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
2019-07-08 06:14:30 S 07 02 17.335 -62 24 30.02 V C57
2019-07-08 06:14:30 s 1 +54353.094 0 +365787.29 3310.0 C57
2019-07-08 06:44:30 S 07 02 17.590 -62 23 16.66 V C57
2019-07-08 06:44:30 s 1 +53359.706 0 +366613.84 5440.0 C57
2019-07-08 07:14:30 S 07 02 18.127 -62 22 00.08 V C57
2019-07-08 07:14:30 s 1 +52365.038 0 +367431.35 5700.0 C57
2019-07-08 07:44:30 S 07 02 18.396 -62 20 50.03 V C57
2019-07-08 07:44:30 s 1 +51369.122 0 +368239.85 4230.0 C57
2019-07-08 08:14:30 S 07 02 18.650 -62 19 33.17 V C57
2019-07-08 08:14:30 s 1 +50371.988 0 +369039.36 1150.0 C57
2019-07-08 08:44:30 S 07 02 19.142 -62 18 21.49 V C57
2019-07-08 08:44:30 s 1 +49373.668 0 +369829.91 6610.0 C57
2019-07-08 09:14:30 S 07 02 19.440 -62 17 06.29 V C57
2019-07-08 09:14:30 s 1 +48374.191 0 +370611.53 730.0 C57
2019-07-08 09:44:30 S 07 02 19.685 -62 15 52.49 V C57
2019-07-08 09:44:30 s 1 +47373.588 0 +371384.23 3660.0 C57
2019-07-08 10:14:30 S 07 02 20.177 -62 14 40.52 V C57
2019-07-08 10:14:30 s 1 +46371.889 0 +372148.05 5520.0 C57
2019-07-08 10:44:30 S 07 02 20.462 -62 13 24.35 V C57
2019-07-08 10:44:30 s 1 +45369.123 0 +372903.00 6430.0 C57
2019-07-08 11:14:30 S 07 02 20.695 -62 12 14.15 V C57
2019-07-08 11:14:30 s 1 +44365.319 0 +373649.11 6540.0 C57
2019-07-08 11:44:30 S 07 02 20.986 -62 10 57.50 V C57
2019-07-08 11:44:30 s 1 +43360.507 0 +374386.41 5950.0 C57
2019-07-08 13:14:30 S 07 02 21.199 -62 07 26.54 V C57
2019-07-08 13:14:30 s 1 +40340.301 0 +376545.63 1350.0 C57
2019-07-08 14:44:30 S 07 02 23.815 -62 03 34.42 V C57
2019-07-08 14:44:30 s 1 +37312.033 0 +378626.34 5020.0 C57
2019-07-08 15:14:30 S 07 02 23.832 -62 02 20.98 V C57
2019-07-08 15:14:30 s 1 +36300.947 0 +379302.56 3100.0 C57
2019-07-08 15:44:30 S 07 02 23.784 -62 01 10.09 V C57
2019-07-08 15:44:30 s 1 +35289.074 0 +379970.15 1460.0 C57
2019-07-08 16:14:30 S 07 02 24.170 -61 59 56.65 V C57
2019-07-08 16:14:30 s 1 +34276.441 0 +380629.12 220.0 C57
2019-07-08 16:44:30 S 07 02 24.418 -61 58 41.45 V C57
2019-07-08 16:44:30 s 1 +33263.074 0 +381279.49 9510.0 C57
2019-07-08 17:14:30 S 07 02 24.610 -61 57 30.17 V C57
2019-07-08 17:14:30 s 1 +32249.000 0 +381921.30 9430.0 C57
2019-07-08 17:44:30 S 07 02 25.111 -61 56 14.46 V C57
2019-07-08 17:44:30 s 1 +31234.244 0 +382554.55 110.0 C57
2019-07-08 18:14:30 S 07 02 25.351 -61 55 02.24 V C57
2019-07-08 18:14:30 s 1 +30218.833 0 +383179.27 1640.0 C57
2019-07-08 18:44:30 S 07 02 25.579 -61 53 49.88 V C57
2019-07-08 18:44:30 s 1 +29202.792 0 +383795.47 4150.0 C57
2019-07-08 19:14:30 S 07 02 26.042 -61 52 34.07 V C57
2019-07-08 19:14:30 s 1 +28186.146 0 +384403.19 7740.0 C57
2019-07-08 19:44:30 S 07 02 26.318 -61 51 23.87 V C57
2019-07-08 19:44:30 s 1 +27168.921 0 +385002.43 2530.0 C57
2019-07-08 20:14:30 S 07 02 26.494 -61 50 08.09 V C57
2019-07-08 20:14:30 s 1 +26151.140 0 +385593.22 8620.0 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)