(281507) Johnellen Main-belt Asteroid
Discovered on 7 October 2008 by D. McDonald at Celbridge.
Named for the parents of the discoverer, John and Ellen McDonald, for their inspiration and encouragement of his interest in astronomy.Naming citation (MPC batch dated 2019-05-18), IAU / Minor Planet Center, via NASA/JPL
Where Johnellen is today
Seen from above the solar system on 2026-10-14: Johnellen is 2.51 au from the Sun and 2.66 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 281507 |
| Provisional designation | 2008 TM9 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 16.12 |
| Orbital period | 4.20 years |
| Semi-major axis | 2.60 au |
| Perihelion – aphelion | 2.44 – 2.77 au |
| Eccentricity | 0.0646 |
| Inclination | 13.9° |
| Closest distance between its orbit and Earth's (MOID) | 1.45 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.