(128523) Johnmuir Main-belt Asteroid
Discovered on 11 August 2004 by R. E. Jones at Francisquito.
John Muir (1838-1914), a Scottish-born Californian pioneer explorer, glaciologist and conservationist, is acknowledged as the primary architect of the National Park concept used worldwide to protect and preserve wild places, and he was one of the founders of the worldwide conservation organization known as the Sierra Club.Naming citation (20060613/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Johnmuir is today
Seen from above the solar system on 2026-10-14: Johnmuir is 2.08 au from the Sun and 1.89 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 128523 |
| Provisional designation | 2004 PX42 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 17.17 |
| Orbital period | 3.73 years |
| Semi-major axis | 2.41 au |
| Perihelion – aphelion | 1.91 – 2.90 au |
| Eccentricity | 0.205 |
| Inclination | 1.33° |
| Closest distance between its orbit and Earth's (MOID) | 0.914 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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