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
2019-06-27 03:44:30 S 06 49 08.801 -75 37 57.97 V C57
2019-06-27 03:44:30 s 1 -107166.87 7 +392005.19 5970.0 C57
2019-06-27 04:14:30 S 06 49 10.750 -75 36 11.74 V C57
2019-06-27 04:14:30 s 1 -108089.14 1 +391562.07 1170.0 C57
2019-06-27 04:44:30 S 06 49 12.874 -75 34 27.41 V C57
2019-06-27 04:44:30 s 1 -109009.36 1 +391111.41 4520.0 C57
2019-06-27 05:14:30 S 06 49 14.803 -75 32 43.87 V C57
2019-06-27 05:14:30 s 1 -109927.51 5 +390653.22 5930.0 C57
2019-06-27 05:44:30 S 06 49 16.807 -75 30 57.24 V C57
2019-06-27 05:44:30 s 1 -110843.58 2 +390187.49 5330.0 C57
2019-06-27 06:14:30 S 06 49 18.828 -75 29 17.48 V C57
2019-06-27 06:14:30 s 1 -111757.54 1 +389714.21 2650.0 C57
2019-06-27 07:14:30 S 06 49 22.716 -75 25 49.98 V C57
2019-06-27 07:14:30 s 1 -113579.05 1 +388745.04 730.0 C57
2019-06-27 07:44:30 S 06 49 24.727 -75 24 07.88 V C57
2019-06-27 07:44:30 s 1 -114486.55 8 +388249.13 1340.0 C57
2019-06-27 08:14:30 S 06 49 26.609 -75 22 19.78 V C57
2019-06-27 08:14:30 s 1 -115391.87 2 +387745.66 9560.0 C57
2019-06-27 08:44:30 S 06 49 28.726 -75 20 34.76 V C57
2019-06-27 08:44:30 s 1 -116294.97 1 +387234.65 5310.0 C57
2019-06-27 09:44:30 S 06 49 32.491 -75 17 06.90 V C57
2019-06-27 09:44:30 s 1 -118094.43 4 +386189.95 9130.0 C57
2019-06-27 11:44:30 S 06 49 40.277 -75 10 14.45 V C57
2019-06-27 11:44:30 s 1 -121665.81 3 +384009.78 3810.0 C57
2019-06-27 12:14:30 S 06 49 42.098 -75 08 32.24 V C57
2019-06-27 12:14:30 s 1 -122552.78 8 +383445.81 160.0 C57
2019-06-27 12:44:30 S 06 49 43.963 -75 06 46.26 V C57
2019-06-27 12:44:30 s 1 -123437.37 0 +382874.25 3430.0 C57
2019-06-27 13:14:30 S 06 49 45.926 -75 05 05.39 V C57
2019-06-27 13:14:30 s 1 -124319.53 7 +382295.12 3530.0 C57
2019-06-27 13:44:30 S 06 49 47.863 -75 03 15.44 V C57
2019-06-27 13:44:30 s 1 -125199.26 5 +381708.40 390.0 C57
2019-06-27 14:14:30 S 06 49 49.754 -75 01 32.12 V C57
2019-06-27 14:14:30 s 1 -126076.53 3 +381114.08 3930.0 C57
2019-06-27 14:44:30 S 06 49 51.713 -74 59 49.45 V C57
2019-06-27 14:44:30 s 1 -126951.31 5 +380512.17 4070.0 C57
2019-06-27 15:14:30 S 06 49 53.436 -74 58 05.23 V C57
2019-06-27 15:14:30 s 1 -127823.59 0 +379902.66 720.0 C57
2019-06-27 15:44:30 S 06 49 55.337 -74 56 26.59 V C57
2019-06-27 15:44:30 s 1 -128693.33 4 +379285.55 3810.0 C57
2019-06-27 16:14:30 S 06 49 57.319 -74 54 36.72 V C57
2019-06-27 16:14:30 s 1 -129560.52 4 +378660.83 3250.0 C57
2019-06-27 16:44:30 S 06 49 58.982 -74 52 53.90 V C57
2019-06-27 16:44:30 s 1 -130425.13 5 +378028.49 8970.0 C57
2019-06-27 17:14:30 S 06 50 00.996 -74 51 10.44 V C57
2019-06-27 17:14:30 s 1 -131287.14 3 +377388.54 880.0 C57
2019-06-27 17:44:30 S 06 50 02.863 -74 49 24.24 V C57
2019-06-27 17:44:30 s 1 -132146.52 6 +376740.96 8900.0 C57
2019-06-27 18:14:30 S 06 50 04.423 -74 47 47.33 V C57
2019-06-27 18:14:30 s 1 -133003.25 9 +376085.76 2950.0 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)