(10300) Tanakadate Main-belt Asteroid
Discovered on 6 March 1989 by T. Seki at Geisei.
Physicist Aikitu Tanakadate (1856-1952) was a pioneer in geophysical research in Japan. He started his study by measuring gravity and geomagnetism at many points. The International Latitude Observatory at Mizusawa was founded in 1899 following his proposal.Naming citation (20060219/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Tanakadate is today
Seen from above the solar system on 2026-10-14: Tanakadate is 2.34 au from the Sun and 2.61 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 10300 |
| Provisional designation | 1989 EG1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.35 km (#14,336 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.299 |
| Absolute magnitude (H) | 14.67 |
| Orbital period | 3.33 years |
| Semi-major axis | 2.23 au |
| Perihelion – aphelion | 2.00 – 2.46 au |
| Eccentricity | 0.102 |
| Inclination | 5.47° |
| Closest distance between its orbit and Earth's (MOID) | 1.01 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.