(21580) Portalatin Main-belt Asteroid
Discovered on 17 September 1998 by LONEOS at Anderson Mesa.
Wilfredo Portalatin (b. 1949), staff technician and telescope operator at the Arecibo Observatory, has played a key role in numerous radar experiments on minor planets since the 1970s.Naming citation (20080718/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Portalatin is today
Seen from above the solar system on 2026-10-14: Portalatin is 2.84 au from the Sun and 3.68 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21580 |
| Provisional designation | 1998 SY57 |
| Orbit class | Main-belt Asteroid |
| Diameter | 6.22 km (#8,615 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.240 |
| Rotation period | 3.63 hours |
| Absolute magnitude (H) | 13.35 |
| Orbital period | 4.93 years |
| Semi-major axis | 2.90 au |
| Perihelion – aphelion | 2.71 – 3.08 au |
| Eccentricity | 0.0655 |
| Inclination | 3.05° |
| Closest distance between its orbit and Earth's (MOID) | 1.69 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 17 September 1998
- (10938) Lorenzalevy
- (11377) Nye
- (11378) Dauria
- (12909) Jaclifford
- (12910) Deliso
- (12911) Goodhue
- (12912) Streator
- (13326) Ferri
- (13327) Reitsema
- (13328) Guetter
- (13332) Benkhoff
- (13333) Carsenty