(18290) Sumiyoshi Main-belt Asteroid
Discovered on 18 February 1977 by Kosai, H., Hurukawa, K. at Kiso.
Sumiyoshi, in the south of Osaka prefecture, is an important port for trade between Japan and the Korean Peninsula. The Sumiyoshi Taisha shrine, a guardian of voyage, was founded in 211. At the shrine, there is a lighthouse, believed to be the oldest in Japan.Naming citation (WGSBN Bull. 5, #21, 6), IAU / Minor Planet Center, via NASA/JPL
Where Sumiyoshi is today
Seen from above the solar system on 2026-10-14: Sumiyoshi is 2.27 au from the Sun and 3.08 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 18290 |
| Provisional designation | 1977 DR2 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.66 km (#13,548 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.479 |
| Absolute magnitude (H) | 13.91 |
| Orbital period | 3.54 years |
| Semi-major axis | 2.32 au |
| Perihelion – aphelion | 2.13 – 2.52 au |
| Eccentricity | 0.0848 |
| Inclination | 6.72° |
| Closest distance between its orbit and Earth's (MOID) | 1.13 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 18 February 1977
- (2330) Ontake
- (2924) Mitake-mura
- (2960) Ohtaki
- (3249) Musashino
- (3391) Sinon
- (3607) Naniwa
- (4186) Tamashima
- (4812) Hakuhou
- (4963) Kanroku
- (5017) Tenchi
- (5082) Nihonsyoki
- (7104) Manyousyu