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