(5747) Williamina Main-belt Asteroid
Discovered on 10 February 1991 by R. H. McNaught at Siding Spring.
Williamina Paton Stevens Fleming (1857–1911) was a Scottish-American astronomer responsible for major developments in the cataloging of stars and their classification. Her work at Harvard College Observatory also included her discovery of variable stars and nebulae, most notably the Horsehead, from photographic plates.Naming citation (WGSBN Bull. 2, #1, 5), IAU / Minor Planet Center, via NASA/JPL
Where Williamina is today
Seen from above the solar system on 2026-10-14: Williamina is 2.51 au from the Sun and 1.99 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 5747 |
| Provisional designation | 1991 CO3 |
| Orbit class | Main-belt Asteroid |
| Diameter | 9.28 km (#5,560 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.154 |
| Rotation period | 196 hours |
| Absolute magnitude (H) | 12.79 |
| Orbital period | 3.71 years |
| Semi-major axis | 2.40 au |
| Perihelion – aphelion | 1.82 – 2.98 au |
| Eccentricity | 0.241 |
| Inclination | 24.6° |
| Closest distance between its orbit and Earth's (MOID) | 0.838 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.