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
2025-04-10 20:42:12 C 04 44 02.062 +49 27 19.40 Z C23
2025-04-10 21:35:39 C 04 44 09.067 +49 27 35.39 Z C23
2025-04-14 19:57:33 C 04 56 32.330 +49 54 06.19 Z C23
2025-04-14 20:25:48 C 04 56 36.036 +49 54 14.00 Z C23
2025-04-18 20:26:27 C 05 09 15.871 +50 17 03.37 Z C23
2025-04-18 21:07:33 C 05 09 21.334 +50 17 11.90 Z C23
2025-04-18 21:50:24 C 05 09 26.983 +50 17 20.80 Z C23
2025-04-25 20:37:07 C 05 31 32.266 +50 47 23.14 Z C23
2025-04-25 21:09:01 C 05 31 36.490 +50 47 27.78 Z C23
2025-04-25 21:56:42 C 05 31 42.811 +50 47 33.97 Z C23
2025-04-26 21:14:34 C 05 34 48.144 +50 50 50.68 Z C23
2025-04-26 21:53:24 C 05 34 53.299 +50 50 54.42 Z C23
2025-04-29 20:48:46 C 05 44 17.527 +50 59 25.98 Z C23
2025-04-29 21:38:26 C 05 44 24.139 +50 59 31.16 Z C23
2025-04-29 22:15:23 C 05 44 29.014 +50 59 34.69 Z C23
2025-05-01 03:20:49 C 05 48 20.228 +51 02 30.55 V 703
2025-05-01 03:24:15 C 05 48 20.632 +51 02 31.02 V 703
2025-05-01 03:27:40 C 05 48 21.042 +51 02 31.31 V 703
2025-05-01 03:31:05 C 05 48 21.492 +51 02 31.74 V 703
2025-05-04 20:23:54 C 06 00 06.938 +51 09 16.99 Z C23
2025-05-04 21:13:06 C 06 00 13.512 +51 09 19.87 Z C23
2025-05-08 20:46:00 C 06 12 48.648 +51 13 13.55 Z C23
2025-05-08 21:11:14 C 06 12 52.142 +51 13 14.59 Z C23
2025-05-08 21:48:03 C 06 12 56.986 +51 13 14.59 Z C23
2025-05-09 20:28:43 C 06 15 55.486 +51 13 41.27 Z C23
2025-05-09 21:17:16 C 06 16 01.966 +51 13 40.33 Z C23
2025-05-12 20:41:15 C 06 25 22.610 +51 13 44.94 Z C23
2025-05-12 21:08:51 C 06 25 26.124 +51 13 45.05 Z C23
2025-05-15 02:17:49 B 06 32 21.466 +51 12 36.68 q X04
2025-05-15 02:49:52 B 06 32 25.514 +51 12 35.57 q X04
2025-05-15 03:19:03 B 06 32 29.515 +51 12 33.77 q X04
2025-11-24 14:41:25 C 13 29 35.558 +29 23 13.96 V T05
2025-11-24 14:46:52 C 13 29 35.935 +29 23 13.56 V T05
2025-11-24 14:57:45 C 13 29 36.550 +29 23 13.06 V T05
2025-11-24 15:22:07 C 13 29 37.946 +29 23 11.65 V T05
2025-11-29 15:06:17 C 13 36 30.360 +29 15 53.57 V T05
2025-11-29 15:11:02 C 13 36 30.653 +29 15 53.14 V T05
2025-11-29 15:38:17 C 13 36 32.141 +29 15 52.38 V T05
2025-11-29 15:51:45 C 13 36 32.834 +29 15 51.30 V T05
2025-12-04 15:08:28 C 13 43 10.829 +29 12 26.89 V T05
2025-12-04 15:32:10 C 13 43 12.096 +29 12 26.78 V T05
2025-12-04 15:38:12 C 13 43 12.434 +29 12 26.71 V T05
2025-12-04 15:54:30 C 13 43 13.298 +29 12 26.68 V T05
2025-12-09 14:42:23 C 13 49 35.981 +29 13 02.78 V T08
2025-12-09 14:46:59 C 13 49 36.178 +29 13 03.36 V T08
2025-12-09 14:56:53 C 13 49 36.734 +29 13 03.47 V T08
2025-12-09 15:24:23 C 13 49 38.150 +29 13 03.97 V T08
2025-12-11 14:47:13 C 13 52 06.713 +29 14 27.67 V T05
2025-12-11 14:51:16 C 13 52 06.917 +29 14 27.85 V T05
2025-12-11 15:19:03 C 13 52 08.328 +29 14 29.40 V T05
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)