(55561) Madenberg Main-belt Asteroid
Discovered on 9 January 2002 by B. L. Stevens at Desert Moon.
Janet A. Stevens (née Madenberg, b. 1950) is an amateur astronomer who started a loaner telescope program in 1984 to introduce novices to telescopic observing. She co-edited Northern Lights from 1990 to 1998 and was executive secretary of the Astronomical League from 1995 to 2001.Naming citation (20030806/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Madenberg is today
Seen from above the solar system on 2026-10-14: Madenberg is 2.59 au from the Sun and 3.48 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 55561 |
| Provisional designation | 2002 AF9 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 16.3 |
| Orbital period | 3.45 years |
| Semi-major axis | 2.28 au |
| Perihelion – aphelion | 1.96 – 2.60 au |
| Eccentricity | 0.140 |
| Inclination | 5.70° |
| Closest distance between its orbit and Earth's (MOID) | 0.961 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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