(91428) Cortesi Main-belt Asteroid
Discovered on 20 August 1999 by S. Sposetti at Gnosca.
Sergio Cortesi (b. 1932) has been the director of the Specola Solare Locarno-Monti since 1957. He was one of the co-founders and for a long time the president of the Società Astronomica Ticinese.Naming citation (20070402/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Cortesi is today
Seen from above the solar system on 2026-10-14: Cortesi is 2.43 au from the Sun and 3.21 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 91428 |
| Provisional designation | 1999 QT1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.79 km (#13,241 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.282 |
| Absolute magnitude (H) | 14.57 |
| Orbital period | 4.27 years |
| Semi-major axis | 2.63 au |
| Perihelion – aphelion | 2.25 – 3.01 au |
| Eccentricity | 0.145 |
| Inclination | 11.8° |
| Closest distance between its orbit and Earth's (MOID) | 1.28 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Sergio
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- (21192) Seccisergio
- (23755) Sergiolozano
- (90288) Dalleave
- (101493) Sergiofoparri
- (172430) Sergiofonti
- (868690) Fajardo-Acosta
All asteroids named after someone called Sergio