(9549) Akplatonov Main-belt Asteroid
Discovered on 19 September 1985 by Chernykh, N. S., Chernykh, L. I. at Nauchnyj.
Aleksandr Konstantinovich Platonov (b. 1931), a researcher in astrodynamics and robotics at the Keldysh Institute of Applied Mathematics since 1954, is a pioneer in the theory and computation of satellite orbits and the control of spacecraft trajectories to the moon and planets, as well as the motion of walking robots.Naming citation (20020624/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Akplatonov is today
Seen from above the solar system on 2026-10-14: Akplatonov is 2.69 au from the Sun and 2.81 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 9549 |
| Provisional designation | 1985 SM2 |
| Orbit class | Main-belt Asteroid |
| Diameter | 8.24 km (#6,365 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.285 |
| Rotation period | 2.84 hours |
| Absolute magnitude (H) | 12.74 |
| Orbital period | 4.21 years |
| Semi-major axis | 2.61 au |
| Perihelion – aphelion | 2.33 – 2.88 au |
| Eccentricity | 0.105 |
| Inclination | 11.2° |
| Closest distance between its orbit and Earth's (MOID) | 1.35 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Aleksandr
- (2112) Ulyanov
- (2208) Pushkin
- (4420) Alandreev
- (5014) Gorchakov
- (5219) Zemka
- (6075) Zajtsev
- (7269) Alprokhorov
- (7558) Yurlov
- (7910) Aleksola
- (7996) Vedernikov
- (8322) Kononovich
- (8339) Kosovichia
All asteroids named after someone called Aleksandr
Also discovered on 19 September 1985
- (3986) Rozhkovskij
- (6232) Zubitskia
- (6589) Jankovich
- (9733) Valtikhonov
- (9933) Alekseev
- (13922) Kremenia
- (16407) Oiunskij
- (24648) Evpatoria
- (24649) Balaklava