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
2019-06-26 14:14:30 S 06 48 10.853 -76 25 06.38 V C57
2019-06-26 14:14:30 s 1 -81567.279 0 +401124.27 280.0 C57
2019-06-26 14:44:30 S 06 48 13.214 -76 23 19.39 V C57
2019-06-26 14:44:30 s 1 -82537.108 0 +400884.37 2420.0 C57
2019-06-26 15:44:30 S 06 48 17.602 -76 19 52.75 V C57
2019-06-26 15:44:30 s 1 -84472.226 0 +400381.99 6480.0 C57
2019-06-26 16:14:30 S 06 48 19.922 -76 18 06.62 V C57
2019-06-26 16:14:30 s 1 -85437.478 0 +400119.50 8550.0 C57
2019-06-26 16:44:30 S 06 48 21.960 -76 16 20.89 V C57
2019-06-26 16:44:30 s 1 -86401.165 0 +399849.48 730.0 C57
2019-06-26 17:14:30 S 06 48 24.331 -76 14 34.91 V C57
2019-06-26 17:14:30 s 1 -87363.269 0 +399571.93 3110.0 C57
2019-06-26 17:44:30 S 06 48 26.597 -76 12 46.87 V C57
2019-06-26 17:44:30 s 1 -88323.770 0 +399286.86 5740.0 C57
2019-06-26 18:14:30 S 06 48 28.567 -76 11 05.39 V C57
2019-06-26 18:14:30 s 1 -89282.649 0 +398994.26 8710.0 C57
2019-06-26 18:44:30 S 06 48 30.917 -76 09 21.42 V C57
2019-06-26 18:44:30 s 1 -90239.886 0 +398694.13 2070.0 C57
2019-06-26 19:14:30 S 06 48 33.101 -76 07 35.98 V C57
2019-06-26 19:14:30 s 1 -91195.462 0 +398386.48 4080.0 C57
2019-06-26 19:44:30 S 06 48 35.102 -76 05 50.57 V C57
2019-06-26 19:44:30 s 1 -92149.357 0 +398071.31 9690.0 C57
2019-06-26 20:44:30 S 06 48 39.612 -76 02 17.12 V C57
2019-06-26 20:44:30 s 1 -94052.026 0 +397418.38 8970.0 C57
2019-06-26 21:14:30 S 06 48 41.705 -76 00 30.24 V C57
2019-06-26 21:14:30 s 1 -95000.761 0 +397080.64 2510.0 C57
2019-06-26 21:44:30 S 06 48 43.802 -75 58 53.87 V C57
2019-06-26 21:44:30 s 1 -95947.736 0 +396735.37 5200.0 C57
2019-06-26 22:14:30 S 06 48 45.914 -75 57 06.59 V C57
2019-06-26 22:14:30 s 1 -96892.931 0 +396382.58 7000.0 C57
2019-06-26 22:44:30 S 06 48 48.053 -75 55 22.01 V C57
2019-06-26 22:44:30 s 1 -97836.327 0 +396022.26 7810.0 C57
2019-06-26 23:14:30 S 06 48 50.316 -75 53 32.64 V C57
2019-06-26 23:14:30 s 1 -98777.904 0 +395654.42 7560.0 C57
2019-06-26 23:44:30 S 06 48 52.279 -75 51 47.88 V C57
2019-06-26 23:44:30 s 1 -99717.641 0 +395279.06 6190.0 C57
2019-06-27 00:14:30 S 06 48 54.329 -75 50 09.82 V C57
2019-06-27 00:14:30 s 1 -100655.51 8 +394896.17 3630.0 C57
2019-06-27 00:44:30 S 06 48 56.479 -75 48 23.15 V C57
2019-06-27 00:44:30 s 1 -101591.51 5 +394505.76 9790.0 C57
2019-06-27 01:14:30 S 06 48 58.325 -75 46 43.32 V C57
2019-06-27 01:14:30 s 1 -102525.61 2 +394107.82 4610.0 C57
2019-06-27 01:44:30 S 06 49 00.696 -75 44 50.93 V C57
2019-06-27 01:44:30 s 1 -103457.78 9 +393702.35 8010.0 C57
2019-06-27 02:14:30 S 06 49 02.688 -75 43 07.46 V C57
2019-06-27 02:14:30 s 1 -104388.02 4 +393289.36 9920.0 C57
2019-06-27 02:44:30 S 06 49 04.601 -75 41 23.46 V C57
2019-06-27 02:44:30 s 1 -105316.29 8 +392868.83 260.0 C57
2019-06-27 03:14:30 S 06 49 06.905 -75 39 34.63 V C57
2019-06-27 03:14:30 s 1 -106242.58 9 +392440.78 8970.0 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)