(254000) Johncryan Main-belt Asteroid
Discovered on 15 March 2004 by CSS at Catalina.
John C. Ryan (b. 1942) is an American philanthropist who served on the Smithsonian Astrophysical Observatory's advisory board. He generously supported astronomy and the pursuit to find life beyond Earth via a postdoctoral fellowship, supporting the GMT, and as the founding donor of STARS, which provides telescopes and training to rural US schools.Naming citation (WGSBN Bull. 5, #1, 19), IAU / Minor Planet Center, via NASA/JPL
Where Johncryan is today
Seen from above the solar system on 2026-10-14: Johncryan is 2.38 au from the Sun and 3.35 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 254000 |
| Provisional designation | 2004 EB96 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.73 km (#13,370 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0420 |
| Absolute magnitude (H) | 16.45 |
| Orbital period | 4.44 years |
| Semi-major axis | 2.70 au |
| Perihelion – aphelion | 2.16 – 3.24 au |
| Eccentricity | 0.199 |
| Inclination | 13.7° |
| Closest distance between its orbit and Earth's (MOID) | 1.19 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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