(12121) Greenwald Main-belt Asteroid
Discovered on 13 July 1999 by LINEAR at Socorro.
Stephanie Greenwald mentored a finalist in the 2019 Regeneron Science Talent Search, a science competition for high school seniors. She teaches at the Byram Hills High School, Armonk, New York.Naming citation (WGSBN Bull. 3, #5, 8), IAU / Minor Planet Center, via NASA/JPL
Where Greenwald is today
Seen from above the solar system on 2026-10-14: Greenwald is 2.36 au from the Sun and 3.19 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 12121 |
| Provisional designation | 1999 NX48 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.74 km (#11,146 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.286 |
| Absolute magnitude (H) | 13.96 |
| Orbital period | 4.10 years |
| Semi-major axis | 2.56 au |
| Perihelion – aphelion | 2.28 – 2.84 au |
| Eccentricity | 0.109 |
| Inclination | 13.6° |
| Closest distance between its orbit and Earth's (MOID) | 1.30 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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