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
2013-12-22 01:09:20	C	03 30 42.837	-56 18 06.72	–	o	844
2014-01-03 20:02:57	S	02 28 38.021	-37 15 19.98	–	L	C51
2014-01-03 23:12:44	S	02 28 09.706	-37 00 48.82	–	L	C51
2014-01-04 02:22:42	S	02 27 41.498	-36 46 13.91	–	L	C51
2014-01-04 05:32:29	S	02 27 13.541	-36 31 37.74	–	L	C51
2014-01-04 08:42:16	S	02 26 45.74	-36 16 58.4	–	L	C51
2014-01-04 10:17:15	S	02 26 31.92	-36 09 37.8	–	L	C51
2014-01-04 11:52:03	S	02 26 18.13	-36 02 17.3	–	L	C51
2014-01-04 13:27:02	S	02 26 04.325	-35 54 54.90	–	L	C51
2014-01-04 15:01:50	S	02 25 50.67	-35 47 32.9	–	L	C51
2014-01-04 16:36:49	S	02 25 36.97	-35 40 09.6	–	L	C51
2014-01-04 18:11:48	S	02 25 23.32	-35 32 46.0	–	L	C51
2014-01-04 19:46:36	S	02 25 09.722	-35 25 22.30	–	L	C51
2014-01-04 21:21:35	S	02 24 56.186	-35 17 57.12	–	L	C51
2014-01-05 00:31:22	S	02 24 29.23	-35 03 05.6	–	L	C51
2014-01-05 01:44:44	C	02 24 18.02	-34 57 22.1	–	u	X14
2014-01-05 01:52:20	C	02 24 16.77	-34 56 45.1	–	o	844
2014-01-05 01:55:57	C	02 24 16.24	-34 56 27.7	–	o	844
2014-01-05 01:59:34	C	02 24 15.69	-34 56 10.5	–	o	844
2014-01-05 02:03:12	C	02 24 15.17	-34 55 53.4	–	o	844
2014-01-05 02:03:34	C	02 24 15.23	-34 55 54.2	–	u	X14
2014-01-05 02:06:21	S	02 24 15.83	-34 55 38.9	–	L	C51
2014-01-05 02:06:49	C	02 24 14.65	-34 55 36.0	–	o	844
2014-01-05 02:15:00	C	02 24 13.56	-34 54 59.1	–	u	X14
2014-01-05 03:41:10	S	02 24 02.42	-34 48 11.9	–	L	C51
2014-01-05 05:16:09	S	02 23 49.12	-34 40 43.8	–	L	C51
2014-01-05 08:25:56	S	02 23 22.541	-34 25 47.21	–	L	C51
2014-01-05 14:45:30	S	02 22 29.940	-33 55 46.49	–	L	C51
2014-01-08 15:31:39	S	02 13 09.449	-28 01 21.07	–	L	C51
2014-01-08 17:06:27	S	02 12 58.123	-27 53 29.83	–	L	C51
2014-01-08 17:06:38	S	02 12 58.109	-27 53 29.18	–	L	C51
2014-01-08 18:41:26	S	02 12 46.826	-27 45 37.73	–	L	C51
2014-01-08 20:16:25	S	02 12 35.551	-27 37 45.01	–	L	C51
2014-01-08 21:51:13	S	02 12 24.355	-27 29 53.23	–	L	C51
2014-01-08 23:26:12	S	02 12 13.140	-27 21 59.65	–	L	C51
2014-01-09 01:01:00	S	02 12 02.002	-27 14 07.30	–	L	C51
2014-01-09 01:01:11	S	02 12 02.02	-27 14 05.8	–	L	C51
2014-01-09 02:34:09	C	02 11 50.05	-27 06 18.7	16.6	u	I36
2014-01-09 02:35:59	S	02 11 50.88	-27 06 13.3	–	L	C51
2014-01-09 03:17:30	C	02 11 44.88	-27 02 41.2	16.5	u	I36
2014-01-09 03:55:16	C	02 11 40.41	-26 59 31.7	16.5	u	I36
2014-01-09 04:10:58	S	02 11 39.85	-26 58 20.5	–	L	C51
2014-01-09 07:20:45	S	02 11 17.75	-26 42 31.4	–	L	C51
2014-01-09 10:30:32	S	02 10 55.79	-26 26 42.4	–	L	C51
2014-01-09 13:40:19	S	02 10 33.99	-26 10 52.5	–	L	C51
2014-01-09 16:50:06	S	02 10 12.288	-25 55 01.20	–	L	C51
2014-01-13 01:28:34	C	02 01 40.53	-19 07 29.6	16.5	u	I36
2014-01-13 01:51:32	C	02 01 38.21	-19 05 32.8	16.6	u	I36
2014-01-13 02:13:54	C	02 01 35.99	-19 03 39.3	16.5	u	I36
2014-01-23 23:47:30	C	01 41 01.88	+01 56 27.4	–	q	I15

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2102 Tantalus (1975 YA)