(9175) Graun Main-belt Asteroid
Discovered on 29 July 1990 by H. E. Holt at Palomar.
Ken Graun (b. 1955) has written two astronomical books. What's Out Tonight? is a major compilation of what the night sky will look like for the next 50 years. His introduction to the planets is intended for young children.Naming citation (20010309/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Graun is today
Seen from above the solar system on 2026-10-14: Graun is 2.90 au from the Sun and 3.82 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 9175 |
| Provisional designation | 1990 OO2 |
| Orbit class | Main-belt Asteroid |
| Diameter | 7.93 km (#6,654 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.308 |
| Rotation period | 25.8 hours |
| Absolute magnitude (H) | 12.39 |
| Orbital period | 4.20 years |
| Semi-major axis | 2.60 au |
| Perihelion – aphelion | 2.23 – 2.97 au |
| Eccentricity | 0.141 |
| Inclination | 15.1° |
| Closest distance between its orbit and Earth's (MOID) | 1.22 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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