(17509) Ikumadan Main-belt Asteroid
Discovered on 4 May 1992 by T. Seki at Geisei.
Conductor Ikuma Dan (1924–2001), grandson of financier Takuma Dan, was a leading member of the Art Academy of Japan. He composed symphonies, songs and operas, including the celebrated Yuzuru (The Evening Crane). The name was suggested by K. Tomita, who was a classmate at Aoyama Gakuin High School.Naming citation (WGSBN Bull. 3, #14, 5), IAU / Minor Planet Center, via NASA/JPL
Where Ikumadan is today
Seen from above the solar system on 2026-10-14: Ikumadan is 2.35 au from the Sun and 2.44 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 17509 |
| Provisional designation | 1992 JR |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.54 km (#13,865 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.246 |
| Rotation period | 5.79 hours |
| Absolute magnitude (H) | 14.38 |
| Orbital period | 3.53 years |
| Semi-major axis | 2.32 au |
| Perihelion – aphelion | 1.73 – 2.91 au |
| Eccentricity | 0.255 |
| Inclination | 8.12° |
| Closest distance between its orbit and Earth's (MOID) | 0.745 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.