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Solar
Asteroid Near-Earth

Sisyphus

1866 Sisyphus (1972 XA)

Where is it now

Distance from Sun
2.612 AU
True anomaly
205.66°
As of
29 August 2026

Two-body Kepler propagation — accurate to ~0.1% for major planets over decades, less so for highly-perturbed bodies. Use JPL Horizons for high precision.

Orbital elements

Semi-major axis
1.893 AU
Eccentricity
0.5381
Inclination
41.21°
Orbital period
2.61 years
Perihelion
0.875 AU
Aphelion
2.912 AU
Longitude of ascending node
63.45°
Argument of periapsis
293.09°
Epoch · J2000
2461200.5

Physical properties

Mean radius
4.24 km
Rotation period
2.4 hours

Visual & observation

Geometric albedo
0.15
Absolute magnitude (H)
12.47
Spectral type
APO

Discovery & classification

Near-Earth Object Named

Sources