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
2023-07-16 08:58:32 s 1 +84756.293 0 -128169.95 3630.0 – C57
2023-07-16 09:18:32 S 21 43 43.800 -84 25 18.37 – V C57
2023-07-16 09:18:32 s 1 +86249.788 0 -127322.67 6890.0 – C57
2023-07-16 09:38:32 S 21 43 33.113 -84 25 55.45 – V C57
2023-07-16 09:38:32 s 1 +87735.080 0 -126463.32 6190.0 – C57
2023-07-16 10:38:32 S 21 42 55.630 -84 27 51.30 – V C57
2023-07-16 10:38:32 s 1 +92142.098 0 -123816.09 0.068 – C57
2023-07-16 10:58:32 S 21 42 41.849 -84 28 30.54 – V C57
2023-07-16 10:58:32 s 1 +93594.622 0 -122911.24 0.083 – C57
2023-07-16 11:18:32 S 21 42 31.680 -84 29 07.80 – V C57
2023-07-16 11:18:32 s 1 +95038.852 0 -121995.52 0.9 – C57
2023-07-16 11:38:32 S 21 42 18.972 -84 29 42.79 – V C57
2023-07-16 11:38:32 s 1 +96474.611 0 -121068.96 0.381 – C57
2023-07-16 11:58:32 S 21 42 07.826 -84 30 25.24 – V C57
2023-07-16 11:58:32 s 1 +97902.065 0 -120132.01 0.761 – C57
2023-07-16 12:18:32 S 21 41 54.883 -84 31 04.51 – V C57
2023-07-16 12:18:32 s 1 +99321.118 0 -119184.78 0.988 – C57
2023-07-16 12:38:31 S 21 41 44.914 -84 31 41.95 – V C57
2023-07-16 12:38:31 s 1 +100731.60 1 -118227.29 0.931 – C57
2023-07-16 12:58:31 S 21 41 30.571 -84 32 26.27 – V C57
2023-07-16 12:58:31 s 1 +102133.68 7 -117259.98 0.826 – C57
2023-07-16 13:38:32 S 21 41 05.328 -84 33 36.29 – V C57
2023-07-16 13:38:32 s 1 +104912.24 0 -115296.25 0.205 – C57
2023-07-16 14:38:32 S 21 40 26.921 -84 35 29.22 – V C57
2023-07-16 14:38:32 s 1 +109015.87 4 -112280.84 0.796 – C57
2023-07-16 15:18:32 S 21 40 02.899 -84 36 48.31 – V C57
2023-07-16 15:18:32 s 1 +111708.66 9 -110226.14 0.879 – C57
2023-07-16 15:38:31 S 21 39 49.656 -84 37 23.45 – V C57
2023-07-16 15:38:31 s 1 +113042.01 0 -109185.87 0.382 – C57
2023-07-16 15:58:31 S 21 39 35.849 -84 37 59.70 – V C57
2023-07-16 15:58:31 s 1 +114366.79 1 -108137.36 0.061 – C57
2023-07-16 16:38:32 S 21 39 09.900 -84 39 16.92 – V C57
2023-07-16 16:38:32 s 1 +116990.30 2 -106015.99 0.723 – C57
2023-07-16 17:18:32 S 21 38 41.765 -84 40 31.80 – V C57
2023-07-16 17:18:32 s 1 +119579.20 8 -103863.38 0.179 – C57
2023-07-16 17:58:32 S 21 38 14.702 -84 41 46.68 – V C57
2023-07-16 17:58:32 s 1 +122133.26 9 -101680.64 0.481 – C57
2023-07-16 18:18:31 S 21 38 05.251 -84 42 28.76 – V C57
2023-07-16 18:18:31 s 1 +123397.34 4 -100578.46 0.648 – C57
2023-07-16 18:38:31 S 21 37 50.076 -84 42 58.93 – V C57
2023-07-16 18:38:31 s 1 +124652.61 7 -99469.146 0.042 – C57
2023-07-16 18:58:31 S 21 37 34.925 -84 43 39.65 – V C57
2023-07-16 18:58:31 s 1 +125899.29 9 -98353.005 0.904 – C57
2023-07-16 19:18:31 S 21 37 23.741 -84 44 13.78 – V C57
2023-07-16 19:18:31 s 1 +127137.32 7 -97230.139 0.205 – C57
2023-07-16 19:38:32 S 21 37 08.657 -84 44 51.29 – V C57
2023-07-16 19:38:32 s 1 +128366.56 4 -96100.585 0.843 – C57
2023-07-16 19:58:32 S 21 36 53.412 -84 45 31.93 – V C57
2023-07-16 19:58:32 s 1 +129587.22 2 -94964.645 0.057 – C57
2023-07-16 20:18:32 S 21 36 40.202 -84 46 07.72 – 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)