(21648) Gravanschaik Main-belt Asteroid
Discovered on 12 July 1999 by LINEAR at Socorro.
Graham William Wakefield Van Schaik (b. 1990) was awarded second place in the 2006 Intel International Science and Engineering Fair for his environmental sciences project. He attends the Spring Valley High School, Columbia, South Carolina, U.S.A.Naming citation (20060711/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Gravanschaik is today
Seen from above the solar system on 2026-10-14: Gravanschaik is 2.80 au from the Sun and 3.79 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21648 |
| Provisional designation | 1999 NB57 |
| Orbit class | Main-belt Asteroid |
| Diameter | 8.77 km (#5,940 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0400 |
| Absolute magnitude (H) | 14.23 |
| Orbital period | 4.19 years |
| Semi-major axis | 2.60 au |
| Perihelion – aphelion | 1.99 – 3.20 au |
| Eccentricity | 0.233 |
| Inclination | 11.6° |
| Closest distance between its orbit and Earth's (MOID) | 1.01 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Graham
- (5479) Grahamryder
- (9617) Grahamchapman
- (19582) Blow
- (101491) Grahamcrombie
- (333373) Grahammiller
- (732472) Grahamhill
All asteroids named after someone called Graham
Also discovered on 12 July 1999
- (12571) Occhiogrosso
- (20485) Leaferellec
- (20486) Lemos
- (21625) Seira
- (21626) Matthewhall
- (21646) Joshuaturner
- (21647) Carlturner