(90564) Markjarnyk Main-belt Asteroid
Discovered on 12 April 2004 by Siding Spring Survey at Siding Spring.
Mark Andrew Jarnyk (1963-2006) was a software engineer at the Australian National University's Research School of Astronomy and Astrophysics. He made significant contributions to instrumentation for the Gemini Observatory and the JACARA project. This is the first numbered discovery from the Siding Spring Survey.Naming citation (20060809/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Markjarnyk is today
Seen from above the solar system on 2026-10-14: Markjarnyk is 2.75 au from the Sun and 3.65 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 90564 |
| Provisional designation | 2004 GJ2 |
| Orbit class | Main-belt Asteroid |
| Diameter | 8.09 km (#6,486 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0740 |
| Absolute magnitude (H) | 14.16 |
| Orbital period | 5.58 years |
| Semi-major axis | 3.15 au |
| Perihelion – aphelion | 2.61 – 3.69 au |
| Eccentricity | 0.172 |
| Inclination | 21.6° |
| Closest distance between its orbit and Earth's (MOID) | 1.65 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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All asteroids named after someone called Mark