(9009) Tirso Main-belt Asteroid
Discovered on 23 April 1984 by V. Zappala at La Silla.
Tirso, the scepter of Dionysus, aided the enjoyment of life. As an acronym meaning, in Italian, “all together enjoying, studying, observing”, it represents a scientific and cultural circle, where people share experiences for a better understanding of values, with the dissemination of astronomy as the main motivating force.Naming citation (20080520/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Tirso is today
Seen from above the solar system on 2026-10-14: Tirso is 2.51 au from the Sun and 1.66 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 9009 |
| Provisional designation | 1984 HJ1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.50 km (#13,958 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.274 |
| Absolute magnitude (H) | 14.48 |
| Orbital period | 3.41 years |
| Semi-major axis | 2.26 au |
| Perihelion – aphelion | 1.94 – 2.59 au |
| Eccentricity | 0.144 |
| Inclination | 2.99° |
| Closest distance between its orbit and Earth's (MOID) | 0.922 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.