1866 Sisyphus (1972 XA)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar ⇩ Gaia
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.5381207270 ± 5.42e-09
Semi-major axis (a)1.8933719410 AU ± 4.50e-10
Inclination (i)41.20633494° ± 7.87e-07
Long. of Asc. Node (Ω)63.44668864° ± 1.04e-06
Arg. of Perihelion (ω)293.09862767° ± 1.07e-06
Mean Anomaly (M)140.66424737° ± 8.67e-07
Mean Motion (n)0.3783191899°/day ± 1.35e-10
Perihelion dist (q)0.87450926 AU ± 1.03e-08
Aphelion dist (Q)2.91223463 AU ± 1.03e-08
Orbital Period2.60527700 yr ± 9.28e-10
Physical Parameters
H (abs. magnitude)12.48
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.220″
Uncertainty0
Orbit TypeApollo
MOID0.102869 AU
Observations Used9210
Radar Obs Used1
Gaia Obs Used79
Oppositions38
Arc Total1955-2026
First Observation Used1955-01-26
Last Observation Used2026-04-06
Observations (11960)
Date Type RA Dec Mag Band Observatory
2025-02-11 03:39:32 C 01 53 39.732 +32 27 06.98 V 703
2025-02-11 03:42:32 C 01 53 40.060 +32 27 10.84 V 703
2025-02-11 03:45:31 C 01 53 40.384 +32 27 14.83 V 703
2025-02-12 06:06:14 C 01 56 36.670 +33 01 43.14 V T05
2025-02-12 06:11:27 C 01 56 37.238 +33 01 49.84 V T05
2025-02-12 06:19:23 C 01 56 38.112 +33 01 59.95 V T05
2025-02-13 06:03:37 C 01 59 17.158 +33 32 16.44 V T08
2025-02-13 06:08:22 C 01 59 17.671 +33 32 22.38 V T08
2025-02-13 06:26:31 C 01 59 19.694 +33 32 44.99 V T08
2025-02-13 06:34:40 C 01 59 20.580 +33 32 55.25 V T08
2025-02-14 06:52:06 C 02 02 03.535 +34 03 09.29 V T08
2025-02-14 06:55:31 C 02 02 03.924 +34 03 13.54 V T08
2025-02-14 06:56:11 C 02 02 03.996 +34 03 14.29 V T08
2025-02-14 07:00:52 C 02 02 04.510 +34 03 20.05 V T08
2025-02-14 07:04:52 C 02 02 04.963 +34 03 24.84 V T08
2025-02-14 07:10:10 C 02 02 05.551 +34 03 31.32 V T08
2025-02-14 07:20:12 C 02 02 06.655 +34 03 43.49 V T08
2025-02-14 07:26:16 C 02 02 07.334 +34 03 50.87 V T08
2025-02-14 18:02:01 C 02 03 18.823 +34 16 46.74 Z C23
2025-02-14 18:20:13 C 02 03 20.921 +34 17 09.38 Z C23
2025-02-14 19:04:52 C 02 03 25.769 +34 18 03.38 Z C23
2025-02-15 06:14:37 C 02 04 40.690 +34 31 35.62 V T05
2025-02-15 06:18:37 C 02 04 41.129 +34 31 40.37 V T05
2025-02-15 06:26:35 C 02 04 42.012 +34 31 49.84 V T05
2025-02-15 06:51:40 C 02 04 44.791 +34 32 19.75 V T05
2025-02-16 03:44:40 C 02 07 05.448 +34 57 09.58 V 703
2025-02-16 03:48:02 C 02 07 05.804 +34 57 13.39 V 703
2025-02-16 03:51:23 C 02 07 06.204 +34 57 17.57 V 703
2025-02-16 03:54:45 C 02 07 06.517 +34 57 21.38 V 703
2025-02-16 06:11:23 C 02 07 21.912 +35 00 03.74 V T05
2025-02-16 06:16:03 C 02 07 22.418 +35 00 09.11 V T05
2025-02-16 06:37:17 C 02 07 24.782 +35 00 33.88 V T05
2025-02-16 06:45:13 C 02 07 25.663 +35 00 43.02 V T05
2025-02-16 18:09:33 C 02 08 42.816 +35 14 00.31 Z C23
2025-02-16 18:35:52 C 02 08 45.758 +35 14 30.77 Z C23
2025-02-16 18:49:28 B 02 08 47.27 +35 14 46.2 Z M61
2025-02-16 18:56:20 B 02 08 48.03 +35 14 54.1 Z M61
2025-02-16 19:02:09 B 02 08 48.67 +35 15 01.3 Z M61
2025-02-16 19:22:07 C 02 08 50.902 +35 15 23.94 Z C23
2025-02-16 21:26:07 B 02 09 04.68 +35 17 49.5 q J51
2025-02-16 21:37:24 B 02 09 05.94 +35 18 02.5 q J51
2025-02-16 21:44:02 B 02 09 06.64 +35 18 09.9 q J51
2025-02-17 18:12:18 C 02 11 25.193 +35 41 37.03 Z C23
2025-02-17 18:34:06 C 02 11 27.614 +35 42 01.73 Z C23
2025-02-17 19:46:57 C 02 11 35.770 +35 43 23.95 Z C23
2025-02-18 18:23:55 C 02 14 08.918 +36 08 46.18 Z C23
2025-02-18 18:55:52 C 02 14 12.482 +36 09 21.53 Z C23
2025-02-18 19:26:22 C 02 14 15.902 +36 09 55.04 Z C23
2025-02-19 03:12:23 C 02 15 08.449 +36 18 31.28 V 703
2025-02-19 03:15:29 C 02 15 08.809 +36 18 34.60 V 703
Radar Observations (2)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
1985-12-08 00:00:00 -295248 20 Hz 2380 -1 -1
1985-12-08.000000 -29524800 2000 Hz 2380 251 251
Station codes
-1 Arecibo (305-m, 1963–2020)