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
2019-12-10 18:31:18	S	11 26 05.426	+07 46 06.49	–	L	C51
2019-12-10 21:39:26	S	11 27 24.194	+08 05 54.92	–	L	C51
2019-12-10 21:39:37	S	11 27 24.293	+08 05 56.65	–	L	C51
2019-12-11 00:47:45	S	11 28 43.862	+08 25 54.80	–	L	C51
2019-12-11 03:56:04	S	11 30 04.310	+08 46 03.94	–	L	C51
2019-12-11 07:04:23	S	11 31 25.589	+09 06 22.68	–	L	C51
2019-12-11 10:12:31	S	11 32 47.599	+09 26 48.59	–	L	C51
2019-12-11 10:12:42	S	11 32 47.676	+09 26 50.39	–	L	C51
2019-12-11 13:20:50	S	11 34 10.507	+09 47 25.48	–	L	C51
2019-12-11 16:29:09	S	11 35 34.243	+10 08 11.36	–	L	C51
2019-12-12 13:03:47	C	11 45 07.02	+12 27 41.1	–	V	T08
2019-12-12 13:14:39	C	11 45 12.14	+12 28 56.6	–	V	T08
2019-12-12 13:32:17	C	11 45 20.47	+12 30 59.3	–	V	T08
2019-12-16 14:44:40	C	12 39 20.54	+24 25 16.8	–	V	T08
2019-12-16 14:48:48	C	12 39 23.15	+24 25 48.0	–	V	T08
2019-12-16 14:57:57	C	12 39 28.89	+24 26 56.3	–	V	T08
2019-12-16 15:16:12	C	12 39 40.35	+24 29 13.0	–	V	T08
2019-12-16 16:00:44	C	12 40 08.34	+24 34 46.2	–	V	T08
2019-12-20 13:14:24	C	13 46 01.31	+35 13 09.0	–	V	T08
2019-12-20 13:19:11	C	13 46 04.94	+35 13 37.7	–	V	T08
2019-12-20 13:26:36	C	13 46 10.57	+35 14 22.2	–	V	T08
2019-12-20 13:40:55	C	13 46 21.44	+35 15 48.0	–	V	T08
2019-12-30 00:28:50	C	16 30 54.52	+46 07 48.0	–	q	168
2019-12-30 01:08:50	C	16 31 17.83	+46 08 07.9	–	q	168
2019-12-30 01:56:50	C	16 31 45.76	+46 08 31.1	–	q	168
2019-12-30 02:52:50	C	16 32 18.13	+46 08 57.3	–	q	168
2020-03-03 15:23:55	C	20 15 33.48	+28 59 49.7	–	V	T05
2020-03-03 15:32:27	C	20 15 33.86	+28 59 44.7	–	V	T05
2020-03-03 15:37:49	C	20 15 34.12	+28 59 41.7	–	V	T05
2020-03-03 15:47:45	C	20 15 34.57	+28 59 35.1	–	V	T05
2020-03-09 14:36:06	C	20 22 05.48	+27 31 22.7	–	V	T08
2020-03-09 14:40:06	C	20 22 05.71	+27 31 21.0	–	V	T08
2020-03-09 14:50:00	C	20 22 06.10	+27 31 15.0	–	V	T08
2020-03-09 15:06:09	C	20 22 06.77	+27 31 05.1	–	V	T08
2020-03-25 14:49:43	C	20 38 28.97	+23 33 20.7	–	V	T08
2020-03-25 14:55:21	C	20 38 29.17	+23 33 17.7	–	V	T08
2020-03-25 15:06:11	C	20 38 29.63	+23 33 10.7	–	V	T08
2020-03-25 15:18:08	C	20 38 30.07	+23 33 03.1	–	V	T08
2020-03-25 15:32:58	C	20 38 30.58	+23 32 53.6	–	V	T08
2020-04-18 12:35:56	C	20 59 41.51	+16 48 57.1	–	V	T08
2020-04-18 12:41:12	C	20 59 41.69	+16 48 52.6	–	V	T08
2020-04-18 12:50:24	C	20 59 41.98	+16 48 45.5	–	V	T08
2020-04-18 13:04:55	C	20 59 42.43	+16 48 33.0	–	V	T08
2020-04-25 11:22:01	C	21 04 46.46	+14 21 18.0	–	V	G96
2020-04-25 11:28:51	C	21 04 46.63	+14 21 11.8	–	V	G96
2020-04-25 11:35:39	C	21 04 46.82	+14 21 04.9	–	V	G96
2020-04-25 11:42:29	C	21 04 47.00	+14 20 58.5	–	V	G96
2020-04-26 10:17:32	C	21 05 25.23	+13 59 10.4	–	V	703
2020-04-26 10:26:17	C	21 05 25.44	+13 59 02.7	–	V	703
2020-04-26 10:35:04	C	21 05 25.62	+13 58 53.5	–	V	703

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2102 Tantalus (1975 YA)