(6444) Ryuzin Mars-crossing Asteroid
Discovered on 20 November 1989 by Suzuki, K., Urata, T. at Toyota.
Ryuzin is a small town within Toyota city, Aichi prefecture, Japan. The town name, derived from Japanese words meaning ‘Dragon’ and ‘God’, originated from an ancient belief that people saw tornadoes as dragons. Name suggested by junior high school student K. Takagi.Naming citation (MPC batch dated 2015-06-02), IAU / Minor Planet Center, via NASA/JPL
Where Ryuzin is today
Seen from above the solar system on 2026-10-14: Ryuzin is 2.08 au from the Sun and 2.16 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 6444 |
| Provisional designation | 1989 WW |
| Orbit class | Mars-crossing Asteroid |
| Rotation period | 7.93 hours |
| Absolute magnitude (H) | 14.31 |
| Orbital period | 3.33 years |
| Semi-major axis | 2.23 au |
| Perihelion – aphelion | 1.55 – 2.91 au |
| Eccentricity | 0.304 |
| Inclination | 6.06° |
| Closest distance between its orbit and Earth's (MOID) | 0.564 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.