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
2019-07-14 12:44:30 s 1 -201689.36 0 +258100.62 4040.0 C57
2019-07-14 13:14:30 S 07 03 22.670 -56 28 30.50 V C57
2019-07-14 13:14:30 s 1 -202032.23 3 +256550.28 9170.0 C57
2019-07-14 14:14:30 S 07 03 22.963 -56 26 15.65 V C57
2019-07-14 14:14:30 s 1 -202696.22 1 +253422.39 1580.0 C57
2019-07-14 14:44:30 S 07 03 23.290 -56 25 07.18 V C57
2019-07-14 14:44:30 s 1 -203017.18 3 +251844.81 8360.0 C57
2019-07-14 15:14:30 S 07 03 23.501 -56 24 00.32 V C57
2019-07-14 15:14:30 s 1 -203330.68 6 +250258.09 5190.0 C57
2019-07-14 15:44:30 S 07 03 23.609 -56 22 52.46 V C57
2019-07-14 15:44:30 s 1 -203636.65 1 +248662.22 1800.0 C57
2019-07-14 16:14:30 S 07 03 23.875 -56 21 44.60 V C57
2019-07-14 16:14:30 s 1 -203934.99 9 +247057.16 7920.0 C57
2019-07-14 16:44:30 S 07 03 24.113 -56 20 35.92 V C57
2019-07-14 16:44:30 s 1 -204225.64 7 +245442.90 3310.0 C57
2019-07-14 17:14:30 S 07 03 24.216 -56 19 28.81 V C57
2019-07-14 17:14:30 s 1 -204508.51 2 +243819.41 7670.0 C57
2019-07-14 18:14:30 S 07 03 24.871 -56 17 13.78 V C57
2019-07-14 18:14:30 s 1 -205050.55 8 +240544.61 2240.0 C57
2019-07-14 18:44:30 S 07 03 24.866 -56 16 07.25 V C57
2019-07-14 18:44:30 s 1 -205309.56 6 +238893.26 1870.0 C57
2019-07-14 19:14:30 S 07 03 25.210 -56 14 56.94 V C57
2019-07-14 19:14:30 s 1 -205560.44 7 +237232.57 9350.0 C57
2019-07-14 19:44:30 S 07 03 25.397 -56 13 50.92 V C57
2019-07-14 19:44:30 s 1 -205803.11 0 +235562.51 4390.0 C57
2019-07-14 20:14:30 S 07 03 25.517 -56 12 41.80 V C57
2019-07-14 20:14:30 s 1 -206037.46 5 +233883.06 6680.0 C57
2019-07-14 20:44:30 S 07 03 25.891 -56 11 34.73 V C57
2019-07-14 20:44:30 s 1 -206263.41 9 +232194.19 5910.0 C57
2019-07-14 21:14:30 S 07 03 26.045 -56 10 27.41 V C57
2019-07-14 21:14:30 s 1 -206480.87 7 +230495.88 1790.0 C57
2019-07-14 21:44:30 S 07 03 26.234 -56 09 18.72 V C57
2019-07-14 21:44:30 s 1 -206689.74 4 +228788.08 3980.0 C57
2019-07-14 22:14:30 S 07 03 26.513 -56 08 12.48 V C57
2019-07-14 22:14:30 s 1 -206889.92 2 +227070.79 2180.0 C57
2019-07-14 22:44:30 S 07 03 26.645 -56 07 03.79 V C57
2019-07-14 22:44:30 s 1 -207081.31 3 +225343.96 6050.0 C57
2019-07-14 23:14:30 S 07 03 26.921 -56 05 57.59 V C57
2019-07-14 23:14:30 s 1 -207263.81 4 +223607.58 5260.0 C57
2019-07-14 23:44:30 S 07 03 27.293 -56 04 48.83 V C57
2019-07-14 23:44:30 s 1 -207437.32 4 +221861.60 9470.0 C57
2019-07-15 00:14:30 S 07 03 27.430 -56 03 41.36 V C57
2019-07-15 00:14:30 s 1 -207601.73 9 +220106.02 8340.0 C57
2019-07-15 00:44:30 S 07 03 27.598 -56 02 35.09 V C57
2019-07-15 00:44:30 s 1 -207756.95 2 +218340.79 1520.0 C57
2019-07-15 01:14:30 S 07 03 27.919 -56 01 25.32 V C57
2019-07-15 01:14:30 s 1 -207902.85 5 +216565.88 8640.0 C57
2019-07-15 01:44:30 S 07 03 28.046 -56 00 20.23 V C57
2019-07-15 01:44:30 s 1 -208039.33 8 +214781.28 9340.0 C57
2019-07-15 02:14:30 S 07 03 28.349 -55 59 10.86 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)