(31689) Sebmellen Main-belt Asteroid
Discovered on 10 May 1999 by LINEAR at Socorro.
Sebastian Lucas Mellen (b. 2001) is a finalist in the 2015 Broadcom MASTERS, a math and science competition for middle school students, for his computer science and software engineering project. He attends the Mt. Everest Academy, San Diego, California.Naming citation (MPC batch dated 2015-11-25), IAU / Minor Planet Center, via NASA/JPL
Where Sebmellen is today
Seen from above the solar system on 2026-10-14: Sebmellen is 2.77 au from the Sun and 3.71 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 31689 |
| Provisional designation | 1999 JW27 |
| Orbit class | Main-belt Asteroid |
| Diameter | 7.30 km (#7,314 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0760 |
| Absolute magnitude (H) | 14.44 |
| Orbital period | 5.46 years |
| Semi-major axis | 3.10 au |
| Perihelion – aphelion | 2.67 – 3.53 au |
| Eccentricity | 0.139 |
| Inclination | 2.07° |
| 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 Sebastian
All asteroids named after someone called Sebastian
Also discovered on 10 May 1999
- (11219) Benbohn
- (11225) Borden
- (11227) Ksenborisova
- (11228) Botnick
- (11229) Brookebowers
- (11230) Deschaffer
- (11231) Schiavo
- (11413) Catanach
- (11414) Allanchu
- (12117) Meagmessina
- (16048) Eddiedai
- (16049) D'Amore