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
2016-11-20 02:43:33 S 08 12 43.428 -47 47 14.57 L C51
2016-11-20 05:52:14 S 08 12 37.39 -47 48 18.1 L C51
2016-11-20 09:00:55 S 08 12 31.28 -47 49 20.5 L C51
2016-11-21 18:01:50 S 08 11 20.90 -48 00 20.1 L C51
2016-11-21 19:36:05 S 08 11 17.28 -48 00 52.1 L C51
2016-11-21 21:10:20 S 08 11 13.61 -48 01 23.2 L C51
2016-11-21 21:10:31 S 08 11 13.59 -48 01 23.0 L C51
2016-11-21 22:44:46 S 08 11 09.92 -48 01 54.1 L C51
2016-11-22 00:19:01 S 08 11 06.274 -48 02 26.23 L C51
2016-11-22 01:53:27 S 08 11 02.438 -48 02 56.51 L C51
2016-11-22 05:02:08 S 08 10 54.84 -48 03 59.9 L C51
2016-11-22 06:36:23 S 08 10 51.02 -48 04 30.7 L C51
2016-11-22 08:10:39 S 08 10 47.16 -48 05 02.3 L C51
2016-11-22 09:45:05 S 08 10 43.26 -48 05 33.6 L C51
2016-11-22 11:19:20 S 08 10 39.31 -48 06 04.8 L C51
2016-11-22 12:53:46 S 08 10 35.37 -48 06 36.2 L C51
2016-11-22 14:28:00 S 08 10 31.457 -48 07 07.50 L C51
2016-11-22 16:02:15 S 08 10 27.39 -48 07 38.7 L C51
2016-11-22 16:02:27 S 08 10 27.41 -48 07 38.9 L C51
2016-11-22 17:36:41 S 08 10 23.263 -48 08 09.82 L C51
2016-11-22 20:45:23 S 08 10 15.274 -48 09 13.10 L C51
2016-11-22 23:54:04 S 08 10 06.95 -48 10 14.8 L C51
2016-12-07 23:11:11 C 07 35 00.21 -49 47 04.6 t K91
2016-12-07 23:32:02 C 07 34 56.35 -49 47 07.6 t K91
2016-12-08 00:01:14 C 07 34 50.93 -49 47 11.1 t K91
2016-12-08 00:24:15 C 07 34 46.62 -49 47 13.8 t K91
2016-12-08 00:45:07 C 07 34 42.71 -49 47 16.3 t K91
2016-12-08 01:10:10 C 07 34 38.01 -49 47 19.2 t K91
2016-12-08 01:31:08 C 07 34 34.08 -49 47 21.2 t K91
2016-12-08 01:56:12 C 07 34 29.37 -49 47 23.6 t K91
2016-12-17 03:42:54 C 06 32 22.90 -48 37 18.2 q W88
2016-12-17 06:00:31 C 06 31 22.08 -48 34 43.6 q W88
2016-12-17 07:22:55 C 06 30 45.39 -48 33 05.6 q W88
2016-12-28 21:18:33 n 03 13 58.00 -20 40 05.1 q 619
2016-12-28 21:25:15 n 03 13 52.00 -20 38 31.1 q 619
2016-12-28 21:40:07 n 03 13 38.76 -20 35 02.0 q 619
2016-12-28 21:47:41 n 03 13 32.00 -20 33 15.7 q 619
2016-12-30 18:36:41 C 02 35 07.60 -09 24 29.8 q C23
2016-12-30 18:44:02 C 02 35 01.45 -09 22 36.7 q C23
2016-12-30 18:51:21 C 02 34 55.28 -09 20 43.9 q C23
2016-12-30 18:58:42 C 02 34 49.11 -09 18 50.5 q C23
2016-12-30 19:06:02 C 02 34 42.95 -09 16 57.5 q C23
2016-12-30 19:07:05 C 02 34 42.02 -09 16 42.9 q G33
2016-12-30 19:11:06 C 02 34 38.60 -09 15 39.7 q G33
2016-12-30 19:13:22 C 02 34 36.77 -09 15 04.2 q C23
2016-12-30 19:19:03 C 02 34 31.89 -09 13 37.3 q G33
2016-12-30 19:20:42 C 02 34 30.63 -09 13 11.2 q C23
2016-12-30 19:24:27 C 02 34 27.44 -09 12 13.0 q G33
2016-12-30 19:25:35 C 02 34 26.53 -09 11 56.2 q C23
2016-12-30 19:31:31 C 02 34 21.51 -09 10 25.3 q G33
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)