(15448) Siegwarth Main-belt Asteroid
Discovered on 10 December 1998 by Spacewatch at Kitt Peak.
James David Siegwarth (b. 1934), a physicist at the National Institute of Standards and Technology in Boulder, devoted 37 years to cryogenics and dilution refrigeration research. In retirement, his scientific work continues, including the discovery of a new species of dinosaur, Drinker nisti.Naming citation (WGSBN Bull. 3, #12, 7), IAU / Minor Planet Center, via NASA/JPL
Where Siegwarth is today
Seen from above the solar system on 2026-10-14: Siegwarth is 2.66 au from the Sun and 3.41 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 15448 |
| Provisional designation | 1998 XT21 |
| Orbit class | Main-belt Asteroid |
| Diameter | 7.63 km (#6,968 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0700 |
| Absolute magnitude (H) | 14.35 |
| Orbital period | 4.36 years |
| Semi-major axis | 2.67 au |
| Perihelion – aphelion | 2.63 – 2.71 au |
| Eccentricity | 0.0147 |
| Inclination | 2.53° |
| Closest distance between its orbit and Earth's (MOID) | 1.63 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
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