(10964) Degraaff Main-belt Asteroid
Discovered on 26 March 1971 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar.
Willem de Graaff (1923-2004) was a Dutch astronomical researcher at Utrecht University who unveiled the wonders of the universe to thousands of people in over 625 lectures in 42 years.Naming citation (20060413/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Degraaff is today
Seen from above the solar system on 2026-10-14: Degraaff is 2.71 au from the Sun and 3.60 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 10964 |
| Provisional designation | 3216 T-1 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 14.4 |
| Orbital period | 4.58 years |
| Semi-major axis | 2.76 au |
| Perihelion – aphelion | 2.68 – 2.84 au |
| Eccentricity | 0.0300 |
| Inclination | 2.14° |
| Closest distance between its orbit and Earth's (MOID) | 1.66 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Willem
- (1964) Luyten
- (9686) Keesom
- (10436) Janwillempel
- (10652) Blaeu
- (10654) Bontekoe
- (10984) Gispen
- (11240) Piso
- (11427) Willemkolff
- (12132) Wimfroger
- (12162) Bilderdijk
- (12175) Wimhermans
- (13045) Vermandere
All asteroids named after someone called Willem
Also discovered on 26 March 1971
- (5195) Kaendler
- (5491) Kaulbach
- (5492) Thoma
- (5698) Nolde
- (6202) Georgemiley
- (6257) Thorvaldsen
- (6351) Neumann
- (6429) Brancusi
- (6674) Cezanne
- (6752) Ashley
- (7367) Giotto
- (7908) Zwingli