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
2019-06-22 06:14:30 s 1 +120686.80 2 +272438.28 6400.0 C57
2019-06-22 06:44:30 S 06 33 05.926 -82 38 15.32 V C57
2019-06-22 06:44:30 s 1 +119924.44 9 +274055.96 3880.0 C57
2019-06-22 07:14:30 S 06 33 14.390 -82 36 26.53 V C57
2019-06-22 07:14:30 s 1 +119156.67 6 +275661.48 770.0 C57
2019-06-22 07:44:30 S 06 33 23.453 -82 34 33.20 V C57
2019-06-22 07:44:30 s 1 +118383.57 1 +277254.91 7460.0 C57
2019-06-22 08:14:30 S 06 33 30.943 -82 32 51.22 V C57
2019-06-22 08:14:30 s 1 +117605.22 5 +278836.31 4360.0 C57
2019-06-22 08:44:30 S 06 33 40.133 -82 30 50.11 V C57
2019-06-22 08:44:30 s 1 +116821.72 5 +280405.72 1860.0 C57
2019-06-22 09:14:30 S 06 33 48.240 -82 29 07.87 V C57
2019-06-22 09:14:30 s 1 +116033.15 7 +281963.22 330.0 C57
2019-06-22 09:44:30 S 06 33 56.674 -82 27 12.10 V C57
2019-06-22 09:44:30 s 1 +115239.60 5 +283508.85 170.0 C57
2019-06-22 10:14:30 S 06 34 04.210 -82 25 28.13 V C57
2019-06-22 10:14:30 s 1 +114441.15 3 +285042.67 1730.0 C57
2019-06-22 10:44:30 S 06 34 12.552 -82 23 39.05 V C57
2019-06-22 10:44:30 s 1 +113637.88 1 +286564.75 5380.0 C57
2019-06-22 11:14:30 S 06 34 20.446 -82 21 46.37 V C57
2019-06-22 11:14:30 s 1 +112829.87 0 +288075.12 1490.0 C57
2019-06-22 11:44:30 S 06 34 28.291 -82 19 56.10 V C57
2019-06-22 11:44:30 s 1 +112017.19 9 +289573.86 400.0 C57
2019-06-22 12:14:30 S 06 34 36.437 -82 18 06.73 V C57
2019-06-22 12:14:30 s 1 +111199.94 4 +291061.00 2460.0 C57
2019-06-22 12:44:30 S 06 34 43.889 -82 16 16.32 V C57
2019-06-22 12:44:30 s 1 +110378.18 3 +292536.61 8020.0 C57
2019-06-22 13:14:30 S 06 34 51.386 -82 14 27.82 V C57
2019-06-22 13:14:30 s 1 +109551.98 9 +294000.74 7400.0 C57
2019-06-22 14:14:30 S 06 35 07.025 -82 10 43.32 V C57
2019-06-22 14:14:30 s 1 +107886.59 6 +296894.76 8970.0 C57
2019-06-22 14:44:30 S 06 35 14.177 -82 08 57.16 V C57
2019-06-22 14:44:30 s 1 +107047.54 1 +298324.75 1810.0 C57
2019-06-22 15:14:30 S 06 35 22.234 -82 07 02.39 V C57
2019-06-22 15:14:30 s 1 +106204.34 0 +299743.46 9760.0 C57
2019-06-22 15:44:30 S 06 35 29.006 -82 05 18.24 V C57
2019-06-22 15:44:30 s 1 +105357.06 2 +301150.95 3150.0 C57
2019-06-22 16:14:30 S 06 35 36.463 -82 03 24.19 V C57
2019-06-22 16:14:30 s 1 +104505.77 5 +302547.25 2270.0 C57
2019-06-22 16:44:30 S 06 35 43.901 -82 01 35.98 V C57
2019-06-22 16:44:30 s 1 +103650.54 5 +303932.43 7420.0 C57
2019-06-22 17:14:30 S 06 35 50.774 -81 59 45.78 V C57
2019-06-22 17:14:30 s 1 +102791.43 7 +305306.53 8910.0 C57
2019-06-22 17:44:30 S 06 35 57.835 -81 57 57.64 V C57
2019-06-22 17:44:30 s 1 +101928.51 7 +306669.59 7020.0 C57
2019-06-22 18:14:30 S 06 36 05.717 -81 55 59.09 V C57
2019-06-22 18:14:30 s 1 +101061.84 8 +308021.66 2040.0 C57
2019-06-22 18:44:30 S 06 36 11.863 -81 54 18.54 V C57
2019-06-22 18:44:30 s 1 +100191.49 1 +309362.79 4250.0 C57
2019-06-22 19:14:30 S 06 36 19.118 -81 52 21.86 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)