(21678) Lindner Main-belt Asteroid
Discovered on 5 September 1999 by Lehmann, G., Kandler, J. at Drebach.
Klaus Lindner (b. 1935) worked as a school teacher of astronomy in Germany for many years. He is known to amateur astronomers as the author of five astronomical books. One of them, Astronomie selbst erlebt, helped the first discoverer of this minor planet to make his first observations.Naming citation (20020724/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Lindner is today
Seen from above the solar system on 2026-10-14: Lindner is 2.85 au from the Sun and 3.76 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21678 |
| Provisional designation | 1999 RK27 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.65 km (#13,573 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.230 |
| Absolute magnitude (H) | 14.5 |
| Orbital period | 4.06 years |
| Semi-major axis | 2.55 au |
| Perihelion – aphelion | 2.16 – 2.93 au |
| Eccentricity | 0.152 |
| Inclination | 7.61° |
| Closest distance between its orbit and Earth's (MOID) | 1.16 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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