(20664) Senec Outer Main-belt Asteroid
Discovered on 31 October 1999 by Galad, A., Toth, J. at Modra.
The town of Senec is located in the south-west of Slovakia. The historical development of the town is dated from the middle of the 13th century. Senec actively supports amateur astronomy. In 1982 an astronomical observatory was built on the building of Albert Molnár Szenczi Elementary School.Naming citation (MPC batch dated 2018-09-25), IAU / Minor Planet Center, via NASA/JPL
Where Senec is today
Seen from above the solar system on 2026-10-14: Senec is 3.60 au from the Sun and 3.21 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 20664 |
| Provisional designation | 1999 UV4 |
| Orbit class | Outer Main-belt Asteroid |
| Diameter | 15.2 km (#3,103 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0770 |
| Absolute magnitude (H) | 12.85 |
| Orbital period | 6.48 years |
| Semi-major axis | 3.47 au |
| Perihelion – aphelion | 3.24 – 3.71 au |
| Eccentricity | 0.0671 |
| Inclination | 10.3° |
| Closest distance between its orbit and Earth's (MOID) | 2.23 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.