(541631) Kirbulychev Main-belt Asteroid
Discovered on 21 September 2011 by Kryachko, T., Satovski, B. at Zelenchukskaya Stn.
Kir Bulychev was a pen name of Igor Vsevolodovich Mozheiko (1934–2003). He was a Russian orientalist historian and a well-known science fiction writer. Many of his creations are well-loved by readers of several generations.Naming citation (WGSBN Bull. 3, #11, 8), IAU / Minor Planet Center, via NASA/JPL
Where Kirbulychev is today
Seen from above the solar system on 2026-10-14: Kirbulychev is 3.11 au from the Sun and 4.05 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 541631 |
| Provisional designation | 2011 UT172 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 16.38 |
| Orbital period | 4.24 years |
| Semi-major axis | 2.62 au |
| Perihelion – aphelion | 2.13 – 3.11 au |
| Eccentricity | 0.187 |
| Inclination | 33.3° |
| Closest distance between its orbit and Earth's (MOID) | 1.14 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.