(3921) Klement'ev Main-belt Asteroid
Discovered on 19 July 1971 by B. A. Burnasheva at Nauchnyj.
Named in memory of Zakhar Ivanovich Klementʹev (1903–1994), professor of mathematics at Tomsk University. For more than 60 years he delivered lectures on mathematical analysis, functional analysis and other topics, imbuing in young minds by the beauty and accessibility of his presentation the most complex problems of mathematics. He authored more than 60 scientific papers and the six-part series Lectures on Mathematical Analysis. The fascination of his personality and creative individuality is preserved in the memory of his numerous disciples, scattered now throughout Russia and abroad.Naming citation (WGSBN Bull. 6, #10, 5), IAU / Minor Planet Center, via NASA/JPL
Where Klement'ev is today
Seen from above the solar system on 2026-10-14: Klement'ev is 3.04 au from the Sun and 3.87 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 3921 |
| Provisional designation | 1971 OH |
| Orbit class | Main-belt Asteroid |
| Diameter | 16.5 km (#2,784 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0380 |
| Rotation period | 6.75 hours |
| Absolute magnitude (H) | 12.77 |
| Orbital period | 4.31 years |
| Semi-major axis | 2.65 au |
| Perihelion – aphelion | 1.89 – 3.40 au |
| Eccentricity | 0.285 |
| Inclination | 12.0° |
| Closest distance between its orbit and Earth's (MOID) | 0.903 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.