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
2023-07-15 16:58:32	S	21 52 31.382	-83 52 34.54	–	V	C57
2023-07-15 17:18:32	S	21 52 21.698	-83 53 21.62	–	V	C57
2023-07-15 17:38:32	S	21 52 09.314	-83 54 04.68	–	V	C57
2023-07-15 18:18:32	S	21 51 50.796	-83 55 25.86	–	V	C57
2023-07-15 18:18:32	s	1 +12418.251	0 -150208.81	9700.0	–	C57
2023-07-15 21:58:32	S	21 49 59.575	-84 02 53.84	–	V	C57
2023-07-15 21:58:32	s	1 +31458.502	0 -147976.92	310.0	–	C57
2023-07-15 22:38:32	S	21 49 43.164	-84 04 11.35	–	V	C57
2023-07-15 22:38:32	s	1 +34873.525	0 -147304.56	610.0	–	C57
2023-07-15 22:58:32	S	21 49 32.777	-84 04 49.66	–	V	C57
2023-07-15 22:58:32	s	1 +36574.276	0 -146939.31	5360.0	–	C57
2023-07-15 23:18:32	S	21 49 20.165	-84 05 32.68	–	V	C57
2023-07-15 23:18:32	s	1 +38270.286	0 -146555.02	8690.0	–	C57
2023-07-15 23:38:32	S	21 49 11.851	-84 06 15.44	–	V	C57
2023-07-15 23:38:32	s	1 +39961.303	0 -146151.60	8360.0	–	C57
2023-07-16 00:38:32	S	21 48 40.538	-84 08 13.96	–	V	C57
2023-07-16 00:38:32	s	1 +45003.263	0 -144830.99	6090.0	–	C57
2023-07-16 00:58:32	S	21 48 30.130	-84 08 52.98	–	V	C57
2023-07-16 00:58:32	s	1 +46673.003	0 -144354.70	8650.0	–	C57
2023-07-16 01:18:31	S	21 48 19.034	-84 09 33.77	–	V	C57
2023-07-16 01:18:31	s	1 +48337.047	0 -143860.79	5240.0	–	C57
2023-07-16 01:38:32	S	21 48 08.554	-84 10 14.27	–	V	C57
2023-07-16 01:38:32	s	1 +49995.154	0 -143349.23	3780.0	–	C57
2023-07-16 01:58:32	S	21 47 56.338	-84 10 57.47	–	V	C57
2023-07-16 01:58:32	s	1 +51647.327	0 -142820.66	5770.0	–	C57
2023-07-16 02:18:32	S	21 47 46.454	-84 11 34.12	–	V	C57
2023-07-16 02:18:32	s	1 +53293.388	0 -142275.20	10.0	–	C57
2023-07-16 02:38:32	S	21 47 34.798	-84 12 15.73	–	V	C57
2023-07-16 02:38:32	s	1 +54933.104	0 -141712.81	4540.0	–	C57
2023-07-16 02:58:32	S	21 47 24.655	-84 12 53.06	–	V	C57
2023-07-16 02:58:32	s	1 +56566.500	0 -141134.14	970.0	–	C57
2023-07-16 03:18:32	S	21 47 11.801	-84 13 36.19	–	V	C57
2023-07-16 03:18:32	s	1 +58193.408	0 -140539.29	8200.0	–	C57
2023-07-16 03:38:32	S	21 47 02.630	-84 14 12.19	–	V	C57
2023-07-16 03:38:32	s	1 +59813.602	0 -139928.24	4350.0	–	C57
2023-07-16 03:58:32	S	21 46 50.815	-84 14 53.48	–	V	C57
2023-07-16 03:58:32	s	1 +61427.128	0 -139301.62	1160.0	–	C57
2023-07-16 05:18:32	S	21 46 06.593	-84 17 37.54	–	V	C57
2023-07-16 05:18:32	s	1 +67811.710	0 -136642.29	8690.0	–	C57
2023-07-16 05:38:32	S	21 45 57.670	-84 18 02.92	–	V	C57
2023-07-16 05:38:32	s	1 +69389.918	0 -135940.30	8480.0	–	C57
2023-07-16 05:58:32	S	21 45 43.898	-84 18 44.32	–	V	C57
2023-07-16 05:58:32	s	1 +70960.871	0 -135224.12	7260.0	–	C57
2023-07-16 06:38:32	S	21 45 20.832	-84 20 07.62	–	V	C57
2023-07-16 06:38:32	s	1 +74080.383	0 -133749.54	7550.0	–	C57
2023-07-16 06:58:31	S	21 45 08.882	-84 20 46.39	–	V	C57
2023-07-16 06:58:31	s	1 +75628.838	0 -132991.70	9450.0	–	C57
2023-07-16 08:18:32	S	21 44 20.506	-84 23 24.83	–	V	C57
2023-07-16 08:18:32	s	1 +81745.372	0 -129828.09	370.0	–	C57
2023-07-16 08:58:32	S	21 43 56.314	-84 24 42.41	–	V	C57

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2102 Tantalus (1975 YA)