(37734) Bonacina Main-belt Asteroid
Discovered on 30 October 1996 by Testa, A., Giuliani, V. at Sormano.
Celestino Bonacina (b. 1947) made his private observatory available to schoolchildren for many years. In the 1980s his experience was essential for the building of the Osservatorio Astronomico Sormano, where this minor planet was discovered.Naming citation (WGSBN Bull. 2, #2, 7), IAU / Minor Planet Center, via NASA/JPL
Where Bonacina is today
Seen from above the solar system on 2026-10-14: Bonacina is 2.22 au from the Sun and 3.21 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 37734 |
| Provisional designation | 1996 UR3 |
| Orbit class | Main-belt Asteroid |
| Diameter | 2.28 km (#16,649 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.373 |
| Rotation period | 7.01 hours |
| Absolute magnitude (H) | 15.28 |
| Orbital period | 3.48 years |
| Semi-major axis | 2.30 au |
| Perihelion – aphelion | 1.88 – 2.71 au |
| Eccentricity | 0.180 |
| Inclination | 4.75° |
| Closest distance between its orbit and Earth's (MOID) | 0.870 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.