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
2019-06-28 07:14:30 S 06 50 50.268 -74 03 11.02 V C57
2019-06-28 07:14:30 s 1 -154265.12 9 +356352.98 520.0 C57
2019-06-28 07:44:30 S 06 50 51.845 -74 01 30.18 V C57
2019-06-28 07:44:30 s 1 -155040.56 5 +355489.40 4130.0 C57
2019-06-28 08:14:30 S 06 50 53.407 -73 59 46.86 V C57
2019-06-28 08:14:30 s 1 -155812.60 3 +354617.99 1240.0 C57
2019-06-28 08:44:30 S 06 50 55.188 -73 58 06.46 V C57
2019-06-28 08:44:30 s 1 -156581.21 3 +353738.74 1730.0 C57
2019-06-28 09:14:30 S 06 50 56.801 -73 56 21.59 V C57
2019-06-28 09:14:30 s 1 -157346.36 5 +352851.65 5510.0 C57
2019-06-28 09:44:30 S 06 50 58.483 -73 54 41.29 V C57
2019-06-28 09:44:30 s 1 -158108.02 8 +351956.71 2490.0 C57
2019-06-28 10:14:30 S 06 51 00.233 -73 52 57.90 V C57
2019-06-28 10:14:30 s 1 -158866.17 3 +351053.91 2550.0 C57
2019-06-28 10:44:30 S 06 51 01.752 -73 51 17.78 V C57
2019-06-28 10:44:30 s 1 -159620.76 8 +350143.23 5590.0 C57
2019-06-28 11:14:30 S 06 51 03.564 -73 49 32.59 V C57
2019-06-28 11:14:30 s 1 -160371.78 3 +349224.67 1510.0 C57
2019-06-28 11:44:30 S 06 51 05.174 -73 47 51.40 V C57
2019-06-28 11:44:30 s 1 -161119.18 6 +348298.22 210.0 C57
2019-06-28 12:14:30 S 06 51 06.638 -73 46 12.29 V C57
2019-06-28 12:14:30 s 1 -161862.94 5 +347363.87 1570.0 C57
2019-06-28 12:44:30 S 06 51 08.453 -73 44 29.36 V C57
2019-06-28 12:44:30 s 1 -162603.02 8 +346421.61 5500.0 C57
2019-06-28 13:14:30 S 06 51 10.044 -73 42 46.15 V C57
2019-06-28 13:14:30 s 1 -163339.40 4 +345471.43 1890.0 C57
2019-06-28 13:44:30 S 06 51 11.638 -73 41 03.84 V C57
2019-06-28 13:44:30 s 1 -164072.04 0 +344513.31 610.0 C57
2019-06-28 14:14:30 S 06 51 13.457 -73 39 15.59 V C57
2019-06-28 14:14:30 s 1 -164800.90 3 +343547.25 1580.0 C57
2019-06-28 14:44:30 S 06 51 14.887 -73 37 38.78 V C57
2019-06-28 14:44:30 s 1 -165525.96 0 +342573.24 4670.0 C57
2019-06-28 15:14:30 S 06 51 16.601 -73 35 54.35 V C57
2019-06-28 15:14:30 s 1 -166247.17 7 +341591.26 9780.0 C57
2019-06-28 15:44:30 S 06 51 18.151 -73 34 19.38 V C57
2019-06-28 15:44:30 s 1 -166964.52 2 +340601.30 6790.0 C57
2019-06-28 16:14:30 S 06 51 19.699 -73 32 31.67 V C57
2019-06-28 16:14:30 s 1 -167677.96 0 +339603.36 5590.0 C57
2019-06-28 16:44:30 S 06 51 21.475 -73 30 50.11 V C57
2019-06-28 16:44:30 s 1 -168387.45 6 +338597.42 6060.0 C57
2019-06-28 17:14:30 S 06 51 22.994 -73 29 10.43 V C57
2019-06-28 17:14:30 s 1 -169092.97 7 +337583.48 8100.0 C57
2019-06-28 17:44:30 S 06 51 24.478 -73 27 27.68 V C57
2019-06-28 17:44:30 s 1 -169794.48 7 +336561.50 1570.0 C57
2019-06-28 18:14:30 S 06 51 26.194 -73 25 50.99 V C57
2019-06-28 18:14:30 s 1 -170491.95 1 +335531.50 6380.0 C57
2019-06-28 18:44:30 S 06 51 27.725 -73 24 04.50 V C57
2019-06-28 18:44:30 s 1 -171185.33 3 +334493.45 2390.0 C57
2019-06-28 19:14:30 S 06 51 29.270 -73 22 24.56 V C57
2019-06-28 19:14:30 s 1 -171874.59 8 +333447.35 9480.0 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)