(241509) Sessler Main-belt Asteroid
Discovered on 22 February 2009 by F. Hormuth at Calar Alto.
Gerhard M. Sessler (b. 1931) is professor of Electroacoustics at Technischen Universität Darmstadt. He invented the silicone microphone and, together with James West, the electret microphone used in most telephones. He also has a strong interest in astronomy.Naming citation (20120406/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Sessler is today
Seen from above the solar system on 2026-10-14: Sessler is 2.46 au from the Sun and 2.88 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 241509 |
| Provisional designation | 2009 DT26 |
| Orbit class | Main-belt Asteroid |
| Diameter | 2.79 km (#15,686 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0520 |
| Absolute magnitude (H) | 16.67 |
| Orbital period | 5.31 years |
| Semi-major axis | 3.04 au |
| Perihelion – aphelion | 2.43 – 3.65 au |
| Eccentricity | 0.201 |
| Inclination | 0.395° |
| Closest distance between its orbit and Earth's (MOID) | 1.42 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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