(91604) Clausmadsen Main-belt Asteroid
Discovered on 14 October 1999 by Pauwels, T., Boffin, H. at Uccle.
Claus Madsen (b. 1951), senior counselor for international relations at the European Southern Observatory, has played a crucial role in increasing public awareness and interest in astronomy. He helped create the European Association for Astronomy Education and was key in having the U.N. pass the IYA resolution.Naming citation (WGSBN Bull. 4, #11, 6), IAU / Minor Planet Center, via NASA/JPL
Where Clausmadsen is today
Seen from above the solar system on 2026-10-14: Clausmadsen is 3.05 au from the Sun and 2.31 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 91604 |
| Provisional designation | 1999 TN19 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 14.53 |
| Orbital period | 5.29 years |
| Semi-major axis | 3.03 au |
| Perihelion – aphelion | 2.96 – 3.11 au |
| Eccentricity | 0.0245 |
| Inclination | 11.1° |
| Closest distance between its orbit and Earth's (MOID) | 2.00 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Claus
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