(8431) Haseda Main-belt Asteroid
Discovered on 31 December 1997 by T. Kobayashi at Oizumi.
Haseda Kastumi (b. 1945) is an amateur astronomer in Aichi prefecture. During 2000-2002 he discovered the four novae V463 Sct, V1178 Sco, V2540 Oph and V4743 Sgr. He has also discovered 65 new variables, including some Wolf-Rayet stars.Naming citation (20050919/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Haseda is today
Seen from above the solar system on 2026-10-14: Haseda is 2.75 au from the Sun and 3.64 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 8431 |
| Provisional designation | 1997 YQ13 |
| Orbit class | Main-belt Asteroid |
| Diameter | 7.50 km (#7,110 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.286 |
| Absolute magnitude (H) | 12.95 |
| Orbital period | 4.70 years |
| Semi-major axis | 2.81 au |
| Perihelion – aphelion | 2.66 – 2.95 au |
| Eccentricity | 0.0511 |
| Inclination | 1.60° |
| Closest distance between its orbit and Earth's (MOID) | 1.68 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.