(5505) Rundetaarn Main-belt Asteroid
Discovered on 6 November 1986 by P. Jensen at Brorfelde.
The “Rundetaarn”, or Round Tower, is the astronomical observatory built in the heart of Copenhagen from 1637 to 1642 by king Christian IV. Its unique interior spiral staircase makes it possible to stroll all the way to the top.Naming citation (20050407/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Rundetaarn is today
Seen from above the solar system on 2026-10-14: Rundetaarn is 2.88 au from the Sun and 3.08 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 5505 |
| Provisional designation | 1986 VD1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 22.0 km (#1,960 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0490 |
| Absolute magnitude (H) | 12.3 |
| Orbital period | 4.87 years |
| Semi-major axis | 2.87 au |
| Perihelion – aphelion | 2.47 – 3.28 au |
| Eccentricity | 0.141 |
| Inclination | 11.0° |
| Closest distance between its orbit and Earth's (MOID) | 1.49 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.