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
2023-07-12 15:45:12	S	22 11 05.993	-81 13 46.34	–	V	C57
2023-07-12 15:45:12	s	1 -108586.20	1 +174132.72	0.805	–	C57
2023-07-12 16:05:12	S	22 11 05.218	-81 14 29.26	–	V	C57
2023-07-12 16:05:12	s	1 -109208.38	4 +172705.61	0.653	–	C57
2023-07-12 16:25:12	S	22 11 01.798	-81 15 14.69	–	V	C57
2023-07-12 16:25:12	s	1 -109826.05	3 +171271.39	0.234	–	C57
2023-07-12 17:05:12	S	22 10 54.614	-81 16 43.07	–	V	C57
2023-07-12 17:05:12	s	1 -111047.67	0 +168381.74	0.474	–	C57
2023-07-12 17:45:12	S	22 10 50.177	-81 18 11.66	–	V	C57
2023-07-12 17:45:12	s	1 -112250.53	0 +165463.77	0.099	–	C57
2023-07-12 18:25:12	S	22 10 42.391	-81 19 34.25	–	V	C57
2023-07-12 18:25:12	s	1 -113434.15	6 +162517.55	0.737	–	C57
2023-07-12 18:45:12	S	22 10 41.618	-81 20 20.94	–	V	C57
2023-07-12 18:45:12	s	1 -114018.57	4 +161033.84	0.161	–	C57
2023-07-12 20:05:12	S	22 10 28.843	-81 23 24.79	–	V	C57
2023-07-12 20:05:12	s	1 -116305.48	5 +155028.62	0.758	–	C57
2023-07-12 20:45:12	S	22 10 22.003	-81 24 51.52	–	V	C57
2023-07-12 20:45:12	s	1 -117417.47	2 +151983.82	0.983	–	C57
2023-07-12 22:25:12	S	22 10 08.453	-81 28 26.54	–	V	C57
2023-07-12 22:25:12	s	1 -120101.17	3 +144249.54	0.264	–	C57
2023-07-12 23:05:12	S	22 09 59.251	-81 29 56.18	–	V	C57
2023-07-12 23:05:12	s	1 -121134.57	9 +141107.16	0.639	–	C57
2023-07-13 09:25:12	S	22 08 15.432	-81 52 41.38	–	V	C57
2023-07-13 09:25:12	s	1 -133687.13	7 +88984.563	0.544	–	C57
2023-07-13 11:05:12	S	22 07 58.754	-81 56 24.61	–	V	C57
2023-07-13 11:05:12	s	1 -134996.29	3 +80016.678	0.941	–	C57
2023-07-13 12:05:12	S	22 07 47.465	-81 58 25.79	–	V	C57
2023-07-13 12:05:12	s	1 -135670.37	1 +74569.074	0.045	–	C57
2023-07-13 14:05:12	S	22 07 26.750	-82 02 49.27	–	V	C57
2023-07-13 14:05:12	s	1 -136752.37	6 +63530.364	0.656	–	C57
2023-07-13 14:45:12	S	22 07 19.985	-82 04 16.64	–	V	C57
2023-07-13 14:45:12	s	1 -137031.43	9 +59812.020	0.584	–	C57
2023-07-14 00:35:11	C	22 04 30.442	-82 28 54.52	–	V	M22
2023-07-14 00:38:35	C	22 04 29.424	-82 29 01.86	–	V	M22
2023-07-14 00:43:09	C	22 04 27.859	-82 29 11.40	–	V	M22
2023-07-14 01:22:18	C	22 04 16.258	-82 30 33.30	–	V	M22
2023-07-15 12:18:32	S	21 54 34.980	-83 43 03.79	–	V	C57
2023-07-15 12:18:32	s	1 -19044.509	0 -147953.59	7650.0	–	C57
2023-07-15 12:38:32	S	21 54 27.190	-83 43 38.64	–	V	C57
2023-07-15 12:38:32	s	1 -17307.952	0 -148284.65	9450.0	–	C57
2023-07-15 12:58:32	S	21 54 17.494	-83 44 26.38	–	V	C57
2023-07-15 12:58:32	s	1 -15568.505	0 -148591.05	9320.0	–	C57
2023-07-15 13:18:32	S	21 54 08.729	-83 45 02.74	–	V	C57
2023-07-15 13:18:32	s	1 -13826.451	0 -148872.70	4770.0	–	C57
2023-07-15 14:58:32	S	21 53 24.905	-83 48 33.34	–	V	C57
2023-07-15 15:18:32	S	21 53 15.530	-83 49 14.95	–	V	C57
2023-07-15 15:38:32	S	21 53 04.978	-83 49 57.68	–	V	C57
2023-07-15 15:58:32	S	21 52 56.722	-83 50 35.27	–	V	C57
2023-07-15 16:18:32	S	21 52 47.122	-83 51 16.63	–	V	C57
2023-07-15 16:38:32	S	21 52 38.906	-83 52 02.14	–	V	C57

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2102 Tantalus (1975 YA)