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
2023-07-08 21:45:12	S	22 21 39.569	-77 46 05.12	–	V	C57
2023-07-08 21:45:12	s	1 +109075.39	3 +330033.81	1860.0	–	C57
2023-07-08 22:05:12	S	22 21 36.934	-77 46 52.61	–	V	C57
2023-07-08 22:05:12	s	1 +108326.57	3 +330172.77	9560.0	–	C57
2023-07-08 23:25:12	S	22 21 29.969	-77 50 07.91	–	V	C57
2023-07-08 23:25:12	s	1 +105316.15	6 +330683.30	320.0	–	C57
2023-07-09 00:25:12	S	22 21 23.950	-77 52 34.50	–	V	C57
2023-07-09 00:25:12	s	1 +103042.72	0 +331018.46	9780.0	–	C57
2023-07-09 00:45:12	S	22 21 22.824	-77 53 17.45	–	V	C57
2023-07-09 00:45:12	s	1 +102281.97	6 +331121.05	3180.0	–	C57
2023-07-09 01:25:12	S	22 21 18.816	-77 54 51.70	–	V	C57
2023-07-09 01:25:12	s	1 +100756.15	5 +331312.49	5900.0	–	C57
2023-07-09 01:45:12	S	22 21 17.201	-77 55 40.22	–	V	C57
2023-07-09 01:45:12	s	1 +99991.089	0 +331401.32	5390.0	–	C57
2023-07-09 02:05:12	S	22 21 14.712	-77 56 31.34	–	V	C57
2023-07-09 02:05:12	s	1 +99224.605	0 +331485.56	3750.0	–	C57
2023-07-09 02:25:12	S	22 21 12.871	-77 57 17.14	–	V	C57
2023-07-09 02:25:12	s	1 +98456.702	0 +331565.18	1070.0	–	C57
2023-07-09 02:45:12	S	22 21 11.369	-77 58 04.40	–	V	C57
2023-07-09 02:45:12	s	1 +97687.393	0 +331640.19	7440.0	–	C57
2023-07-09 03:05:12	S	22 21 09.989	-77 58 58.37	–	V	C57
2023-07-09 03:05:12	s	1 +96916.694	0 +331710.60	2950.0	–	C57
2023-07-09 04:05:12	S	22 21 03.703	-78 01 19.70	–	V	C57
2023-07-09 04:05:12	s	1 +94596.300	0 +331893.98	5190.0	–	C57
2023-07-09 04:25:12	S	22 21 01.361	-78 02 07.12	–	V	C57
2023-07-09 04:25:12	s	1 +93820.101	0 +331945.81	8150.0	–	C57
2023-07-09 05:05:12	S	22 20 58.390	-78 03 40.25	–	V	C57
2023-07-09 05:05:12	s	1 +92263.667	0 +332035.50	2910.0	–	C57
2023-07-09 06:25:12	S	22 20 50.645	-78 06 56.23	–	V	C57
2023-07-09 06:25:12	s	1 +89134.877	0 +332158.74	9590.0	–	C57
2023-07-09 06:45:12	S	22 20 48.982	-78 07 42.96	–	V	C57
2023-07-09 06:45:12	s	1 +88349.417	0 +332177.80	7610.0	–	C57
2023-07-09 07:25:12	S	22 20 45.862	-78 09 14.33	–	V	C57
2023-07-09 07:25:12	s	1 +86774.652	0 +332201.81	2860.0	–	C57
2023-07-09 08:25:12	S	22 20 37.946	-78 11 40.92	–	V	C57
2023-07-09 08:25:12	s	1 +84403.021	0 +332202.34	2400.0	–	C57
2023-07-09 09:25:12	S	22 20 33.768	-78 14 04.16	–	V	C57
2023-07-09 09:25:12	s	1 +82020.238	0 +332160.12	5680.0	–	C57
2023-07-09 10:05:12	S	22 20 29.844	-78 15 40.07	–	V	C57
2023-07-09 10:05:12	s	1 +80425.649	0 +332108.13	9800.0	–	C57
2023-07-09 11:05:12	S	22 20 23.198	-78 18 04.14	–	V	C57
2023-07-09 11:05:12	s	1 +78024.853	0 +331994.19	6970.0	–	C57
2023-07-09 11:25:12	S	22 20 22.181	-78 18 51.30	–	V	C57
2023-07-09 11:25:12	s	1 +77222.248	0 +331946.58	3240.0	–	C57
2023-07-09 11:45:12	S	22 20 19.514	-78 19 38.93	–	V	C57
2023-07-09 11:45:12	s	1 +76418.492	0 +331894.16	7950.0	–	C57
2023-07-09 12:05:12	S	22 20 17.686	-78 20 24.72	–	V	C57
2023-07-09 12:05:12	s	1 +75613.597	0 +331836.93	1020.0	–	C57
2023-07-09 13:25:12	S	22 20 10.248	-78 23 32.50	–	V	C57
2023-07-09 13:25:12	s	1 +72382.775	0 +331559.47	4780.0	–	C57

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2102 Tantalus (1975 YA)