(121654) Michaelpryzby Outer Main-belt Asteroid
Discovered on 4 December 1999 by CSS at Catalina.
Michael S. Pryzby (b. 1967) is the Instrument Systems Engineer on the OSIRIS-REx Mission. Prior to this, he was the Lead Spacecraft Systems Engineer on the Lunar Reconnaissance Orbiter. In his career, he has supported NASA GSFC for over 25 years.Naming citation (MPC batch dated 2016-11-14), IAU / Minor Planet Center, via NASA/JPL
Where Michaelpryzby is today
Seen from above the solar system on 2026-10-14: Michaelpryzby is 3.51 au from the Sun and 3.46 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 121654 |
| Provisional designation | 1999 XY2 |
| Orbit class | Outer Main-belt Asteroid |
| Diameter | 5.75 km (#9,305 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0700 |
| Absolute magnitude (H) | 15.07 |
| Orbital period | 5.77 years |
| Semi-major axis | 3.22 au |
| Perihelion – aphelion | 2.92 – 3.52 au |
| Eccentricity | 0.0932 |
| Inclination | 6.38° |
| Closest distance between its orbit and Earth's (MOID) | 1.93 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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