(36039) Joandunham Main-belt Asteroid
Discovered on 13 August 1999 by J. Broughton at Reedy Creek.
Joan Dunham (b. 1944) has a PhD in aerospace engineering and is the Secretary/Treasurer of the International Occultation Timing Association. She has been active in the field since 1966 when she began observing and analyzing occultations at the US Naval Observatory. This work continued during subsequent employment with NASA contractors and into retirement.Naming citation (WGSBN Bull. 2, #12, 13), IAU / Minor Planet Center, via NASA/JPL
Where Joandunham is today
Seen from above the solar system on 2026-10-14: Joandunham is 2.87 au from the Sun and 2.25 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 36039 |
| Provisional designation | 1999 PA4 |
| Orbit class | Main-belt Asteroid |
| Diameter | 8.95 km (#5,794 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0460 |
| Absolute magnitude (H) | 13.72 |
| Orbital period | 5.45 years |
| Semi-major axis | 3.10 au |
| Perihelion – aphelion | 2.83 – 3.37 au |
| Eccentricity | 0.0874 |
| Inclination | 6.16° |
| Closest distance between its orbit and Earth's (MOID) | 1.82 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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All asteroids named after someone called Joan