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
2019-07-01 02:44:30 s 1 -210652.34 0 +163358.43 1310.0 C57
2019-07-01 03:14:30 S 06 54 11.885 -70 16 04.22 V C57
2019-07-01 03:14:30 s 1 -210498.50 3 +161296.50 8550.0 C57
2019-07-01 03:44:30 S 06 54 13.471 -70 14 25.91 V C57
2019-07-01 03:44:30 s 1 -210331.20 4 +159224.28 4750.0 C57
2019-07-01 04:14:30 S 06 54 14.854 -70 12 46.37 V C57
2019-07-01 04:14:30 s 1 -210150.25 6 +157141.75 9270.0 C57
2019-07-01 04:44:30 S 06 54 16.318 -70 11 09.06 V C57
2019-07-01 04:44:30 s 1 -209955.46 8 +155048.90 1410.0 C57
2019-07-01 05:14:30 S 06 54 17.662 -70 09 37.08 V C57
2019-07-01 05:14:30 s 1 -209746.64 6 +152945.70 480.0 C57
2019-07-01 05:44:30 S 06 54 19.097 -70 07 52.00 V C57
2019-07-01 05:44:30 s 1 -209523.59 1 +150832.16 5770.0 C57
2019-07-01 06:14:30 S 06 54 20.501 -70 06 20.41 V C57
2019-07-01 06:14:30 s 1 -209286.10 2 +148708.24 6550.0 C57
2019-07-01 06:44:30 S 06 54 21.850 -70 04 39.07 V C57
2019-07-01 06:44:30 s 1 -209033.97 0 +146573.95 2080.0 C57
2019-07-01 07:14:30 S 06 54 23.458 -70 02 58.60 V C57
2019-07-01 07:14:30 s 1 -208766.98 4 +144429.26 1600.0 C57
2019-07-01 07:44:30 S 06 54 24.758 -70 01 24.64 V C57
2019-07-01 07:44:30 s 1 -208484.92 8 +142274.17 4320.0 C57
2019-07-01 08:14:30 S 06 54 26.335 -69 59 44.30 V C57
2019-07-01 08:14:30 s 1 -208187.58 1 +140108.67 9460.0 C57
2019-07-01 08:44:30 S 06 54 27.662 -69 58 09.98 V C57
2019-07-01 08:44:30 s 1 -207874.71 8 +137932.75 6190.0 C57
2019-07-01 09:14:30 S 06 54 29.299 -69 56 26.84 V C57
2019-07-01 09:14:30 s 1 -207546.10 6 +135746.40 3680.0 C57
2019-07-01 09:44:30 S 06 54 30.574 -69 54 54.29 V C57
2019-07-01 09:44:30 s 1 -207201.51 2 +133549.62 1080.0 C57
2019-07-01 10:44:30 S 06 54 33.502 -69 51 35.14 V C57
2019-07-01 10:44:30 s 1 -206463.40 1 +129124.74 2060.0 C57
2019-07-01 11:14:30 S 06 54 35.018 -69 49 55.27 V C57
2019-07-01 11:14:30 s 1 -206069.38 5 +126896.64 3820.0 C57
2019-07-01 11:44:30 S 06 54 36.466 -69 48 17.89 V C57
2019-07-01 11:44:30 s 1 -205658.38 7 +124658.11 1860.0 C57
2019-07-01 12:14:30 S 06 54 37.872 -69 46 43.25 V C57
2019-07-01 12:14:30 s 1 -205230.14 2 +122409.14 5200.0 C57
2019-07-01 12:44:30 S 06 54 39.475 -69 45 00.25 V C57
2019-07-01 12:44:30 s 1 -204784.38 1 +120149.73 2850.0 C57
2019-07-01 13:14:30 S 06 54 40.853 -69 43 27.73 V C57
2019-07-01 13:14:30 s 1 -204320.82 5 +117879.91 3810.0 C57
2019-07-01 13:44:30 S 06 54 42.398 -69 41 48.91 V C57
2019-07-01 13:44:30 s 1 -203839.19 2 +115599.68 7020.0 C57
2019-07-01 14:14:30 S 06 54 43.879 -69 40 08.47 V C57
2019-07-01 14:14:30 s 1 -203339.19 2 +113309.04 1420.0 C57
2019-07-01 14:44:30 S 06 54 45.360 -69 38 35.41 V C57
2019-07-01 14:44:30 s 1 -202820.52 7 +111008.03 5920.0 C57
2019-07-01 15:14:30 S 06 54 46.714 -69 36 57.92 V C57
2019-07-01 15:14:30 s 1 -202282.89 3 +108696.64 9390.0 C57
2019-07-01 16:14:30 S 06 54 49.714 -69 33 41.44 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)