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
2023-02-22 01:23:31 C 13 16 44.10 +60 38 09.0 V 088
2023-02-22 01:26:04 C 13 16 43.93 +60 38 11.3 V 088
2023-02-22 01:28:37 C 13 16 43.78 +60 38 11.9 V 088
2023-02-22 01:31:09 C 13 16 43.57 +60 38 13.9 V 088
2023-02-22 01:33:42 C 13 16 43.40 +60 38 15.5 V 088
2023-02-22 01:36:15 C 13 16 43.26 +60 38 16.5 V 088
2023-02-22 01:41:50 C 13 16 42.91 +60 38 19.4 V 088
2023-02-22 01:44:23 C 13 16 42.72 +60 38 20.6 V 088
2023-02-22 01:46:56 C 13 16 42.54 +60 38 21.8 V 088
2023-02-22 01:49:28 C 13 16 42.37 +60 38 22.3 V 088
2023-02-22 01:52:01 C 13 16 42.21 +60 38 23.9 V 088
2023-02-22 01:54:35 C 13 16 42.05 +60 38 25.0 V 088
2023-02-22 01:57:08 C 13 16 41.87 +60 38 27.0 V 088
2023-02-22 01:59:41 C 13 16 41.70 +60 38 27.8 V 088
2023-02-22 02:02:14 C 13 16 41.58 +60 38 29.1 V 088
2023-02-22 02:04:47 C 13 16 41.40 +60 38 31.1 V 088
2023-02-22 02:07:20 C 13 16 41.25 +60 38 31.7 V 088
2023-02-22 02:09:53 C 13 16 41.07 +60 38 32.8 V 088
2023-02-22 02:12:26 C 13 16 40.89 +60 38 34.6 V 088
2023-02-22 02:14:59 C 13 16 40.73 +60 38 36.4 V 088
2023-02-22 02:17:32 C 13 16 40.58 +60 38 37.0 V 088
2023-02-22 02:20:04 C 13 16 40.37 +60 38 38.6 V 088
2023-02-22 02:25:09 C 13 16 40.08 +60 38 41.0 V 088
2023-02-22 02:27:42 C 13 16 39.88 +60 38 42.7 V 088
2023-02-22 02:30:16 C 13 16 39.70 +60 38 44.1 V 088
2023-02-24 11:54:14 C 13 12 49.392 +61 07 25.79 V T05
2023-02-24 11:58:30 C 13 12 49.099 +61 07 27.88 V T05
2023-02-24 14:52:59 C 13 12 36.468 +61 08 51.50 V T05
2023-02-24 15:54:40 C 13 12 32.038 +61 09 20.41 V T05
2023-02-28 07:37:25 C 13 05 59.370 +61 48 35.86 V 703
2023-02-28 07:45:05 C 13 05 58.722 +61 48 39.35 V 703
2023-02-28 07:52:47 C 13 05 58.088 +61 48 42.52 V 703
2023-02-28 08:00:29 C 13 05 57.491 +61 48 45.86 V 703
2023-03-03 23:17:50 C 12 58 43.73 +62 22 01.4 17.5 q M54
2023-03-04 00:20:06 C 12 58 38.26 +62 22 23.2 17.1 q M54
2023-03-04 01:19:34 C 12 58 32.98 +62 22 43.7 17.1 q M54
2023-03-04 06:08:21 C 12 58 08.206 +62 24 22.07 V 703
2023-03-04 06:16:17 C 12 58 07.482 +62 24 25.20 V 703
2023-03-04 06:24:15 C 12 58 06.791 +62 24 27.61 V 703
2023-03-04 06:32:13 C 12 58 06.056 +62 24 30.46 V 703
2023-03-10 08:07:07 C 12 44 41.730 +63 04 45.48 V 703
2023-03-10 08:15:00 C 12 44 40.949 +63 04 47.35 V 703
2023-03-10 08:22:56 C 12 44 40.128 +63 04 48.86 V 703
2023-03-10 08:30:59 C 12 44 39.368 +63 04 50.74 V 703
2023-03-12 11:05:30 C 12 39 43.723 +63 14 18.31 V T05
2023-03-12 11:11:00 C 12 39 43.181 +63 14 19.36 V T05
2023-03-12 11:48:17 C 12 39 39.430 +63 14 25.37 V T05
2023-03-12 12:29:29 C 12 39 35.266 +63 14 32.10 V T05
2023-03-14 07:34:53 C 12 35 19.093 +63 20 36.60 V 703
2023-03-14 07:42:45 C 12 35 18.323 +63 20 37.75 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)