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
2019-07-13 20:14:30 s 1 -186755.65 5 +304332.62 5550.0 C57
2019-07-13 20:44:30 S 07 03 16.342 -57 05 58.52 V C57
2019-07-13 20:44:30 s 1 -187300.96 7 +303068.50 6600.0 C57
2019-07-13 21:14:30 S 07 03 16.409 -57 04 51.06 V C57
2019-07-13 21:14:30 s 1 -187841.03 0 +301796.03 4910.0 C57
2019-07-13 21:44:30 S 07 03 16.627 -57 03 41.51 V C57
2019-07-13 21:44:30 s 1 -188375.79 7 +300515.19 320.0 C57
2019-07-14 00:14:30 S 07 03 17.544 -56 58 00.23 V C57
2019-07-14 00:14:30 s 1 -190968.45 4 +293984.82 8160.0 C57
2019-07-14 00:44:30 S 07 03 17.690 -56 56 53.88 V C57
2019-07-14 00:44:30 s 1 -191470.39 5 +292653.38 2740.0 C57
2019-07-14 01:14:30 S 07 03 17.962 -56 55 43.46 V C57
2019-07-14 01:14:30 s 1 -191966.68 4 +291313.43 3260.0 C57
2019-07-14 01:44:30 S 07 03 18.146 -56 54 37.22 V C57
2019-07-14 01:44:30 s 1 -192457.26 9 +289964.97 9540.0 C57
2019-07-14 02:14:30 S 07 03 18.264 -56 53 27.85 V C57
2019-07-14 02:14:30 s 1 -192942.09 5 +288607.97 1420.0 C57
2019-07-14 02:44:30 S 07 03 18.574 -56 52 19.42 V C57
2019-07-14 02:44:30 s 1 -193421.10 8 +287242.41 8710.0 C57
2019-07-14 03:14:30 S 07 03 18.722 -56 51 12.02 V C57
2019-07-14 03:14:30 s 1 -193894.25 2 +285868.26 1230.0 C57
2019-07-14 03:44:30 S 07 03 18.840 -56 50 03.16 V C57
2019-07-14 03:44:30 s 1 -194361.47 1 +284485.52 8800.0 C57
2019-07-14 04:14:30 S 07 03 19.150 -56 48 56.45 V C57
2019-07-14 04:14:30 s 1 -194822.70 7 +283094.15 1230.0 C57
2019-07-14 05:44:30 S 07 03 19.716 -56 45 29.81 V C57
2019-07-14 05:44:30 s 1 -196169.94 4 +278868.10 5830.0 C57
2019-07-14 06:14:30 S 07 03 19.882 -56 44 22.63 V C57
2019-07-14 06:14:30 s 1 -196606.66 8 +277442.03 5810.0 C57
2019-07-14 07:44:30 S 07 03 20.467 -56 40 58.48 V C57
2019-07-14 07:44:30 s 1 -197878.92 0 +273111.37 8340.0 C57
2019-07-14 08:14:30 S 07 03 20.549 -56 39 49.86 V C57
2019-07-14 08:14:30 s 1 -198290.15 6 +271650.25 2690.0 C57
2019-07-14 08:44:30 S 07 03 20.880 -56 38 43.01 V C57
2019-07-14 08:44:30 s 1 -198694.86 1 +270180.32 120.0 C57
2019-07-14 09:14:30 S 07 03 21.082 -56 37 34.21 V C57
2019-07-14 09:14:30 s 1 -199092.97 0 +268701.55 410.0 C57
2019-07-14 09:44:30 S 07 03 21.156 -56 36 26.03 V C57
2019-07-14 09:44:30 s 1 -199484.41 7 +267213.91 3350.0 C57
2019-07-14 10:14:30 S 07 03 21.468 -56 35 19.00 V C57
2019-07-14 10:14:30 s 1 -199869.13 5 +265717.38 8720.0 C57
2019-07-14 10:44:30 S 07 03 21.672 -56 34 08.98 V C57
2019-07-14 10:44:30 s 1 -200247.05 4 +264211.95 6290.0 C57
2019-07-14 11:14:30 S 07 03 21.756 -56 33 03.56 V C57
2019-07-14 11:14:30 s 1 -200618.10 8 +262697.58 5830.0 C57
2019-07-14 11:44:30 S 07 03 22.044 -56 31 54.73 V C57
2019-07-14 11:44:30 s 1 -200982.22 4 +261174.25 7130.0 C57
2019-07-14 12:14:30 S 07 03 22.255 -56 30 46.37 V C57
2019-07-14 12:14:30 s 1 -201339.33 2 +259641.94 9940.0 C57
2019-07-14 12:44:30 S 07 03 22.337 -56 29 40.27 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)