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
2025-03-11 03:26:46 C 03 11 04.142 +43 24 43.67 V 703
2025-03-11 03:30:06 C 03 11 04.517 +43 24 45.65 V 703
2025-03-11 03:33:27 C 03 11 04.960 +43 24 48.31 V 703
2025-03-15 05:38:22 C 03 22 57.619 +44 30 48.06 V T08
2025-03-15 05:43:01 C 03 22 58.183 +44 30 50.94 V T08
2025-03-15 05:52:28 C 03 22 59.326 +44 30 56.92 V T08
2025-03-15 06:09:25 C 03 23 01.373 +44 31 07.57 V T08
2025-03-15 19:16:44 C 03 24 37.586 +44 39 27.14 Z C23
2025-03-15 20:03:36 C 03 24 43.310 +44 39 56.41 Z C23
2025-03-15 20:24:23 C 03 24 45.833 +44 40 09.08 Z C23
2025-03-16 19:07:21 C 03 27 32.614 +44 54 22.18 Z C23
2025-03-16 20:25:15 C 03 27 42.050 +44 55 09.34 Z C23
2025-03-17 06:00:46 C 03 28 52.627 +45 01 06.28 V T05
2025-03-17 06:06:43 C 03 28 53.357 +45 01 09.80 V T05
2025-03-17 06:27:53 C 03 28 55.939 +45 01 22.48 V T05
2025-03-17 06:50:26 C 03 28 58.682 +45 01 35.94 V T05
2025-03-18 19:05:05 C 03 33 26.414 +45 23 20.36 Z C23
2025-03-18 19:38:55 C 03 33 30.610 +45 23 40.31 Z C23
2025-03-18 19:58:01 C 03 33 32.926 +45 23 51.68 Z C23
2025-03-21 06:24:33 C 03 40 47.054 +45 57 19.55 V T05
2025-03-21 06:47:06 C 03 40 49.831 +45 57 31.68 V T05
2025-03-21 06:51:49 C 03 40 50.443 +45 57 34.27 V T05
2025-03-21 07:15:14 C 03 40 53.330 +45 57 46.66 V T05
2025-03-24 20:39:08 C 03 51 34.126 +46 43 05.63 Z C23
2025-03-24 20:56:32 C 03 51 36.310 +46 43 13.51 Z C23
2025-03-25 06:23:47 C 03 52 47.575 +46 48 02.30 V T05
2025-03-25 06:46:27 C 03 52 50.414 +46 48 13.39 V T05
2025-03-25 06:55:18 C 03 52 51.528 +46 48 17.71 V T05
2025-03-25 06:59:55 C 03 52 52.121 +46 48 19.94 V T05
2025-03-31 20:07:33 C 04 12 50.398 +48 00 35.86 Z C23
2025-03-31 20:38:10 C 04 12 54.372 +48 00 48.64 Z C23
2025-03-31 21:07:47 C 04 12 58.190 +48 01 00.91 Z C23
2025-04-04 19:24:04 C 04 25 06.799 +48 38 17.74 Z C23
2025-04-04 20:41:39 C 04 25 17.002 +48 38 46.97 Z C23
2025-04-04 20:42:48 C 04 25 17.155 +48 38 47.22 Z C23
2025-04-05 20:50:35 C 04 28 24.766 +48 47 36.85 Z C23
2025-04-05 21:18:25 C 04 28 28.426 +48 47 46.75 Z C23
2025-04-05 21:34:05 C 04 28 30.389 +48 47 52.01 Z C23
2025-04-07 19:12:32 C 04 34 26.330 +49 03 48.10 X L63
2025-04-07 19:32:39 C 04 34 28.918 +49 03 54.68 X L63
2025-04-07 19:59:55 C 04 34 32.398 +49 04 03.83 X L63
2025-04-07 21:08:09 C 04 34 41.422 +49 04 25.68 Z C23
2025-04-07 21:34:48 C 04 34 44.870 +49 04 34.32 Z C23
2025-04-08 05:32:01 C 04 35 46.954 +49 07 17.62 V T08
2025-04-08 05:46:02 C 04 35 48.758 +49 07 21.94 V T08
2025-04-08 06:06:00 C 04 35 51.365 +49 07 28.42 V T08
2025-04-08 19:34:39 B 04 37 36.859 +49 11 53.74 q M04
2025-04-08 19:57:50 B 04 37 39.780 +49 12 00.50 q M04
2025-04-08 20:18:42 B 04 37 42.574 +49 12 07.38 q M04
2025-04-08 20:31:43 B 04 37 44.254 +49 12 11.48 q M04
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)