021-01-09 20:54:08	S	06 37 30.269	-60 27 26.10	–	V	C57
2021-01-09 20:54:08	s	1 -162632.37	4 +313827.08	8140.0	–	C57
2021-01-09 21:04:08	S	06 37 29.292	-60 27 46.01	–	V	C57
2021-01-09 21:04:08	s	1 -162851.30	6 +313423.97	1630.0	–	C57
2021-01-09 21:14:08	S	06 37 28.471	-60 28 06.20	–	V	C57
2021-01-09 21:14:08	s	1 -163069.71	0 +313019.86	4290.0	–	C57
2021-01-09 21:24:08	S	06 37 27.562	-60 28 24.74	–	V	C57
2021-01-09 21:24:08	s	1 -163287.58	4 +312614.76	6100.0	–	C57
2021-01-09 21:34:08	S	06 37 26.674	-60 28 44.40	–	V	C57
2021-01-09 21:34:08	s	1 -163504.92	6 +312208.66	7070.0	–	C57
2021-01-09 21:44:08	S	06 37 25.716	-60 29 04.09	–	V	C57
2021-01-09 21:44:08	s	1 -163721.73	5 +311801.56	7200.0	–	C57
2021-01-09 21:54:08	S	06 37 24.809	-60 29 23.03	–	V	C57
2021-01-09 21:54:08	s	1 -163938.00	9 +311393.46	6480.0	–	C57
2021-01-09 22:04:08	S	06 37 24.019	-60 29 43.19	–	V	C57
2021-01-09 22:04:08	s	1 -164153.74	5 +310984.36	4900.0	–	C57
2021-01-09 22:14:08	S	06 37 23.131	-60 30 02.23	–	V	C57
2021-01-09 22:14:08	s	1 -164368.94	2 +310574.26	2470.0	–	C57
2021-01-09 22:24:08	S	06 37 22.226	-60 30 22.03	–	V	C57
2021-01-09 22:24:08	s	1 -164583.59	8 +310163.16	9180.0	–	C57
2021-01-09 22:34:08	S	06 37 21.413	-60 30 41.18	–	V	C57

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12538 (1998 OH)