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
2019-07-05 23:44:30 S 07 01 20.141 -64 40 30.68 V C57
2019-07-05 23:44:30 s 1 +144646.13 8 +213557.62 330.0 C57
2019-07-06 00:14:30 S 07 01 20.765 -64 39 16.92 V C57
2019-07-06 00:14:30 s 1 +144120.18 5 +215609.00 8430.0 C57
2019-07-06 00:44:30 S 07 01 21.662 -64 38 00.96 V C57
2019-07-06 00:44:30 s 1 +143584.62 2 +217645.98 9740.0 C57
2019-07-06 01:14:30 S 07 01 22.378 -64 36 45.54 V C57
2019-07-06 01:14:30 s 1 +143039.62 8 +219668.65 4970.0 C57
2019-07-06 02:14:30 S 07 01 23.923 -64 34 11.24 V C57
2019-07-06 02:14:30 s 1 +141922.03 8 +223671.38 9990.0 C57
2019-07-06 02:44:30 S 07 01 24.514 -64 32 59.21 V C57
2019-07-06 02:44:30 s 1 +141349.77 9 +225651.60 1150.0 C57
2019-07-06 03:14:30 S 07 01 25.435 -64 31 41.05 V C57
2019-07-06 03:14:30 s 1 +140768.76 3 +227617.81 8940.0 C57
2019-07-06 03:44:30 S 07 01 25.990 -64 30 27.97 V C57
2019-07-06 03:44:30 s 1 +140179.15 0 +229570.11 4030.0 C57
2019-07-06 04:14:30 S 07 01 26.863 -64 29 11.22 V C57
2019-07-06 04:14:30 s 1 +139581.09 3 +231508.57 7030.0 C57
2019-07-06 04:44:30 S 07 01 27.499 -64 27 54.11 V C57
2019-07-06 04:44:30 s 1 +138974.74 7 +233433.26 8580.0 C57
2019-07-06 05:14:30 S 07 01 28.166 -64 26 41.39 V C57
2019-07-06 05:14:30 s 1 +138360.26 0 +235344.25 9270.0 C57
2019-07-06 05:44:30 S 07 01 28.973 -64 25 22.30 V C57
2019-07-06 05:44:30 s 1 +137737.77 8 +237241.63 9710.0 C57
2019-07-06 06:14:30 S 07 01 29.520 -64 24 10.91 V C57
2019-07-06 06:14:30 s 1 +137107.44 3 +239125.47 470.0 C57
2019-07-06 06:44:30 S 07 01 30.372 -64 22 52.43 V C57
2019-07-06 06:44:30 s 1 +136469.39 6 +240995.83 2120.0 C57
2019-07-06 07:14:30 S 07 01 30.960 -64 21 38.20 V C57
2019-07-06 07:14:30 s 1 +135823.77 3 +242852.80 5220.0 C57
2019-07-06 07:44:30 S 07 01 31.774 -64 20 22.52 V C57
2019-07-06 07:44:30 s 1 +135170.70 8 +244696.43 330.0 C57
2019-07-06 08:14:30 S 07 01 32.393 -64 19 05.34 V C57
2019-07-06 08:14:30 s 1 +134510.33 3 +246526.82 7970.0 C57
2019-07-06 08:44:30 S 07 01 32.921 -64 17 53.66 V C57
2019-07-06 08:44:30 s 1 +133842.77 5 +248344.01 8680.0 C57
2019-07-06 09:14:30 S 07 01 33.946 -64 16 31.62 V C57
2019-07-06 09:14:30 s 1 +133168.16 1 +250148.10 2980.0 C57
2019-07-06 10:14:30 S 07 01 35.040 -64 14 06.11 V C57
2019-07-06 10:14:30 s 1 +131798.25 4 +253717.19 4340.0 C57
2019-07-06 10:44:30 S 07 01 35.628 -64 12 49.00 V C57
2019-07-06 10:44:30 s 1 +131103.20 1 +255482.33 2390.0 C57
2019-07-06 11:14:30 S 07 01 36.175 -64 11 35.81 V C57
2019-07-06 11:14:30 s 1 +130401.57 0 +257234.64 6000.0 C57
2019-07-06 11:44:30 S 07 01 37.003 -64 10 15.82 V C57
2019-07-06 11:44:30 s 1 +129693.47 5 +258974.16 5640.0 C57
2019-07-06 12:44:30 S 07 01 38.261 -64 07 47.64 V C57
2019-07-06 12:44:30 s 1 +128258.33 6 +262415.14 4840.0 C57
2019-07-06 13:14:30 S 07 01 38.822 -64 06 32.80 V C57
2019-07-06 13:14:30 s 1 +127531.51 0 +264116.72 5300.0 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)