(9533) Aleksejleonov Main-belt Asteroid
Discovered on 28 September 1981 by L. V. Zhuravleva at Nauchnyj.
Aleksej Arkhipovich Leonov (b. 1934), during a spaceflight in 1965 with P. I. Belyaev on Voskhod 2, became the first human to “spacewalk” outside a spacecraft when he left the spacecraft for approximately 10 minutes. He was also the commander of the Soyuz spacecraft that linked with the Apollo spacecraft in 1975.Naming citation (20010705/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Aleksejleonov is today
Seen from above the solar system on 2026-10-14: Aleksejleonov is 3.05 au from the Sun and 3.82 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 9533 |
| Provisional designation | 1981 SA7 |
| Orbit class | Main-belt Asteroid |
| Diameter | 9.55 km (#5,381 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0640 |
| Absolute magnitude (H) | 13.61 |
| Orbital period | 4.23 years |
| Semi-major axis | 2.62 au |
| Perihelion – aphelion | 2.16 – 3.08 au |
| Eccentricity | 0.176 |
| Inclination | 6.61° |
| Closest distance between its orbit and Earth's (MOID) | 1.16 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Aleksej
All asteroids named after someone called Aleksej