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
2016-12-30 19:40:58 C 02 34 13.52 -09 07 59.4 q G33
2016-12-30 22:07:18 C 02 32 11.14 -08 30 21.0 t 510
2016-12-30 22:11:28 C 02 32 07.67 -08 29 16.7 t 510
2016-12-30 22:14:45 C 02 32 04.94 -08 28 26.0 t 510
2016-12-30 22:18:19 C 02 32 01.96 -08 27 30.9 t 510
2016-12-30 22:21:54 C 02 31 58.99 -08 26 35.6 t 510
2016-12-30 22:25:28 C 02 31 56.01 -08 25 40.3 t 510
2016-12-30 22:29:03 C 02 31 53.07 -08 24 45.1 t 510
2016-12-30 22:32:37 C 02 31 50.09 -08 23 50.0 t 510
2016-12-30 22:36:12 C 02 31 47.10 -08 22 54.8 t 510
2016-12-30 22:39:29 C 02 31 44.38 -08 22 03.8 t 510
2016-12-30 22:43:03 C 02 31 41.41 -08 21 08.6 t 510
2016-12-30 22:46:20 C 02 31 38.69 -08 20 18.0 t 510
2016-12-30 22:49:54 C 02 31 35.73 -08 19 22.7 t 510
2016-12-31 22:05:10 C 02 12 56.90 -02 23 24.6 q 160
2016-12-31 22:06:59 C 02 12 55.45 -02 22 57.1 q 160
2016-12-31 22:08:47 C 02 12 54.05 -02 22 29.9 q 160
2017-01-02 07:09:10 S 01 48 18.569 +05 35 23.82 L C51
2017-01-02 08:43:36 S 01 47 11.573 +05 56 52.94 L C51
2017-01-02 11:52:28 S 01 44 58.522 +06 39 26.60 L C51
2017-01-02 11:52:39 S 01 44 58.406 +06 39 28.30 L C51
2017-01-02 17:48:43 C 01 40 52.08 +07 57 33.5 q Z52
2017-01-02 18:54:35 C 01 40 06.19 +08 11 54.8 q Z52
2017-01-02 19:59:38 C 01 39 21.02 +08 26 00.6 q Z52
2017-01-02 20:46:44 C 01 38 48.44 +08 36 10.1 q Z52
2017-01-03 06:22:52 C 01 32 22.13 +10 38 03.6 L T05
2017-01-03 06:26:29 C 01 32 19.68 +10 38 48.6 L T05
2017-01-03 06:42:46 C 01 32 08.70 +10 42 09.1 L T05
2017-01-03 06:46:12 C 01 32 06.39 +10 42 51.4 L T05
2017-01-03 07:07:21 C 01 31 52.17 +10 47 11.5 L T05
2017-01-03 07:24:03 C 01 31 40.96 +10 50 36.3 L T05
2017-01-03 07:28:18 C 01 31 38.10 +10 51 28.7 L T05
2017-01-03 07:45:31 C 01 31 26.58 +10 54 59.4 L T05
2017-01-03 21:16:43 C 01 22 45.98 +13 34 54.5 q 160
2017-01-03 21:18:44 C 01 22 44.69 +13 35 17.7 q 160
2017-01-03 21:20:56 C 01 22 43.32 +13 35 41.6 q 160
2017-01-04 06:19:29 C 01 17 11.82 +15 16 12.0 L T05
2017-01-04 06:24:22 C 01 17 08.78 +15 17 05.0 L T05
2017-01-04 06:47:02 C 01 16 54.72 +15 21 10.5 L T05
2017-01-04 07:18:49 C 01 16 35.07 +15 26 53.5 L T05
2017-01-04 18:53:58 C 01 09 44.72 +17 27 40.2 q Z52
2017-01-04 22:05:45 C 01 07 52.55 +17 59 36.4 q Z52
2017-01-04 22:26:40 C 01 07 40.45 +18 03 02.8 q Z52
2017-01-05 01:47:46 C 01 05 46.78 +18 36 11.9 q H45
2017-01-05 01:48:39 C 01 05 46.27 +18 36 20.4 q H45
2017-01-05 01:49:28 C 01 05 45.80 +18 36 28.2 q H45
2017-01-05 01:50:13 C 01 05 45.37 +18 36 35.3 q H45
2017-01-05 01:50:57 C 01 05 44.94 +18 36 42.7 q H45
2017-01-05 01:51:46 C 01 05 44.47 +18 36 50.5 q H45
2017-01-05 01:52:34 C 01 05 43.99 +18 36 58.4 q H45
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)