(20427) Hjalmar Main-belt Asteroid
Discovered on 13 November 1998 by C.-I. Lagerkvist at La Silla.
Hjalmar Lagerkvist (b. 2021) is a grandson of the discoverer.Naming citation (WGSBN Bull. 2, #13, 6), IAU / Minor Planet Center, via NASA/JPL
Where Hjalmar is today
Seen from above the solar system on 2026-10-14: Hjalmar is 2.83 au from the Sun and 1.95 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 20427 |
| Provisional designation | 1998 VX44 |
| Orbit class | Main-belt Asteroid |
| Diameter | 17.9 km (#2,508 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0660 |
| Absolute magnitude (H) | 12.61 |
| Orbital period | 5.56 years |
| Semi-major axis | 3.14 au |
| Perihelion – aphelion | 2.82 – 3.46 au |
| Eccentricity | 0.102 |
| Inclination | 24.0° |
| Closest distance between its orbit and Earth's (MOID) | 1.87 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.