(11409) Horkheimer Main-belt Asteroid
Discovered on 19 March 1999 by LONEOS at Anderson Mesa.
Jack F. Horkheimer (b. 1938), the executive director of the Miami Space-Transit Planetarium, is best known as the creator and host of the television program Star Hustler (now known as Star Gazer).Naming citation (20010109/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Horkheimer is today
Seen from above the solar system on 2026-10-14: Horkheimer is 3.09 au from the Sun and 3.23 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 11409 |
| Provisional designation | 1999 FD9 |
| Orbit class | Main-belt Asteroid |
| Diameter | 15.4 km (#3,056 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0530 |
| Rotation period | 10.3 hours |
| Absolute magnitude (H) | 12.97 |
| Orbital period | 5.70 years |
| Semi-major axis | 3.19 au |
| Perihelion – aphelion | 2.82 – 3.56 au |
| Eccentricity | 0.115 |
| Inclination | 2.30° |
| Closest distance between its orbit and Earth's (MOID) | 1.83 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Jack
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All asteroids named after someone called Jack
Also discovered on 19 March 1999
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