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
2014-07-16 02:28:35 C 15 13 18.63 -04 44 49.6 u H21
2014-07-16 02:31:06 C 15 13 18.50 -04 44 59.6 u H21
2014-07-16 21:19:36 C 15 12 25.85 -05 58 17.5 q 160
2014-07-16 21:22:33 C 15 12 25.71 -05 58 28.8 q 160
2014-07-16 21:25:33 C 15 12 25.57 -05 58 40.3 q 160
2014-07-18 03:12:06 C 15 11 10.06 -07 49 55.4 q H21
2014-07-18 03:15:20 C 15 11 09.92 -07 50 07.1 q H21
2014-07-18 03:18:32 C 15 11 09.79 -07 50 18.7 q H21
2014-07-18 03:21:45 C 15 11 09.64 -07 50 30.6 q H21
2014-07-18 03:24:58 C 15 11 09.50 -07 50 42.4 q H21
2014-07-19 02:21:08 C 15 10 17.42 -09 12 32.6 u H21
2014-07-19 02:26:36 C 15 10 17.21 -09 12 51.5 u H21
2014-07-19 02:31:09 C 15 10 17.03 -09 13 07.4 u H21
2014-07-19 02:33:46 C 15 10 16.92 -09 13 16.6 u H21
2014-07-25 06:23:23 C 15 06 29.427 -16 48 38.25 L F51
2014-07-25 06:38:39 C 15 06 29.131 -16 49 19.46 L F51
2014-07-25 07:09:06 C 15 06 28.543 -16 50 41.52 L F51
2014-07-27 21:16:12 C 15 05 42.70 -19 29 53.9 t J04
2014-07-27 21:18:22 C 15 05 42.68 -19 29 59.1 t J04
2014-07-27 21:20:32 C 15 05 42.65 -19 30 04.3 t J04
2014-07-27 21:23:48 C 15 05 42.62 -19 30 12.5 t J04
2014-08-14 04:49:28 S 15 09 44.24 -31 59 47.4 L C51
2014-08-14 07:58:53 S 15 09 48.93 -32 04 01.3 L C51
2014-08-14 15:52:31 S 15 10 01.05 -32 14 31.2 L C51
2014-08-14 17:27:08 S 15 10 03.44 -32 16 37.0 L C51
2014-08-14 23:45:58 S 15 10 13.29 -32 24 56.7 L C51
2014-08-14 23:46:08 S 15 10 13.33 -32 24 57.3 L C51
2014-08-15 04:30:11 S 15 10 20.81 -32 31 10.0 L C51
2014-08-15 10:49:01 S 15 10 30.99 -32 39 22.1 L C51
2014-08-15 13:58:26 S 15 10 36.12 -32 43 28.1 L C51
2016-10-20 16:53:04 C 08 07 31.73 -44 01 35.8 q Q60
2016-10-20 17:06:50 C 08 07 32.17 -44 01 39.6 q Q60
2016-10-20 17:20:46 C 08 07 32.64 -44 01 44.0 q Q60
2016-11-19 00:00:00 S 08 13 30.65 -47 38 20.3 L C51
2016-11-19 03:08:41 S 08 13 25.438 -47 39 23.33 L C51
2016-11-19 04:42:56 S 08 13 22.82 -47 39 54.2 L C51
2016-11-19 04:43:07 S 08 13 22.81 -47 39 54.8 L C51
2016-11-19 06:17:22 S 08 13 20.17 -47 40 25.9 L C51
2016-11-19 07:51:37 S 08 13 17.378 -47 40 57.58 L C51
2016-11-19 09:26:03 S 08 13 14.76 -47 41 28.9 L C51
2016-11-19 11:00:18 S 08 13 12.05 -47 41 59.5 L C51
2016-11-19 12:34:44 S 08 13 09.30 -47 42 31.7 L C51
2016-11-19 14:08:59 S 08 13 06.51 -47 43 03.5 L C51
2016-11-19 15:43:15 S 08 13 03.71 -47 43 34.9 L C51
2016-11-19 17:17:41 S 08 13 00.90 -47 44 06.0 L C51
2016-11-19 18:51:56 S 08 12 58.003 -47 44 37.50 L C51
2016-11-19 20:26:22 S 08 12 55.18 -47 45 09.0 L C51
2016-11-19 22:00:37 S 08 12 52.25 -47 45 40.2 L C51
2016-11-19 23:34:52 S 08 12 49.33 -47 46 12.3 L C51
2016-11-20 01:09:18 S 08 12 46.363 -47 46 43.07 L C51
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)