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
1976-01-04 02:33:00 A 21 26 26.61 +58 53 38.5 688
1976-01-04 02:57:00 A 21 26 22.67 +58 52 01.6 688
1976-01-27 02:08:00 A 21 05 29.09 +47 38 34.0 695
1976-02-03 02:15:00 A 21 03 50.86 +46 21 52.8 693
1976-03-26 11:10:45 A 21 06 11.45 +37 04 50.2 695
1976-03-26 11:56:56 A 21 06 11.84 +37 04 29.0 695
1976-05-25 09:33:00 A 20 53 01.18 +17 26 16.7 693
1976-05-29 06:22:15 A 20 46 05.32 +14 06 21.0 A 801
1976-06-04 06:09:57 A 20 31 29.82 +07 24 56.9 A 801
1976-06-05 07:24:56 A 20 28 22.34 +06 00 43.2 695
1976-06-05 07:44:17 A 20 28 19.77 +05 59 36.4 695
1976-06-06 07:50:31 A 20 25 08.50 +04 35 10.1 807
1976-06-06 08:20:00 A 20 25 04.34 +04 33 23.7 807
1976-06-25 07:09:41 A 18 44 24.36 -31 58 19.1 695
1976-06-25 07:24:46 A 18 44 19.68 -31 59 30.3 695
1976-07-02 11:15:55 A 17 49 09.55 -43 24 43.1 16.8 485
1976-07-02 12:23:30 A 17 48 47.55 -43 28 11.1 485
1976-07-03 03:07:49 A 17 44 01.83 -44 13 16.1 809
1976-07-03 03:17:47 A 17 43 58.55 -44 13 47.0 809
1976-07-03 13:50:40 A 17 40 33.44 -44 44 31.2 485
1976-07-03 14:57:02 A 17 40 11.59 -44 47 40.4 485
1978-11-29 10:14:24 A 11 06 15.07 +05 16 45.3 A 801
1978-11-29 13:02:00 A 11 07 04.19 +05 26 33.2 17.0 675
1978-11-30 13:03:59 A 11 14 16.07 +06 52 05.4 17.0 675
1978-12-07 09:24:17 A 12 14 06.41 +18 00 24.2 A 801
1978-12-29 10:12:36 A 16 32 50.79 +39 07 00.0 A 801
1979-07-02 07:04:58 A 20 24 28.3 -66 33 07 805
1979-07-16 02:36:55 A 17 50 40.3 -76 45 13 805
1992-01-15 11:17:40 02 03 32.38 -23 17 20.4 413
1992-01-15 11:20:06 02 03 32.23 -23 17 10.0 413
1992-06-10 05:49:15 17 02 54.78 +73 15 56.9 711
1992-07-08 04:24:51 15 01 00.20 +20 40 25.7 711
1994-08-27 19:20:08 C 06 47 31.16 -43 56 45.1 413
1994-08-28 19:26:13 C 06 49 36.72 -43 59 19.3 413
1994-09-18 18:40:00 C 07 27 32.28 -45 20 27.0 413
1994-09-18 18:44:00 C 07 27 32.48 -45 20 27.9 413
1994-11-11 17:57:06 C 08 01 33.50 -52 53 52.4 413
1994-11-11 17:59:37 C 08 01 33.40 -52 53 53.4 413
1994-12-18 13:22:08 C 05 15 52.12 -53 44 02.7 413
1994-12-18 13:24:25 C 05 15 51.06 -53 43 58.4 413
1994-12-19 14:34:12 C 05 04 30.53 -52 52 08.7 413
1994-12-19 14:37:26 C 05 04 29.02 -52 52 01.5 413
1995-01-12 11:01:42 C 01 14 36.18 +10 40 45.5 413
1995-01-12 11:05:02 C 01 14 35.33 +10 41 07.7 413
1995-01-13 10:22:36 C 01 08 59.58 +13 11 47.3 413
1995-01-13 10:25:54 C 01 08 58.78 +13 12 07.9 413
1995-01-14 10:59:29 C 01 03 21.00 +15 40 43.1 413
1995-01-14 11:03:53 C 01 03 20.00 +15 41 08.6 413
1995-01-14 11:07:30 C 01 03 19.18 +15 41 29.4 413
1995-01-15 10:12:12 C 00 58 16.75 +17 51 51.0 413
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)