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
2020-12-27 23:04:08	S	06 55 22.318	-48 56 30.48	–	V	C57
2020-12-27 23:04:08	s	1 -185848.27	3 +258995.53	7790.0	–	C57
2020-12-27 23:14:08	S	06 55 21.869	-48 56 53.34	–	V	C57
2020-12-27 23:14:08	s	1 -185995.88	6 +258462.67	750.0	–	C57
2020-12-27 23:24:08	S	06 55 21.398	-48 57 16.70	–	V	C57
2020-12-27 23:24:08	s	1 -186142.67	2 +257928.68	2470.0	–	C57
2020-12-27 23:34:08	S	06 55 20.890	-48 57 40.03	–	V	C57
2020-12-27 23:34:08	s	1 -186288.62	7 +257393.56	2950.0	–	C57
2020-12-27 23:44:08	S	06 55 20.314	-48 58 01.74	–	V	C57
2020-12-27 23:44:08	s	1 -186433.74	9 +256857.30	2160.0	–	C57
2020-12-27 23:54:08	S	06 55 19.877	-48 58 25.57	–	V	C57
2020-12-27 23:54:08	s	1 -186578.03	3 +256319.90	120.0	–	C57
2020-12-28 00:04:08	S	06 55 19.502	-48 58 48.65	–	V	C57
2020-12-28 00:04:08	s	1 -186721.47	6 +255781.37	6820.0	–	C57
2020-12-28 00:14:08	S	06 55 18.996	-48 59 11.80	–	V	C57
2020-12-28 00:14:08	s	1 -186864.07	5 +255241.69	2250.0	–	C57
2020-12-28 00:24:08	S	06 55 18.430	-48 59 33.83	–	V	C57
2020-12-28 00:24:08	s	1 -187005.82	7 +254700.88	6400.0	–	C57
2020-12-28 00:34:08	S	06 55 17.830	-48 59 57.55	–	V	C57
2020-12-28 00:34:08	s	1 -187146.72	8 +254158.93	9280.0	–	C57
2020-12-28 00:44:08	S	06 55 17.484	-49 00 20.52	–	V	C57
2020-12-28 00:44:08	s	1 -187286.77	4 +253615.83	870.0	–	C57
2020-12-28 00:54:08	S	06 55 16.999	-49 00 42.88	–	V	C57
2020-12-28 00:54:08	s	1 -187425.96	3 +253071.58	1180.0	–	C57
2020-12-28 01:04:08	S	06 55 16.438	-49 01 06.53	–	V	C57
2020-12-28 01:04:08	s	1 -187564.29	0 +252526.19	190.0	–	C57
2020-12-28 01:14:08	S	06 55 15.910	-49 01 29.53	–	V	C57
2020-12-28 01:14:08	s	1 -187701.75	3 +251979.66	7900.0	–	C57
2020-12-28 01:24:08	S	06 55 15.403	-49 01 51.92	–	V	C57
2020-12-28 01:24:08	s	1 -187838.34	7 +251431.97	4310.0	–	C57
2020-12-28 01:34:08	S	06 55 15.012	-49 02 15.50	–	V	C57
2020-12-28 01:34:08	s	1 -187974.07	0 +250883.14	9400.0	–	C57
2020-12-28 01:44:08	S	06 55 14.491	-49 02 36.89	–	V	C57
2020-12-28 01:44:08	s	1 -188108.91	7 +250333.15	3180.0	–	C57
2020-12-28 01:54:08	S	06 55 13.891	-49 03 01.40	–	V	C57
2020-12-28 01:54:08	s	1 -188242.88	5 +249782.01	5650.0	–	C57
2020-12-28 02:04:08	S	06 55 13.495	-49 03 23.76	–	V	C57
2020-12-28 02:04:08	s	1 -188375.97	0 +249229.72	6780.0	–	C57
2020-12-28 02:14:08	S	06 55 12.934	-49 03 47.56	–	V	C57
2020-12-28 02:14:08	s	1 -188508.17	0 +248676.27	6590.0	–	C57
2020-12-28 02:24:08	S	06 55 12.360	-49 04 07.25	–	V	C57
2020-12-28 02:24:08	s	1 -188639.47	9 +248121.67	5050.0	–	C57
2020-12-28 02:34:08	S	06 55 11.947	-49 04 32.09	–	V	C57
2020-12-28 02:34:08	s	1 -188769.89	5 +247565.91	2180.0	–	C57
2020-12-28 02:44:08	S	06 55 11.542	-49 04 54.59	–	V	C57
2020-12-28 02:44:08	s	1 -188899.41	4 +247008.98	7960.0	–	C57
2020-12-28 02:54:08	S	06 55 10.908	-49 05 17.95	–	V	C57
2020-12-28 02:54:08	s	1 -189028.03	2 +246450.90	2390.0	–	C57
2020-12-28 03:04:08	S	06 55 10.430	-49 05 40.85	–	V	C57
2020-12-28 03:04:08	s	1 -189155.74	6 +245891.66	5450.0	–	C57

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12538 (1998 OH)