(31531) ARRL Main-belt Asteroid
Discovered on 9 February 1999 by Spacewatch at Kitt Peak.
Since 1914, the American Radio Relay League has been the largest membership organization of radio amateurs in the U.S. ARRL promotes interest in “ham” radio and experimentation, maintains high standards of conduct and fraternalism among hams and represents their interests in matters legislative.Naming citation (20100726/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where ARRL is today
Seen from above the solar system on 2026-10-14: ARRL is 2.85 au from the Sun and 1.86 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 31531 |
| Provisional designation | 1999 CQ137 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 14.77 |
| Orbital period | 4.95 years |
| Semi-major axis | 2.90 au |
| Perihelion – aphelion | 2.66 – 3.14 au |
| Eccentricity | 0.0828 |
| Inclination | 2.43° |
| Closest distance between its orbit and Earth's (MOID) | 1.65 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.