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
2019-12-06 10:57:33	S	10 49 15.713	-01 36 47.27	–	L	C51
2019-12-06 14:05:52	S	10 50 12.842	-01 22 17.29	–	L	C51
2019-12-06 17:14:11	S	10 51 10.514	-01 07 38.03	–	L	C51
2019-12-06 20:22:30	S	10 52 08.729	-00 52 49.69	–	L	C51
2019-12-06 23:30:49	S	10 53 07.512	-00 37 52.18	–	L	C51
2019-12-07 02:39:09	S	10 54 06.847	-00 22 45.26	–	L	C51
2019-12-07 05:47:27	S	10 55 06.734	-00 07 29.06	–	L	C51
2019-12-07 08:55:47	S	10 56 07.207	+00 07 56.60	–	L	C51
2019-12-07 12:04:06	S	10 57 08.263	+00 23 31.92	–	L	C51
2019-12-07 14:32:35	C	10 57 58.42	+00 35 41.1	–	V	T08
2019-12-07 14:33:14	C	10 57 58.66	+00 35 44.5	–	V	T08
2019-12-07 14:36:51	C	10 57 59.77	+00 36 02.6	–	V	T08
2019-12-07 14:37:31	C	10 58 00.04	+00 36 06.0	–	V	T08
2019-12-07 14:45:04	C	10 58 02.44	+00 36 44.0	–	V	T08
2019-12-07 14:45:43	C	10 58 02.68	+00 36 47.3	–	V	T08
2019-12-07 15:00:09	C	10 58 07.33	+00 38 00.0	–	V	T08
2019-12-07 15:00:50	C	10 58 07.51	+00 38 03.4	–	V	T08
2019-12-07 15:12:25	S	10 58 09.902	+00 39 16.42	–	L	C51
2019-12-07 18:20:33	S	10 59 12.067	+00 55 09.44	–	L	C51
2019-12-07 18:20:44	S	10 59 12.144	+00 55 10.99	–	L	C51
2019-12-07 21:28:52	S	11 00 14.921	+01 11 13.31	–	L	C51
2019-12-08 00:37:11	S	11 01 18.372	+01 27 27.04	–	L	C51
2019-12-08 03:45:30	S	11 02 22.450	+01 43 50.30	–	L	C51
2019-12-08 06:53:49	S	11 03 27.139	+02 00 23.33	–	L	C51
2019-12-08 13:10:27	S	11 05 38.460	+02 33 58.79	–	L	C51
2019-12-08 16:18:46	S	11 06 45.055	+02 51 01.55	–	L	C51
2019-12-08 19:26:54	S	11 07 52.267	+03 08 12.52	–	L	C51
2019-12-08 19:27:05	S	11 07 52.330	+03 08 13.88	–	L	C51
2019-12-08 22:35:13	S	11 09 00.202	+03 25 34.82	–	L	C51
2019-12-09 01:43:32	S	11 10 08.818	+03 43 07.00	–	L	C51
2019-12-09 04:51:51	S	11 11 18.108	+04 00 49.50	–	L	C51
2019-12-09 08:00:11	S	11 12 28.092	+04 18 41.54	–	L	C51
2019-12-09 11:08:29	S	11 13 38.774	+04 36 43.70	–	L	C51
2019-12-09 14:16:49	S	11 14 50.141	+04 54 55.87	–	L	C51
2019-12-09 14:47:59	C	11 15 03.72	+04 57 43.6	–	V	T05
2019-12-09 14:52:46	C	11 15 05.52	+04 58 11.5	–	V	T05
2019-12-09 15:01:07	C	11 15 08.64	+04 59 00.2	–	V	T05
2019-12-09 15:15:31	C	11 15 14.04	+05 00 24.5	–	V	T05
2019-12-09 17:24:57	S	11 16 02.170	+05 13 16.36	–	L	C51
2019-12-09 20:33:16	S	11 17 14.978	+05 31 48.29	–	L	C51
2019-12-09 23:41:35	S	11 18 28.519	+05 50 30.30	–	L	C51
2019-12-10 02:49:54	S	11 19 42.790	+06 09 22.14	–	L	C51
2019-12-10 05:58:13	S	11 20 57.806	+06 28 23.95	–	L	C51
2019-12-10 09:06:21	S	11 22 13.502	+06 47 33.65	–	L	C51
2019-12-10 12:14:40	S	11 23 30.050	+07 06 54.61	–	L	C51
2019-12-10 14:24:17	C	11 24 25.09	+07 20 06.6	–	V	T05
2019-12-10 14:29:04	C	11 24 27.04	+07 20 36.3	–	V	T05
2019-12-10 14:43:22	C	11 24 32.82	+07 22 05.6	–	V	T05
2019-12-10 14:53:59	C	11 24 37.11	+07 23 11.8	–	V	T05
2019-12-10 15:22:59	S	11 24 47.338	+07 26 25.73	–	L	C51

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2102 Tantalus (1975 YA)