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
1995-01-15 10:14:54 C 00 58 16.16 +17 52 05.6 413
1995-01-15 10:18:56 C 00 58 15.28 +17 52 27.6 413
1995-05-25 22:27:51 C 20 40 20.50 +45 21 11.0 z 540
1995-05-25 22:42:25 C 20 40 18.25 +45 20 59.9 z 540
1995-05-28 21:38:19 C 20 28 35.62 +44 16 34.5 557
1995-05-28 22:07:58 C 20 28 30.37 +44 16 05.1 557
1995-05-28 23:23:47 C 20 28 16.88 +44 14 49.8 557
1995-05-28 23:48:39 C 20 28 12.41 +44 14 24.6 557
1995-05-29 00:10:29 C 20 28 08.49 +44 14 02.7 557
1995-05-29 00:48:57 C 20 28 01.58 +44 13 23.5 557
1995-05-31 10:17:25 C 20 17 19.36 +43 07 34.7 711
1995-05-31 10:39:03 C 20 17 15.02 +43 07 07.3 711
1995-06-01 10:03:57 C 20 12 34.69 +42 36 07.1 711
1995-06-01 10:11:11 C 20 12 33.16 +42 35 57.0 711
1995-06-14 12:53:24 C 18 51 45.95 +29 23 56.1 c 608
1995-06-14 12:54:38 C 18 51 45.57 +29 23 51.4 c 608
1995-06-14 12:55:47 C 18 51 45.22 +29 23 46.7 c 608
1995-06-15 12:31:20 C 18 44 34.46 +27 45 50.0 c 608
1995-06-15 12:33:18 C 18 44 33.83 +27 45 41.3 c 608
1995-06-15 12:35:24 C 18 44 33.18 +27 45 32.3 c 608
1995-06-15 12:37:01 C 18 44 32.69 +27 45 25.3 c 608
1995-06-15 12:38:21 C 18 44 32.25 +27 45 19.4 c 608
1995-06-15 12:39:56 C 18 44 31.76 +27 45 12.5 c 608
1995-06-15 20:50:00 C 18 42 02.63 +27 09 34.0 z 540
1995-06-15 20:52:04 C 18 42 02.00 +27 09 25.3 z 540
1995-06-15 20:54:15 C 18 42 01.31 +27 09 15.7 z 540
1995-06-16 11:29:50 C 18 37 30.09 +26 04 20.7 c 608
1995-06-16 11:31:50 C 18 37 29.45 +26 04 11.6 c 608
1995-06-16 12:00:51 C 18 37 20.27 +26 01 59.3 c 608
1995-06-16 12:02:32 C 18 37 19.73 +26 01 51.6 c 608
1995-06-16 12:32:48 C 18 37 10.13 +25 59 33.4 c 608
1995-06-16 12:34:31 C 18 37 09.57 +25 59 25.6 c 608
1995-06-17 22:33:52 C 18 26 35.01 +23 17 50.9 118
1995-06-17 23:38:19 C 18 26 14.48 +23 12 32.6 118
1995-06-19 15:12:54 C 18 13 48.95 +19 49 15.9 413
1995-06-19 15:15:51 C 18 13 48.00 +19 49 00.0 413
1995-06-19 22:31:48 C 18 11 31.66 +19 09 23.4 z 046
1995-06-19 22:35:04 C 18 11 30.63 +19 09 05.8 z 046
1995-06-19 22:38:19 C 18 11 29.59 +19 08 48.2 z 046
1995-06-19 22:50:40 C 18 11 25.65 +19 07 41.0 113
1995-06-19 23:05:21 C 18 11 20.98 +19 06 21.7 113
1995-06-19 23:09:29 C 18 11 19.64 +19 05 58.7 113
1995-06-20 16:32:38 C 18 05 51.37 +17 31 02.3 413
1995-06-20 16:35:49 C 18 05 50.35 +17 30 44.4 413
1995-06-20 23:24:07 C 18 03 43.32 +16 52 10.8 z 120
1995-06-20 23:38:48 C 18 03 38.64 +16 50 48.5 z 120
1995-06-21 10:03:02 C 18 00 23.89 +15 52 05.8 c 608
1995-06-21 10:04:21 C 18 00 23.44 +15 51 58.1 c 608
1995-06-21 10:05:31 C 18 00 23.09 +15 51 51.5 c 608
1995-06-21 10:06:46 C 18 00 22.67 +15 51 44.2 c 608
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)