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
2019-07-06 13:44:30 S 07 01 39.360 -64 05 18.92 V C57
2019-07-06 13:44:30 s 1 +126798.65 3 +265805.79 3580.0 C57
2019-07-06 14:14:30 S 07 01 40.094 -64 03 58.97 V C57
2019-07-06 14:14:30 s 1 +126059.86 8 +267482.40 110.0 C57
2019-07-06 14:44:30 S 07 01 40.560 -64 02 47.62 V C57
2019-07-06 14:44:30 s 1 +125315.25 8 +269146.62 5320.0 C57
2019-07-06 15:14:30 S 07 01 41.340 -64 01 29.82 V C57
2019-07-06 15:14:30 s 1 +124564.92 0 +270798.50 9620.0 C57
2019-07-06 15:44:30 S 07 01 41.849 -64 00 15.77 V C57
2019-07-06 15:44:30 s 1 +123808.95 4 +272438.11 3420.0 C57
2019-07-06 16:14:30 S 07 01 42.372 -63 59 01.57 V C57
2019-07-06 16:14:30 s 1 +123047.45 4 +274065.52 7110.0 C57
2019-07-06 16:44:30 S 07 01 43.104 -63 57 42.70 V C57
2019-07-06 16:44:30 s 1 +122280.51 5 +275680.77 1090.0 C57
2019-07-06 17:14:30 S 07 01 43.529 -63 56 31.81 V C57
2019-07-06 17:14:30 s 1 +121508.22 8 +277283.94 5740.0 C57
2019-07-06 17:44:30 S 07 01 44.299 -63 55 12.76 V C57
2019-07-06 17:44:30 s 1 +120730.68 5 +278875.07 1450.0 C57
2019-07-06 18:14:30 S 07 01 44.765 -63 54 00.32 V C57
2019-07-06 18:14:30 s 1 +119947.97 4 +280454.22 8590.0 C57
2019-07-06 18:44:30 S 07 01 45.240 -63 52 44.87 V C57
2019-07-06 18:44:30 s 1 +119160.18 3 +282021.46 7520.0 C57
2019-07-06 19:14:30 S 07 01 45.991 -63 51 27.25 V C57
2019-07-06 19:14:30 s 1 +118367.39 7 +283576.84 8610.0 C57
2019-07-06 19:44:30 S 07 01 46.397 -63 50 16.30 V C57
2019-07-06 19:44:30 s 1 +117569.70 2 +285120.41 2210.0 C57
2019-07-06 20:14:30 S 07 01 47.074 -63 48 57.42 V C57
2019-07-06 20:14:30 s 1 +116767.17 9 +286652.23 8660.0 C57
2019-07-06 20:44:30 S 07 01 47.609 -63 47 45.38 V C57
2019-07-06 20:44:30 s 1 +115959.91 0 +288172.37 8320.0 C57
2019-07-06 21:14:30 S 07 01 48.029 -63 46 29.28 V C57
2019-07-06 21:14:30 s 1 +115147.97 5 +289680.86 1520.0 C57
2019-07-06 21:44:30 S 07 01 48.734 -63 45 12.64 V C57
2019-07-06 21:44:30 s 1 +114331.45 4 +291177.76 8580.0 C57
2019-07-06 22:14:30 S 07 01 49.178 -63 44 00.31 V C57
2019-07-06 22:14:30 s 1 +113510.42 2 +292663.13 9850.0 C57
2019-07-06 22:44:30 S 07 01 49.706 -63 42 42.77 V C57
2019-07-06 22:44:30 s 1 +112684.95 6 +294137.02 5630.0 C57
2019-07-06 23:14:30 S 07 01 50.330 -63 41 30.44 V C57
2019-07-06 23:14:30 s 1 +111855.13 2 +295599.49 6250.0 C57
2019-07-06 23:44:30 S 07 01 50.729 -63 40 12.50 V C57
2019-07-06 23:44:30 s 1 +111021.02 1 +297050.57 2020.0 C57
2019-07-07 00:14:30 S 07 01 51.406 -63 38 57.91 V C57
2019-07-07 00:14:30 s 1 +110182.69 7 +298490.34 3240.0 C57
2019-07-07 02:14:30 S 07 01 53.386 -63 33 56.48 V C57
2019-07-07 02:14:30 s 1 +106788.67 4 +304137.13 8630.0 C57
2019-07-07 02:44:30 S 07 01 53.926 -63 32 43.15 V C57
2019-07-07 02:44:30 s 1 +105930.32 7 +305521.00 1560.0 C57
2019-07-07 03:14:30 S 07 01 54.518 -63 31 27.16 V C57
2019-07-07 03:14:30 s 1 +105068.17 6 +306893.85 1680.0 C57
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)