(13414) Grantham Main-belt Asteroid
Discovered on 29 October 1999 by CSS at Catalina.
James Grantham (b. 1966) is the observatory operations supervisor at the Steward Observatory Mt. Lemmon Station. He played a vital role defending the telescopes at both Mt. Lemmon and Mt. Bigelow during the 2002 Bullock and 2003 Aspen wildfires. He enjoys working on his family's ranch near Arivaca, Arizona.Naming citation (20101128/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Grantham is today
Seen from above the solar system on 2026-10-14: Grantham is 2.75 au from the Sun and 3.30 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 13414 |
| Provisional designation | 1999 UN25 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.39 km (#11,864 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.365 |
| Absolute magnitude (H) | 13.85 |
| Orbital period | 4.77 years |
| Semi-major axis | 2.83 au |
| Perihelion – aphelion | 2.64 – 3.03 au |
| Eccentricity | 0.0674 |
| Inclination | 1.22° |
| Closest distance between its orbit and Earth's (MOID) | 1.63 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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All asteroids named after someone called James
Also discovered on 29 October 1999
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