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
2020-12-22 23:14:08	s	1 +23855.774	0 +393500.71	690.0	–	C57
2020-12-22 23:24:08	S	07 00 43.862	-44 03 06.30	–	V	C57
2020-12-22 23:24:08	s	1 +23514.075	0 +393635.02	6040.0	–	C57
2020-12-22 23:34:08	S	07 00 43.493	-44 03 32.04	–	V	C57
2020-12-22 23:34:08	s	1 +23172.315	0 +393768.42	1410.0	–	C57
2020-12-22 23:44:08	S	07 00 43.406	-44 04 01.13	–	V	C57
2020-12-22 23:44:08	s	1 +22830.496	0 +393900.89	6810.0	–	C57
2020-12-22 23:54:08	S	07 00 43.015	-44 04 27.37	–	V	C57
2020-12-22 23:54:08	s	1 +22488.618	0 +394032.45	2220.0	–	C57
2020-12-23 00:04:08	S	07 00 42.408	-44 04 45.59	–	V	C57
2020-12-23 00:04:08	s	1 +22146.683	0 +394163.09	7650.0	–	C57
2020-12-23 00:14:08	S	07 00 42.202	-44 05 12.91	–	V	C57
2020-12-23 00:14:08	s	1 +21804.691	0 +394292.81	3100.0	–	C57
2020-12-23 00:24:08	S	07 00 41.714	-44 05 40.56	–	V	C57
2020-12-23 00:24:08	s	1 +21462.642	0 +394421.61	8560.0	–	C57
2020-12-23 00:34:08	S	07 00 41.292	-44 06 06.84	–	V	C57
2020-12-23 00:34:08	s	1 +21120.539	0 +394549.50	4030.0	–	C57
2020-12-23 00:44:08	S	07 00 40.841	-44 06 32.04	–	V	C57
2020-12-23 00:44:08	s	1 +20778.381	0 +394676.47	9520.0	–	C57
2020-12-23 00:54:08	S	07 00 40.610	-44 06 57.92	–	V	C57
2020-12-23 00:54:08	s	1 +20436.169	0 +394802.52	5020.0	–	C57
2020-12-23 01:04:08	S	07 00 40.142	-44 07 23.05	–	V	C57
2020-12-23 01:04:08	s	1 +20093.905	0 +394927.66	540.0	–	C57
2020-12-23 01:14:08	S	07 00 39.768	-44 07 49.91	–	V	C57
2020-12-23 01:14:08	s	1 +19751.589	0 +395051.89	6060.0	–	C57
2020-12-23 01:24:08	S	07 00 39.326	-44 08 16.22	–	V	C57
2020-12-23 01:24:08	s	1 +19409.223	0 +395175.20	1590.0	–	C57
2020-12-23 01:34:08	S	07 00 38.873	-44 08 42.04	–	V	C57
2020-12-23 01:34:08	s	1 +19066.806	0 +395297.60	7130.0	–	C57
2020-12-23 01:44:08	S	07 00 38.647	-44 09 06.95	–	V	C57
2020-12-23 01:44:08	s	1 +18724.340	0 +395419.08	2680.0	–	C57
2020-12-23 01:54:08	S	07 00 38.354	-44 09 32.18	–	V	C57
2020-12-23 01:54:08	s	1 +18381.825	0 +395539.65	8230.0	–	C57
2020-12-23 02:04:08	S	07 00 37.836	-44 09 56.41	–	V	C57
2020-12-23 02:04:08	s	1 +18039.263	0 +395659.31	3780.0	–	C57
2020-12-23 02:14:08	S	07 00 37.421	-44 10 22.48	–	V	C57
2020-12-23 02:14:08	s	1 +17696.654	0 +395778.05	9340.0	–	C57
2020-12-23 02:24:08	S	07 00 37.070	-44 10 49.48	–	V	C57
2020-12-23 02:24:08	s	1 +17353.999	0 +395895.89	4910.0	–	C57
2020-12-23 02:34:08	S	07 00 36.878	-44 11 15.76	–	V	C57
2020-12-23 02:34:08	s	1 +17011.299	0 +396012.81	470.0	–	C57
2020-12-23 02:44:08	S	07 00 36.370	-44 11 40.99	–	V	C57
2020-12-23 02:44:08	s	1 +16668.555	0 +396128.82	6040.0	–	C57
2020-12-23 02:54:08	S	07 00 35.938	-44 12 07.06	–	V	C57
2020-12-23 02:54:08	s	1 +16325.768	0 +396243.92	1600.0	–	C57
2020-12-23 03:04:08	S	07 00 35.616	-44 12 32.83	–	V	C57
2020-12-23 03:04:08	s	1 +15982.938	0 +396358.11	7160.0	–	C57
2020-12-23 03:14:08	S	07 00 35.316	-44 12 58.50	–	V	C57
2020-12-23 03:14:08	s	1 +15640.066	0 +396471.39	2720.0	–	C57
2020-12-23 03:24:08	S	07 00 34.927	-44 13 24.31	–	V	C57

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12538 (1998 OH)