(4170) Semmelweis Main-belt Asteroid
Discovered on 6 August 1980 by Z. Vavrova at Klet.
Where Semmelweis is today
Seen from above the solar system on 2026-10-14: Semmelweis is 2.88 au from the Sun and 3.80 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 4170 |
| Provisional designation | 1980 PT |
| Orbit class | Main-belt Asteroid |
| Diameter | 16.8 km (#2,718 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.172 |
| Rotation period | 5.30 hours |
| Absolute magnitude (H) | 11.71 |
| Orbital period | 5.25 years |
| Semi-major axis | 3.02 au |
| Perihelion – aphelion | 2.75 – 3.29 au |
| Eccentricity | 0.0903 |
| Inclination | 10.3° |
| Closest distance between its orbit and Earth's (MOID) | 1.75 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 6 August 1980
- (2522) Triglav
- (2523) Ryba
- (2544) Gubarev
- (2570) Porphyro
- (3908) Nyx
- (6263) Druckmuller
- (7860) Zahnle
- (8066) Poldimeri
- (8617) Fellous
- (8991) Solidarity
- (11005) Waldtrudering