(13903) Darrylwatanabe Main-belt Asteroid
Discovered on 30 September 1975 by S. J. Bus at Palomar.
Darryl Y. Watanabe (b. 1961) was the Observatory Manager for the NASA Infrared Telescope Facility on Maunakea. He helped to develop and maintain many of the observatory's infrared instruments and thus played an important role in enhancing the science productivity of the telescope.Naming citation (WGSBN Bull. 4, #6, 6), IAU / Minor Planet Center, via NASA/JPL
Where Darrylwatanabe is today
Seen from above the solar system on 2026-10-14: Darrylwatanabe is 2.43 au from the Sun and 3.43 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 13903 |
| Provisional designation | 1975 ST |
| Orbit class | Main-belt Asteroid |
| Diameter | 8.79 km (#5,934 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0500 |
| Rotation period | 12.9 hours |
| Absolute magnitude (H) | 14.38 |
| Orbital period | 4.37 years |
| Semi-major axis | 2.67 au |
| Perihelion – aphelion | 2.03 – 3.32 au |
| Eccentricity | 0.242 |
| Inclination | 11.2° |
| Closest distance between its orbit and Earth's (MOID) | 1.05 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 30 September 1975
- (3296) Bosque Alegre
- (4517) Ralpharvey
- (5497) Sararussell
- (6216) San Jose
- (7807) Grier
- (7909) Ziffer
- (8129) Michaelbusch
- (8242) Joshemery
- (8243) Devonburr
- (9715) Paolotanga
- (11440) Massironi
- (12183) Caltonen