(21458) Susank Main-belt Asteroid
Discovered on 25 April 1998 by LONEOS at Anderson Mesa.
Susan D. Benecchi (née Kern; b. 1977) is currently a postdoctoral researcher at the Space Telescope Science Institute, Baltimore. She specializes in binary transneptunian objects and has a strong interest in science education.Naming citation (20080718/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Susank is today
Seen from above the solar system on 2026-10-14: Susank is 2.40 au from the Sun and 3.36 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21458 |
| Provisional designation | 1998 HN51 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.24 km (#14,630 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.222 |
| Rotation period | 7.29 hours |
| Absolute magnitude (H) | 14.93 |
| Orbital period | 3.55 years |
| Semi-major axis | 2.33 au |
| Perihelion – aphelion | 2.17 – 2.48 au |
| Eccentricity | 0.0669 |
| Inclination | 4.64° |
| Closest distance between its orbit and Earth's (MOID) | 1.19 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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