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
2004-04-23 17:33:43 C 21 28 06.95 -15 24 26.0 r E12
2004-04-23 17:48:33 C 21 28 08.16 -15 24 42.5 r E12
2004-04-23 18:03:20 C 21 28 09.18 -15 24 58.4 r E12
2004-04-23 18:18:10 C 21 28 10.33 -15 25 16.0 r E12
2004-06-20 08:21:52 C 23 43 10.67 -59 13 05.0 r 859
2004-06-20 08:24:04 C 23 43 11.06 -59 13 11.6 r 859
2004-06-20 08:26:17 C 23 43 11.35 -59 13 16.8 r 859
2004-06-26 07:33:16 C 00 06 46.99 -64 55 15.8 r 859
2004-06-26 07:35:36 C 00 06 47.30 -64 55 21.0 r 859
2004-06-26 07:37:57 C 00 06 47.73 -64 55 26.6 r 859
2004-08-21 16:33:01 C 10 12 04.97 -79 56 43.4 r E17
2004-08-21 16:56:13 C 10 12 10.06 -79 56 37.4 r E17
2004-08-21 17:19:13 C 10 12 15.50 -79 56 31.3 r E17
2007-05-27 19:04:42 C 23 31 24.63 -42 55 26.4 r E12
2007-05-27 19:19:20 C 23 31 26.68 -42 55 48.5 r E12
2007-05-27 19:33:38 C 23 31 28.70 -42 56 09.4 r E12
2007-05-27 19:48:19 C 23 31 30.75 -42 56 32.8 r E12
2007-06-23 18:18:15 C 01 26 57.19 -59 09 01.1 r E12
2007-06-23 18:33:46 C 01 27 00.64 -59 09 23.2 r E12
2007-06-23 18:49:06 C 01 27 03.99 -59 09 43.8 r E12
2007-06-23 19:04:26 C 01 27 07.38 -59 10 05.5 r E12
2007-12-31 12:27:31 C 01 17 09.31 -58 16 44.5 r E12
2007-12-31 12:40:24 C 01 17 09.85 -58 16 17.5 r E12
2007-12-31 12:53:15 C 01 17 10.42 -58 15 49.3 r E12
2008-01-13 10:37:47 C 01 31 27.61 -46 39 01.3 r 432
2008-01-13 11:16:22 C 01 31 29.40 -46 37 28.6 r 432
2008-01-13 11:55:05 C 01 31 31.21 -46 35 57.3 r 432
2008-02-10 10:46:48 C 02 07 23.05 -18 33 30.8 r E12
2008-02-10 10:51:16 C 02 07 23.30 -18 33 19.2 r E12
2008-02-10 10:55:45 C 02 07 23.52 -18 33 06.9 r E12
2008-02-10 11:00:15 C 02 07 23.80 -18 32 55.8 r E12
2008-07-29 03:56:21 C 13 43 22.47 +26 00 35.5 r 703
2008-07-29 04:04:02 C 13 43 23.44 +26 00 09.8 r 703
2008-07-29 04:11:49 C 13 43 24.31 +25 59 44.4 r 703
2008-07-29 04:19:31 C 13 43 25.28 +25 59 19.1 r 703
2010-06-16 00:08:31 S 01 52 24.941 -51 52 21.97 L C51
2010-06-16 06:29:33 S 01 53 40.524 -51 57 19.15 L C51
2010-06-16 06:29:44 S 01 53 40.577 -51 57 19.55 L C51
2010-06-16 12:50:46 S 01 54 56.29 -52 02 15.2 L C51
2010-06-16 16:01:17 S 01 55 34.21 -52 04 43.5 L C51
2010-06-16 19:11:49 S 01 56 12.06 -52 07 10.8 L C51
2010-06-16 22:22:20 S 01 56 50.04 -52 09 38.3 L C51
2010-06-17 04:43:22 S 01 58 06.09 -52 14 30.4 L C51
2010-06-17 06:18:43 S 01 58 25.13 -52 15 43.7 L C51
2010-06-17 07:53:53 S 01 58 44.10 -52 16 56.7 L C51
2010-06-17 12:39:45 S 01 59 41.21 -52 20 35.5 L C51
2010-06-17 14:14:55 S 02 00 00.24 -52 21 47.8 L C51
2010-06-17 19:00:47 S 02 00 57.54 -52 25 25.2 L C51
2010-06-17 20:35:57 S 02 01 16.54 -52 26 37.1 L C51
2010-06-17 22:11:18 S 02 01 35.71 -52 27 49.2 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)