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
2020-04-26 10:43:50	C	21 05 25.83	+13 58 44.9	–	V	703
2020-04-26 14:24:55	C	21 05 31.93	+13 55 11.2	–	V	T08
2020-04-26 14:36:29	C	21 05 32.23	+13 54 59.8	–	V	T08
2020-04-26 14:55:16	C	21 05 32.71	+13 54 41.5	–	V	T08
2020-04-26 15:06:30	C	21 05 33.02	+13 54 30.7	–	V	T08
2020-04-28 14:01:11	C	21 06 48.89	+13 07 23.4	–	V	T05
2020-04-28 14:09:09	C	21 06 49.08	+13 07 14.8	–	V	T05
2020-04-28 14:38:00	C	21 06 49.79	+13 06 45.4	–	V	T05
2020-04-28 14:51:56	C	21 06 50.10	+13 06 31.1	–	V	T05
2020-04-29 10:14:05	C	21 07 20.26	+12 46 19.1	–	V	703
2020-04-29 10:21:41	C	21 07 20.46	+12 46 11.2	–	V	703
2020-04-29 10:29:17	C	21 07 20.63	+12 46 03.1	–	V	703
2020-04-29 10:36:53	C	21 07 20.82	+12 45 55.3	–	V	703
2020-05-03 09:56:50	C	21 09 37.86	+11 00 02.5	–	V	703
2020-05-03 10:04:59	C	21 09 37.99	+10 59 52.9	–	V	703
2020-05-03 10:13:07	C	21 09 38.18	+10 59 44.1	–	V	703
2020-05-03 13:14:51	C	21 09 42.29	+10 56 12.3	–	V	T08
2020-05-03 13:24:09	C	21 09 42.51	+10 56 01.4	–	V	T08
2020-05-03 13:29:31	C	21 09 42.60	+10 55 55.1	–	V	T08
2020-05-04 13:55:20	C	21 10 14.309	+10 26 42.86	–	U	F52
2020-05-04 14:06:49	C	21 10 14.54	+10 26 29.3	–	V	T08
2020-05-04 14:12:08	C	21 10 14.62	+10 26 22.9	–	V	T08
2020-05-04 14:15:53	C	21 10 14.704	+10 26 18.02	–	U	F52
2020-05-04 14:26:12	C	21 10 14.898	+10 26 05.57	–	U	F52
2020-05-04 14:36:45	C	21 10 15.08	+10 25 53.0	–	V	T08
2020-05-05 13:12:55	C	21 10 43.37	+09 58 02.7	–	V	T05
2020-05-05 13:18:12	C	21 10 43.50	+09 57 56.2	–	V	T05
2020-05-05 13:45:22	C	21 10 43.97	+09 57 22.2	–	V	T05
2020-05-06 10:06:49	C	21 11 08.14	+09 31 34.4	–	V	703
2020-05-06 10:15:29	C	21 11 08.44	+09 31 23.1	–	V	703
2020-05-06 10:24:08	C	21 11 08.57	+09 31 11.7	–	V	703
2020-05-11 16:22:06	S	21 13 12.72	+06 35 42.3	–	L	C51
2020-05-11 19:30:25	S	21 13 15.22	+06 30 56.4	–	L	C51
2020-05-11 22:38:44	S	21 13 17.69	+06 26 08.7	–	L	C51
2020-05-11 22:38:54	S	21 13 17.67	+06 26 09.6	–	L	C51
2020-05-12 00:12:59	S	21 13 18.91	+06 23 45.4	–	L	C51
2020-05-12 01:47:14	S	21 13 20.12	+06 21 21.5	–	L	C51
2020-05-12 03:21:17	S	21 13 21.40	+06 18 55.7	–	L	C51
2020-05-12 04:55:33	S	21 13 22.66	+06 16 33.2	–	L	C51
2020-05-12 06:29:37	S	21 13 23.77	+06 14 05.6	–	L	C51
2020-05-12 09:38:07	S	21 13 26.16	+06 09 15.9	–	L	C51
2020-05-12 12:46:26	S	21 13 28.41	+06 04 21.5	–	L	C51
2020-05-13 14:04:06	C	21 13 46.82	+05 24 12.1	–	V	T05
2020-05-13 14:18:38	C	21 13 46.96	+05 23 48.7	–	V	T05
2020-05-13 14:26:07	C	21 13 47.02	+05 23 36.5	–	V	T05
2020-05-13 14:40:07	C	21 13 47.13	+05 23 13.5	–	V	T05
2020-05-14 10:15:09	C	21 13 59.29	+04 51 04.5	–	V	703
2020-05-14 10:24:02	C	21 13 59.38	+04 50 50.0	–	V	703
2020-05-14 10:32:55	C	21 13 59.39	+04 50 35.2	–	V	703
2020-05-14 10:41:49	C	21 13 59.43	+04 50 19.5	–	V	703

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2102 Tantalus (1975 YA)