(1857) Parchomenko Main-belt Asteroid
Discovered on 30 August 1971 by T. M. Smirnova at Nauchnyj.
Where Parchomenko is today
Seen from above the solar system on 2026-10-14: Parchomenko is 2.31 au from the Sun and 3.13 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 1857 |
| Provisional designation | 1971 QS1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 7.99 km (#6,591 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.333 |
| Rotation period | 3.12 hours |
| Spectral type | S |
| Absolute magnitude (H) | 12.33 |
| Orbital period | 3.36 years |
| Semi-major axis | 2.24 au |
| Perihelion – aphelion | 1.94 – 2.55 au |
| Eccentricity | 0.135 |
| Inclination | 4.40° |
| Closest distance between its orbit and Earth's (MOID) | 0.952 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.