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
2003-04-24 08:31:57 C 15 09 05.72 +19 39 52.1 c 704
2003-04-24 08:49:19 C 15 09 04.51 +19 39 53.3 c 704
2003-04-24 23:06:25 C 15 08 05.29 +19 40 52.3 c 084
2003-04-26 00:02:37 C 15 06 20.55 +19 42 22.3 c 632
2003-04-26 00:20:39 C 15 06 19.29 +19 42 22.6 c 632
2003-04-26 00:20:40 C 15 06 19.20 +19 42 21.9 c 084
2003-04-26 00:38:24 C 15 06 18.03 +19 42 22.8 c 632
2003-04-26 22:57:25 C 15 04 42.95 +19 43 21.4 c 084
2003-04-27 08:11:16 C 15 04 03.357 +19 43 41.58 g 689
2003-04-27 14:38:34 C 15 03 35.46 +19 43 52.4 300
2003-04-27 14:40:55 C 15 03 35.39 +19 43 53.7 300
2003-04-27 14:43:16 C 15 03 35.15 +19 43 53.1 300
2003-04-27 14:45:37 C 15 03 34.99 +19 43 53.5 300
2003-04-27 14:48:00 C 15 03 34.89 +19 43 54.0 300
2003-04-27 14:50:21 C 15 03 34.75 +19 43 53.6 300
2003-04-28 08:05:25 C 15 02 19.765 +19 44 13.03 g 689
2003-04-28 13:39:11 C 15 01 55.64 +19 44 17.7 379
2003-04-28 13:48:18 C 15 01 54.97 +19 44 18.0 379
2003-04-30 07:54:49 C 14 58 49.235 +19 44 07.31 g 689
2003-04-30 15:01:20 C 14 58 17.65 +19 43 59.0 300
2003-04-30 15:04:12 C 14 58 17.41 +19 43 58.9 300
2003-04-30 15:07:03 C 14 58 17.22 +19 43 58.3 300
2003-04-30 15:09:54 C 14 58 17.00 +19 43 59.1 300
2003-04-30 15:12:44 C 14 58 16.79 +19 43 58.5 300
2003-04-30 15:15:35 C 14 58 16.57 +19 43 59.0 300
2003-05-02 07:43:12 C 14 55 14.909 +19 42 23.95 g 689
2003-05-02 23:53:02 C 14 54 01.64 +19 41 24.1 c 084
2003-05-03 19:51:11 C 14 52 31.07 +19 39 57.3 d 151
2003-05-03 19:56:01 C 14 52 30.71 +19 39 56.9 d 151
2003-05-03 19:59:00 C 14 52 30.47 +19 39 56.7 d 151
2003-05-03 20:05:40 C 14 52 29.95 +19 39 56.1 d 151
2003-05-03 20:10:12 C 14 52 29.60 +19 39 55.9 d 151
2003-05-04 21:15:14 C 14 50 34.83 +19 37 40.3 c 196
2003-05-04 22:09:09 C 14 50 30.64 +19 37 35.3 c 196
2003-05-04 23:52:01 C 14 50 22.64 +19 37 25.1 c 240
2003-05-04 23:55:09 C 14 50 22.39 +19 37 24.7 c 240
2003-05-04 23:56:44 C 14 50 22.27 +19 37 24.5 c 240
2003-05-05 00:01:28 C 14 50 21.90 +19 37 24.0 c 240
2003-05-05 00:02:16 C 14 50 21.84 +19 37 23.9 c 240
2003-05-05 00:03:04 C 14 50 21.78 +19 37 23.8 c 240
2003-05-05 00:06:14 C 14 50 21.53 +19 37 23.5 c 240
2003-05-05 07:25:24 C 14 49 47.945 +19 36 38.37 g 689
2003-05-05 13:14:07 C 14 49 21.45 +19 36 00.3 379
2003-05-05 13:38:34 C 14 49 19.53 +19 35 57.1 379
2003-05-05 17:21:55 C 14 49 02.03 +19 35 32.1 379
2003-05-05 17:24:18 C 14 49 01.88 +19 35 31.7 379
2003-05-05 23:08:06 C 14 48 35.60 +19 34 50.0 c 084
2003-05-06 00:39:48 C 14 48 28.61 +19 34 39.5 c J93
2003-05-06 00:43:51 C 14 48 28.32 +19 34 39.0 c J93
2003-05-06 00:47:55 C 14 48 28.00 +19 34 38.4 c J93
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)