(121121) Koyoharugotoge Inner Main-belt Asteroid
Discovered on 19 April 1999 by R. A. Tucker at Goodricke-Pigott.
Koyoharu Gotoge (b. 1988) is a Japanese mangaka and the author of the manga Demon Slayer: Kimetsu no Yaiba, which inspired the realization of the popular anime series with the same name.Naming citation (WGSBN Bull. 3, #14, 7), IAU / Minor Planet Center, via NASA/JPL
Where Koyoharugotoge is today
Seen from above the solar system on 2026-10-14: Koyoharugotoge is 1.94 au from the Sun and 1.54 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 121121 |
| Provisional designation | 1999 HJ3 |
| Orbit class | Inner Main-belt Asteroid |
| Absolute magnitude (H) | 17.07 |
| Orbital period | 2.59 years |
| Semi-major axis | 1.88 au |
| Perihelion – aphelion | 1.83 – 1.94 au |
| Eccentricity | 0.0292 |
| Inclination | 23.3° |
| Closest distance between its orbit and Earth's (MOID) | 0.816 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.