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 16:14:30 s 1 -201149.46 5 +104042.86 8600.0 C57
2019-07-01 16:44:30 S 06 54 51.312 -69 32 06.50 V C57
2019-07-01 16:44:30 s 1 -200553.02 4 +101700.52 1940.0 C57
2019-07-01 17:14:30 S 06 54 52.644 -69 30 29.30 V C57
2019-07-01 17:14:30 s 1 -199936.32 0 +99347.916 9460.0 C57
2019-07-01 17:44:30 S 06 54 54.353 -69 28 48.04 V C57
2019-07-01 17:44:30 s 1 -199299.01 1 +96985.084 9860.0 C57
2019-07-01 18:14:30 S 06 54 55.658 -69 27 15.84 V C57
2019-07-01 18:14:30 s 1 -198640.74 3 +94612.065 1840.0 C57
2019-07-01 18:44:30 S 06 54 57.374 -69 25 33.67 V C57
2019-07-01 18:44:30 s 1 -197961.15 4 +92228.903 4040.0 C57
2019-07-01 19:14:30 S 06 54 58.754 -69 23 58.88 V C57
2019-07-01 19:14:30 s 1 -197259.87 6 +89835.646 5070.0 C57
2019-07-01 19:44:30 S 06 55 00.418 -69 22 21.61 V C57
2019-07-01 19:44:30 s 1 -196536.52 6 +87432.347 3500.0 C57
2019-07-01 19:45:26 S 06 56 28.982 -69 17 32.71 L C51
2019-07-01 20:14:30 S 06 55 01.838 -69 20 42.65 V C57
2019-07-01 20:14:30 s 1 -195790.71 7 +85019.067 7870.0 C57
2019-07-01 20:44:30 S 06 55 03.470 -69 19 07.68 V C57
2019-07-01 20:44:30 s 1 -195022.04 6 +82595.868 6650.0 C57
2019-07-01 21:14:30 S 06 55 04.961 -69 17 27.89 V C57
2019-07-01 21:14:30 s 1 -194230.10 5 +80162.821 8300.0 C57
2019-07-01 21:44:30 S 06 55 06.574 -69 15 51.98 V C57
2019-07-01 21:44:30 s 1 -193414.47 1 +77720.003 1230.0 C57
2019-07-01 22:14:30 S 06 55 07.990 -69 14 16.48 V C57
2019-07-01 22:14:30 s 1 -192574.71 2 +75267.497 3770.0 C57
2019-07-01 22:44:30 S 06 55 09.706 -69 12 32.29 V C57
2019-07-01 22:44:30 s 1 -191710.38 4 +72805.393 4240.0 C57
2019-07-01 22:53:45 S 06 56 37.298 -69 08 04.42 L C51
2019-07-01 23:44:30 S 06 55 12.830 -69 09 23.15 V C57
2019-07-01 23:44:30 s 1 -189906.18 5 +67852.797 1970.0 C57
2019-07-02 00:14:30 S 06 55 14.448 -69 07 46.06 V C57
2019-07-02 00:14:30 s 1 -188965.36 5 +65362.526 5580.0 C57
2019-07-02 00:44:30 S 06 55 16.073 -69 06 07.45 V C57
2019-07-02 00:44:30 s 1 -187998.07 7 +62863.102 9830.0 C57
2019-07-02 01:14:30 S 06 55 17.753 -69 04 33.20 V C57
2019-07-02 01:14:30 s 1 -187003.81 3 +60354.659 2770.0 C57
2019-07-02 01:44:30 S 06 55 19.162 -69 02 59.10 V C57
2019-07-02 01:44:30 s 1 -185982.05 3 +57837.343 2370.0 C57
2019-07-02 02:14:30 S 06 55 21.002 -69 01 15.38 V C57
2019-07-02 02:14:30 s 1 -184932.26 1 +55311.309 6570.0 C57
2019-07-02 02:44:30 S 06 55 22.406 -68 59 44.38 V C57
2019-07-02 02:44:30 s 1 -183853.88 5 +52776.724 3200.0 C57
2019-07-02 03:14:30 S 06 55 24.238 -68 58 01.31 V C57
2019-07-02 03:14:30 s 1 -182746.36 0 +50233.771 70.0 C57
2019-07-02 03:44:30 S 06 55 25.678 -68 56 30.84 V C57
2019-07-02 03:44:30 s 1 -181609.10 5 +47682.643 4880.0 C57
2019-07-02 04:44:30 S 06 55 29.179 -68 53 10.57 V C57
2019-07-02 04:44:30 s 1 -179242.99 4 +42556.709 8890.0 C57
2019-07-02 05:10:35 S 06 56 53.498 -68 49 13.44 L C51
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)