(52294) Detlef Main-belt Asteroid
Discovered on 12 October 1990 by Schmadel, L.D., Borngen, F. at Tautenburg.
Detlef Ninnemann (b. 1944) is a German patent attorney and electrical engineer, who trained a generation of trainee patent attorneys in the rigorous application of logic, science and language in their work. He also taught by example to deliver complex arguments in a direct way. Name proposed by the first discoverer.Naming citation (MPC batch dated 2014-07-12), IAU / Minor Planet Center, via NASA/JPL
Where Detlef is today
Seen from above the solar system on 2026-10-14: Detlef is 2.71 au from the Sun and 3.60 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 52294 |
| Provisional designation | 1990 TJ4 |
| Orbit class | Main-belt Asteroid |
| Diameter | 2.82 km (#15,616 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.266 |
| Absolute magnitude (H) | 15.15 |
| Orbital period | 3.80 years |
| Semi-major axis | 2.43 au |
| Perihelion – aphelion | 2.00 – 2.86 au |
| Eccentricity | 0.177 |
| Inclination | 1.82° |
| Closest distance between its orbit and Earth's (MOID) | 0.989 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.