(12926) Brianmason Main-belt Asteroid
Discovered on 27 September 1999 by Schiff, J. L., Schiff, C. J. at Takapuna.
Renowned New Zealand-born meteoriticist Brian Mason (b. 1917) worked at the American Museum of Natural History and the Smithsonian Institution. His research included the classification of Antarctic meteorites. The minerals brianite and stenhuggarite (Swedish for stone mason) are named for him.Naming citation (20001013/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Brianmason is today
Seen from above the solar system on 2026-10-14: Brianmason is 2.19 au from the Sun and 1.25 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 12926 |
| Provisional designation | 1999 SO9 |
| Orbit class | Main-belt Asteroid |
| Diameter | 10.2 km (#4,994 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0810 |
| Rotation period | 6.55 hours |
| Absolute magnitude (H) | 13.57 |
| Orbital period | 4.41 years |
| Semi-major axis | 2.69 au |
| Perihelion – aphelion | 2.10 – 3.28 au |
| Eccentricity | 0.220 |
| Inclination | 8.78° |
| Closest distance between its orbit and Earth's (MOID) | 1.11 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Brian
- (4575) Broman
- (7476) Ogilsbie
- (8262) Carcich
- (8734) Warner
- (10059) McCullough
- (10066) Pihack
- (11371) Camley
- (11374) Briantaylor
- (11723) Briankennedy
- (12562) Briangrazer
- (12592) Brianchen
- (14595) Peaker