(21499) Perillat Main-belt Asteroid
Discovered on 22 May 1998 by LONEOS at Anderson Mesa.
Phil Perillat (b. 1952), senior software specialist at the Arecibo Observatory, has written the primary data-acquisition programs for radar observations of minor planets and other solar system targets during the past several decades.Naming citation (20080718/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Perillat is today
Seen from above the solar system on 2026-10-14: Perillat is 2.19 au from the Sun and 1.43 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21499 |
| Provisional designation | 1998 KS4 |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.18 km (#12,302 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.253 |
| Rotation period | 300 hours |
| Absolute magnitude (H) | 14.32 |
| Orbital period | 3.83 years |
| Semi-major axis | 2.45 au |
| Perihelion – aphelion | 2.15 – 2.75 au |
| Eccentricity | 0.122 |
| Inclination | 8.00° |
| Closest distance between its orbit and Earth's (MOID) | 1.16 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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