(8278) Ooyanagi Main-belt Asteroid
Discovered on 4 May 1991 by Mizuno, Y., Furuta, T. at Kani.
Yosinori Ooyanagi (b. 1954) is a Japanese amateur astronomer who lives in Nara City, Nara. He has contributed to the promotion of astronomy education over many years.Naming citation (WGSBN Bull. 6, #12, 6), IAU / Minor Planet Center, via NASA/JPL
Where Ooyanagi is today
Seen from above the solar system on 2026-10-14: Ooyanagi is 2.92 au from the Sun and 2.05 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 8278 |
| Provisional designation | 1991 JJ |
| Orbit class | Main-belt Asteroid |
| Diameter | 9.58 km (#5,368 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.278 |
| Rotation period | 75.0 hours |
| Absolute magnitude (H) | 12.39 |
| Orbital period | 4.18 years |
| Semi-major axis | 2.59 au |
| Perihelion – aphelion | 2.26 – 2.92 au |
| Eccentricity | 0.127 |
| Inclination | 14.1° |
| Closest distance between its orbit and Earth's (MOID) | 1.26 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.