(9869) Yadoumaru Main-belt Asteroid
Discovered on 9 February 1992 by Endate, K., Watanabe, K. at Kitami.
Yasushi Yadoumaru (b. 1965) is a research fellow at the Misato Observatory. His primary field of study is spectroscopic observations of planetary nebulae. His doctoral dissertation was on the evolution of planetary nebulae, focusing on their expansion velocities.Naming citation (20030106/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Yadoumaru is today
Seen from above the solar system on 2026-10-14: Yadoumaru is 2.64 au from the Sun and 2.00 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 9869 |
| Provisional designation | 1992 CD1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 5.49 km (#9,722 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.213 |
| Rotation period | 7.58 hours |
| Absolute magnitude (H) | 14.05 |
| Orbital period | 3.63 years |
| Semi-major axis | 2.36 au |
| Perihelion – aphelion | 2.06 – 2.67 au |
| Eccentricity | 0.130 |
| Inclination | 2.92° |
| Closest distance between its orbit and Earth's (MOID) | 1.07 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Yasushi
All asteroids named after someone called Yasushi