(19392) Oyamada Main-belt Asteroid
Discovered on 22 February 1998 by T. Okuni at Nanyo.
Hiroyuki Oyamada (b. 1970) is an amateur astronomer and a member of the Chokainomori Astronomy Club in Sakata, Yamagata, Japan. He became interested in astronomy around 1979 and has observed Jupiter and solar eclipses since 1994.Naming citation (20111012/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Oyamada is today
Seen from above the solar system on 2026-10-14: Oyamada is 2.32 au from the Sun and 2.97 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 19392 |
| Provisional designation | 1998 DW31 |
| Orbit class | Main-belt Asteroid |
| Diameter | 2.29 km (#16,633 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.535 |
| Rotation period | 4.54 hours |
| Absolute magnitude (H) | 14.98 |
| Orbital period | 3.47 years |
| Semi-major axis | 2.29 au |
| Perihelion – aphelion | 2.16 – 2.43 au |
| Eccentricity | 0.0588 |
| Inclination | 6.64° |
| Closest distance between its orbit and Earth's (MOID) | 1.17 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Hiroyuki
- (7186) Tomioka
- (9642) Takatahiro
- (11072) Hiraoka
- (11928) Akimotohiro
- (27816) Naitohiroyuki
- (30925) Todahiroyuki
- (31402) Negishi
- (46649) Tsudahiroyuki
All asteroids named after someone called Hiroyuki