(25163) Williammcdonald Main-belt Asteroid
Discovered on 17 September 1998 by LONEOS at Anderson Mesa.
William “Bill” McDonald (b. 1935) is an avid amateur astronomer. He has volunteered in Lowell Observatory's evening outreach programs since 2012, spearheading the reintroduction of the public program's video observing system (Mallincam) and assisting staff with its upgrade and maintenance.Naming citation (MPC batch dated 2017-10-05), IAU / Minor Planet Center, via NASA/JPL
Where Williammcdonald is today
Seen from above the solar system on 2026-10-14: Williammcdonald is 3.28 au from the Sun and 2.40 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 25163 |
| Provisional designation | 1998 SC60 |
| Orbit class | Main-belt Asteroid |
| Rotation period | 34.3 hours |
| Absolute magnitude (H) | 13.88 |
| Orbital period | 5.65 years |
| Semi-major axis | 3.17 au |
| Perihelion – aphelion | 3.07 – 3.28 au |
| Eccentricity | 0.0333 |
| Inclination | 9.58° |
| Closest distance between its orbit and Earth's (MOID) | 2.07 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 17 September 1998
- (10938) Lorenzalevy
- (11377) Nye
- (11378) Dauria
- (12909) Jaclifford
- (12910) Deliso
- (12911) Goodhue
- (12912) Streator
- (13326) Ferri
- (13327) Reitsema
- (13328) Guetter
- (13332) Benkhoff
- (13333) Carsenty