(16111) Donstrittmatter Main-belt Asteroid
Discovered on 4 December 1999 by CSS at Catalina.
Donald J. Strittmatter (1935–2020) worked at Hughes Aircraft for 37 years retiring in 1994. He became President of the Tucson Amateur Astronomers in 1958 serving until 1976. In the late 1950s he was active in the Moonwatch program and known for photography of satellites and comets and teaching telescope making classes.Naming citation (WGSBN Bull. 1, #1, 12), IAU / Minor Planet Center, via NASA/JPL
Where Donstrittmatter is today
Seen from above the solar system on 2026-10-14: Donstrittmatter is 2.72 au from the Sun and 2.14 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 16111 |
| Provisional designation | 1999 XT4 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.50 km (#13,969 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.275 |
| Absolute magnitude (H) | 14.68 |
| Orbital period | 3.83 years |
| Semi-major axis | 2.45 au |
| Perihelion – aphelion | 2.03 – 2.86 au |
| Eccentricity | 0.169 |
| Inclination | 3.89° |
| Closest distance between its orbit and Earth's (MOID) | 1.02 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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