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Discovery and designation
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| Discovery date | , |
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Designations
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| MPC designation | 11409 |
| Named after | Jack Horkheimer |
| Alternate name(s) | 1999 FD9 |
| Epoch May 14, 2008 | |
| Ap | 3.5624274 |
| Peri | 2.8135714 |
| Eccentricity | 0.1174492 |
| Orbital period | 2079.1019758 |
| Mean anomaly | 204.51619 |
| Inclination | 2.29868 |
| Longitude of ascending node | 115.96408 |
| Argument of peri | 77.19065 |
| Absolute magnitude (H) | 12.9 |
11409 Horkheimer (1999 FD9) is a main-belt asteroid discovered March 19, 1999 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station. It is named in honor of Jack F. Horkheimer (b. 1938 d. 2010), former executive director of the Miami Space-Transit Planetarium, who is best known as the creator and host of the television program Jack Horkheimer: Star Gazer.