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
2017-06-23 11:34:17 C 18 18 42.38 -08 57 48.1 L T08
2017-06-23 11:47:18 C 18 18 38.30 -08 59 02.4 L T08
2017-06-23 12:01:11 C 18 18 33.95 -09 00 21.6 L T08
2017-06-23 12:14:19 C 18 18 29.83 -09 01 36.5 L T08
2017-06-23 22:15:42 C 18 15 26.51 -09 58 52.0 15.3 q 006
2017-06-23 22:17:12 C 18 15 26.05 -09 59 00.4 15.3 q 006
2017-06-23 22:19:12 C 18 15 25.42 -09 59 11.8 15.4 q 006
2017-06-23 22:21:12 C 18 15 24.82 -09 59 23.0 15.7 q 006
2017-06-23 22:22:42 C 18 15 24.32 -09 59 31.7 15.2 q 006
2017-06-24 22:15:16 C 18 08 03.48 -12 14 22.0 14.7 q 006
2017-06-24 22:16:46 C 18 08 03.02 -12 14 30.0 14.9 q 006
2017-06-24 22:18:46 C 18 08 02.41 -12 14 41.3 14.7 q 006
2017-06-24 22:20:16 C 18 08 01.91 -12 14 49.6 15.0 q 006
2017-06-24 22:21:46 C 18 08 01.46 -12 14 58.0 14.9 q 006
2017-06-27 05:57:57 C 17 50 55.76 -17 17 43.5 q H45
2017-06-27 05:59:02 C 17 50 55.42 -17 17 49.5 q H45
2017-06-27 05:59:55 C 17 50 55.15 -17 17 54.0 q H45
2017-06-27 06:00:31 C 17 50 54.96 -17 17 57.2 q H45
2017-06-27 06:01:39 C 17 50 54.62 -17 18 02.9 q H45
2017-06-27 06:02:34 C 17 50 54.31 -17 18 07.7 q H45
2017-06-28 07:13:00 C 17 43 14.43 -19 28 01.2 q H45
2017-06-28 07:14:14 C 17 43 14.06 -19 28 07.5 q H45
2017-06-28 07:15:06 C 17 43 13.77 -19 28 11.8 q H45
2017-06-28 07:15:40 C 17 43 13.61 -19 28 14.5 q H45
2017-06-28 07:17:08 C 17 43 13.16 -19 28 22.1 q H45
2017-06-28 07:18:00 C 17 43 12.88 -19 28 26.4 q H45
2019-10-21 14:48:44 C 08 32 04.15 -25 52 52.9 V T05
2019-10-21 14:54:04 C 08 32 04.52 -25 52 50.6 V T05
2019-10-21 15:03:05 C 08 32 05.14 -25 52 48.7 V T05
2019-10-21 15:22:55 C 08 32 06.52 -25 52 43.2 V T05
2019-10-27 13:36:34 C 08 42 31.96 -25 08 29.6 V T08
2019-10-27 13:41:54 C 08 42 32.37 -25 08 28.2 V T08
2019-10-27 14:07:57 C 08 42 34.26 -25 08 18.9 V T08
2019-10-31 14:10:47 C 08 49 54.07 -24 30 38.8 V T08
2019-10-31 14:14:58 C 08 49 54.38 -24 30 37.0 V T08
2019-10-31 14:25:00 C 08 49 55.13 -24 30 33.2 V T08
2019-10-31 14:39:45 C 08 49 56.26 -24 30 26.8 V T08
2019-11-02 14:20:11 C 08 53 42.23 -24 08 44.9 V T05
2019-11-02 14:27:37 C 08 53 42.75 -24 08 41.5 V T05
2019-11-02 14:43:03 C 08 53 43.98 -24 08 34.0 V T05
2019-11-04 13:26:30 C 08 57 31.72 -23 45 00.5 V T08
2019-11-04 13:31:11 C 08 57 32.12 -23 44 58.1 V T08
2019-11-04 13:41:12 C 08 57 32.91 -23 44 52.8 V T08
2019-11-04 13:58:40 C 08 57 34.30 -23 44 43.8 V T08
2019-11-08 14:24:40 C 09 05 48.37 -22 47 36.7 V T08
2019-11-08 14:30:01 C 09 05 48.83 -22 47 33.3 V T08
2019-11-08 14:38:40 C 09 05 49.57 -22 47 27.6 V T08
2019-11-08 14:57:28 C 09 05 51.16 -22 47 15.6 V T08
2019-11-10 14:26:00 C 09 10 09.63 -22 14 05.7 V T05
2019-11-10 14:30:38 C 09 10 10.04 -22 14 02.5 V T05
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)