Asteroid
Near-Earth
Poseidon
4341 Poseidon (1987 KF)
Where is it now
- Distance from Sun
- 1.717 AU
- True anomaly
- 231.22°
- 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
- 1.834 AU
- Eccentricity
- 0.6801
- Inclination
- 11.84°
- Orbital period
- 2.48 years
- Perihelion
- 0.587 AU
- Aphelion
- 3.082 AU
- Longitude of ascending node
- 108.02°
- Argument of periapsis
- 15.84°
- Epoch · J2000
- 2461200.5
Physical properties
- Mean radius
- 1.59 km
- Rotation period
- 6.26 hours
Visual & observation
- Geometric albedo
- 0.054
- Absolute magnitude (H)
- 16.07
- Spectral type
- APO
Discovery & classification
Near-Earth Object
Named