IAA RAS IAA Minor Planet Database

2102 Tantalus (1975 YA)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar ⇩ Gaia
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 Period1.46526223 yr ± 4.88e-10
Physical Parameters
H (abs. magnitude)16.00
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.249″
Uncertainty0
Orbit TypeApollo
MOID0.042239 AU
Observations Used1824
Radar Obs Used1
Gaia Obs Used127
Oppositions13
Arc Total1976-2026
First Observation Used1976-01-04
Last Observation Used2026-04-05
Observations (2255)
Date Type RA Dec Mag Band Observatory
2023-07-17 08:18:32 s 1 +168784.09 2 -49542.465 0.184 – C57
2023-07-17 08:58:31 S 21 27 25.670 -85 08 46.46 – V C57
2023-07-17 08:58:31 s 1 +170582.38 0 -46955.178 0.865 – C57
2023-07-17 09:38:31 S 21 26 51.432 -85 09 58.97 – V C57
2023-07-17 09:38:31 s 1 +172349.18 8 -44359.388 0.984 – C57
2023-07-17 09:58:31 S 21 26 35.995 -85 10 39.58 – V C57
2023-07-17 09:58:31 s 1 +173220.87 6 -43058.504 0.826 – C57
2023-07-17 10:18:31 S 21 26 19.812 -85 11 06.76 – V C57
2023-07-17 10:18:31 s 1 +174084.79 4 -41755.730 0.911 – C57
2023-07-17 10:38:32 S 21 26 02.201 -85 11 42.65 – V C57
2023-07-17 10:38:32 s 1 +174940.84 4 -40451.109 0.171 – C57
2023-07-17 10:58:32 S 21 25 46.541 -85 12 16.74 – V C57
2023-07-17 10:58:32 s 1 +175789.23 8 -39144.760 0.804 – C57
2023-07-17 11:18:31 S 21 25 31.080 -85 12 53.35 – V C57
2023-07-17 11:18:31 s 1 +176629.94 7 -37836.741 0.799 – C57
2023-07-17 15:18:31 S 21 22 10.241 -85 19 43.57 – V C57
2023-07-17 15:18:31 s 1 +186128.57 3 -22038.509 0.958 – C57
2023-07-17 15:38:31 S 21 21 58.409 -85 20 14.60 – V C57
2023-07-17 15:38:31 s 1 +186871.61 3 -20714.842 0.846 – C57
2023-07-17 15:58:31 S 21 21 39.840 -85 20 42.76 – V C57
2023-07-17 15:58:31 s 1 +187607.42 4 -19390.415 0.673 – C57
2023-07-17 16:18:31 S 21 21 15.869 -85 21 23.98 – V C57
2023-07-17 16:18:31 s 1 +188335.98 1 -18065.280 0.43 – C57
2023-07-17 16:38:32 S 21 21 02.170 -85 22 00.55 – V C57
2023-07-17 16:38:32 s 1 +189057.19 5 -16739.484 0.053 – C57
2023-07-17 16:58:31 S 21 20 46.956 -85 22 26.40 – V C57
2023-07-17 16:58:31 s 1 +189771.26 7 -15413.097 0.722 – C57
2023-07-17 17:18:31 S 21 20 31.493 -85 23 05.35 – V C57
2023-07-17 17:18:31 s 1 +190478.17 2 -14086.170 0.429 – C57
2023-07-17 17:38:31 S 21 20 14.700 -85 23 38.15 – V C57
2023-07-17 17:38:31 s 1 +191177.82 1 -12758.749 0.112 – C57
2023-07-17 17:58:31 S 21 19 53.165 -85 24 10.87 – V C57
2023-07-17 17:58:31 s 1 +191870.41 4 -11430.899 0.948 – C57
2023-07-17 18:18:31 S 21 19 38.124 -85 24 46.58 – V C57
2023-07-17 18:18:31 s 1 +192555.92 6 -10102.669 0.928 – C57
2023-07-17 18:38:31 S 21 19 24.326 -85 25 19.09 – V C57
2023-07-17 18:38:31 s 1 +193234.27 1 - 8774.107 0.991 – C57
2023-07-17 18:58:31 S 21 19 01.918 -85 25 50.59 – V C57
2023-07-17 18:58:31 s 1 +193905.64 5 - 7445.270 0.312 – C57
2023-07-17 19:18:31 S 21 18 44.748 -85 26 22.92 – V C57
2023-07-17 19:18:31 s 1 +194570.02 4 - 6116.206 0.88 – C57
2023-07-17 19:38:32 S 21 18 29.078 -85 26 58.16 – V C57
2023-07-17 19:38:32 s 1 +195227.32 4 - 4786.963 0.638 – C57
2023-07-17 19:58:31 S 21 18 08.422 -85 27 34.42 – V C57
2023-07-17 19:58:31 s 1 +195877.73 8 - 3457.593 0.755 – C57
2023-07-17 20:18:31 S 21 17 53.412 -85 28 04.51 – V C57
2023-07-17 20:18:31 s 1 +196521.24 2 - 2128.143 0.224 – C57
2023-07-17 20:38:31 S 21 17 34.860 -85 28 37.52 – V C57
2023-07-17 20:38:31 s 1 +197157.75 4 - 798.661 0.985 – C57
2023-07-17 20:58:31 S 21 17 17.806 -85 29 11.83 – V C57
Radar Observations (1)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2017-01-04 22:03:00 169565888.79 4 us 2380 -1 -1
Station codes
-1 Arecibo (305-m, 1963–2020)