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
2003-06-23 04:32:48 C 13 40 28.48 +09 58 35.2 c 704
2003-06-23 04:47:02 C 13 40 28.10 +09 58 25.1 c 704
2003-06-23 05:01:13 C 13 40 27.69 +09 58 13.5 c 704
2003-06-23 05:15:24 C 13 40 27.32 +09 58 03.4 c 704
2003-06-23 20:18:15 C 13 40 04.13 +09 46 45.4 a 233
2003-06-23 20:45:51 C 13 40 03.32 +09 46 24.9 a 233
2003-06-23 20:52:35 C 13 40 03.30 +09 46 20.3 a 233
2003-06-23 20:58:01 C 13 40 03.11 +09 46 15.9 a 233
2003-06-30 04:11:39 C 13 36 56.67 +07 50 56.6 c 704
2003-06-30 04:40:35 C 13 36 55.90 +07 50 34.1 c 704
2003-06-30 04:54:53 C 13 36 55.83 +07 50 23.1 c 704
2003-06-30 05:02:54 C 13 36 55.73 +07 50 17.2 m 333
2003-06-30 05:09:12 C 13 36 55.61 +07 50 12.1 c 704
2003-06-30 05:18:55 C 13 36 55.46 +07 50 04.4 m 333
2003-06-30 05:35:01 C 13 36 55.17 +07 49 52.0 m 333
2003-06-30 05:51:00 C 13 36 54.93 +07 49 40.0 m 333
2003-07-01 04:05:35 C 13 36 34.90 +07 32 25.4 c 704
2003-07-01 04:20:27 C 13 36 34.66 +07 32 14.1 c 704
2003-07-01 04:34:59 C 13 36 34.42 +07 32 02.6 c 704
2003-07-01 04:49:25 C 13 36 34.19 +07 31 51.2 c 704
2003-07-01 05:04:05 C 13 36 33.98 +07 31 39.7 c 704
2003-07-04 04:09:39 C 13 35 41.61 +06 36 10.1 c 704
2003-07-04 04:24:46 C 13 35 41.46 +06 35 59.0 c 704
2003-07-04 04:39:07 C 13 35 41.29 +06 35 47.6 c 704
2003-07-04 04:53:33 C 13 35 41.12 +06 35 36.3 c 704
2003-07-04 05:07:52 C 13 35 40.99 +06 35 25.1 c 704
2003-07-23 20:42:10 C 13 36 48.92 +00 19 03.4 c J87
2003-07-23 20:54:24 C 13 36 49.13 +00 18 53.2 c J87
2003-07-23 21:02:52 C 13 36 49.20 +00 18 46.7 c J87
2003-07-24 21:08:48 C 13 37 10.18 -00 00 39.6 c 938
2003-07-24 21:36:13 C 13 37 10.57 -00 01 02.4 c 938
2003-07-24 22:25:35 C 13 37 11.34 -00 01 41.9 c 938
2003-07-26 20:51:50 C 13 37 56.27 -00 39 13.7 d J87
2003-07-26 21:02:52 C 13 37 56.46 -00 39 23.0 d J87
2004-01-04 10:08:05 C 21 23 10.671 -38 37 04.52 r 413
2004-01-04 10:10:09 C 21 23 11.193 -38 37 01.95 r 413
2004-01-04 10:12:10 C 21 23 11.704 -38 36 59.37 r 413
2004-01-04 10:18:10 C 21 23 13.234 -38 36 51.42 r 413
2004-01-04 10:21:09 C 21 23 14.006 -38 36 47.60 r 413
2004-02-29 18:43:39 C 01 29 18.23 +08 22 01.1 c A32
2004-02-29 18:51:46 C 01 29 19.28 +08 22 16.4 c A32
2004-02-29 19:01:31 C 01 29 20.57 +08 22 35.2 c A32
2004-02-29 19:11:15 C 01 29 21.85 +08 22 54.4 c A32
2004-02-29 19:20:59 C 01 29 23.12 +08 23 13.3 c A32
2004-03-03 18:51:14 C 01 38 43.60 +10 39 17.4 c A32
2004-03-03 18:56:06 C 01 38 44.23 +10 39 26.6 c A32
2004-03-03 19:00:59 C 01 38 44.85 +10 39 35.6 c A32
2004-03-03 19:05:51 C 01 38 45.50 +10 39 44.5 c A32
2004-03-03 19:10:43 C 01 38 46.12 +10 39 53.5 c A32
2004-12-02 11:20:34 C 13 21 06.71 +34 10 22.3 c 704
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)