(20439) Junghyunjo Main-belt Asteroid
Discovered on 10 May 1999 by LINEAR at Socorro.
Jung Hyun Jo (b. 1964) is a Korean researcher at the Korea Astronomy and Space Science Institute. He participated in the Near Space Optical Survey to discover potentially-hazardous asteroids from the southern hemisphere, and he is also involved in the OWL-Net (Optical Wide-field Patrol Network) project, which uses a global network of automated telescopes.Naming citation (WGSBN Bull. 6, #11, 20), IAU / Minor Planet Center, via NASA/JPL
Where Junghyunjo is today
Seen from above the solar system on 2026-10-14: Junghyunjo is 2.37 au from the Sun and 1.95 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 20439 |
| Provisional designation | 1999 JM28 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.51 km (#11,603 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.345 |
| Rotation period | 9.09 hours |
| Absolute magnitude (H) | 14.19 |
| Orbital period | 3.72 years |
| Semi-major axis | 2.40 au |
| Perihelion – aphelion | 1.94 – 2.87 au |
| Eccentricity | 0.193 |
| Inclination | 1.39° |
| Closest distance between its orbit and Earth's (MOID) | 0.950 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 10 May 1999
- (11219) Benbohn
- (11225) Borden
- (11227) Ksenborisova
- (11228) Botnick
- (11229) Brookebowers
- (11230) Deschaffer
- (11231) Schiavo
- (11413) Catanach
- (11414) Allanchu
- (12117) Meagmessina
- (16048) Eddiedai
- (16049) D'Amore