(9240) Nassau Main-belt Asteroid
Discovered on 31 May 1997 by Spacewatch at Kitt Peak.
Jason J. Nassau (1893-1965) was director of the Warner and Swasey Observatory and professor at Case Institute of Technology during 1924--1959. A pioneer in studies of galactic structure and early proponent of Schmidt telescopes, he led the effort to build the 61/91-cm Burrell Schmidt telescope, now located at Kitt Peak.Naming citation (20000523/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Nassau is today
Seen from above the solar system on 2026-10-14: Nassau is 2.58 au from the Sun and 1.74 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 9240 |
| Provisional designation | 1997 KR3 |
| Orbit class | Main-belt Asteroid |
| Diameter | 10.1 km (#5,058 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.174 |
| Absolute magnitude (H) | 12.8 |
| Orbital period | 5.56 years |
| Semi-major axis | 3.14 au |
| Perihelion – aphelion | 2.50 – 3.77 au |
| Eccentricity | 0.203 |
| Inclination | 7.25° |
| Closest distance between its orbit and Earth's (MOID) | 1.52 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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