(20507) Marclaessens Main-belt Asteroid
Discovered on 7 September 1999 by LINEAR at Socorro.
Marline Claessens (b. 1977) is a Belgian aerospace engineer at the European Space Agency who contributed to multiple scientific instruments and missions like Comet Interceptor, ExoMars, JUICE, and EnVision. She also supported the unfunded Don Quijote space mission, designing a satellite mission for asteroid deflection.Naming citation (WGSBN Bull. 6, #11, 25), IAU / Minor Planet Center, via NASA/JPL
Where Marclaessens is today
Seen from above the solar system on 2026-10-14: Marclaessens is 2.35 au from the Sun and 2.34 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 20507 |
| Provisional designation | 1999 RU19 |
| Orbit class | Main-belt Asteroid |
| Rotation period | 10.3 hours |
| Absolute magnitude (H) | 15.06 |
| Orbital period | 3.24 years |
| Semi-major axis | 2.19 au |
| Perihelion – aphelion | 1.93 – 2.45 au |
| Eccentricity | 0.120 |
| Inclination | 0.0786° |
| Closest distance between its orbit and Earth's (MOID) | 0.917 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 7 September 1999
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- (12577) Samra
- (12578) Bensaur
- (12585) Katschwarz
- (12586) Juliaspeyer
- (12588) Arseneau
- (12604) Lisatate
- (12924) Madisonicole
- (13818) Ullery
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