(212121) Marthegautier Main-belt Asteroid
Discovered on 11 March 2005 by Mt. Lemmon Survey at Mount Lemmon.
French medical doctor Marthe Gautier (1925–2022) researched congenital heart diseases in children. In 1958, she discovered that an extra chromosome was the cause of Down syndrome, later called trisomy 21.Naming citation (WGSBN Bull. 5, #19, 9), IAU / Minor Planet Center, via NASA/JPL
Where Marthegautier is today
Seen from above the solar system on 2026-10-14: Marthegautier is 2.80 au from the Sun and 2.97 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 212121 |
| Provisional designation | 2005 EP195 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 17.62 |
| Orbital period | 3.76 years |
| Semi-major axis | 2.42 au |
| Perihelion – aphelion | 2.02 – 2.82 au |
| Eccentricity | 0.165 |
| Inclination | 0.824° |
| Closest distance between its orbit and Earth's (MOID) | 1.00 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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