(32990) Sayo-hime Main-belt Asteroid
Discovered on 30 December 1996 by N. Sato at Chichibu.
Sayo-hime is the female protagonist of a love story, written around the sixth century, in which a young man heads off to the Korean peninsula. This tragic love story was included in Japan's oldest collection of waka poetry, the Manyohshu.Naming citation (20120207/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Sayo-hime is today
Seen from above the solar system on 2026-10-14: Sayo-hime is 2.98 au from the Sun and 2.16 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 32990 |
| Provisional designation | 1996 YD3 |
| Orbit class | Main-belt Asteroid |
| Diameter | 7.87 km (#6,705 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.136 |
| Rotation period | 4.79 hours |
| Absolute magnitude (H) | 13.48 |
| Orbital period | 5.27 years |
| Semi-major axis | 3.03 au |
| Perihelion – aphelion | 2.78 – 3.28 au |
| Eccentricity | 0.0829 |
| Inclination | 9.46° |
| Closest distance between its orbit and Earth's (MOID) | 1.78 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.