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
2023-07-11 14:25:12	S	22 14 39.583	-80 17 08.05	–	V	C57
2023-07-11 14:25:12	s	1 -51982.686	0 +262227.87	0.407	–	C57
2023-07-11 18:25:12	S	22 14 06.574	-80 26 04.27	–	V	C57
2023-07-11 18:25:12	s	1 -61791.099	0 +250921.14	0.665	–	C57
2023-07-11 18:45:12	S	22 14 06.816	-80 26 59.32	–	V	C57
2023-07-11 18:45:12	s	1 -62598.580	0 +249936.30	0.351	–	C57
2023-07-11 19:05:12	S	22 14 02.990	-80 27 41.51	–	V	C57
2023-07-11 19:05:12	s	1 -63404.406	0 +248944.88	0.216	–	C57
2023-07-11 20:25:12	S	22 13 51.154	-80 30 40.64	–	V	C57
2023-07-11 20:25:12	s	1 -66610.451	0 +244912.78	0.761	–	C57
2023-07-11 20:45:12	S	22 13 49.788	-80 31 15.20	–	V	C57
2023-07-11 20:45:12	s	1 -67407.490	0 +243888.10	0.03	–	C57
2023-07-11 21:05:12	S	22 13 45.830	-80 32 08.52	–	V	C57
2023-07-11 21:05:12	s	1 -68202.683	0 +242856.77	0.307	–	C57
2023-07-11 21:45:12	S	22 13 41.938	-80 33 39.20	–	V	C57
2023-07-11 21:45:12	s	1 -69787.361	0 +240773.97	0.709	–	C57
2023-07-11 22:05:12	S	22 13 38.609	-80 34 26.87	–	V	C57
2023-07-11 22:05:12	s	1 -70576.793	0 +239722.53	0.797	–	C57
2023-07-11 23:05:12	S	22 13 32.798	-80 36 41.22	–	V	C57
2023-07-11 23:05:12	s	1 -72933.009	0 +236527.76	0.174	–	C57
2023-07-11 23:25:12	S	22 13 28.085	-80 37 23.95	–	V	C57
2023-07-11 23:25:12	s	1 -73714.273	0 +235449.32	0.571	–	C57
2023-07-12 00:05:12	S	22 13 22.824	-80 38 49.52	–	V	C57
2023-07-12 00:05:12	s	1 -75270.388	0 +233272.15	0.604	–	C57
2023-07-12 02:25:12	S	22 13 01.891	-80 44 00.85	–	V	C57
2023-07-12 02:25:12	s	1 -80645.497	0 +225437.51	0.174	–	C57
2023-07-12 02:45:12	S	22 12 59.342	-80 44 52.51	–	V	C57
2023-07-12 02:45:12	s	1 -81403.811	0 +224290.89	0.632	–	C57
2023-07-12 03:25:12	S	22 12 55.483	-80 46 14.23	–	V	C57
2023-07-12 03:25:12	s	1 -82912.892	0 +221977.05	0.795	–	C57
2023-07-12 03:45:12	S	22 12 51.811	-80 47 04.34	–	V	C57
2023-07-12 03:45:12	s	1 -83663.568	0 +220809.78	0.414	–	C57
2023-07-12 04:05:12	S	22 12 47.837	-80 47 53.30	–	V	C57
2023-07-12 04:05:12	s	1 -84411.628	0 +219635.64	0.365	–	C57
2023-07-12 04:45:12	S	22 12 44.352	-80 49 14.27	–	V	C57
2023-07-12 04:45:12	s	1 -85899.681	0 +217266.55	0.046	–	C57
2023-07-12 05:05:12	S	22 12 40.205	-80 50 05.24	–	V	C57
2023-07-12 05:05:12	s	1 -86639.612	0 +216071.64	0.733	–	C57
2023-07-12 05:45:12	S	22 12 35.825	-80 51 31.90	–	V	C57
2023-07-12 05:45:12	s	1 -88111.024	0 +213660.95	0.557	–	C57
2023-07-12 06:05:12	S	22 12 32.107	-80 52 16.50	–	V	C57
2023-07-12 06:05:12	s	1 -88842.442	0 +212445.20	0.65	–	C57
2023-07-12 06:25:12	S	22 12 29.393	-80 53 07.62	–	V	C57
2023-07-12 06:25:12	s	1 -89570.924	0 +211222.45	0.788	–	C57
2023-07-12 07:45:12	S	22 12 18.122	-80 55 54.73	–	V	C57
2023-07-12 07:45:12	s	1 -92454.712	0 +206261.72	0.191	–	C57
2023-07-12 08:05:12	S	22 12 13.786	-80 56 41.53	–	V	C57
2023-07-12 08:05:12	s	1 -93167.903	0 +205004.07	0.069	–	C57
2023-07-12 14:05:12	S	22 11 20.453	-81 10 05.16	–	V	C57
2023-07-12 14:05:12	s	1 -105410.02	9 +181162.11	0.662	–	C57

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2102 Tantalus (1975 YA)