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
2003-05-06 08:21:40 C 14 47 52.97 +19 33 44.0 16.0 H72
2003-05-06 08:26:59 C 14 47 52.52 +19 33 43.1 16.1 H72
2003-05-06 08:30:27 C 14 47 52.21 +19 33 42.5 16.0 H72
2003-05-06 08:32:08 C 14 47 52.05 +19 33 42.3 16.0 H72
2003-05-07 00:59:16 C 14 46 36.37 +19 31 31.2 c J93
2003-05-07 01:10:50 C 14 46 35.56 +19 31 29.1 c J93
2003-05-07 01:37:32 C 14 46 33.34 +19 31 25.7 c J93
2003-05-07 01:41:36 C 14 46 33.07 +19 31 24.1 c J93
2003-05-08 03:50:38 C 14 44 32.44 +19 27 31.1 15.9 c H72
2003-05-08 03:52:50 C 14 44 32.26 +19 27 30.7 15.9 c H72
2003-05-08 03:54:43 C 14 44 32.03 +19 27 30.2 15.9 c H72
2003-05-08 04:03:49 C 14 44 31.32 +19 27 28.8 15.9 c H72
2003-05-08 04:05:58 C 14 44 31.20 +19 27 27.3 16.3 c H72
2003-05-08 07:38:28 C 14 44 14.86 +19 26 55.1 o 608
2003-05-08 07:54:36 C 14 44 13.59 +19 26 52.5 o 608
2003-05-08 08:09:55 C 14 44 12.39 +19 26 50.1 o 608
2003-05-08 12:35:11 C 14 43 51.83 +19 26 04.5 379
2003-05-08 12:47:07 C 14 43 50.92 +19 26 04.1 379
2003-05-08 12:49:39 C 14 43 50.71 +19 26 02.7 379
2003-05-09 13:38:32 C 14 41 55.72 +19 21 40.1 379
2003-05-09 13:40:50 C 14 41 55.62 +19 21 39.3 379
2003-05-09 13:45:35 C 14 41 55.23 +19 21 38.6 379
2003-05-09 13:47:51 C 14 41 55.08 +19 21 38.3 379
2003-05-09 13:50:57 C 14 41 54.80 +19 21 38.0 379
2003-05-09 21:21:53 C 14 41 20.12 +19 20 11.7 J87
2003-05-09 21:23:11 C 14 41 20.03 +19 20 11.2 J87
2003-05-09 22:04:47 C 14 41 16.58 +19 20 02.2 c 084
2003-05-09 22:42:23 C 14 41 13.75 +19 19 56.0 d 170
2003-05-09 22:42:57 C 14 41 13.71 +19 19 56.0 d 170
2003-05-11 06:20:17 C 14 38 47.32 +19 13 27.4 c 704
2003-05-11 06:37:13 C 14 38 45.99 +19 13 23.8 c 704
2003-05-11 06:53:47 C 14 38 44.69 +19 13 20.1 c 704
2003-05-11 07:10:30 C 14 38 43.40 +19 13 17.1 c 704
2003-05-11 07:27:25 C 14 38 42.02 +19 13 12.9 c 704
2003-05-12 04:57:38 C 14 37 02.98 +19 08 20.0 c 704
2003-05-12 05:14:12 C 14 37 01.68 +19 08 15.7 c 704
2003-05-12 05:31:45 C 14 37 00.31 +19 08 11.9 c 704
2003-05-12 05:49:56 C 14 36 58.89 +19 08 07.6 c 704
2003-05-12 06:06:23 C 14 36 57.60 +19 08 03.7 c 704
2003-05-13 23:07:38 C 14 33 48.81 +18 57 41.4 c 084
2003-05-15 10:33:41 C 14 31 06.92 +18 47 48.0 16.9 c 608
2003-05-15 10:48:27 C 14 31 05.78 +18 47 43.5 16.8 c 608
2003-05-15 11:04:04 C 14 31 04.60 +18 47 38.8 16.4 c 608
2003-05-16 22:19:14 C 14 28 25.26 +18 36 43.2 J87
2003-05-16 22:20:54 C 14 28 25.17 +18 36 42.4 J87
2003-05-16 22:29:11 C 14 28 24.51 +18 36 40.0 J87
2003-05-18 01:33:16 C 14 26 22.87 +18 27 40.7 d 941
2003-05-18 01:34:55 C 14 26 22.75 +18 27 40.1 d 941
2003-05-18 01:36:34 C 14 26 22.63 +18 27 39.5 d 941
2003-05-18 01:38:14 C 14 26 22.50 +18 27 39.0 d 941
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)