(20403) Attenborough Main-belt Asteroid
Discovered on 22 July 1998 by J. Broughton at Reedy Creek.
Englishman David Attenborough (b. 1927) is by common consent the world's foremost naturalist and broadcaster of wildlife documentaries. His brother Richard (b. 1923) is a fine character actor whose first attempt at producing and directing resulted in the 1982 Oscar-winning epic Gandhi.Naming citation (20011230/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Attenborough is today
Seen from above the solar system on 2026-10-14: Attenborough is 2.85 au from the Sun and 3.35 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 20403 |
| Provisional designation | 1998 OW11 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 13.57 |
| Orbital period | 5.14 years |
| Semi-major axis | 2.98 au |
| Perihelion – aphelion | 2.71 – 3.25 au |
| Eccentricity | 0.0911 |
| Inclination | 11.7° |
| Closest distance between its orbit and Earth's (MOID) | 1.73 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.