IAA RAS IAA Minor Planet Database

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
2020-06-03 12:49:57 C 21 08 09.00 -14 52 40.9 – V T08
2020-06-04 11:56:33 C 21 07 06.54 -16 13 31.9 – V T08
2020-06-04 11:59:51 C 21 07 06.38 -16 13 43.7 – V T08
2020-06-04 12:09:10 C 21 07 05.90 -16 14 16.9 – V T08
2020-06-04 12:27:14 C 21 07 04.97 -16 15 21.4 – V T08
2020-06-05 12:20:48 C 21 05 53.62 -17 41 37.5 – V T05
2020-06-05 12:23:26 C 21 05 53.46 -17 41 47.1 – V T05
2020-06-05 12:28:45 C 21 05 53.18 -17 42 07.1 – V T05
2020-06-05 12:41:58 C 21 05 52.44 -17 42 55.3 – V T05
2020-06-05 12:43:19 C 21 05 52.36 -17 43 00.5 – V T05
2020-06-05 12:45:18 C 21 05 52.25 -17 43 07.6 – V T05
2020-06-05 12:53:16 C 21 05 51.80 -17 43 37.0 – V T05
2020-06-05 13:11:07 C 21 05 50.80 -17 44 42.5 – V T05
2020-06-07 11:45:22 C 21 03 11.04 -20 40 31.4 – V T08
2020-06-07 11:58:03 C 21 03 10.22 -20 41 20.4 – V T08
2020-06-07 12:02:44 C 21 03 09.88 -20 41 38.8 – V T08
2020-06-07 12:19:22 C 21 03 08.78 -20 42 43.7 – V T08
2020-06-11 13:20:42 C 20 55 53.12 -27 18 33.0 – V T08
2020-06-11 13:23:21 C 20 55 52.89 -27 18 44.1 – V T08
2020-06-11 13:27:20 C 20 55 52.53 -27 19 01.2 – V T08
2020-06-11 13:34:37 C 20 55 51.86 -27 19 32.3 – V T08
2020-06-13 01:42:59 C 20 52 28.61 -29 55 14.7 – o K95
2020-06-13 01:48:18 C 20 52 28.05 -29 55 38.1 – o K95
2020-06-14 05:58:14 C 20 49 32.04 -31 59 38.3 – q Y00
2020-06-14 05:59:41 C 20 49 31.79 -31 59 45.1 – q Y00
2020-06-14 06:01:15 C 20 49 31.66 -31 59 50.8 – q Y00
2020-06-15 12:26:11 C 20 46 02.79 -34 15 38.8 – V T08
2020-06-15 12:35:29 C 20 46 01.63 -34 16 20.3 – V T08
2020-06-15 12:40:08 C 20 46 01.04 -34 16 41.3 – V T08
2020-06-15 12:50:05 C 20 45 59.77 -34 17 25.9 – V T08
2020-06-16 11:45:05 C 20 43 08.358 -36 00 25.38 – U F51
2020-06-16 11:48:48 C 20 43 07.859 -36 00 42.24 – U F51
2020-06-16 11:59:04 C 20 43 06.472 -36 01 28.51 – U F51
2020-06-16 12:02:47 C 20 43 05.972 -36 01 45.35 – U F51
2020-06-16 12:26:59 C 20 43 02.691 -36 03 34.70 – U F51
2020-06-16 12:30:42 C 20 43 02.189 -36 03 51.49 – U F51
2020-06-16 13:21:14 C 20 42 55.32 -36 07 39.6 – V T05
2020-06-16 13:31:16 C 20 42 53.95 -36 08 24.7 – V T05
2020-06-16 14:11:54 C 20 42 48.40 -36 11 27.5 – V T05
2020-06-16 14:16:31 C 20 42 47.77 -36 11 48.3 – V T05
2020-06-16 14:48:48 C 20 42 43.39 -36 14 13.4 – V T05
2020-06-17 12:32:34 C 20 39 47.79 -37 52 15.1 – V T05
2020-06-17 12:41:17 C 20 39 46.51 -37 52 54.3 – V T05
2020-06-17 12:55:17 C 20 39 44.46 -37 53 57.7 – V T05
2020-06-17 12:55:57 C 20 39 44.36 -37 54 00.6 – V T05
2020-06-17 12:57:57 C 20 39 44.08 -37 54 09.7 – V T05
2020-06-17 13:04:34 C 20 39 43.11 -37 54 39.7 – V T05
2020-06-17 13:13:10 C 20 39 41.85 -37 55 18.5 – V T05
2020-06-22 01:44:28 C 20 21 42.82 -45 58 24.8 – q Y00
2020-06-22 01:46:06 C 20 21 42.33 -45 58 32.7 – q Y00
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)