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
2023-07-09 14:05:12	S	22 20 06.545	-78 25 13.91	–	V	C57
2023-07-09 14:05:12	s	1 +70760.768	0 +331391.56	9200.0	–	C57
2023-07-09 14:25:12	S	22 20 04.303	-78 26 00.24	–	V	C57
2023-07-09 14:25:12	s	1 +69948.148	0 +331300.27	7940.0	–	C57
2023-07-09 15:25:12	S	22 19 58.462	-78 28 18.98	–	V	C57
2023-07-09 15:25:12	s	1 +67503.955	0 +330997.00	9100.0	–	C57
2023-07-09 15:45:12	S	22 19 55.961	-78 29 03.41	–	V	C57
2023-07-09 15:45:12	s	1 +66687.144	0 +330886.07	7460.0	–	C57
2023-07-09 16:45:12	S	22 19 50.971	-78 31 33.28	–	V	C57
2023-07-09 16:45:12	s	1 +64230.625	0 +330523.70	5040.0	–	C57
2023-07-09 17:05:12	S	22 19 48.084	-78 32 20.22	–	V	C57
2023-07-09 17:05:12	s	1 +63409.793	0 +330393.02	1400.0	–	C57
2023-07-09 17:25:12	S	22 19 46.306	-78 33 03.49	–	V	C57
2023-07-09 17:25:12	s	1 +62587.976	0 +330257.36	4480.0	–	C57
2023-07-09 17:45:12	S	22 19 44.808	-78 33 54.32	–	V	C57
2023-07-09 17:45:12	s	1 +61765.189	0 +330116.72	4200.0	–	C57
2023-07-09 18:05:12	S	22 19 41.854	-78 34 43.79	–	V	C57
2023-07-09 18:05:12	s	1 +60941.446	0 +329971.13	460.0	–	C57
2023-07-09 18:25:12	S	22 19 40.814	-78 35 25.48	–	V	C57
2023-07-09 18:25:12	s	1 +60116.751	0 +329820.52	3140.0	–	C57
2023-07-09 18:45:12	S	22 19 38.424	-78 36 16.49	–	V	C57
2023-07-09 18:45:12	s	1 +59291.117	0 +329664.91	2130.0	–	C57
2023-07-09 19:45:12	S	22 19 33.384	-78 38 36.78	–	V	C57
2023-07-09 19:45:12	s	1 +56808.699	0 +329168.03	5980.0	–	C57
2023-07-09 20:05:12	S	22 19 29.942	-78 39 25.85	–	V	C57
2023-07-09 20:05:12	s	1 +55979.423	0 +328992.36	9210.0	–	C57
2023-07-09 21:25:12	S	22 19 22.788	-78 42 28.30	–	V	C57
2023-07-09 21:25:12	s	1 +52653.580	0 +328239.09	8820.0	–	C57
2023-07-09 21:45:12	S	22 19 18.050	-78 43 18.88	–	V	C57
2023-07-09 21:45:12	s	1 +51819.990	0 +328038.09	9870.0	–	C57
2023-07-09 22:05:12	S	22 19 17.818	-78 44 06.14	–	V	C57
2023-07-09 22:05:12	s	1 +50985.574	0 +327832.02	6170.0	–	C57
2023-07-09 22:25:12	S	22 19 14.962	-78 44 58.31	–	V	C57
2023-07-09 22:25:12	s	1 +50150.338	0 +327620.83	7580.0	–	C57
2023-07-09 22:45:12	S	22 19 12.965	-78 45 39.38	–	V	C57
2023-07-09 22:45:12	s	1 +49314.295	0 +327404.53	4010.0	–	C57
2023-07-09 23:45:12	S	22 19 06.950	-78 47 59.39	–	V	C57
2023-07-09 23:45:12	s	1 +46801.444	0 +326724.93	2270.0	–	C57
2023-07-10 02:05:12	S	22 18 52.466	-78 53 36.10	–	V	C57
2023-07-10 02:05:12	s	1 +40912.043	0 +324958.69	9300.0	–	C57
2023-07-10 02:45:12	S	22 18 47.827	-78 55 06.78	–	V	C57
2023-07-10 02:45:12	s	1 +39223.071	0 +324407.28	1090.0	–	C57
2023-07-10 03:05:12	S	22 18 45.134	-78 55 49.01	–	V	C57
2023-07-10 03:05:12	s	1 +38377.599	0 +324123.75	2350.0	–	C57
2023-07-10 03:25:12	S	22 18 43.620	-78 56 40.63	–	V	C57
2023-07-10 03:25:12	s	1 +37531.483	0 +323834.96	6970.0	–	C57
2023-07-10 03:45:12	S	22 18 41.551	-78 57 25.99	–	V	C57
2023-07-10 03:45:12	s	1 +36684.737	0 +323540.92	4870.0	–	C57
2023-07-10 06:25:12	S	22 18 24.926	-79 03 38.63	–	V	C57
2023-07-10 06:25:12	s	1 +29889.581	0 +320998.49	1400.0	–	C57

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2102 Tantalus (1975 YA)