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
2025-02-02 05:09:30 C 01 29 48.470 +27 09 49.36 V T08
2025-02-02 05:14:08 C 01 29 48.974 +27 09 56.88 V T08
2025-02-02 05:22:59 C 01 29 49.939 +27 10 11.42 V T08
2025-02-02 06:00:20 C 01 29 54.026 +27 11 12.62 V T08
2025-02-02 19:19:10 C 01 31 23.071 +27 32 55.72 Z C23
2025-02-02 19:51:40 C 01 31 26.657 +27 33 48.38 Z C23
2025-02-02 20:33:04 C 01 31 31.190 +27 34 55.09 Z C23
2025-02-03 02:27:16 C 01 32 10.662 +27 44 31.27 V 703
2025-02-03 02:30:38 C 01 32 11.026 +27 44 36.60 V 703
2025-02-03 02:34:01 C 01 32 11.393 +27 44 42.00 V 703
2025-02-03 02:37:23 C 01 32 11.771 +27 44 47.54 V 703
2025-02-03 05:12:39 C 01 32 29.064 +27 48 59.26 V T05
2025-02-03 05:17:56 C 01 32 29.638 +27 49 07.72 V T05
2025-02-03 05:28:27 C 01 32 30.785 +27 49 24.56 V T05
2025-02-03 05:44:17 C 01 32 32.525 +27 49 49.84 V T05
2025-02-03 17:54:24 C 01 33 53.926 +28 09 11.92 Z C23
2025-02-03 18:17:40 C 01 33 56.484 +28 09 49.32 Z C23
2025-02-04 05:11:19 C 01 35 09.041 +28 27 04.03 V T05
2025-02-04 05:15:14 C 01 35 09.470 +28 27 10.19 V T05
2025-02-04 05:23:08 C 01 35 10.334 +28 27 22.46 V T05
2025-02-04 05:37:05 C 01 35 11.856 +28 27 44.21 V T05
2025-02-04 19:39:50 C 01 36 45.528 +28 49 31.76 Z C23
2025-02-04 19:48:24 C 01 36 46.541 +28 49 44.90 Z C23
2025-02-06 05:50:25 C 01 40 33.396 +29 41 29.00 V T08
2025-02-06 05:55:05 C 01 40 33.912 +29 41 35.99 V T08
2025-02-06 06:02:27 C 01 40 34.716 +29 41 46.93 V T08
2025-02-06 06:17:07 C 01 40 36.324 +29 42 08.60 V T08
2025-02-06 17:24:12 B 01 41 50.693 +29 58 35.40 V 160
2025-02-06 17:27:54 B 01 41 51.101 +29 58 40.91 V 160
2025-02-06 17:31:37 B 01 41 51.526 +29 58 46.24 V 160
2025-02-07 04:13:48 C 01 43 02.636 +30 14 27.74 V 703
2025-02-07 04:17:03 C 01 43 02.993 +30 14 32.64 V 703
2025-02-07 04:20:17 C 01 43 03.349 +30 14 37.21 V 703
2025-02-07 04:23:31 C 01 43 03.706 +30 14 41.82 V 703
2025-02-08 03:08:18 C 01 45 35.507 +30 47 29.40 V 703
2025-02-08 03:11:36 C 01 45 35.860 +30 47 34.08 V 703
2025-02-08 03:14:53 C 01 45 36.230 +30 47 38.69 V 703
2025-02-08 03:18:10 C 01 45 36.580 +30 47 43.40 V 703
2025-02-08 05:59:29 C 01 45 54.516 +30 51 34.56 V T05
2025-02-08 06:04:03 C 01 45 55.018 +30 51 40.82 V T05
2025-02-08 06:12:38 C 01 45 55.958 +30 51 53.03 V T05
2025-02-08 06:27:11 C 01 45 57.559 +30 52 13.51 V T05
2025-02-08 17:59:03 B 01 47 14.743 +31 08 27.64 X K87
2025-02-08 18:03:16 B 01 47 15.190 +31 08 33.43 X K87
2025-02-08 18:07:29 B 01 47 15.646 +31 08 39.30 X K87
2025-02-10 06:49:02 C 01 51 20.371 +31 59 14.60 V T08
2025-02-10 06:53:40 C 01 51 20.890 +31 59 20.65 V T08
2025-02-10 07:01:39 C 01 51 21.770 +31 59 31.34 V T08
2025-02-10 07:15:46 C 01 51 23.326 +31 59 50.39 V T08
2025-02-11 03:36:33 C 01 53 39.401 +32 27 02.99 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)