(4280) Simonenko Main-belt Asteroid
Discovered on 13 August 1985 by N. S. Chernykh at Nauchnyj.
Where Simonenko is today
Seen from above the solar system on 2026-10-14: Simonenko is 2.36 au from the Sun and 1.76 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 4280 |
| Provisional designation | 1985 PF2 |
| Orbit class | Main-belt Asteroid |
| Diameter | 5.94 km (#9,030 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.262 |
| Rotation period | 508 hours |
| Spectral type | S |
| Absolute magnitude (H) | 13.49 |
| Orbital period | 3.66 years |
| Semi-major axis | 2.38 au |
| Perihelion – aphelion | 2.36 – 2.40 au |
| Eccentricity | 0.00893 |
| Inclination | 4.63° |
| Closest distance between its orbit and Earth's (MOID) | 1.36 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 13 August 1985
- (4786) Tatianina
- (4935) Maslachkova
- (5252) Vikrymov
- (8475) Vsevoivanov
- (8635) Yuriosipov
- (13009) Voloshchuk