2102 Tantalus — IAA Minor Planet Database

Orbital Elements

Epoch (TDB)	2025-11-21 (JD 2461000.5)
Eccentricity (e)	0.2993501212 ± 6.46e-09
Semi-major axis (a)	1.2900609716 AU ± 2.87e-10
Inclination (i)	64.00517356° ± 3.04e-06
Long. of Asc. Node (Ω)	94.35226460° ± 4.17e-07
Arg. of Perihelion (ω)	61.49851571° ± 2.17e-06
Mean Anomaly (M)	347.35567572° ± 1.82e-06
Mean Motion (n)	0.6726620417°/day ± 2.24e-10
Perihelion dist (q)	0.90388106 AU ± 8.33e-09
Aphelion dist (Q)	1.67624088 AU ± 8.34e-09
Orbital Period	1.46526223 yr ± 4.88e-10

Physical Parameters

H (abs. magnitude)	16.00
G (slope)	0.15

Orbit Solution

Source	IAA
Solution Date	2026-05-31
RMS Residual	0.249″
Uncertainty	0
Orbit Type	Apollo
MOID	0.042239 AU
Observations Used	1824
Radar Obs Used	1
Gaia Obs Used	127
Oppositions	13
Arc Total	1976-2026
First Observation Used	1976-01-04
Last Observation Used	2026-04-05

Observations (2255)

Date	Type	RA	Dec	Mag	Band	Observatory
2023-07-10 07:45:12	S	22 18 16.104	-79 06 48.71	–	V	C57
2023-07-10 07:45:12	s	1 +26479.192	0 +319599.44	540.0	–	C57
2023-07-10 08:25:12	S	22 18 12.276	-79 08 17.02	–	V	C57
2023-07-10 08:25:12	s	1 +24771.158	0 +318867.68	530.0	–	C57
2023-07-10 08:45:12	S	22 18 09.806	-79 09 08.93	–	V	C57
2023-07-10 08:45:12	s	1 +23916.477	0 +318493.69	2660.0	–	C57
2023-07-10 09:05:12	S	22 18 06.730	-79 09 55.48	–	V	C57
2023-07-10 09:05:12	s	1 +23061.373	0 +318114.32	6080.0	–	C57
2023-07-10 10:05:12	S	22 18 00.718	-79 12 10.66	–	V	C57
2023-07-10 10:05:12	s	1 +20493.646	0 +316943.58	2500.0	–	C57
2023-07-10 10:25:12	S	22 17 58.394	-79 12 57.67	–	V	C57
2023-07-10 10:25:12	s	1 +19636.978	0 +316542.43	9580.0	–	C57
2023-07-10 10:45:12	S	22 17 57.434	-79 13 40.55	–	V	C57
2023-07-10 10:45:12	s	1 +18779.955	0 +316135.82	7250.0	–	C57
2023-07-10 11:25:12	S	22 17 52.658	-79 15 20.41	–	V	C57
2023-07-10 11:25:12	s	1 +17064.897	0 +315306.19	3850.0	–	C57
2023-07-10 11:45:12	S	22 17 50.354	-79 16 01.70	–	V	C57
2023-07-10 11:45:12	s	1 +16206.890	0 +314883.13	2460.0	–	C57
2023-07-10 12:05:12	S	22 17 48.403	-79 16 51.35	–	V	C57
2023-07-10 12:05:12	s	1 +15348.584	0 +314454.58	1150.0	–	C57
2023-07-10 12:25:12	S	22 17 46.315	-79 17 32.32	–	V	C57
2023-07-10 12:25:12	s	1 +14489.992	0 +314020.49	9700.0	–	C57
2023-07-10 14:25:12	S	22 17 32.402	-79 22 16.18	–	V	C57
2023-07-10 15:05:12	S	22 17 27.302	-79 23 45.06	–	V	C57
2023-07-10 15:25:12	S	22 17 26.018	-79 24 30.42	–	V	C57
2023-07-10 15:45:12	S	22 17 24.415	-79 25 20.14	–	V	C57
2023-07-10 16:05:12	S	22 17 21.192	-79 26 08.77	–	V	C57
2023-07-10 16:45:12	S	22 17 16.826	-79 27 35.78	–	V	C57
2023-07-10 17:05:12	S	22 17 15.773	-79 28 24.42	–	V	C57
2023-07-10 19:45:12	S	22 16 53.040	-79 34 39.32	–	V	C57
2023-07-10 20:45:12	S	22 16 48.540	-79 36 51.12	–	V	C57
2023-07-10 21:25:12	S	22 16 44.258	-79 38 29.26	–	V	C57
2023-07-10 22:45:12	S	22 16 34.586	-79 41 32.21	–	V	C57
2023-07-10 22:45:12	s	1 -12184.275	0 +297765.86	150.0	–	C57
2023-07-10 23:05:12	S	22 16 32.892	-79 42 04.97	–	V	C57
2023-07-10 23:05:12	s	1 -13043.781	0 +297149.39	6020.0	–	C57
2023-07-10 23:25:12	S	22 16 29.654	-79 43 01.20	–	V	C57
2023-07-10 23:25:12	s	1 -13903.036	0 +296527.00	6570.0	–	C57
2023-07-10 23:45:12	S	22 16 27.262	-79 43 44.11	–	V	C57
2023-07-10 23:45:12	s	1 -14762.022	0 +295898.70	1680.0	–	C57
2023-07-11 00:25:12	S	22 16 21.905	-79 45 19.51	–	V	C57
2023-07-11 00:25:12	s	1 -16479.115	0 +294624.39	4950.0	–	C57
2023-07-11 00:45:12	S	22 16 20.858	-79 46 01.67	–	V	C57
2023-07-11 00:45:12	s	1 -17337.183	0 +293978.32	2690.0	–	C57
2023-07-11 02:06:03	C	22 18 54.091	-79 52 53.69	–	V	M22
2023-07-11 02:48:06	C	22 18 47.374	-79 54 31.07	–	V	M22
2023-07-11 02:57:32	C	22 18 45.874	-79 54 53.10	–	V	M22
2023-07-11 03:33:45	C	22 18 40.054	-79 56 16.22	–	V	M22
2023-07-11 13:05:12	S	22 14 49.512	-80 14 12.41	–	V	C57
2023-07-11 13:05:12	s	1 -48669.783	0 +265789.26	5060.0	–	C57

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2102 Tantalus (1975 YA)