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
2019-07-12 13:14:30 s 1 -144383.87 2 +367030.11 9170.0 C57
2019-07-12 13:44:30 S 07 03 05.484 -58 17 13.70 V C57
2019-07-12 13:44:30 s 1 -145179.28 3 +366255.90 3010.0 C57
2019-07-12 14:14:30 S 07 03 05.666 -58 16 02.75 V C57
2019-07-12 14:14:30 s 1 -145971.61 7 +365474.11 1290.0 C57
2019-07-12 14:44:30 S 07 03 05.762 -58 14 53.70 V C57
2019-07-12 14:44:30 s 1 -146760.84 8 +364684.75 3910.0 C57
2019-07-12 15:14:30 S 07 03 05.959 -58 13 45.01 V C57
2019-07-12 15:14:30 s 1 -147546.95 1 +363887.79 790.0 C57
2019-07-12 15:44:30 S 07 03 06.223 -58 12 34.49 V C57
2019-07-12 15:44:30 s 1 -148329.89 7 +363083.24 1840.0 C57
2019-07-12 16:14:30 S 07 03 06.302 -58 11 26.77 V C57
2019-07-12 16:14:30 s 1 -149109.66 1 +362271.08 6970.0 C57
2019-07-12 16:44:30 S 07 03 06.432 -58 10 15.06 V C57
2019-07-12 16:44:30 s 1 -149886.21 5 +361451.31 6080.0 C57
2019-07-12 17:14:30 S 07 03 06.737 -58 09 06.80 V C57
2019-07-12 17:14:30 s 1 -150659.53 3 +360623.91 9080.0 C57
2019-07-12 17:44:30 S 07 03 06.847 -58 07 56.89 V C57
2019-07-12 17:44:30 s 1 -151429.58 8 +359788.89 5880.0 C57
2019-07-12 18:14:30 S 07 03 06.934 -58 06 48.85 V C57
2019-07-12 18:14:30 s 1 -152196.35 1 +358946.23 6400.0 C57
2019-07-12 18:44:30 S 07 03 07.222 -58 05 39.59 V C57
2019-07-12 18:44:30 s 1 -152959.79 5 +358095.92 530.0 C57
2019-07-12 19:14:30 S 07 03 07.399 -58 04 27.73 V C57
2019-07-12 19:14:30 s 1 -153719.89 2 +357237.95 8180.0 C57
2019-07-12 19:44:30 S 07 03 07.452 -58 03 21.13 V C57
2019-07-12 19:44:30 s 1 -154476.61 3 +356372.31 9250.0 C57
2019-07-12 20:14:30 S 07 03 07.721 -58 02 09.71 V C57
2019-07-12 20:14:30 s 1 -155229.93 1 +355499.01 3650.0 C57
2019-07-12 20:44:30 S 07 03 07.942 -58 01 01.70 V C57
2019-07-12 20:44:30 s 1 -155979.81 6 +354618.01 1290.0 C57
2019-07-12 21:14:30 S 07 03 08.002 -57 59 52.04 V C57
2019-07-12 21:14:30 s 1 -156726.24 0 +353729.32 2060.0 C57
2019-07-13 00:14:30 S 07 03 09.101 -57 52 56.93 V C57
2019-07-13 00:14:30 s 1 -161130.43 2 +348235.07 7010.0 C57
2019-07-13 00:44:30 S 07 03 09.168 -57 51 49.43 V C57
2019-07-13 00:44:30 s 1 -161851.79 2 +347292.24 6950.0 C57
2019-07-13 01:14:30 S 07 03 09.461 -57 50 38.72 V C57
2019-07-13 01:14:30 s 1 -162569.44 8 +346341.64 9210.0 C57
2019-07-13 01:44:30 S 07 03 09.650 -57 49 30.32 V C57
2019-07-13 01:44:30 s 1 -163283.37 0 +345383.25 3700.0 C57
2019-07-13 02:14:30 S 07 03 09.696 -57 48 21.31 V C57
2019-07-13 02:14:30 s 1 -163993.52 6 +344417.06 320.0 C57
2019-07-13 02:44:30 S 07 03 09.979 -57 47 11.72 V C57
2019-07-13 02:44:30 s 1 -164699.88 4 +343443.06 8940.0 C57
2019-07-13 03:14:30 S 07 03 10.186 -57 46 02.96 V C57
2019-07-13 03:14:30 s 1 -165402.41 2 +342461.24 9470.0 C57
2019-07-13 03:44:30 S 07 03 10.224 -57 44 52.69 V C57
2019-07-13 03:44:30 s 1 -166101.07 7 +341471.58 1800.0 C57
2019-07-13 05:44:30 S 07 03 10.922 -57 40 21.04 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)