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
2019-07-11 08:14:30 s 1 -93791.077 0 +399162.60 3480.0 C57
2019-07-11 10:44:30 S 07 02 55.858 -59 20 14.21 V C57
2019-07-11 10:44:30 s 1 -98446.117 0 +397372.99 9440.0 C57
2019-07-11 11:14:30 S 07 02 56.110 -59 19 06.06 V C57
2019-07-11 11:14:30 s 1 -99371.530 0 +396992.96 2820.0 C57
2019-07-11 11:44:30 S 07 02 56.342 -59 17 53.27 V C57
2019-07-11 11:44:30 s 1 -100295.03 2 +396605.57 4750.0 C57
2019-07-11 12:14:30 S 07 02 56.431 -59 16 43.64 V C57
2019-07-11 12:14:30 s 1 -101216.60 6 +396210.81 5170.0 C57
2019-07-11 12:44:30 S 07 02 56.578 -59 15 34.52 V C57
2019-07-11 12:44:30 s 1 -102136.23 1 +395808.68 4020.0 C57
2019-07-11 13:14:30 S 07 02 56.887 -59 14 22.20 V C57
2019-07-11 13:14:30 s 1 -103053.88 8 +395399.19 1210.0 C57
2019-07-11 13:44:30 S 07 02 57.034 -59 13 12.79 V C57
2019-07-11 13:44:30 s 1 -103969.55 8 +394982.32 6670.0 C57
2019-07-11 14:14:30 S 07 02 57.118 -59 12 01.69 V C57
2019-07-11 14:14:30 s 1 -104883.22 1 +394558.08 340.0 C57
2019-07-11 14:44:30 S 07 02 57.425 -59 10 50.88 V C57
2019-07-11 14:44:30 s 1 -105794.85 8 +394126.46 2140.0 C57
2019-07-11 15:44:30 S 07 02 57.694 -59 08 30.73 V C57
2019-07-11 15:44:30 s 1 -107611.97 3 +393241.12 9860.0 C57
2019-07-11 16:14:30 S 07 02 57.955 -59 07 21.29 V C57
2019-07-11 16:14:30 s 1 -108517.41 3 +392787.38 5620.0 C57
2019-07-11 16:44:30 S 07 02 58.183 -59 06 08.39 V C57
2019-07-11 16:44:30 s 1 -109420.74 6 +392326.26 9230.0 C57
2019-07-11 17:14:30 S 07 02 58.258 -59 04 59.52 V C57
2019-07-11 17:14:30 s 1 -110321.95 4 +391857.77 610.0 C57
2019-07-11 17:44:30 S 07 02 58.428 -59 03 48.71 V C57
2019-07-11 17:44:30 s 1 -111221.01 6 +391381.89 9680.0 C57
2019-07-11 18:14:30 S 07 02 58.716 -59 02 38.58 V C57
2019-07-11 18:14:30 s 1 -112117.91 1 +390898.63 6380.0 C57
2019-07-11 18:44:30 S 07 02 58.817 -59 01 29.21 V C57
2019-07-11 18:44:30 s 1 -113012.62 1 +390407.98 630.0 C57
2019-07-11 19:14:30 S 07 02 58.910 -59 00 17.21 V C57
2019-07-11 19:14:30 s 1 -113905.12 3 +389909.95 2350.0 C57
2019-07-11 19:44:30 S 07 02 59.230 -58 59 08.81 V C57
2019-07-11 19:44:30 s 1 -114795.39 9 +389404.52 1480.0 C57
2019-07-11 20:14:30 S 07 02 59.410 -58 57 55.66 V C57
2019-07-11 20:14:30 s 1 -115683.42 6 +388891.70 7930.0 C57
2019-07-11 20:44:30 S 07 02 59.472 -58 56 48.30 V C57
2019-07-11 20:44:30 s 1 -116569.18 5 +388371.49 1640.0 C57
2019-07-11 22:44:30 S 07 03 00.221 -58 52 05.99 V C57
2019-07-11 22:44:30 s 1 -120089.11 5 +386216.61 7530.0 C57
2019-07-11 23:14:30 S 07 03 00.466 -58 50 56.94 V C57
2019-07-11 23:14:30 s 1 -120963.21 6 +385659.38 6380.0 C57
2019-07-11 23:44:30 S 07 03 00.605 -58 49 45.88 V C57
2019-07-11 23:44:30 s 1 -121834.92 2 +385094.72 2040.0 C57
2019-07-12 00:14:30 S 07 03 00.698 -58 48 36.61 V C57
2019-07-12 00:14:30 s 1 -122704.21 1 +384522.65 4430.0 C57
2019-07-12 00:44:30 S 07 03 01.015 -58 47 27.53 V 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)