(15391) Steliomancinelli Main-belt Asteroid
Discovered on 3 October 1997 by A. Vagnozzi at Stroncone.
Stelio Mancinelli Degli Esposti (1931-2017) was a professor of chemistry in Terni. Deeply keen on mathematics, physics and astronomy, he designed and implemented large sundials in various Italian cities. He was well known for giving lectures about the history of astronomy and for training courses for teachers.Naming citation (MPC batch dated 2018-05-29), IAU / Minor Planet Center, via NASA/JPL
Where Steliomancinelli is today
Seen from above the solar system on 2026-10-14: Steliomancinelli is 2.70 au from the Sun and 3.57 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 15391 |
| Provisional designation | 1997 TS16 |
| Orbit class | Main-belt Asteroid |
| Diameter | 2.99 km (#15,245 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.238 |
| Absolute magnitude (H) | 15.02 |
| Orbital period | 3.78 years |
| Semi-major axis | 2.43 au |
| Perihelion – aphelion | 2.05 – 2.81 au |
| Eccentricity | 0.157 |
| Inclination | 5.18° |
| Closest distance between its orbit and Earth's (MOID) | 1.05 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.