(15736) Hamanasu Main-belt Asteroid
Discovered on 8 December 1990 by Endate, K., Watanabe, K. at Kitami.
Hamanasu, the name of a Japanese rose, is also the name of a sleeper train that connects Aomori and Sapporo (a 480-km distance) in 7.5 hours. Hamanasu is the only sleeper express train that passes through Seikan, the longest tunnel in the world. The train will be retired in the spring of 2016.Naming citation (MPC batch dated 2015-11-25), IAU / Minor Planet Center, via NASA/JPL
Where Hamanasu is today
Seen from above the solar system on 2026-10-14: Hamanasu is 2.38 au from the Sun and 3.36 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 15736 |
| Provisional designation | 1990 XN |
| Orbit class | Main-belt Asteroid |
| Diameter | 7.83 km (#6,754 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0360 |
| Absolute magnitude (H) | 13.9 |
| Orbital period | 3.87 years |
| Semi-major axis | 2.46 au |
| Perihelion – aphelion | 2.07 – 2.86 au |
| Eccentricity | 0.160 |
| Inclination | 6.32° |
| Closest distance between its orbit and Earth's (MOID) | 1.09 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.