(1421) Esperanto Main-belt Asteroid
Discovered on 18 March 1936 by Y. Vaisala at Turku.
Where Esperanto is today
Seen from above the solar system on 2026-10-14: Esperanto is 3.31 au from the Sun and 2.53 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 1421 |
| Provisional designation | 1936 FQ |
| Orbit class | Main-belt Asteroid |
| Diameter | 43.3 km (#888 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0714 |
| Rotation period | 22.0 hours |
| Absolute magnitude (H) | 10.6 |
| Orbital period | 5.43 years |
| Semi-major axis | 3.09 au |
| Perihelion – aphelion | 2.83 – 3.35 au |
| Eccentricity | 0.0847 |
| Inclination | 9.80° |
| Closest distance between its orbit and Earth's (MOID) | 1.82 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.