Asteroid
Near-Earth
Masaakikoyama
13553 Masaakikoyama (1992 JE)
Where is it now
- Distance from Sun
- 3.206 AU
- True anomaly
- 180.04°
- 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
- 2.191 AU
- Eccentricity
- 0.4632
- Inclination
- 5.87°
- Orbital period
- 3.24 years
- Perihelion
- 1.176 AU
- Aphelion
- 3.206 AU
- Longitude of ascending node
- 193.31°
- Argument of periapsis
- 110.24°
- Epoch · J2000
- 2461200.5
Physical properties
- Rotation period
- 2.42 days
Visual & observation
- Absolute magnitude (H)
- 16.54
- Spectral type
- AMO
Discovery & classification
Near-Earth Object
Named