(27955) Yasumasa Main-belt Asteroid
Discovered on 24 August 1997 by T. Okuni at Nanyo.
Yasumasa Watanabe (b. 1946) became a member of the Yamagata Astronomical Society in 1986 and actively popularizes astronomy.Naming citation (20111210/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Yasumasa is today
Seen from above the solar system on 2026-10-14: Yasumasa is 2.50 au from the Sun and 3.02 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 27955 |
| Provisional designation | 1997 QU4 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.46 km (#11,714 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.117 |
| Absolute magnitude (H) | 15.02 |
| Orbital period | 3.71 years |
| Semi-major axis | 2.40 au |
| Perihelion – aphelion | 1.90 – 2.90 au |
| Eccentricity | 0.210 |
| Inclination | 6.88° |
| Closest distance between its orbit and Earth's (MOID) | 0.905 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.