(21654) Telmo Main-belt Asteroid
Discovered on 5 August 1999 by Lopez, A., Pacheco, R. at Costitx.
Named for Telmo Fernández Castro (b. 1960), Director of the Madrid Planetarium; he holds a doctorate in astrophysics from the Universidad Complutense de Madrid, with expertise in symbiotic binary stars. He was co-director of the award-winning planetarium production Black Holes: Unknown Horizons. He is also an accomplished classical Spanish guitarist.Naming citation (WGSBN Bull. 6, #16, 7), IAU / Minor Planet Center, via NASA/JPL
Where Telmo is today
Seen from above the solar system on 2026-10-14: Telmo is 2.53 au from the Sun and 3.52 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21654 |
| Provisional designation | 1999 PZ |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 14.58 |
| Orbital period | 3.50 years |
| Semi-major axis | 2.31 au |
| Perihelion – aphelion | 1.76 – 2.86 au |
| Eccentricity | 0.239 |
| Inclination | 7.25° |
| Closest distance between its orbit and Earth's (MOID) | 0.745 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.