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
1995-06-29 22:30:57 C 17 00 37.80 -04 19 35.3 118
1995-06-30 09:06:02 C 16 57 52.18 -05 18 49.3 c 608
1995-06-30 09:07:11 C 16 57 51.87 -05 18 55.7 c 608
1995-06-30 09:08:22 C 16 57 51.55 -05 19 02.4 c 608
1995-06-30 21:33:59 C 16 54 39.89 -06 27 51.0 118
1995-07-01 22:39:57 C 16 48 23.09 -08 42 39.5 118
1995-07-03 22:03:10 C 16 37 11.80 -12 41 49.4 476
1995-07-03 22:11:15 C 16 37 09.92 -12 42 29.8 476
1995-07-05 10:57:14 C 16 29 04.43 -15 33 09.0 c 608
1995-07-05 10:58:22 C 16 29 04.18 -15 33 13.7 c 608
1995-07-05 10:59:23 C 16 29 03.95 -15 33 18.6 c 608
1995-07-05 11:00:28 C 16 29 03.71 -15 33 23.2 c 608
1995-07-06 09:13:45 C 16 24 26.82 -17 10 15.9 c 608
1995-07-06 09:15:13 C 16 24 26.52 -17 10 22.1 c 608
1995-07-06 09:16:20 C 16 24 26.27 -17 10 27.1 c 608
1995-07-06 09:17:28 C 16 24 26.04 -17 10 31.8 c 608
1995-07-06 09:18:35 C 16 24 25.79 -17 10 36.7 c 608
1995-07-06 11:35:18 C 16 23 58.51 -17 19 57.5 413
1995-07-06 11:38:43 C 16 23 57.79 -17 20 12.0 413
1995-07-07 10:10:56 C 16 19 28.59 -18 53 19.9 c 608
1995-07-07 10:12:21 C 16 19 28.31 -18 53 25.4 c 608
1995-07-07 10:13:29 C 16 19 28.07 -18 53 29.7 c 608
1995-07-07 10:14:37 C 16 19 27.84 -18 53 34.3 c 608
1995-07-07 10:15:55 C 16 19 27.59 -18 53 39.7 c 608
1995-07-20 10:14:52 C 15 35 48.66 -33 30 17.5 413
1995-07-20 10:18:19 C 15 35 48.36 -33 30 24.0 413
1997-11-05 19:53:50 C 08 44 40.55 -31 12 06.0 z 381
1997-11-05 19:58:37 C 08 44 40.84 -31 12 05.1 z 381
1997-11-05 20:02:36 C 08 44 41.09 -31 12 04.1 z 381
1997-12-04 19:54:00 C 09 40 50.58 -21 43 21.2 360
1997-12-04 19:56:59 C 09 40 50.99 -21 43 14.3 360
1998-06-08 00:49:56 C 20 41 30.73 -09 59 10.8 118
1998-06-08 00:56:11 C 20 41 30.06 -09 59 36.3 118
1998-07-12 09:17:01 C 17 06 48.12 -60 23 16.0 422
1998-07-12 09:18:05 C 17 06 47.80 -60 23 17.6 422
1998-07-12 09:19:10 C 17 06 47.41 -60 23 19.1 422
1998-08-13 11:29:24 C 15 06 18.19 -62 12 45.3 422
1998-08-13 11:31:33 C 15 06 18.20 -62 12 45.6 422
1998-08-13 11:33:13 C 15 06 18.15 -62 12 45.4 422
2001-07-22 09:00:49 C 16 41 27.00 -82 34 50.2 474
2001-07-22 09:03:08 C 16 41 25.15 -82 34 49.8 474
2001-07-22 09:05:26 C 16 41 23.18 -82 34 49.2 474
2003-10-27 11:40:05 C 10 16 22.62 +10 27 06.9 o 699
2003-10-27 11:54:28 C 10 16 25.35 +10 27 26.2 o 699
2003-10-27 12:08:53 C 10 16 28.19 +10 27 45.6 o 699
2003-10-27 12:23:19 C 10 16 30.98 +10 28 05.0 o 699
2003-10-29 10:55:14 C 10 25 48.06 +11 31 06.3 18.1 c 704
2003-10-29 11:13:20 C 10 25 51.73 +11 31 31.2 18.0 c 704
2003-10-29 11:31:08 C 10 25 55.35 +11 31 55.4 17.9 c 704
2003-10-29 11:48:14 C 10 25 58.79 +11 32 19.0 17.7 c 704
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)